Physics Mock Test

1

Regarding displacement and distance, which of the following statements is INCORRECT?

A. For an object moving in a straight line, displacement and distance are equal.

B. A particle traveling from the starting point to the endpoint via different paths may have different distances but the same displacement.

C. A particle traveling a certain distance may have zero displacement.

D. The magnitude of a particle's displacement can never be greater than the distance traveled.

2

Regarding atomic structure, which of the following statements is correct?

A. The number of electrons outside the nucleus equals the sum of neutrons and protons in the nucleus.

B. The mass of an atom is almost equal to the mass of its nucleus.

C. Atoms with the same number of protons have equal mass.

D. Atoms with equal mass have the same number of electrons outside the nucleus.

3

Protons and neutrons are both composed of up quarks (charge +2e/3) and down quarks (charge -e/3). Given that the number of up and down quarks in a proton equals the number of down and up quarks in a neutron respectively, the number of down quarks in a proton is:

A. 0

B. 1

C. 2

D. 3

4

Natural radioactive elements emit α, β, and γ radiation during decay. β-rays are:

A. Photon beams

B. Electron beams

C. Proton beams

D. Neutron beams

5

Visible light cannot penetrate buildings, but mobile phone signals can be received by people inside rooms. This is because:

A. Visible light doesn't have enough energy

B. Mobile phone signals are not electromagnetic waves

C. The wavelength of visible light is too short

D. Mobile phone power is very high

6

An object undergoing uniformly accelerated linear motion passes through points A, B, and C. Given that AB = BC, the average velocity in segment AB is 3 m/s, and the average velocity in segment BC is 6 m/s. The instantaneous velocity at point B is:

A. 4 m/s

B. 4.5 m/s

C. 5 m/s

D. 5.5 m/s

7

When a batch of light bulbs with the same rated power are connected in parallel to a power source, as more bulbs are added:

A. Each bulb becomes brighter

B. Each bulb becomes dimmer

C. The brightness of each bulb remains unchanged

D. The total actual power must decrease

8

If the length of a simple pendulum is increased by 1.2 m, its period becomes twice the original period. The original length of this pendulum is:

A. 1.2 m

B. 0.6 m

C. 1.0 m

D. 0.4 m

9

An object moving in projectile motion experiences a velocity change every second that is always:

A. Equal in magnitude and same in direction

B. Unequal in magnitude and different in direction

C. Equal in magnitude and different in direction

D. Unequal in magnitude and same in direction

10

Satellites orbiting Earth in uniform circular motion at different heights from the ground have the following characteristic: the higher the satellite, the:

A. Greater the linear velocity

B. Greater the angular velocity

C. Greater the centripetal acceleration

D. Greater the orbital period

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