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Class 9 MCQs for UPPSC (UP) Exam
It covers all Important Questions with answers on Class 9 for the UPPSC (UP) exam. The questions are based on important topics. Details about the questions:- Topic: Class 9
- Type of Questions: MCQs with solutions
- Number of Questions: 50
- You can attempt them on EduRev to score high in UPPSC (UP) exam.
Living cells were discovered by- a)Robert Hooke
- b)Purkinje
- c)Leeuwenhoek
- d)Robert Brown
Correct answer is option 'C'. Can you explain this answer?
Living cells were discovered by
a)
Robert Hooke
b)
Purkinje
c)
Leeuwenhoek
d)
Robert Brown
 | Anita Menon answered |
Robert Hooke, a scientist, was the first person to discover the existence of cells with the help of a microscope in 1665 but they were dead cells.
Anton van Leeuwenhoek, in 1674 with the improved microscope, discovered free-living cells of algae Spirogyra in pond water for the first time.
The combining capacity of an element is called - a)Valency
- b)Atomicity
- c)Atomic number
- d)Valence electron
Correct answer is option 'A'. Can you explain this answer?
The combining capacity of an element is called
a)
Valency
b)
Atomicity
c)
Atomic number
d)
Valence electron
| | Aditi Sharma answered |
- The combining capacity of an element is known as its valency.
- Valency is the number of valence electrons in outer shell that take part in the chemical reaction.
Which of the following is not a mixture? a) Soap solutionb) Bloodc) Carbon dioxided) CoalCorrect answer is option 'C'. Can you explain this answer?
 | Gaurav Kumar answered |
Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.
A desert is ...................- a)an endless stretch of sand
- b)without rainfall
- c)without vegetation
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
A desert is ...................
a)
an endless stretch of sand
b)
without rainfall
c)
without vegetation
d)
all of the above
 | Parth Nambiar answered |
Desert
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Identify the correct symbol of Gold. - a)Go
- b)Gd
- c)Ge
- d)Au
Correct answer is option 'D'. Can you explain this answer?
Identify the correct symbol of Gold.
a)
Go
b)
Gd
c)
Ge
d)
Au
| | Aditi Sharma answered |
The chemical symbol for gold is Au, taken from the Latin word for gold- Aurum. Its atomic number is 79.
The atom is indivisible, was proposed by- a)Einstein
- b)Lavoisier
- c)Dalton
- d)Proust
Correct answer is option 'C'. Can you explain this answer?
The atom is indivisible, was proposed by
a)
Einstein
b)
Lavoisier
c)
Dalton
d)
Proust
 | Deepnarayan Chauhan answered |
Yes john Dalton say this first but this was expect after because this is made up of electron protein and nuetron
The smell of hydrogen sulphide (H2S) gas- a)pleasant
- b)of rotten egg
- c)of burning sulphur
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The smell of hydrogen sulphide (H2S) gas
a)
pleasant
b)
of rotten egg
c)
of burning sulphur
d)
None of these
 | Pooja Shah answered |
Hydrogen sulfide is a flammable, colorless gas with a characteristic odour of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.
The cell organelles (other than the nucleus) which contain DNA are- a)plastids and lysosomes
- b)mitochondria and Golgi apparatus
- c)Golgi apparatus and lysosomes
- d)plastids and mitochondria
Correct answer is option 'D'. Can you explain this answer?
The cell organelles (other than the nucleus) which contain DNA are
a)
plastids and lysosomes
b)
mitochondria and Golgi apparatus
c)
Golgi apparatus and lysosomes
d)
plastids and mitochondria
 | Mohit Rajpoot answered |
Both mitochondria and plastids possess their own genetic material and ribosomes .
The mitochondria DNA and plastid DNA possess genes which produce the proteins necessary for the functioning of mitochondria and plastids respectively.
Na+ has 12 neutrons and 10 electrons. Which of the following statement is correct?- a)Na+ has atomic number equal to 10 and mass number 22
- b)Na+ has atomic number equal to 11 and mass number 23
- c)Na+ has atomic number equal to 10 and mass number 23
- d)Na+ has atomic number equal to 11 and mass number 22
Correct answer is option 'B'. Can you explain this answer?
Na+ has 12 neutrons and 10 electrons. Which of the following statement is correct?
a)
Na+ has atomic number equal to 10 and mass number 22
b)
Na+ has atomic number equal to 11 and mass number 23
c)
Na+ has atomic number equal to 10 and mass number 23
d)
Na+ has atomic number equal to 11 and mass number 22
| | Geetika Shah answered |
The chemical symbol Na+ represents a sodium ion. The atomic number of sodium (Na) is 11, which means it has 11 protons.
Given that Na+ has 12 neutrons, we can determine the mass number by adding the number of neutrons to the number of protons. So, for Na+:
Given that Na+ has 12 neutrons, we can determine the mass number by adding the number of neutrons to the number of protons. So, for Na+:
Mass number = Number of neutrons + Number of protons Mass number = 12 neutrons + 11 protons Mass number = 23
The atomic number remains unchanged because it is determined by the number of protons, which is characteristic of each element. The loss or gain of electrons to form ions does not change the atomic number.
Therefore, the correct statement is: Na+ has an atomic number equal to 11 and a mass number of 23.
A prokaryotic cell does not possess- a)cell membrane
- b)cell wall
- c)nuclear membrane
- d)both (a) and (c)
Correct answer is option 'C'. Can you explain this answer?
A prokaryotic cell does not possess
a)
cell membrane
b)
cell wall
c)
nuclear membrane
d)
both (a) and (c)
| | Moonlight Stargirl answered |
Prokaryotic cells have no nuclear membrane thus there nucleus is considered not well defined
If a plant cell is kept in a hypotonic solution, it will- a)Increase in its volume
- b)Maintain the same volume
- c)Decrease in its volume
- d)Burst
Correct answer is option 'A'. Can you explain this answer?
If a plant cell is kept in a hypotonic solution, it will
a)
Increase in its volume
b)
Maintain the same volume
c)
Decrease in its volume
d)
Burst
 | Hansa Sharma answered |
When the plant cell is placed in a hypotonic solution , it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting.
Following are a few definitions of osmosis. Read carefully and select the correct definition. - a)Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane
- b)Movement of solvent molecules from its higher concentration to lower concentration
- c)Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane
- d)Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane
Correct answer is option 'A'. Can you explain this answer?
Following are a few definitions of osmosis. Read carefully and select the correct definition.
a)
Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane
b)
Movement of solvent molecules from its higher concentration to lower concentration
c)
Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane
d)
Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane
 | Raghav Bansal answered |
Osmosis is the passive movement of water or any other solvent molecules from a region of higher water concentration to a region of lower water concentration through a semipermeable membrane. This brings both the solutions separated by the semipermeable membrane to the equilibrium. Therefore, option A is correct.
The proteins and lipids, essential for building the cell membrane, are manufactured by- a)rough endoplasmic reticulum
- b)Golgi apparatus
- c)plasma membrane
- d)mitochondria
Correct answer is option 'A'. Can you explain this answer?
The proteins and lipids, essential for building the cell membrane, are manufactured by
a)
rough endoplasmic reticulum
b)
Golgi apparatus
c)
plasma membrane
d)
mitochondria
 | Keshav Kapoor answered |
Yes because ribosomes are sites are protein manufacture and they are found attached to the rough ER
On a velocity-time graph, a horizontal straight line corresponds to motion at- a)constant velocity
- b)zero velocity
- c)increasing velocity
- d)decreasing velocity
Correct answer is option 'A'. Can you explain this answer?
On a velocity-time graph, a horizontal straight line corresponds to motion at
a)
constant velocity
b)
zero velocity
c)
increasing velocity
d)
decreasing velocity
| | Arun Sharma answered |
It is horizontal so, angle is zero and also acceleration is zero. Hence constant velocity.
An external influence which changes or tends to change the state of rest or uniform motion of body or its dimensions is called:- a)momentum
- b)force
- c)moment of force
- d)pressure
Correct answer is 'B'. Can you explain this answer?
An external influence which changes or tends to change the state of rest or uniform motion of body or its dimensions is called:
a)
momentum
b)
force
c)
moment of force
d)
pressure
| | Ananya Das answered |
The slope of the velocity-time graph determines the acceleration.
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon is - a)1.032 x 1022
- b)6.886 × 1023
- c)3.88 x 1022
- d)1.302 x 1022
Correct answer is option 'A'. Can you explain this answer?
If isotopic distribution of C-12 and C-14 are 98% and 2% respectively, then number of C-14 atoms in 12 g of carbon is
a)
1.032 x 1022
b)
6.886 × 1023
c)
3.88 x 1022
d)
1.302 x 1022
| | Ananya Das answered |
In 12 g of carbon, the amount of C-14
= 12 × 2/100 = 0⋅24g
∴ C-14 atoms in 0.24g = (0⋅24×6⋅02×1023)/14
= 1⋅03×1022 atoms.
= 12 × 2/100 = 0⋅24g
∴ C-14 atoms in 0.24g = (0⋅24×6⋅02×1023)/14
= 1⋅03×1022 atoms.
Which one of the following phrases would be incorrect to use?- a)A mole of an element
- b)A mole of a compound
- c)An atom of an element
- d)An atom of a compound
Correct answer is option 'D'. Can you explain this answer?
Which one of the following phrases would be incorrect to use?
a)
A mole of an element
b)
A mole of a compound
c)
An atom of an element
d)
An atom of a compound
| | Krishna Iyer answered |
it will be incorrect to say that an atom of a compound because,
Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules , but not all molecules are compounds.
Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules , but not all molecules are compounds.
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