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Q. If α,β and γ are the zeros of the polynomial 2x^3 – 6x^2 – 4x + 30, then the value of (αβ + βγ + γα) isa) 5b) 2c) -2d) -30Correct answer is option 'C'. Can you explain this answer?
|
Vikram Kapoor answered |
We have a 3 degree polynomial here of form
ax3 + bx2 + cx +d = 0
Polynomial p(x) = 2x3 – 6x2 – 4x + 30
ax3 + bx2 + cx +d = 0
Polynomial p(x) = 2x3 – 6x2 – 4x + 30
The roots of this polynomial are α, β, γ
We have formula for products of zeroes taking 2 at a time = αβ + βγ + αγ = c/a
αβ + βγ + αγ = -4/2 = -2
We have formula for products of zeroes taking 2 at a time = αβ + βγ + αγ = c/a
αβ + βγ + αγ = -4/2 = -2
One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that The card drawn is black.
- a)can't be determined
- b)1/4
- c)8/13
- d)1/2
Correct answer is option 'D'. Can you explain this answer?
One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that The card drawn is black.
a)
can't be determined
b)
1/4
c)
8/13
d)
1/2
|
Krishna Iyer answered |
Total cards n(S)=52
There are 26 black cards in a pack n(B)=26
There are 26 black cards in a pack n(B)=26
P(E) = n(B)/n(S) = 26/52 = 1/2
When “France sneezes, the rest of Europe catches a cold.” Who said these words?- a)Metternich
- b)Lenin
- c)Napoleon
- d)William-I
Correct answer is option 'A'. Can you explain this answer?
When “France sneezes, the rest of Europe catches a cold.” Who said these words?
a)
Metternich
b)
Lenin
c)
Napoleon
d)
William-I
|
Gaurav Kumar answered |
If "France sneezes, rest of Europe catches cold" was said by Metternich, the Austrian Chancellor.
He opined that the political developments in France were stimulative to other countries of Europe like the French Revolution and the ideals of liberty, equality and fraternity.
Romanticism refers to a:- a)cultural movement
- b)religious movement
- c)political movement
- d)literary movement
Correct answer is option 'A'. Can you explain this answer?
Romanticism refers to a:
a)
cultural movement
b)
religious movement
c)
political movement
d)
literary movement
|
|
Vikram Kapoor answered |
Romanticism was an artistic, intellectual and cultural movement that ran from the late eighteenth century through the nineteenth century.
Romanticism can be seen as a rejection of the precepts of order, calm, harmony, balance, idealization, and rationality that typified Classicism in general and late 18th-century.
The Homogeneous mixture of two or more metals or a metal and a non-metal is called an:- a)Alloy
- b)Mineral
- c)Ore
- d)Both alloy and ore
Correct answer is option 'A'. Can you explain this answer?
The Homogeneous mixture of two or more metals or a metal and a non-metal is called an:
a)
Alloy
b)
Mineral
c)
Ore
d)
Both alloy and ore
|
Naina Sharma answered |
An alloy is a homogenous mixture of two or more metals or non metals mixed in a molten state.
Oxidation involves
(i) gain of electron
(ii) loss of electron
(iii) addition of oxygen or electronegative element
(iv) removal of hydrogen or electropositive element- a)(i), (ii), (iii)
- b)(ii), (iii), (iv)
- c)(i), (iii), (iv)
- d)(i), (ii), (iv)
Correct answer is option 'B'. Can you explain this answer?
Oxidation involves
(i) gain of electron
(ii) loss of electron
(iii) addition of oxygen or electronegative element
(iv) removal of hydrogen or electropositive element
(i) gain of electron
(ii) loss of electron
(iii) addition of oxygen or electronegative element
(iv) removal of hydrogen or electropositive element
a)
(i), (ii), (iii)
b)
(ii), (iii), (iv)
c)
(i), (iii), (iv)
d)
(i), (ii), (iv)
|
|
Vikram Kapoor answered |
Oxidation process involves :-
Addition of O2 or electronegative element.
Removal of H/ Electropositive element.
Loss of electron.
Addition of O2 or electronegative element.
Removal of H/ Electropositive element.
Loss of electron.
What is the average time interval for the repetition of menstrual cycle in females?- a)18-20 days
- b)23-25 days
- c)28-30 days
- d)20-22 days
Correct answer is option 'C'. Can you explain this answer?
What is the average time interval for the repetition of menstrual cycle in females?
a)
18-20 days
b)
23-25 days
c)
28-30 days
d)
20-22 days
|
|
Nisha Choudhury answered |
The length of your cycle is the number of days between periods, counting the first day of your period until the day before your next period starts.
For adults not using any form of hormonal contraceptive or IUD, a typical cycle length ranges between 24 to 38 days.
Using hormonal birth control or an IUD may change the length and variation of your cycle.
Who were the ‘Junkers’?- a)Soldiers
- b)Large landowners
- c)Aristocracy
- d)Weavers
Correct answer is option 'B'. Can you explain this answer?
Who were the ‘Junkers’?
a)
Soldiers
b)
Large landowners
c)
Aristocracy
d)
Weavers
|
|
Vivek Rana answered |
Junkers was a common word to denote all the landed nobility who owned great estates. These estates were owned by small peasants who had few rights.
The most serious source of nationalist tension in Europe, after 1871, was an area called- a)Ottoman
- b)Prussia
- c)Balkans
- d)Macedonia
Correct answer is option 'C'. Can you explain this answer?
The most serious source of nationalist tension in Europe, after 1871, was an area called
a)
Ottoman
b)
Prussia
c)
Balkans
d)
Macedonia
|
Ayush Saha answered |
The most serious source of nationalist tension in Europe after 1871 was the area called the Balkans. (i) The Balkans was a region of geographical and ethnic variations comprising modern day Romania, Bulgaria, Albania, Greece, Macedonia.
Tissue that transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant, are called:- a)Phloem
- b)Stomata
- c)Xylem
- d)Guard cells
Correct answer is option 'A'. Can you explain this answer?
Tissue that transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant, are called:
a)
Phloem
b)
Stomata
c)
Xylem
d)
Guard cells
|
Eren Jaeger answered |
The phloem make up the vascular tissue of a plant and transports water, sugars, and other important substances around a plant. Phloem is responsible for transporting food produced from photosynthesis from leaves to non-photosynthesizing parts of a plant such as roots and stems
The ability of the metals to be drawn into thin wires is known as - a)ductility
- b)malleability
- c)sonorousity
- d)conductivity
Correct answer is option 'A'. Can you explain this answer?
The ability of the metals to be drawn into thin wires is known as
a)
ductility
b)
malleability
c)
sonorousity
d)
conductivity
|
Jyoti dubey answered |
The ability of a metal to be drawn into wires is called ductility.
Which of the following protects inner lining of stomach from hydrochloric acid secreted by gastric glands ?- a)Pepsinogen
- b)Pepsin
- c)Bile juice
- d)Mucus
Correct answer is option 'D'. Can you explain this answer?
Which of the following protects inner lining of stomach from hydrochloric acid secreted by gastric glands ?
a)
Pepsinogen
b)
Pepsin
c)
Bile juice
d)
Mucus
|
Subhankar Kapoor answered |
Small pores called gastric pits contain many exocrine cells that secrete digestive enzymes and hydrochloric acid into the lumen, or hollow region, of the stomach. Mucous cells found throughout the stomach lining and gastric pits secrete mucus to protect the stomach from its own digestive secretions.
Blood vessels that connect arteries to veins are called:- a)Neurons
- b)Capillaries
- c)Nephrons
- d)Muscles
Correct answer is option 'B'. Can you explain this answer?
Blood vessels that connect arteries to veins are called:
a)
Neurons
b)
Capillaries
c)
Nephrons
d)
Muscles
|
Rachit Agrah.ari answered |
Capillaries connect arteries to veins and help in exchange of substances across cells.
What is observed when a solution of potassium iodide is added to lead nitrate solution ?- a)No reaction takes place
- b)White precipitate of silver iodide is formed
- c)Yellow precipitate of PbI2 is formed
- d)Agl is soluble in water
Correct answer is option 'C'. Can you explain this answer?
What is observed when a solution of potassium iodide is added to lead nitrate solution ?
a)
No reaction takes place
b)
White precipitate of silver iodide is formed
c)
Yellow precipitate of PbI2 is formed
d)
Agl is soluble in water
|
|
Vikram Kapoor answered |
When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed along with lead iodide.
This is an example of double displacement reaction.
Also , as yellow precipitate is formed , this is also an example of precipitation reaction
This is an example of double displacement reaction.
Also , as yellow precipitate is formed , this is also an example of precipitation reaction
Balanced Equation: Pb(NO3)2 + 2KI → 2KNO3 + PbI2
An organism’s body has a large proportion of dead cells, have low energy needs, and can use relatively slow transport system. This organism could be :- a)Fishes
- b)Reptiles
- c)Plants
- d)Human beings
Correct answer is option 'C'. Can you explain this answer?
An organism’s body has a large proportion of dead cells, have low energy needs, and can use relatively slow transport system. This organism could be :
a)
Fishes
b)
Reptiles
c)
Plants
d)
Human beings
|
Arun Yadav answered |
Plants: Plants do not move. They have a large proportion of dead tissues. Some plants are very tall. So, plants generally have relative slow transport system.
During inhalation, diaphragm becomes- a)Dome Shaped
- b)Normal
- c)Oblique
- d)Flattened
Correct answer is option 'D'. Can you explain this answer?
During inhalation, diaphragm becomes
a)
Dome Shaped
b)
Normal
c)
Oblique
d)
Flattened
|
|
Anjana Khatri answered |
During the process of inhalation, ribs move upwards and the diaphragm becomes flattened. During the process of exhalation, ribs move downwards and the diaphragm becomes dome shaped. Air pressure inside the lungs increases, so, air from the lungs is automatically expelled.
The solution of the equations x – y = 2 and x + y = 4 is:- a)3 and 5
- b)5 and 3
- c)3 and 1
- d)–1 and –3
Correct answer is option 'C'. Can you explain this answer?
The solution of the equations x – y = 2 and x + y = 4 is:
a)
3 and 5
b)
5 and 3
c)
3 and 1
d)
–1 and –3
|
Meera Rana answered |
Adding both equations, we have
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining ?
(i) Au
(ii) Cu
(iii) Na
(iv) K- a)(i) and (ii)
- b)(i) and (iii)
- c)(ii) and (iii)
- d)(iii) and (iv)
Correct answer is option 'A'. Can you explain this answer?
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining ?
(i) Au
(ii) Cu
(iii) Na
(iv) K
(i) Au
(ii) Cu
(iii) Na
(iv) K
a)
(i) and (ii)
b)
(i) and (iii)
c)
(ii) and (iii)
d)
(iii) and (iv)
|
|
Gaurav Kumar answered |
Electrolytic refining is used for metals like Cu, Zn, Ag, Au etc. The method to be used for refining an impure metal depends on the nature of the metals as well as on the nature of impurities present in it. So, metals Au (gold) and Cu (copper) are refined by electrolytic refining.
Which of the following will not conduct electricity?- a)Molten NaCl
- b)NaCl dissolved in water
- c)Solid NaCl
- d)Both molten and solid NaCl
Correct answer is option 'C'. Can you explain this answer?
Which of the following will not conduct electricity?
a)
Molten NaCl
b)
NaCl dissolved in water
c)
Solid NaCl
d)
Both molten and solid NaCl
|
Rohan Kapoor answered |
NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. This is because the electrons in a solid state won't be free to move to either the Cathode (-ve) or to the Anode (+ve).
The instrument used to measure transpiration is :- a)Barometer
- b)Porometer
- c)Thermometer
- d)Potometer
Correct answer is option 'D'. Can you explain this answer?
The instrument used to measure transpiration is :
a)
Barometer
b)
Porometer
c)
Thermometer
d)
Potometer
|
|
Vikas Kumar answered |
Potometer
A potometer (from Greek ποτo = drunken, and μeτρο = measure) — sometimes known as a transpirometer — is a device used for measuring the rate of water uptake of a leafy shoot. The causes of water uptake are photosynthesis and transpiration.
When a magnesium ribbon is burnt in air, the ash formed is - a) black
- b) white
- c) yellow
- d) pink
Correct answer is option 'B'. Can you explain this answer?
When a magnesium ribbon is burnt in air, the ash formed is
a)
black
b)
white
c)
yellow
d)
pink
|
Pooja Shah answered |
When a magnesium ribbon is burned in air, it burns with a dazzling white flame producing white ash.
Yes, Mg is oxidized.
2Mg + O2 → 2MgO
One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that The card drawn is black and a queen.- a)1/13
- b)1/52
- c)1/26
- d)5/6
Correct answer is option 'B'. Can you explain this answer?
One card is drawn from a pack of 52 cards, each of the 52 cards being equally likely to be drawn. Find the probability that The card drawn is black and a queen.
a)
1/13
b)
1/52
c)
1/26
d)
5/6
|
Deepesh Singh Sengar. answered |
Ans c - 1/26 is the right answer. not b
By which of the following treaties was the United Kingdom of Great Britain formed?- a)Treaty of Versailles
- b)Act of Union
- c)Treaty of Paris
- d)Treaty of Vienna
Correct answer is option 'B'. Can you explain this answer?
By which of the following treaties was the United Kingdom of Great Britain formed?
a)
Treaty of Versailles
b)
Act of Union
c)
Treaty of Paris
d)
Treaty of Vienna
|
Ishan Choudhury answered |
The United Kingdom of Britain was formed when Scotland and England made a treaty in 1707 to incorporate Scotland into England. However, this treaty imposed English language and English culture on Scotland. It was the start of the formation of United Kingdom. It is also known as the Act of Union of 1707.
The formula of Ammonium phosphate is - a)NH4PO4
- b)(NH4)2PO4
- c)(NH4)3PO4
- d)(NH4)3(PO4)2
Correct answer is option 'C'. Can you explain this answer?
The formula of Ammonium phosphate is
a)
NH4PO4
b)
(NH4)2PO4
c)
(NH4)3PO4
d)
(NH4)3(PO4)2
|
|
Amit Kumar answered |
The formula of ammonium phosphate is
( NH4) 3 PO4 . The salt compound consists of positively charged ammonium cations and phosphate anion which carries -3 formal charge.
( NH4) 3 PO4 . The salt compound consists of positively charged ammonium cations and phosphate anion which carries -3 formal charge.
The smallest blood vessel in the body is:- a)Capillary
- b)Artery
- c)Vein
- d)Vena cava
Correct answer is option 'A'. Can you explain this answer?
The smallest blood vessel in the body is:
a)
Capillary
b)
Artery
c)
Vein
d)
Vena cava
|
|
Amit Kumar answered |
As capillaries are the connecting link between arteries and veins as well as site of exchange of materials they are the smallest blood vessels.
Which of the following group of powers collectively defeated Napoleon?- a)England, France, Italy, Russia
- b)England, Austria, Spain, Russia
- c)Austria, Prussia, Russia, Britain
- d)Britain, Prussia, Russia, Italy
Correct answer is option 'C'. Can you explain this answer?
Which of the following group of powers collectively defeated Napoleon?
a)
England, France, Italy, Russia
b)
England, Austria, Spain, Russia
c)
Austria, Prussia, Russia, Britain
d)
Britain, Prussia, Russia, Italy
|
|
Anita Menon answered |
Four Countries were responsible for Napoleon's Defeat:
► B= Britain
► R= Russia
► A= Austria
► P= Prussia
► R= Russia
► A= Austria
► P= Prussia
Which of the following substances is transported by phloem tissue?- a)Sucrose prepared by leaves
- b)Water
- c)ATP
- d)minerals
Correct answer is option 'A'. Can you explain this answer?
Which of the following substances is transported by phloem tissue?
a)
Sucrose prepared by leaves
b)
Water
c)
ATP
d)
minerals
|
Gunjan Lakhani answered |
- Plants have two transport systems - xylem and phloem .
- Xylem transports water and minerals. Phloem transports sugars (sucrose) and amino acids dissolved in water.
I _____________________ anyone interesting since I moved into this apartment.- a)haven’t meet
- b)will not meet
- c)haven't met
- d)will not be meeting
Correct answer is option 'C'. Can you explain this answer?
I _____________________ anyone interesting since I moved into this apartment.
a)
haven’t meet
b)
will not meet
c)
haven't met
d)
will not be meeting
|
Sun Ray Institute answered |
Answer:
Explanation:
To determine the correct answer, we need to identify the correct verb tense to use in the given sentence. The sentence is in the present perfect tense, which is used to talk about an action that started in the past and is still continuing in the present. In this case, the action is meeting someone interesting.
Now let's analyze the options:
- A: haven’t meet: This option is incorrect because it uses the present tense form "meet" instead of the past participle form "met" that should be used with "have" in the present perfect tense.
- B: will not meet: This option is incorrect because it uses the future tense "will not meet" instead of the present perfect tense that is required in the sentence.
- C: haven't met: This option is correct. It uses the present perfect tense with the correct form "haven't met" (have + past participle) to indicate that the speaker has not met anyone interesting since moving into the apartment.
- D: will not be meeting: This option is incorrect because it uses the future continuous tense "will not be meeting" instead of the present perfect tense that is needed in the sentence.
Therefore, the correct answer is C: haven't met.
William Harvey is known for discovery of :- a)Blood circulation
- b)Blood clotting
- c)Respiration
- d)Digestion
Correct answer is option 'A'. Can you explain this answer?
William Harvey is known for discovery of :
a)
Blood circulation
b)
Blood clotting
c)
Respiration
d)
Digestion
|
|
Gaurav Kumar answered |
William Harvey is known for the discovery of blood circulation. He was the first person to correctly describe blood’s circulation in the body. He showed that arteries and veins form a complete circuit. The circuit starts at the heart and leads back to the heart. So, the correct answer is option A.
Which component allows the movement of sugar stored in the roots or stem to the newly growing buds in spring?- a)Tracheids
- b)Phloem
- c)Xylem
- d)Vessels
Correct answer is option 'B'. Can you explain this answer?
Which component allows the movement of sugar stored in the roots or stem to the newly growing buds in spring?
a)
Tracheids
b)
Phloem
c)
Xylem
d)
Vessels
|
|
Rahul Kapoor answered |
In spring, new buds are formed. These buds need more energy to grow than other parts of the plant.
This energy comes from the sugar stored in the root or stem tissue to the buds by phloem. Thus. buds need the sugars in springs.
Which of the following was not a part of Napoleon’s defeat?- a)Britain
- b)Austria
- c)Italy
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Which of the following was not a part of Napoleon’s defeat?
a)
Britain
b)
Austria
c)
Italy
d)
None of these
|
|
Garima Datta answered |
The correct option is C Italy
At the battle of Waterloo in 1815, Napoleon was defeated by four major powers: Britain, Russia, Austria, and Prussia. Italy was not part of this battle.
• In 1804. Napoleon Bonaparte became emperor of France.
• He was defeated at waterloo in 1815.
• Many of his measures that carried the revolutionary ideas of liberty and modern laws of other parts of Europe had an impact on people long after Napoleonic had left.
Napoleon Bonaparte
Get to know in detail about Napoleon Bonaparte and the French Revolution through the doc:
The two kinds of elements present in xylem are:- a)Sieve tube and vessels
- b)Tracheids and vessels
- c)Guard cells and fibres
- d)Sieve tube and companion cells
Correct answer is option 'B'. Can you explain this answer?
The two kinds of elements present in xylem are:
a)
Sieve tube and vessels
b)
Tracheids and vessels
c)
Guard cells and fibres
d)
Sieve tube and companion cells
|
|
Amit Kumar answered |
- The xylem tracheary elements consist of cells known as tracheids and vessel members, both of which are typically narrow, hollow, and elongated.
- Tracheids are less specialized than the vessel members.
- Main function of xylem – upwards water transport.
- The xylem, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plants.
- The system transports water and soluble mineral nutrients from the roots throughout the plant.
An alloy is- a)an element
- b)a compound
- c)a homogeneous mixture
- d)a heterogeneous mixture
Correct answer is option 'C'. Can you explain this answer?
An alloy is
a)
an element
b)
a compound
c)
a homogeneous mixture
d)
a heterogeneous mixture
|
Aarya Reddy answered |
An alloy is a homogeneous mixture. Alloy is a homogeneous mixture of two or more metals. For example, brass is an alloy of copper and zinc. Stainless steel is an alloy made with combination of iron with chromium with nickel.
Which of the following reaction requires light?- a)Electrolytic decomposition reactions
- b)Photolytic decomposition reactions
- c)Combination reactions
- d)Thermolytic decomposition reactions
Correct answer is option 'B'. Can you explain this answer?
Which of the following reaction requires light?
a)
Electrolytic decomposition reactions
b)
Photolytic decomposition reactions
c)
Combination reactions
d)
Thermolytic decomposition reactions
|
|
Rohan Kapoor answered |
Photodissociation, photolysis, or photodecomposition is a chemical reaction in which a chemical compound is broken down by photons. It is defined as the interaction of one or more photons with one target molecule. Photodissociation is not limited to visible light.
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature ?- a)Na
- b)Fe
- c)Cr
- d)Hg
Correct answer is option 'D'. Can you explain this answer?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature ?
a)
Na
b)
Fe
c)
Cr
d)
Hg
|
|
Krishna Iyer answered |
All metals are solid at room temperature except for mercury. Mercury(hg) metal exists as a liquid at room temperature.
Which of the following did not play a role to develop nationalist sentiments?- a)Art
- b)Music
- c)Climate
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Which of the following did not play a role to develop nationalist sentiments?
a)
Art
b)
Music
c)
Climate
d)
None of these
|
|
Gaurav Kumar answered |
Climate did not play a role in the development of national sentiments.
Arteries carry oxygenated blood except :- a)Pulmonary
- b)Cardiac
- c)Hepatic
- d)Systemic
Correct answer is option 'A'. Can you explain this answer?
Arteries carry oxygenated blood except :
a)
Pulmonary
b)
Cardiac
c)
Hepatic
d)
Systemic
|
|
Naina Sharma answered |
It is the only exception. Pulmonary vein is the only vein to carry oxygenated blood.
Four chambered heart is found in :- a)Cobra
- b)Tortoise
- c)Salamander
- d)Crocodile
Correct answer is option 'D'. Can you explain this answer?
Four chambered heart is found in :
a)
Cobra
b)
Tortoise
c)
Salamander
d)
Crocodile
|
|
Naina Sharma answered |
Other reptiles do not have a complete 4 chambered heart. But in crocodile the 4 chambers are well developed and distinct.
- a)Muscle cells
- b)Nerve cells
- c)Alveoli of lungs
- d)Intestinal villi
Correct answer is 'A'. Can you explain this answer?
|
|
Nisha Choudhury answered |
In human beings, when there is a lack of oxygen in muscle cells, the pyruvate is converted into lactic acid.
Sperm transfer in males can be prevented by blocking the:- a)Urethra
- b)Vas deferens
- c)Prostate gland
- d)Seminal vesicles
Correct answer is option 'B'. Can you explain this answer?
Sperm transfer in males can be prevented by blocking the:
a)
Urethra
b)
Vas deferens
c)
Prostate gland
d)
Seminal vesicles
|
|
Rohan Kapoor answered |
Sperm are made in the testes, and stored in a tightly coiled tube called the epididymis, inside the testicles. When a man ejaculates, smooth muscle propels the sperm out of the epididymis, through a tube called the vas deferens, into the urethra and out of the body. Receptors on the muscles receive hormonal signals that instruct the muscles to contract, sending the sperm on its way.
Previous attempts to block these receptors, known as α1A-adrenoceptors and P2X1-purinoceptors, had decreased male fertility, but not entirely — male mice with blocked receptors could still father offspring up to 50 percent of the time.
Fish anticipates the presence of hunter farther due to- a)Scattering of light
- b)Reflection of light
- c)Dispersion of light
- d)Refraction of light
Correct answer is 'D'. Can you explain this answer?
Fish anticipates the presence of hunter farther due to
a)
Scattering of light
b)
Reflection of light
c)
Dispersion of light
d)
Refraction of light
|
|
Vivek Rana answered |
Light coming from the fish refracts (changes direction) when it hits the surface. A person above the water sees the apparent position of the fish closer to the surface than the real position of the fish.
Which one of the following properties is not generally exhibited by ionic compounds ?- a)Solubility in water
- b)Electrical conductivity in solid state
- c)High melting and boiling points
- d)Electrical conductivity in molten state
Correct answer is option 'B'. Can you explain this answer?
Which one of the following properties is not generally exhibited by ionic compounds ?
a)
Solubility in water
b)
Electrical conductivity in solid state
c)
High melting and boiling points
d)
Electrical conductivity in molten state
|
|
Kiran Mehta answered |
Ionic compounds conduct electricity only in the molten state and not in solid state.
__________ friend is over there by the cafeteria. Can you see him?- a)Me
- b)My
- c)Mine
Correct answer is option 'B'. Can you explain this answer?
__________ friend is over there by the cafeteria. Can you see him?
a)
Me
b)
My
c)
Mine
|
|
Priyanka Sharma answered |
My is the correct ✔ answer.
My, your, his her, its, our and their are possessive adjectives. They are used at the beginning of noun phrases. Examples are :- My daughter, your son.
My, your, his her, its, our and their are possessive adjectives. They are used at the beginning of noun phrases. Examples are :- My daughter, your son.
Mercury is transported in the container's made up of- a)Al
- b)Fe
- c)Ag
- d)Pb
Correct answer is option 'B'. Can you explain this answer?
Mercury is transported in the container's made up of
a)
Al
b)
Fe
c)
Ag
d)
Pb
|
|
Pooja Shah answered |
Mercury is a liquid which is transported in iron containers, as iron does not amalgamate with mercury.
A chemical reaction has taken place can be represented by which of the following condition?- a)Evolution of gas
- b)Heat released
- c)Change in color
- d)All the above
Correct answer is option 'D'. Can you explain this answer?
A chemical reaction has taken place can be represented by which of the following condition?
a)
Evolution of gas
b)
Heat released
c)
Change in color
d)
All the above
|
|
Krishna Iyer answered |
When a metal react with acid then hydrogen gas evolve, in this way evolution of gas occurs during chemical reaction. When sodium react with cold water then hear is released, even it also catch fire. Wgen iron react with copper sulphate then copper is displaced by iron and change the colour of solution.
Which of the following substance produces brisk effervescence with baking soda solution?- a)Ethanoic acid
- b)Table salt
- c)Vinegar
- d)Sunflower oil
Correct answer is option 'A'. Can you explain this answer?
Which of the following substance produces brisk effervescence with baking soda solution?
a)
Ethanoic acid
b)
Table salt
c)
Vinegar
d)
Sunflower oil
|
|
Meera Rana answered |
Ethanoic acid when treated with baking soda (Sodium hydrogen carbonate) gives brisk effervescence of Carbon dioxide gas.
Which of the following is a combination reaction?- a)2 Pb(NO3)2 → 2 PbO + 4 NO2 + O2
- b)2 AgCl → 2 Ag + Cl2
- c)CaCO3→ CaO + CO2
- d)C + O2 → CO2
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a combination reaction?
a)
2 Pb(NO3)2 → 2 PbO + 4 NO2 + O2
b)
2 AgCl → 2 Ag + Cl2
c)
CaCO3→ CaO + CO2
d)
C + O2 → CO2
|
|
Gaurav Kumar answered |
A reaction in which two or more reactants combine together to form a single product.
Example : C + O2 → CO2
Example : C + O2 → CO2
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