POST UTME ABU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas is heated from 300 K to 400 K. If the initial volume is 2 L and the final volume is 4 L, what is the work done on the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 2
A beam of light is incident on a mirror at an angle of 30°. If the reflected ray makes an angle of 45° with the normal, what is the angle of incidence?
A. 20°
B. 30°
C. 40°
D. 50°
Question 3
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.0 L and the gas cons\tant is 0.082 L atm/mol K, what is the final pressure of the gas in atm?
A. 10 atm
B. 20 atm
C. 30 atm
D. 40 atm
Question 4
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. The particle is subject to a centripetal force $F_c = \frac{mv^2}{r}$. If the speed of the particle is doubled, what is the new centripetal force?
A. \frac{2mv^2}{r}
B. \frac{mv^2}{2r}
C. \frac{4mv^2}{r}
D. \frac{mv^2}{4r}
Question 5
A parallel plate capacitor has plates of area $A$ and separation $d$. The capaci\tance is given by $C = \frac{epsilon_0 A}{d}$. If the area of the plates is doubled and the separation is halved, what is the new capaci\tance?
A. \frac{2\epsilon_0 A}{d}
B. \frac{\epsilon_0 A}{2d}
C. \frac{4\epsilon_0 A}{d}
D. \frac{\epsilon_0 A}{4d}
Question 6
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 7
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. What is the magnitude of the net force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 8
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum velocity of the particle?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 10
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10^-6 F, what is the charge stored on the capacitor when a potential difference of 10 V is applied across it?
A. 10^-8 C
B. 10^-7 C
C. 10^-6 C
D. 10^-5 C
Question 11
A block of mass 5 kg is placed on a horizontal surface with a coefficient of friction of 0.2. If a force of 10 N is applied to the block, what is the acceleration of the block?
A. 0.2 m/s^2
B. 0.5 m/s^2
C. 1 m/s^2
D. 2 m/s^2
Question 12
A block of mass $m$ is placed on a frictionless surface and attached to a horizontal spring with spring cons\tant $k$. The block is displaced by a dis\tance $x$ and released from rest. The resulting simple harmonic motion has a period $T = 2\pi\sqrt{\frac{m}{k}}$. If the mass of the block is doubled and the spring cons\tant is halved, what is the new period?
A. 2\pi\sqrt{\frac{m}{2k}}
B. 2\pi\sqrt{\frac{2m}{k}}
C. 2\pi\sqrt{\frac{m}{k/2}}
D. 2\pi\sqrt{\frac{2m}{2k}}
Question 13
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 14
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?
A. positive x-direction
B. negative x-direction
C. positive y-direction
D. negative y-direction
Question 15
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2

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