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. What is the chemical formula for sulfuric acid?

A.

HCl

B.

NaOH

C.

H₂SO₄

D.

HNO₃

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

A. Increases with time

B. Decreases with time

C. Is unpredictable

D. Remains constant

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

A. 7

B. 5

C. 3

D. 9

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

A.

Bitter taste

B.

Reacts with metals to form salts

C.

Releases hydrogen ions (H⁺) in solution

D.

Turns litmus paper blue

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

A. ATP production

B. DNA replication

C. Protein synthesis

D. Lipid synthesis

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

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

B. Electrons jump from one energy level to another.

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

D. Light bends when passing through a medium.

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

A. Protein modification and packaging

B. Protein synthesis

C. Cellular respiration

D. Lipid storage

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

A. v= λ /f

B. v=f+λ

C. v= f /λ

D. v=f×λ

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

A. 0

B. -1

C. -2

D. +1

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10. Which of the following compounds exhibits hydrogen bonding?

A.

Ethanol (C₂H₅OH)

B.

Methane (CH4)

C.

Ethane (C₂H₆)

D.

Propane (C3H8)

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11. What is the function of chlorophyll in photosynthesis?

A. Absorb sunlight

B. Produce ATP

C. Release oxygen

D. Break down glucose

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12. What is the SI unit of electric flux?

A. Coulomb

B. Weber

C. Volt-meter

D. Farad

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

A. Photosynthesis

B. Freezing of water

C. Combustion of methane

D. Neutralization of an acid with a base

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

A. Strong nuclear force

B. Gravitational force

C. Chemical force

D. Electromagnetic force

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

A. Fusion

B. Radioactive decay

C. Fission

D. Ionization

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

A. Gauss

B. Tesla

C. Ampere-turn

D. Weber

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

A. 6

B. 32

C. 18

D. 8

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

A. Photosynthesis

B. Burning wood

C. Dissolving salt in water

D. Melting ice

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

A. Platelets

B. White blood cells

C. Antibodies

D. Lymph nodes

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

A. Cell adhesion

B. Protein synthesis

C. Regulation of cellular transport

D. Recognition and signaling

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

A. Copper

B. Calcium

C. Zinc

D. Iron

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

A. Circular DNA

B. Ribosomes

C. Cell wall

D. Membrane-bound organelles

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

A. Length increases

B. Density increases

C. Mass decreases

D. Time slows down

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

A. Electron configuration

B. Atomic number

C. Ionization energy

D. Mass number

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

A. Metallic bond

B. Covalent bond

C. Ionic bond

D. Hydrogen bond

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

A. Vena cava

B. Aorta

C. Pulmonary vein

D. Pulmonary artery

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

A. Insulin

B. Estrogen

C. Adrenaline

D. Testosterone

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

A. Diffraction

B. Refraction

C. Polarization

D. Dispersion

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

A. Regulation of body temperature

B. Production of red blood cells

C. Regulation of blood sugar levels

D. Filtration of blood and urine production

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