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Select the incorrect statement.- a)The third member of alkene homologous series is butene.
- b)The mass difference between first and third member of aldehyde homologous series is 28 a.m.u.
- c)Second member of homologous series of ketone is ethanone.
- d)Fifth member of alcohol homologous series is pentyl alcohol and its formula is CH3(CH2)4OH.
Correct answer is option 'B'. Can you explain this answer?
Select the incorrect statement.
a)
The third member of alkene homologous series is butene.
b)
The mass difference between first and third member of aldehyde homologous series is 28 a.m.u.
c)
Second member of homologous series of ketone is ethanone.
d)
Fifth member of alcohol homologous series is pentyl alcohol and its formula is CH3(CH2)4OH.
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Nk Classes answered |
The correct statement is that the mass difference between the first and third member of the aldehyde homologous series is 14 a.m.u. (e.g., methanal to propanal).
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
Sound is a type of (i) wave that travels through a medium. It cannot travel through a (ii) . The (iii) of a sound wave determines its pitch, and the (iv) of the wave determines its loudness. The speed of sound is fastest in (v) .
(i) (ii) (iii) (iv) (v)- a)Longitudinal Vacuum Frequency Amplitude Solids
- b)Transverse Vacuum Amplitude Frequency Liquids
- c)Longitudinal Medium Amplitude Frequency Solids
- d)Transverse Medium Frequency Amplitude Gases
Correct answer is option 'A'. Can you explain this answer?
Sound is a type of (i) wave that travels through a medium. It cannot travel through a (ii) . The (iii) of a sound wave determines its pitch, and the (iv) of the wave determines its loudness. The speed of sound is fastest in (v) .
(i) (ii) (iii) (iv) (v)
a)
Longitudinal Vacuum Frequency Amplitude Solids
b)
Transverse Vacuum Amplitude Frequency Liquids
c)
Longitudinal Medium Amplitude Frequency Solids
d)
Transverse Medium Frequency Amplitude Gases
|
Radha sengupta answered |
Explanation:
Sound Wave Characteristics:
- Sound is a type of longitudinal wave that travels through a medium.
- It cannot travel through a vacuum, as it requires a medium to propagate.
- The frequency of a sound wave determines its pitch, where higher frequencies produce higher pitches.
- The amplitude of the wave determines its loudness, with larger amplitudes producing louder sounds.
- The speed of sound is fastest in solids due to the closely packed particles that allow for faster transmission of the wave.
Therefore, the correct option is:
(i) Longitudinal
(ii) Vacuum
(iii) Frequency
(iv) Amplitude
(v) Solids
This explanation breaks down the characteristics of sound waves and clarifies why each option is the most suitable choice for filling in the blanks.
Sound Wave Characteristics:
- Sound is a type of longitudinal wave that travels through a medium.
- It cannot travel through a vacuum, as it requires a medium to propagate.
- The frequency of a sound wave determines its pitch, where higher frequencies produce higher pitches.
- The amplitude of the wave determines its loudness, with larger amplitudes producing louder sounds.
- The speed of sound is fastest in solids due to the closely packed particles that allow for faster transmission of the wave.
Therefore, the correct option is:
(i) Longitudinal
(ii) Vacuum
(iii) Frequency
(iv) Amplitude
(v) Solids
This explanation breaks down the characteristics of sound waves and clarifies why each option is the most suitable choice for filling in the blanks.
A mineral ‘W’ with the formula NaCl is commonly used in cooking.
Compound (W) contains- a)One Na–Cl single bond
- b)Ionic bonds between Na+ and Cl-
- c)Covalent bonds between Na and Cl
- d)Metallic bonds between Na and Cl
Correct answer is option 'B'. Can you explain this answer?
A mineral ‘W’ with the formula NaCl is commonly used in cooking.
Compound (W) contains
Compound (W) contains
a)
One Na–Cl single bond
b)
Ionic bonds between Na+ and Cl-
c)
Covalent bonds between Na and Cl
d)
Metallic bonds between Na and Cl
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Ishita Kumar answered |
Explanation:
NaCl Compound:
- The compound 'W' mentioned in the question with the formula NaCl is sodium chloride, commonly known as table salt.
Bonding in NaCl:
- Sodium chloride (NaCl) is an ionic compound.
- It is formed when sodium (Na) atoms lose an electron to form Na+ ions, and chlorine (Cl) atoms gain an electron to form Cl- ions.
- The attraction between these positively charged sodium ions and negatively charged chloride ions results in the formation of ionic bonds.
Characteristics of Ionic Bonds:
- Ionic bonds are formed between a metal (sodium) and a non-metal (chlorine).
- These bonds are formed through the transfer of electrons from one atom to another, resulting in the formation of ions.
- Ionic bonds are strong electrostatic attractions between oppositely charged ions.
Usage in Cooking:
- Sodium chloride (NaCl) is commonly used in cooking as a seasoning and flavor enhancer.
- It helps to enhance the taste of food by adding a salty flavor.
Conclusion:
- In conclusion, compound 'W' with the formula NaCl contains ionic bonds between sodium and chlorine atoms. These bonds are responsible for the formation of sodium chloride, which is widely used in cooking for its flavor-enhancing properties.
NaCl Compound:
- The compound 'W' mentioned in the question with the formula NaCl is sodium chloride, commonly known as table salt.
Bonding in NaCl:
- Sodium chloride (NaCl) is an ionic compound.
- It is formed when sodium (Na) atoms lose an electron to form Na+ ions, and chlorine (Cl) atoms gain an electron to form Cl- ions.
- The attraction between these positively charged sodium ions and negatively charged chloride ions results in the formation of ionic bonds.
Characteristics of Ionic Bonds:
- Ionic bonds are formed between a metal (sodium) and a non-metal (chlorine).
- These bonds are formed through the transfer of electrons from one atom to another, resulting in the formation of ions.
- Ionic bonds are strong electrostatic attractions between oppositely charged ions.
Usage in Cooking:
- Sodium chloride (NaCl) is commonly used in cooking as a seasoning and flavor enhancer.
- It helps to enhance the taste of food by adding a salty flavor.
Conclusion:
- In conclusion, compound 'W' with the formula NaCl contains ionic bonds between sodium and chlorine atoms. These bonds are responsible for the formation of sodium chloride, which is widely used in cooking for its flavor-enhancing properties.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In an electric circuit, the (i) is the component that provides energy to the circuit. The (ii) is the component that uses electrical energy to do work. (iii) is used to control the flow of current. (iv) provides a path for the current to flow. If there is a break in the (v) , the circuit will not work.- a)Resistor Bulb Switch Wire Resistor
- b)Battery Bulb Switch Wire Wire
- c)Bulb Switch Wire Battery Battery
- d)Switch Battery Wire Bulb Switch
Correct answer is option 'B'. Can you explain this answer?
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In an electric circuit, the (i) is the component that provides energy to the circuit. The (ii) is the component that uses electrical energy to do work. (iii) is used to control the flow of current. (iv) provides a path for the current to flow. If there is a break in the (v) , the circuit will not work.
In an electric circuit, the (i) is the component that provides energy to the circuit. The (ii) is the component that uses electrical energy to do work. (iii) is used to control the flow of current. (iv) provides a path for the current to flow. If there is a break in the (v) , the circuit will not work.
a)
Resistor Bulb Switch Wire Resistor
b)
Battery Bulb Switch Wire Wire
c)
Bulb Switch Wire Battery Battery
d)
Switch Battery Wire Bulb Switch
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Kamna Science Academy answered |
The battery provides energy, the bulb uses electrical energy, the switch controls current flow, wires provide a path, and a break in the wire means the circuit won't work.
An alcohol ‘D’ with the formula C2H5OH is often used as a solvent.
Compound (D) contains- a)One C–C single bond and one O–H single bond
- b)One C=O double bond and three C–H single bonds
- c)Two C=O double bonds and no C–C single bonds
- d)One C≡C triple bond and one O–H single bond
Correct answer is option 'A'. Can you explain this answer?
An alcohol ‘D’ with the formula C2H5OH is often used as a solvent.
Compound (D) contains
Compound (D) contains
a)
One C–C single bond and one O–H single bond
b)
One C=O double bond and three C–H single bonds
c)
Two C=O double bonds and no C–C single bonds
d)
One C≡C triple bond and one O–H single bond
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EduRev Class 10 answered |
Ethanol (C2H5OH) has one C–C single bond and one O–H single bond in its structure.
Select the incorrect statement.- a)The nucleus of an atom contains protons and neutrons.
- b)Electrons orbit the nucleus in fixed, circular paths.
- c)Isotopes of an element have the same number of protons but different numbers of neutrons.
- d)The atomic number of an element is equal to the number of protons in its nucleus.
Correct answer is option 'B'. Can you explain this answer?
a)
The nucleus of an atom contains protons and neutrons.
b)
Electrons orbit the nucleus in fixed, circular paths.
c)
Isotopes of an element have the same number of protons but different numbers of neutrons.
d)
The atomic number of an element is equal to the number of protons in its nucleus.
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Riddhi patil answered |
Incorrect Statement Explanation:
Electrons orbit the nucleus in fixed, circular paths
- Electrons do not orbit the nucleus in fixed, circular paths as depicted in the Bohr model.
- In reality, electrons exist in regions around the nucleus called electron clouds or orbitals.
- These orbitals represent the probability of finding an electron at a particular location.
- The exact path or trajectory of an electron cannot be precisely determined due to the uncertainty principle in quantum mechanics.
Therefore, option B is incorrect because electrons do not orbit the nucleus in fixed, circular paths.
Electrons orbit the nucleus in fixed, circular paths
- Electrons do not orbit the nucleus in fixed, circular paths as depicted in the Bohr model.
- In reality, electrons exist in regions around the nucleus called electron clouds or orbitals.
- These orbitals represent the probability of finding an electron at a particular location.
- The exact path or trajectory of an electron cannot be precisely determined due to the uncertainty principle in quantum mechanics.
Therefore, option B is incorrect because electrons do not orbit the nucleus in fixed, circular paths.
Which of the following statements about acids and bases is/are correct?
I. Acids have a pH less than 7.
II. Bases have a pH greater than 7.
III. Neutral solutions have a pH of 7.
IV. Acids turn blue litmus paper red.- a)I and III only
- b)II and IV only
- c)I, II, and III only
- d)I, II, III, and IV
Correct answer is option 'D'. Can you explain this answer?
I. Acids have a pH less than 7.
II. Bases have a pH greater than 7.
III. Neutral solutions have a pH of 7.
IV. Acids turn blue litmus paper red.
a)
I and III only
b)
II and IV only
c)
I, II, and III only
d)
I, II, III, and IV
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Akshara Basu answered |
Explanation:
Acids and Bases
- Acids have a pH less than 7, indicating that they are acidic in nature.
- Bases have a pH greater than 7, indicating that they are basic in nature.
- Neutral solutions have a pH of 7, which means they are neither acidic nor basic.
- Acids turn blue litmus paper red, which is a common test to distinguish between acids and bases.
Therefore, all the statements provided in the question are correct.
- Statement I: Acids have a pH less than 7 (True)
- Statement II: Bases have a pH greater than 7 (True)
- Statement III: Neutral solutions have a pH of 7 (True)
- Statement IV: Acids turn blue litmus paper red (True)
Acids and Bases
- Acids have a pH less than 7, indicating that they are acidic in nature.
- Bases have a pH greater than 7, indicating that they are basic in nature.
- Neutral solutions have a pH of 7, which means they are neither acidic nor basic.
- Acids turn blue litmus paper red, which is a common test to distinguish between acids and bases.
Therefore, all the statements provided in the question are correct.
- Statement I: Acids have a pH less than 7 (True)
- Statement II: Bases have a pH greater than 7 (True)
- Statement III: Neutral solutions have a pH of 7 (True)
- Statement IV: Acids turn blue litmus paper red (True)
Select the incorrect statement.- a)Fungi are organisms that can be unicellular or multicellular.
- b)Bacteria are prokaryotic organisms that lack a nucleus.
- c)Viruses are considered living organisms because they can replicate and evolve.
- d)Protozoa are single-celled eukaryotic organisms.
Correct answer is option 'C'. Can you explain this answer?
a)
Fungi are organisms that can be unicellular or multicellular.
b)
Bacteria are prokaryotic organisms that lack a nucleus.
c)
Viruses are considered living organisms because they can replicate and evolve.
d)
Protozoa are single-celled eukaryotic organisms.
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Kamna Science Academy answered |
Viruses are not considered living organisms because they cannot carry out metabolic processes on their own and require a host cell to replicate.
Select the incorrect statement.- a)The boiling point of water is 100°C at standard atmospheric pressure.
- b)Ice has a lower density than water.
- c)Water molecules are composed of two hydrogen atoms and one oxygen atom.
- d)Water is an example of a nonpolar molecule.
Correct answer is option 'D'. Can you explain this answer?
a)
The boiling point of water is 100°C at standard atmospheric pressure.
b)
Ice has a lower density than water.
c)
Water molecules are composed of two hydrogen atoms and one oxygen atom.
d)
Water is an example of a nonpolar molecule.
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EduRev Class 10 answered |
Water is a polar molecule due to its asymmetrical shape and unequal sharing of electrons between hydrogen and oxygen.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In the respiratory system, the (i) is the organ where gas exchange occurs. Air enters through the (ii) , passes through the (iii) , and reaches the (iv) before finally entering the (v) where oxygen is exchanged for carbon dioxide.
(i) (ii) (iii) (iv) (v)- a)Lungs Nose Bronchioles Trachea Alveoli
- b)Alveoli Mouth Bronchi Trachea Lungs
- c)Alveoli Nose Trachea Bronchioles Lungs
- d)Lungs Mouth Trachea Bronchi Alveoli
Correct answer is option 'D'. Can you explain this answer?
In the respiratory system, the (i) is the organ where gas exchange occurs. Air enters through the (ii) , passes through the (iii) , and reaches the (iv) before finally entering the (v) where oxygen is exchanged for carbon dioxide.
(i) (ii) (iii) (iv) (v)
a)
Lungs Nose Bronchioles Trachea Alveoli
b)
Alveoli Mouth Bronchi Trachea Lungs
c)
Alveoli Nose Trachea Bronchioles Lungs
d)
Lungs Mouth Trachea Bronchi Alveoli
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Nk Classes answered |
Air enters through the mouth/nose, passes through the trachea, into the bronchi, and bronchioles, finally reaching the alveoli in the lungs for gas exchange.
Read the given paragraph about genetics and select the incorrect statement regarding it.
Genetics is the branch of biology that studies genes, heredity, and genetic variation in living organisms. Genes are segments of DNA that encode specific traits or proteins. In sexual reproduction, offspring inherit genetic material from both parents, leading to genetic diversity. Genetic engineering allows scientists to modify DNA for various purposes, such as improving crop yields or treating genetic disorders.- a)Genetics studies genes, heredity, and genetic variation.
- b)Genes are segments of RNA that encode specific traits or proteins.
- c)Offspring inherit genetic material from both parents in sexual reproduction.
- d)Genetic engineering allows scientists to modify DNOption A:
Correct answer is option 'B'. Can you explain this answer?
Genetics is the branch of biology that studies genes, heredity, and genetic variation in living organisms. Genes are segments of DNA that encode specific traits or proteins. In sexual reproduction, offspring inherit genetic material from both parents, leading to genetic diversity. Genetic engineering allows scientists to modify DNA for various purposes, such as improving crop yields or treating genetic disorders.
a)
Genetics studies genes, heredity, and genetic variation.
b)
Genes are segments of RNA that encode specific traits or proteins.
c)
Offspring inherit genetic material from both parents in sexual reproduction.
d)
Genetic engineering allows scientists to modify DNOption A:
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Nk Classes answered |
Genes are segments of RNA that encode specific traits or proteins is incorrect because genes are segments of DNA, not RNA
Read the following paragraph about evolution and select the incorrect statement regarding it.
Evolution is the process by which species change over time through natural selection, mutation, and genetic drift. Charles Darwin proposed the theory of evolution by natural selection, which explains how species adapt to their environments over generations. Fossil records provide evidence of evolutionary changes over millions of years. Evolution is driven solely by genetic mutations.- a)Evolution is the process by which species change over time.
- b)Charles Darwin proposed the theory of evolution by natural selection.
- c)Fossil records provide evidence of evolutionary changes.
- d)Evolution is driven solely by genetic mutations and natural selection.
Correct answer is option 'D'. Can you explain this answer?
Evolution is the process by which species change over time through natural selection, mutation, and genetic drift. Charles Darwin proposed the theory of evolution by natural selection, which explains how species adapt to their environments over generations. Fossil records provide evidence of evolutionary changes over millions of years. Evolution is driven solely by genetic mutations.
a)
Evolution is the process by which species change over time.
b)
Charles Darwin proposed the theory of evolution by natural selection.
c)
Fossil records provide evidence of evolutionary changes.
d)
Evolution is driven solely by genetic mutations and natural selection.
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Kamna Science Academy answered |
Evolution is driven solely by genetic mutations is incorrect because evolution is driven by various factors including natural selection, mutation, and genetic drift.
A sugar molecule ‘B’ with the formula C6H12O6 is a primary energy source for cells.
Compound (B) contains- a)Only C–C single bonds
- b)C–C single bonds and C=O double bonds
- c)Only C=O double bonds
- d)Only C≡C triple bonds
Correct answer is option 'B'. Can you explain this answer?
A sugar molecule ‘B’ with the formula C6H12O6 is a primary energy source for cells.
Compound (B) contains
Compound (B) contains
a)
Only C–C single bonds
b)
C–C single bonds and C=O double bonds
c)
Only C=O double bonds
d)
Only C≡C triple bonds
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Kamna Science Academy answered |
Glucose (C6H12O6) has C–C single bonds and a C=O double bond in its structure.
A diatomic gas ‘E’ with the formula O2 is essential for respiration.
Compound (E) contains- a)One O–O single bond
- b)One O=O double bond
- c)Two O–O single bonds
- d)Two O=O double bonds
Correct answer is option 'B'. Can you explain this answer?
A diatomic gas ‘E’ with the formula O2 is essential for respiration.
Compound (E) contains
Compound (E) contains
a)
One O–O single bond
b)
One O=O double bond
c)
Two O–O single bonds
d)
Two O=O double bonds
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Kamna Science Academy answered |
Oxygen gas (O2) has one O=O double bond in its diatomic molecular form.
Read the following paragraph about matter and select the incorrect statement regarding it.
Matter is anything that has mass and occupies space. It exists in three states: solid, liquid, and gas. Solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases have neither a definite shape nor volume. Matter undergoes physical and chemical changes, such as melting, freezing, and reacting with other substances.- a)Matter is anything that has mass and occupies space.
- b)Solids have a definite shape and volume.
- c)Gases have a definite shape and volume.
- d)Matter undergoes physical and chemical changes.
Correct answer is option 'C'. Can you explain this answer?
Matter is anything that has mass and occupies space. It exists in three states: solid, liquid, and gas. Solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases have neither a definite shape nor volume. Matter undergoes physical and chemical changes, such as melting, freezing, and reacting with other substances.
a)
Matter is anything that has mass and occupies space.
b)
Solids have a definite shape and volume.
c)
Gases have a definite shape and volume.
d)
Matter undergoes physical and chemical changes.
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EduRev Class 10 answered |
Gases have a definite shape and volume is incorrect because gases have neither a definite shape nor volume.
A molecule ‘C’ with the formula CH4 is a simple hydrocarbon.
Compound (C) contains- a)Four C–H single bonds
- b)Two C–H single bonds and two C=C double bonds
- c)Three C–H single bonds and one C=O double bond
- d)One C–H single bond and three C≡C triple bonds
Correct answer is option 'A'. Can you explain this answer?
A molecule ‘C’ with the formula CH4 is a simple hydrocarbon.
Compound (C) contains
Compound (C) contains
a)
Four C–H single bonds
b)
Two C–H single bonds and two C=C double bonds
c)
Three C–H single bonds and one C=O double bond
d)
One C–H single bond and three C≡C triple bonds
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Kamna Science Academy answered |
Methane (CH4) has four C–H single bonds in its tetrahedral structure.
Which of the following statements regarding the periodic table is/are correct?
I. Elements in the same group have similar chemical properties.
II. Elements in the same period have the same number of electron shells.
III. Metals are located on the left side of the periodic table.
IV. Nonmetals are located on the right side of the periodic table.- a)I and III only
- b)I, II, and IV only
- c)II and III only
- d)I, II, III, and IV
Correct answer is option 'D'. Can you explain this answer?
I. Elements in the same group have similar chemical properties.
II. Elements in the same period have the same number of electron shells.
III. Metals are located on the left side of the periodic table.
IV. Nonmetals are located on the right side of the periodic table.
a)
I and III only
b)
I, II, and IV only
c)
II and III only
d)
I, II, III, and IV
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EduRev Class 10 answered |
All the given statements are correct. Elements in the same group have similar chemical properties, elements in the same period have the same number of electron shells, metals are located on the left side, and nonmetals on the right side of the periodic table.
Select the incorrect statement.- a)Genes are segments of DNA that encode specific proteins.
- b)Meiosis is a process that produces haploid gametes from diploid cells.
- c)Evolution is a gradual process of change and adaptation of species over generations.
- d)Fungi and plants are classified under the kingdom Animalia.
Correct answer is option 'D'. Can you explain this answer?
a)
Genes are segments of DNA that encode specific proteins.
b)
Meiosis is a process that produces haploid gametes from diploid cells.
c)
Evolution is a gradual process of change and adaptation of species over generations.
d)
Fungi and plants are classified under the kingdom Animalia.
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Nk Classes answered |
Fungi and plants belong to separate kingdoms: Fungi are classified in the kingdom Fungi, and plants are classified in the kingdom Plantae.
Which of the following statements regarding states of matter is/are correct?
I. Solids have a definite shape and volume.
II. Liquids have a definite volume but no definite shape.
III. Gases have neither definite shape nor definite volume.
IV. Plasma is a state of matter similar to gases but with charged particles.- a)I and II only
- b)III and IV only
- c)I, II, and III only
- d)I, II, III, and IV
Correct answer is option 'D'. Can you explain this answer?
I. Solids have a definite shape and volume.
II. Liquids have a definite volume but no definite shape.
III. Gases have neither definite shape nor definite volume.
IV. Plasma is a state of matter similar to gases but with charged particles.
a)
I and II only
b)
III and IV only
c)
I, II, and III only
d)
I, II, III, and IV
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Nk Classes answered |
All the given statements are correct. Solids have a definite shape and volume, liquids have a definite volume but no definite shape, gases have neither definite shape nor volume, and plasma is a state of matter with charged particles similar to gases.
Which one of the following hormones regulates the amount of glucose in the blood?
I. Adrenaline
II. Thyroxine
III. Insulin
IV. Estrogen- a)I only
- b)II only
- c)III only
- d)IV only
Correct answer is option 'C'. Can you explain this answer?
I. Adrenaline
II. Thyroxine
III. Insulin
IV. Estrogen
a)
I only
b)
II only
c)
III only
d)
IV only
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Nk Classes answered |
Insulin is a hormone produced by the pancreas that helps regulate blood glucose levels by facilitating the uptake of glucose into cells.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
The human digestive system consists of several organs. The (i) produces bile, which is stored in the (ii) . The bile helps in the digestion of (iii) in the (iv) . The undigested food is then passed into the (v) .
(i) (ii) (iii) (iv) (v)- a)Stomach Gallbladder Proteins Large intestine Small intestine
- b)Pancreas Liver Carbohydrates Small intestine Large intestine
- c)Liver Gallbladder Fats Small intestine Large intestine
- d)Small intestine Stomach Carbohydrates Large intestine Rectum
Correct answer is option 'C'. Can you explain this answer?
The human digestive system consists of several organs. The (i) produces bile, which is stored in the (ii) . The bile helps in the digestion of (iii) in the (iv) . The undigested food is then passed into the (v) .
(i) (ii) (iii) (iv) (v)
a)
Stomach Gallbladder Proteins Large intestine Small intestine
b)
Pancreas Liver Carbohydrates Small intestine Large intestine
c)
Liver Gallbladder Fats Small intestine Large intestine
d)
Small intestine Stomach Carbohydrates Large intestine Rectum
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Kamna Science Academy answered |
The liver produces bile which is stored in the gallbladder. Bile aids in the digestion of fats in the small intestine, with undigested food passing into the large intestine.
Read the given paragraph about photosynthesis and select the incorrect statement regarding it.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose molecules. It occurs in chloroplasts, organelles containing the pigment chlorophyll. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen. This process is essential for maintaining the oxygen levels in the atmosphere.- a)Photosynthesis converts light energy into chemical energy stored in glucose molecules.
- b)Chloroplasts contain the pigment chlorophyll.
- c)Photosynthesis produces glucose and oxygen.
- d)Photosynthesis is essential for maintaining nitrogen levels in the atmosphere.
Correct answer is option 'D'. Can you explain this answer?
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose molecules. It occurs in chloroplasts, organelles containing the pigment chlorophyll. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen. This process is essential for maintaining the oxygen levels in the atmosphere.
a)
Photosynthesis converts light energy into chemical energy stored in glucose molecules.
b)
Chloroplasts contain the pigment chlorophyll.
c)
Photosynthesis produces glucose and oxygen.
d)
Photosynthesis is essential for maintaining nitrogen levels in the atmosphere.
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Kamna Science Academy answered |
Photosynthesis is essential for maintaining nitrogen levels in the atmosphere is incorrect because photosynthesis primarily maintains oxygen levels, not nitrogen.
Read the following paragraph about electricity and select the incorrect statement regarding it.
Electricity is the flow of electric charge through conductors such as metals or electrolytes. It can be generated by moving a magnet through a coil of wire or through chemical reactions in batteries. Electric current is measured in amperes (A), and voltage is measured in volts (V). Electrical resistance opposes the flow of current in conductors.- a)Electricity is the flow of electric charge through conductors.
- b)Electric current is measured in amperes (A).
- c)Voltage is measured in volts (V).
- d)Electrical resistance increases the flow of current in conductors.
Correct answer is option 'D'. Can you explain this answer?
Electricity is the flow of electric charge through conductors such as metals or electrolytes. It can be generated by moving a magnet through a coil of wire or through chemical reactions in batteries. Electric current is measured in amperes (A), and voltage is measured in volts (V). Electrical resistance opposes the flow of current in conductors.
a)
Electricity is the flow of electric charge through conductors.
b)
Electric current is measured in amperes (A).
c)
Voltage is measured in volts (V).
d)
Electrical resistance increases the flow of current in conductors.
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Nk Classes answered |
Electrical resistance increases the flow of current in conductors is incorrect because resistance opposes the flow of current.
Read the given paragraph about sound and select the incorrect statement regarding it.
Sound is a form of energy produced by vibrations that travel through a medium, such as air, water, or solids. The frequency of sound waves determines their pitch, with higher frequencies corresponding to higher pitches. Sound waves with higher amplitudes are perceived as louder. Doppler effect describes the change in frequency of sound waves due to the relative motion between the source and the observer.- a)Sound is a form of energy produced by vibrations.
- b)The frequency of sound waves determines their pitch.
- c)Sound waves with higher amplitudes are perceived as softer.
- d)Doppler effect describes the change in frequency of sound waves.
Correct answer is option 'C'. Can you explain this answer?
Sound is a form of energy produced by vibrations that travel through a medium, such as air, water, or solids. The frequency of sound waves determines their pitch, with higher frequencies corresponding to higher pitches. Sound waves with higher amplitudes are perceived as louder. Doppler effect describes the change in frequency of sound waves due to the relative motion between the source and the observer.
a)
Sound is a form of energy produced by vibrations.
b)
The frequency of sound waves determines their pitch.
c)
Sound waves with higher amplitudes are perceived as softer.
d)
Doppler effect describes the change in frequency of sound waves.
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Kamna Science Academy answered |
Sound waves with higher amplitudes are perceived as softer is incorrect because higher amplitude sound waves are perceived as louder
Select the incorrect statement.- a)Newton's first law of motion states that an object at rest will remain at rest unless acted upon by an external force.
- b)Acceleration is the rate of change of velocity of an object with respect to time.
- c)Inertia is the tendency of an object to resist a change in its state of motion.
- d)Work done is defined as the product of force and distance moved in the direction of the force.
Correct answer is option 'D'. Can you explain this answer?
a)
Newton's first law of motion states that an object at rest will remain at rest unless acted upon by an external force.
b)
Acceleration is the rate of change of velocity of an object with respect to time.
c)
Inertia is the tendency of an object to resist a change in its state of motion.
d)
Work done is defined as the product of force and distance moved in the direction of the force.
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Kamna Science Academy answered |
Work done is defined as the product of force and displacement (not distance) in the direction of the force.
Read the given paragraph about ecosystems and select the incorrect statement regarding them.
Ecosystems are communities of organisms interacting with their physical environment. They can be terrestrial or aquatic, ranging from deserts to rainforests and oceans. Producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of the food chain. Consumers feed on producers or other consumers, transferring energy through the ecosystem. Ecosystems are stable and unchanging over time.- a)Ecosystems are communities of organisms interacting with their physical environment.
- b)Producers convert sunlight into energy through photosynthesis.
- c)Consumers transfer energy through the ecosystem.
- d)Ecosystems are stable and unchanging over time.
Correct answer is option 'D'. Can you explain this answer?
Ecosystems are communities of organisms interacting with their physical environment. They can be terrestrial or aquatic, ranging from deserts to rainforests and oceans. Producers, such as plants, convert sunlight into energy through photosynthesis, forming the base of the food chain. Consumers feed on producers or other consumers, transferring energy through the ecosystem. Ecosystems are stable and unchanging over time.
a)
Ecosystems are communities of organisms interacting with their physical environment.
b)
Producers convert sunlight into energy through photosynthesis.
c)
Consumers transfer energy through the ecosystem.
d)
Ecosystems are stable and unchanging over time.
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EduRev Class 10 answered |
Ecosystems are stable and unchanging over time is incorrect because ecosystems change over time due to environmental factors and interactions between organisms.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
An atom consists of a nucleus made up of (i) and (ii) . The (iii) revolve around the nucleus in specific orbits. The number of (iv) in an atom determines its element, and the number of (v) determines its isotope.- a)Protons Neutrons Electrons Protons Neutrons
- b)Neutrons Protons Electrons Neutrons Protons
- c)Electrons Neutrons Protons Neutrons Protons
- d)Protons Electrons Neutrons Electrons Protons
Correct answer is option 'A'. Can you explain this answer?
An atom consists of a nucleus made up of (i) and (ii) . The (iii) revolve around the nucleus in specific orbits. The number of (iv) in an atom determines its element, and the number of (v) determines its isotope.
a)
Protons Neutrons Electrons Protons Neutrons
b)
Neutrons Protons Electrons Neutrons Protons
c)
Electrons Neutrons Protons Neutrons Protons
d)
Protons Electrons Neutrons Electrons Protons
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Nk Classes answered |
An atom's nucleus contains protons and neutrons, with electrons orbiting the nucleus. The number of protons determines the element, and the number of neutrons determines the isotope.
A compound ‘Z’ with the formula H2O is essential for all known forms of life.
Compound (Z) contains- a)Two H–O single bonds
- b)One H–O single bond and one O=O double bond
- c)One H–H single bond and one O=O double bond
- d)Two O–H single bonds
Correct answer is option 'D'. Can you explain this answer?
A compound ‘Z’ with the formula H2O is essential for all known forms of life.
Compound (Z) contains
Compound (Z) contains
a)
Two H–O single bonds
b)
One H–O single bond and one O=O double bond
c)
One H–H single bond and one O=O double bond
d)
Two O–H single bonds
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EduRev Class 10 answered |
Water (H2O) has two O–H single bonds in its bent molecular structure.
Which of the following statements regarding the structure of atoms is/are correct?
I. Protons and neutrons are located in the nucleus.
II. Electrons are found in orbitals around the nucleus.
III. The mass of an electron is equal to the mass of a proton.
IV. Neutrons have no charge.- a)I and II only
- b)I, II, and IV only
- c)II and III only
- d)I, III, and IV only
Correct answer is option 'B'. Can you explain this answer?
I. Protons and neutrons are located in the nucleus.
II. Electrons are found in orbitals around the nucleus.
III. The mass of an electron is equal to the mass of a proton.
IV. Neutrons have no charge.
a)
I and II only
b)
I, II, and IV only
c)
II and III only
d)
I, III, and IV only
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Nk Classes answered |
Protons and neutrons are located in the nucleus, electrons are found in orbitals around the nucleus, and neutrons have no charge. The mass of an electron is much smaller than that of a proton.
Read the following paragraph about forces and select the incorrect statement regarding them.
Forces are interactions that cause objects to accelerate or deform. They can be classified as contact forces, such as friction and tension, or non-contact forces, such as gravity and magnetic forces. Newton's laws of motion describe the behavior of forces in relation to the motion of objects. Forces are vector quantities, meaning they have both magnitude and direction.- a)Forces cause objects to accelerate or deform.
- b)Gravity is an example of a non-contact force.
- c)Newton's laws of motion describe the behavior of forces.
- d)Forces are scalar quantities.
Correct answer is option 'D'. Can you explain this answer?
Forces are interactions that cause objects to accelerate or deform. They can be classified as contact forces, such as friction and tension, or non-contact forces, such as gravity and magnetic forces. Newton's laws of motion describe the behavior of forces in relation to the motion of objects. Forces are vector quantities, meaning they have both magnitude and direction.
a)
Forces cause objects to accelerate or deform.
b)
Gravity is an example of a non-contact force.
c)
Newton's laws of motion describe the behavior of forces.
d)
Forces are scalar quantities.
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Kamna Science Academy answered |
Forces are scalar quantities is incorrect because forces are vector quantities as they have both magnitude and direction.
An ester ‘F’ with the formula C4H8O2 is commonly found in fruits.
Compound (F) contains- a)Two C–H single bonds and one C=C double bond
- b)One C–C single bond and one C=O double bond
- c)One C–C single bond and two C=O double bonds
- d)One C=C double bond and one O–H single bond
Correct answer is option 'B'. Can you explain this answer?
An ester ‘F’ with the formula C4H8O2 is commonly found in fruits.
Compound (F) contains
Compound (F) contains
a)
Two C–H single bonds and one C=C double bond
b)
One C–C single bond and one C=O double bond
c)
One C–C single bond and two C=O double bonds
d)
One C=C double bond and one O–H single bond
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Nk Classes answered |
Ethyl acetate (C4H8O2) has one C–C single bond and one C=O double bond in its ester functional group.
Select the incorrect statement.- a)Sound waves require a medium such as air, water, or solids to propagate.
- b)The frequency of a sound wave determines its pitch.
- c)Infrared radiation is part of the electromagnetic spectrum with wavelengths longer than visible light.
- d)Refraction is the bending of light as it passes from one medium to another of different density.
Correct answer is option 'A'. Can you explain this answer?
a)
Sound waves require a medium such as air, water, or solids to propagate.
b)
The frequency of a sound wave determines its pitch.
c)
Infrared radiation is part of the electromagnetic spectrum with wavelengths longer than visible light.
d)
Refraction is the bending of light as it passes from one medium to another of different density.
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Kamna Science Academy answered |
Sound waves do require a medium to propagate, but electromagnetic waves like light can travel through a vacuum.
Read the following paragraph about cells and select the incorrect statement regarding them.
Cells are the basic structural and functional units of living organisms. They can either be eukaryotic or prokaryotic. Eukaryotic cells have a nucleus enclosed within membranes, while prokaryotic cells do not. Cells reproduce through mitosis or meiosis, processes that ensure genetic continuity and diversity.- a)Cells are the basic structural and functional units of living organisms.
- b)Eukaryotic cells have a nucleus enclosed within membranes.
- c)Prokaryotic cells reproduce through mitosis or meiosis.
- d)Mitosis ensures genetic diversity.
Correct answer is option 'D'. Can you explain this answer?
Cells are the basic structural and functional units of living organisms. They can either be eukaryotic or prokaryotic. Eukaryotic cells have a nucleus enclosed within membranes, while prokaryotic cells do not. Cells reproduce through mitosis or meiosis, processes that ensure genetic continuity and diversity.
a)
Cells are the basic structural and functional units of living organisms.
b)
Eukaryotic cells have a nucleus enclosed within membranes.
c)
Prokaryotic cells reproduce through mitosis or meiosis.
d)
Mitosis ensures genetic diversity.
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Nk Classes answered |
Mitosis ensures genetic diversity is incorrect because mitosis ensures genetic continuity, not diversity.
A hydrocarbon ‘A’ with the formula C3H8 is used as a fuel.
Compound (A) contains- a)Three C–H single bonds and two C=C double bonds
- b)Seven C–H single bonds and one C≡C triple bond
- c)Eight C–H single bonds and no multiple bonds
- d)Six C–H single bonds and one C=C double bond
Correct answer is option 'C'. Can you explain this answer?
A hydrocarbon ‘A’ with the formula C3H8 is used as a fuel.
Compound (A) contains
Compound (A) contains
a)
Three C–H single bonds and two C=C double bonds
b)
Seven C–H single bonds and one C≡C triple bond
c)
Eight C–H single bonds and no multiple bonds
d)
Six C–H single bonds and one C=C double bond
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EduRev Class 10 answered |
Propane (C3H8) is an alkane with eight C–H single bonds and no double or triple bonds.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
During the process of (i) , liquid water changes into water vapor. This process occurs more quickly at higher (ii) . The (iii) , on the other hand, is the process by which water vapor changes back into liquid water. This usually happens when the air is (iv) and can no longer hold all the water vapor. Both these processes are part of the (v) cycle.- a)Evaporation Temperature Condensation Warm Water
- b)Condensation Temperature Evaporation Cool Water
- c)Evaporation Humidity Condensation Warm Carbon
- d)Condensation Temperature Evaporation Cool Nitrogen
Correct answer is option 'A'. Can you explain this answer?
During the process of (i) , liquid water changes into water vapor. This process occurs more quickly at higher (ii) . The (iii) , on the other hand, is the process by which water vapor changes back into liquid water. This usually happens when the air is (iv) and can no longer hold all the water vapor. Both these processes are part of the (v) cycle.
a)
Evaporation Temperature Condensation Warm Water
b)
Condensation Temperature Evaporation Cool Water
c)
Evaporation Humidity Condensation Warm Carbon
d)
Condensation Temperature Evaporation Cool Nitrogen
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Nk Classes answered |
Evaporation is the process where liquid water becomes vapor, accelerated by higher temperatures. Condensation is where vapor becomes liquid, often in cooler conditions, both part of the water cycle.
Which of the following equations represents a balanced chemical equation?
I. H2 + O2 → H2O
II. N2 + 3H2 → 2NH3
III. CO2 + H2 → CH4 + O2
IV. Na + Cl2 → NaCl- a)I only
- b)II only
- c)III only
- d)IV only
Correct answer is option 'B'. Can you explain this answer?
Which of the following equations represents a balanced chemical equation?
I. H2 + O2 → H2O
II. N2 + 3H2 → 2NH3
III. CO2 + H2 → CH4 + O2
IV. Na + Cl2 → NaCl
I. H2 + O2 → H2O
II. N2 + 3H2 → 2NH3
III. CO2 + H2 → CH4 + O2
IV. Na + Cl2 → NaCl
a)
I only
b)
II only
c)
III only
d)
IV only
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EduRev Class 10 answered |
A balanced chemical equation has equal numbers of atoms of each element on both sides of the equation. Option B (N2 + 3H2 → 2NH3) is balanced.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In a nuclear reactor, (i) are used to slow down the neutrons. (ii) is used as a fuel. The (iii) controls the rate of the nuclear reaction by absorbing neutrons. The (iv) is used to cool the reactor core and transfer heat. The entire process is enclosed within a (v) .- a)Control rods Uranium Moderator Coolant Reactor vessel
- b)Moderator Uranium Control rods Coolant Reactor vessel
- c)Coolant Plutonium Moderator Control rods Containment building
- d)Moderator Thorium Control rods Coolant Containment building
Correct answer is option 'B'. Can you explain this answer?
In a nuclear reactor, (i) are used to slow down the neutrons. (ii) is used as a fuel. The (iii) controls the rate of the nuclear reaction by absorbing neutrons. The (iv) is used to cool the reactor core and transfer heat. The entire process is enclosed within a (v) .
a)
Control rods Uranium Moderator Coolant Reactor vessel
b)
Moderator Uranium Control rods Coolant Reactor vessel
c)
Coolant Plutonium Moderator Control rods Containment building
d)
Moderator Thorium Control rods Coolant Containment building
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Nk Classes answered |
In a nuclear reactor, the moderator slows down neutrons, uranium is the fuel, control rods absorb neutrons to control the reaction, coolant transfers heat, and the reactor vessel encloses the process.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.In photosynthesis, the plant uses carbon dioxide and water to produce glucose and oxygen. Chlorophyll, which is present in the (i) , captures the energy from (ii) . This energy is then used to convert (iii) and (iv) into glucose. The by-product of this process is (v).- a)Stomata Sunlight Carbon dioxide Water Oxygen
- b)Chloroplasts Sunlight Carbon dioxide Water Oxygen
- c)Stomata Water Oxygen Carbon dioxide Glucose
- d)Chloroplasts Water Carbon dioxide Sunlight Oxygen
Correct answer is option 'B'. Can you explain this answer?
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In photosynthesis, the plant uses carbon dioxide and water to produce glucose and oxygen. Chlorophyll, which is present in the (i) , captures the energy from (ii) . This energy is then used to convert (iii) and (iv) into glucose. The by-product of this process is (v).
a)
Stomata Sunlight Carbon dioxide Water Oxygen
b)
Chloroplasts Sunlight Carbon dioxide Water Oxygen
c)
Stomata Water Oxygen Carbon dioxide Glucose
d)
Chloroplasts Water Carbon dioxide Sunlight Oxygen
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Nk Classes answered |
Chlorophyll in the chloroplasts captures energy from sunlight, which is used to convert carbon dioxide and water into glucose, releasing oxygen as a by-product.
Which of the following processes is an example of a chemical change?
I. Rusting of iron
II. Melting of ice
III. Burning of wood
IV. Boiling of water- a)I and III only
- b)II and IV only
- c)I, II, and III only
- d)III and IV only
Correct answer is option 'A'. Can you explain this answer?
I. Rusting of iron
II. Melting of ice
III. Burning of wood
IV. Boiling of water
a)
I and III only
b)
II and IV only
c)
I, II, and III only
d)
III and IV only
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EduRev Class 10 answered |
Chemical changes result in the formation of new substances. Rusting of iron and burning of wood are chemical changes, while melting of ice and boiling of water are physical changes.
An organic compound ‘X’ having molecular formula, C2H4O2 has melting point 290 K in its purest form and it often freezes during winter in cold climates. Compound (X) contains- a)Two C–H single bonds and one O–H single bond
- b)Two C-O single bonds and one C=O double bond
- c)One C=O double bond and three C–H single bonds
- d)One C–C single bond two C–O single bonds.
Correct answer is option 'B'. Can you explain this answer?
An organic compound ‘X’ having molecular formula, C2H4O2 has melting point 290 K in its purest form and it often freezes during winter in cold climates. Compound (X) contains
a)
Two C–H single bonds and one O–H single bond
b)
Two C-O single bonds and one C=O double bond
c)
One C=O double bond and three C–H single bonds
d)
One C–C single bond two C–O single bonds.
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Kamna Science Academy answered |
The compound with molecular formula C2H4O2 is acetic acid. Its structure is CH3COOH, which includes two C-O single bonds and one C=O double bond.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In the periodic table, elements are arranged in order of increasing (i) . Elements in the same (ii) have similar properties. The (iii) elements are found on the left side of the table, and the (iv) elements are on the right side. The elements in the middle of the table are called (v) .
(i) (ii) (iii) (iv) (v)- a)Atomic number Group Nonmetals Metals Transition metals
- b)Atomic mass Period Nonmetals Metals Metalloids
- c)Atomic number Group Metals Nonmetals Transition metals
- d)Atomic mass Group Metals Nonmetals Alkali metals
Correct answer is option 'C'. Can you explain this answer?
In the periodic table, elements are arranged in order of increasing (i) . Elements in the same (ii) have similar properties. The (iii) elements are found on the left side of the table, and the (iv) elements are on the right side. The elements in the middle of the table are called (v) .
(i) (ii) (iii) (iv) (v)
a)
Atomic number Group Nonmetals Metals Transition metals
b)
Atomic mass Period Nonmetals Metals Metalloids
c)
Atomic number Group Metals Nonmetals Transition metals
d)
Atomic mass Group Metals Nonmetals Alkali metals
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Kamna Science Academy answered |
The periodic table arranges elements by increasing atomic number. Elements in the same group have similar properties, with metals on the left, nonmetals on the right, and transition metals in the middle.
Which of the following statements regarding the cell is/are correct?
I. The nucleus controls the activities of the cell.
II. Mitochondria are the sites of cellular respiration.
III. Ribosomes are involved in protein synthesis.
IV. The cell wall is present in all types of cells.- a)I, II, and III only
- b)I and IV only
- c)II and III only
- d)I, II, III, and IV
Correct answer is option 'A'. Can you explain this answer?
I. The nucleus controls the activities of the cell.
II. Mitochondria are the sites of cellular respiration.
III. Ribosomes are involved in protein synthesis.
IV. The cell wall is present in all types of cells.
a)
I, II, and III only
b)
I and IV only
c)
II and III only
d)
I, II, III, and IV
|
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EduRev Class 10 answered |
The nucleus controls cell activities, mitochondria are the sites of cellular respiration, and ribosomes are involved in protein synthesis. The cell wall is not present in animal cells.
Read the given passage carefully and fill in the blanks by selecting an appropriate option.
In genetics, (i) are the basic units of heredity. They are located on (ii) within the cell nucleus. The (iii) determines the physical characteristics of an organism. During reproduction, (iv) cells combine to form a (v) .
(i) (ii) (iii) (iv) (v)- a)Genes Chromosomes DNA Gamete Zygote
- b)Chromosomes Genes DNA Zygote Gamete
- c)Genes Chromosomes RNA Zygote Gamete
- d)Chromosomes Genes RNA Gamete Zygote
Correct answer is option 'A'. Can you explain this answer?
In genetics, (i) are the basic units of heredity. They are located on (ii) within the cell nucleus. The (iii) determines the physical characteristics of an organism. During reproduction, (iv) cells combine to form a (v) .
(i) (ii) (iii) (iv) (v)
a)
Genes Chromosomes DNA Gamete Zygote
b)
Chromosomes Genes DNA Zygote Gamete
c)
Genes Chromosomes RNA Zygote Gamete
d)
Chromosomes Genes RNA Gamete Zygote
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EduRev Class 10 answered |
Genes are the units of heredity located on chromosomes in the nucleus. DNA determines physical characteristics. Gamete cells combine during reproduction to form a zygote.
A gas ‘Y’ has the molecular formula CO2 and is a major greenhouse gas.
Compound (Y) contains- a)One C–O single bond and one O–O double bond
- b)Two C–O single bonds and no double bond
- c)One C–C single bond and two C–O double bonds
- d)Two C–O double bonds
Correct answer is option 'D'. Can you explain this answer?
A gas ‘Y’ has the molecular formula CO2 and is a major greenhouse gas.
Compound (Y) contains
Compound (Y) contains
a)
One C–O single bond and one O–O double bond
b)
Two C–O single bonds and no double bond
c)
One C–C single bond and two C–O double bonds
d)
Two C–O double bonds
|
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Kamna Science Academy answered |
Carbon dioxide (CO2) has two C=O double bonds in its structure, making it a linear molecule with no single bonds.
Select the incorrect statement.- a)Mitochondria are organelles responsible for cellular respiration.
- b)Chloroplasts are organelles found in plant cells where photosynthesis occurs.
- c)Ribosomes are responsible for protein synthesis in a cell.
- d)Lysosomes are organelles that contain digestive enzymes to break down waste materials.
Correct answer is option 'C'. Can you explain this answer?
a)
Mitochondria are organelles responsible for cellular respiration.
b)
Chloroplasts are organelles found in plant cells where photosynthesis occurs.
c)
Ribosomes are responsible for protein synthesis in a cell.
d)
Lysosomes are organelles that contain digestive enzymes to break down waste materials.
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Nk Classes answered |
Ribosomes are responsible for protein synthesis in both prokaryotic and eukaryotic cells.
Which of the following is a renewable source of energy?
I. Coal
II. Natural Gas
III. Wind
IV. Nuclear- a)I only
- b)II only
- c)III only
- d)IV only
Correct answer is option 'C'. Can you explain this answer?
I. Coal
II. Natural Gas
III. Wind
IV. Nuclear
a)
I only
b)
II only
c)
III only
d)
IV only
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Kamna Science Academy answered |
Wind is a renewable source of energy because it is generated by natural processes that are continually replenished.
Select the incorrect statement.- a)The Earth's atmosphere is primarily composed of nitrogen and oxygen.
- b)The ozone layer is found in the stratosphere and helps protect Earth from ultraviolet radiation.
- c)Carbon dioxide is a greenhouse gas that contributes to global warming.
- d)Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen.
Correct answer is option 'A'. Can you explain this answer?
Select the incorrect statement.
a)
The Earth's atmosphere is primarily composed of nitrogen and oxygen.
b)
The ozone layer is found in the stratosphere and helps protect Earth from ultraviolet radiation.
c)
Carbon dioxide is a greenhouse gas that contributes to global warming.
d)
Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen.
|
|
EduRev Class 10 answered |
The Earth's atmosphere is primarily composed of nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases including argon, carbon dioxide, and neon.
Which of the following elements has the highest electronegativity?
I. Sodium
II. Chlorine
III. Oxygen
IV. Fluorine- a)I only
- b)II only
- c)III only
- d)IV only
Correct answer is option 'D'. Can you explain this answer?
I. Sodium
II. Chlorine
III. Oxygen
IV. Fluorine
a)
I only
b)
II only
c)
III only
d)
IV only
|
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EduRev Class 10 answered |
Electronegativity is the ability of an atom to attract electrons in a chemical bond. Fluorine is the most electronegative element on the periodic table.
Select the incorrect statement.- a)Metals are good conductors of electricity.
- b)Non-metals generally have high melting and boiling points.
- c)Aluminum is a metal that is lightweight and has good strength.
- d)Sodium chloride is an example of an ionic compound.
Correct answer is option 'B'. Can you explain this answer?
a)
Metals are good conductors of electricity.
b)
Non-metals generally have high melting and boiling points.
c)
Aluminum is a metal that is lightweight and has good strength.
d)
Sodium chloride is an example of an ionic compound.
|
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Nk Classes answered |
Non-metals generally have low melting and boiling points compared to metals.
Read the given paragraph about atoms and select the incorrect statement regarding them.
Atoms are the smallest units of matter that retain the properties of an element. They consist of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells. Atoms combine to form molecules through chemical bonds, which can be ionic or covalent. Elements are defined by the number of protons in their atoms.- a)Atoms are the smallest units of matter that retain the properties of an element.
- b)Electrons are found in energy levels or shells around the nucleus.
- c)Atoms combine to form molecules through chemical bonds.
- d)Neutrons have a positive charge.
Correct answer is option 'D'. Can you explain this answer?
Atoms are the smallest units of matter that retain the properties of an element. They consist of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or shells. Atoms combine to form molecules through chemical bonds, which can be ionic or covalent. Elements are defined by the number of protons in their atoms.
a)
Atoms are the smallest units of matter that retain the properties of an element.
b)
Electrons are found in energy levels or shells around the nucleus.
c)
Atoms combine to form molecules through chemical bonds.
d)
Neutrons have a positive charge.
|
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Nk Classes answered |
Neutrons have a positive charge is incorrect because neutrons are neutral particles with no charge.
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