POST UTME ACHIEVERS UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 1 kg is moving in a circular path of radius 1 m with a cons\tant speed of 1 m/s. What is the magnitude of the net force acting on the particle?
A. 1 N
B. 2 N
C. 3 N
D. 4 N
Question 2
A wave has a frequency of 100 Hz and a wavelength of 0.1 m. If the wave is traveling in a medium with a speed of 200 m/s, what is the amplitude of the wave?
A. 0.01 m
B. 0.02 m
C. 0.03 m
D. 0.04 m
Question 3
A container of volume 10 L is filled with a gas at a pressure of 2 atm. If the temperature of the gas is increased by 20°C, what is the new pressure of the gas?
A. 2.5 atm
B. 3 atm
C. 3.5 atm
D. 4 atm
Question 4
A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, calculate the time taken for the block to reach its maximum speed.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 5
A 10 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 6
A magnetic field is produced by a current-carrying wire. If the current is tripled, what happens to the magnetic field?
Question 7
A 10.0 V battery is connected to a 2.00 kΩ resistor in series with a 3.00 μF capacitor. Calculate the time cons\tant of the RC circuit.
A. \( 6.00 , \text{ms} \)
B. \( 12.0 , \text{ms} \)
C. \( 20.0 , \text{ms} \)
D. \( 60.0 , \text{ms} \)
Question 8
A 20.0 Ω resistor is connected in parallel with a 10.0 Ω resistor. What is the equivalent resis\tance of the circuit?
A. ( 5.00 , Omega )
B. ( 10.0 , Omega )
C. ( 15.0 , Omega )
D. ( 20.0 , Omega )
Question 9
A beam of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 10
A charged particle of mass $m$ and charge $q$ is moving in a circular path of radius $r$ in a uniform magnetic field of strength $B$. If the particle's speed is $v$, what is the magnitude of the magnetic field required to keep the particle in a circular path?
A. B = \frac{mv}{qr}
B. B = \frac{qr}{mv}
C. B = \frac{mv^2}{qr}
D. B = \frac{qr^2}{mv}
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 10 m
B. 20 m
C. 30 m
D. 40 m
Question 12
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 20 years?
A. 10 Bq
B. 20 Bq
C. 40 Bq
D. 50 Bq
Question 13
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.2 m/s
B. 0.4 m/s
C. 0.6 m/s
D. 0.8 m/s
Question 14
A 100 Ω resistor is connected in parallel with a 200 Ω resistor. If a potential difference of 20 V is applied across the combination, calculate the current flowing through the 100 Ω resistor.
Question 15
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -30 cm. A parallel beam of light is incident on the combination. Find the position of the image formed by the combination.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm

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