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 an example of an endothermic reaction?

A. Freezing of water

B. Photosynthesis

C. Neutralization of an acid with a base

D. Combustion of methane

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

A. Refraction

B. Polarization

C. Dispersion

D. Diffraction

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

A. Ribosomes

B. Membrane-bound organelles

C. Cell wall

D. Circular DNA

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4. Which of the following compounds exhibits hydrogen bonding?

A.

Methane (CH4)

B.

Propane (C3H8)

C.

Ethanol (C₂H₅OH)

D.

Ethane (C₂H₆)

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

A. Regulation of cellular transport

B. Cell adhesion

C. Protein synthesis

D. Recognition and signaling

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6. What is the chemical formula for sulfuric acid?

A.

H₂SO₄

B.

NaOH

C.

HCl

D.

HNO₃

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

A. Electrons jump from one energy level to another.

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

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

A.

Turns litmus paper blue

B.

Releases hydrogen ions (H⁺) in solution

C.

Bitter taste

D.

Reacts with metals to form salts

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9. 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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10. What is the primary function of the Golgi apparatus?

A. Lipid storage

B. Protein synthesis

C. Protein modification and packaging

D. Cellular respiration

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

A. Mass number

B. Atomic number

C. Electron configuration

D. Ionization energy

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

A. Regulation of blood sugar levels

B. Regulation of body temperature

C. Filtration of blood and urine production

D. Production of red blood cells

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

A. Pulmonary vein

B. Vena cava

C. Pulmonary artery

D. Aorta

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

A. Protein synthesis

B. DNA replication

C. ATP production

D. Lipid synthesis

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

A. 0

B. +1

C. -2

D. -1

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

A. Tesla

B. Gauss

C. Weber

D. Ampere-turn

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

A. Strong nuclear force

B. Chemical force

C. Gravitational force

D. Electromagnetic force

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18. What is the function of chlorophyll in photosynthesis?

A. Release oxygen

B. Absorb sunlight

C. Break down glucose

D. Produce ATP

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

A. 32

B. 18

C. 8

D. 6

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

A. Ionization

B. Fission

C. Fusion

D. Radioactive decay

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21. What is the SI unit of electric flux?

A. Volt-meter

B. Weber

C. Coulomb

D. Farad

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

A. Calcium

B. Iron

C. Zinc

D. Copper

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

A. Burning wood

B. Melting ice

C. Photosynthesis

D. Dissolving salt in water

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24. 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= f /λ

D. v= λ /f

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

A. 7

B. 9

C. 3

D. 5

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

A. Hydrogen bond

B. Covalent bond

C. Metallic bond

D. Ionic bond

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

A. Mass decreases

B. Time slows down

C. Density increases

D. Length increases

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28. In a redox reaction, oxidation is the:

A. Gain of protons

B. Gain of electrons

C. Loss of electrons

D. Loss of protons

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

A. White blood cells

B. Platelets

C. Antibodies

D. Lymph nodes

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

A. Decreases with time

B. Increases with time

C. Is unpredictable

D. Remains constant

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