Mock Test – CBSE Class 12 Science (Physics, Chemistry and Biology) - CollegeXpad Navigating your Educational Journey

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Mock Test For CBSE Class 12 Students (Science)

Here's a Mock Test for Class 12 Students.

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1. Which of the following is a characteristic property of a base?

A.

Reacts with metals to form salts

B.

Turns litmus paper blue

C.

Bitter taste

D.

Releases hydrogen ions (H⁺) in solution

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2. The term "isotope" refers to atoms of the same element that have different:

A. Atomic number

B. Ionization energy

C. Electron configuration

D. Mass number

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3. What is the SI unit of electric flux?

A. Volt-meter

B. Coulomb

C. Weber

D. Farad

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4. According to the theory of relativity, as an object's velocity approaches the speed of light, its:

A. Time slows down

B. Length increases

C. Density increases

D. Mass decreases

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5. What is the function of ribosomes in a cell?

A. ATP production

B. Lipid synthesis

C. DNA replication

D. Protein synthesis

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6. Which of the following represents the correct relationship between frequency ( $f$ ), wavelength ( $λ$ ), and speed of a wave ( $v$ )?

A. v= f /λ

B. v=f×λ

C. v= λ /f

D. v=f+λ

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7. What is the SI unit of magnetic flux density?

A. Gauss

B. Ampere-turn

C. Tesla

D. Weber

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8. What is the primary function of the kidneys in the human body?

A. Regulation of blood sugar levels

B. Filtration of blood and urine production

C. Production of red blood cells

D. Regulation of body temperature

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9. In a redox reaction, oxidation is the:

A. Gain of protons

B. Loss of electrons

C. Loss of protons

D. Gain of electrons

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10. Which of the following compounds exhibits hydrogen bonding?

A.

Ethane (C₂H₆)

B.

Methane (CH4)

C.

Ethanol (C₂H₅OH)

D.

Propane (C3H8)

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11. What type of bond is formed when electrons are shared between atoms?

A. Metallic bond

B. Ionic bond

C. Hydrogen bond

D. Covalent bond

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12. The process by which an unstable atomic nucleus loses energy by emitting radiation is called:

A. Fusion

B. Ionization

C. Radioactive decay

D. Fission

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13. What is the function of chlorophyll in photosynthesis?

A. Produce ATP

B. Break down glucose

C. Release oxygen

D. Absorb sunlight

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14. Which of the following is NOT a fundamental force in nature?

A. Electromagnetic force

B. Strong nuclear force

C. Chemical force

D. Gravitational force

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15. Which of the following statements best describes the phenomenon of quantum tunneling?

A. Particles penetrate a potential energy barrier without having enough energy to overcome it classically.

B. Electrons move randomly within an atom's orbitals.

C. Light bends when passing through a medium.

D. Electrons jump from one energy level to another.

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16. Which of the following is NOT a function of the cell membrane?

A. Recognition and signaling

B. Cell adhesion

C. Regulation of cellular transport

D. Protein synthesis

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17. Which of the following is a hormone produced by the pancreas that regulates blood sugar levels?

A. Testosterone

B. Estrogen

C. Insulin

D. Adrenaline

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18. Which phenomenon describes the bending of light when it passes from one medium to another?

A. Polarization

B. Diffraction

C. Refraction

D. Dispersion

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19. Which of the following is an example of an exothermic reaction?

A. Dissolving salt in water

B. Photosynthesis

C. Burning wood

D. Melting ice

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20. What is the oxidation state of oxygen in H2O2 (hydrogen peroxide)?

A. -1

B. -2

C. 0

D. +1

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21. What is the chemical formula for sulfuric acid?

A.

H₂SO₄

B.

HCl

C.

HNO₃

D.

NaOH

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22. What is the primary function of the Golgi apparatus?

A. Protein modification and packaging

B. Protein synthesis

C. Lipid storage

D. Cellular respiration

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23. Which of the following is NOT a transition metal?

A. Iron

B. Copper

C. Calcium

D. Zinc

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24. Which of the following is NOT a characteristic of prokaryotic cells?

A. Membrane-bound organelles

B. Ribosomes

C. Circular DNA

D. Cell wall

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25. Which of the following is NOT a component of the human immune system?

A. Lymph nodes

B. White blood cells

C. Platelets

D. Antibodies

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26. Which of the following is an example of an endothermic reaction?

A. Neutralization of an acid with a base

B. Photosynthesis

C. Combustion of methane

D. Freezing of water

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27. In humans, which blood vessel carries oxygenated blood away from the heart to the body tissues?

A. Aorta

B. Pulmonary artery

C. Pulmonary vein

D. Vena cava

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28. What is the maximum number of electrons that can occupy the ( n = 3 ) energy level in an atom?

A. 8

B. 32

C. 6

D. 18

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29. What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-9 M?

A. 9

B. 7

C. 3

D. 5

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30. According to the law of conservation of momentum, in a closed system, the total momentum:

A. Increases with time

B. Remains constant

C. Is unpredictable

D. Decreases with time

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