POST UTME CRAWFORD UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 5.0 kg block is moving in a circular path with a radius of 2.0 m at a speed of 4.0 m/s. What is the centripetal acceleration?
A. 4.0 m/s^2
B. 4.0 m/s^2
C. 4.0 m/s^2
D. 4.0 m/s^2
Question 2
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. What is the magnification of the image?
A. 0.5
B. 1
C. 2
D. 3
Question 3
A particle of mass 0.1 kg is attached to a spring with spring cons\tant 10 N/m. If it is displaced by 0.2 m from its equilibrium position and released, what is its angular frequency?
A. 1.4 rad/s
B. 2.8 rad/s
C. 4.2 rad/s
D. 5.6 rad/s
Question 4
A parallel-plate capacitor has a capaci\tance of 5.0 µF and is charged to a potential difference of 10 V. If the dis\tance between the plates is doubled, what is the new potential difference?
A. 5.0 V
B. 5.0 V
C. 5.0 V
D. 5.0 V
Question 5
A radioactive sample of Uranium-238 emits an \alpha particle and then undergoes \beta decay. What is the resulting nucleus?
A. Thallium-234
B. Thorium-234
C. Radium-226
D. Actinium-227
Question 6
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. The block is displaced by 0.2 m from its equilibrium position and then 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 7
A capacitor of capaci\tance 4 μF is charged to a potential difference of 120 V. If the capacitor is then connected across a 10 Ω resistor, calculate the time taken by the capacitor to discharge to 50% of its initial charge.
A. 0.1 s
B. 0.2 s
C. 0.3 s
D. 0.4 s
Question 8
A particle of mass 2 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, determine the angular frequency of the resulting simple harmonic motion.
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 9
A long solenoid of length 0.5 m has 200 turns per meter. If a current of 2 A flows through it, what is the magnetic field at its center?
A. 0.2 T
B. 0.4 T
C. 0.6 T
D. 0.8 T
Question 10
A magnetic field of 0.5 T is directed perp\endicular to a wire of length 2 m and cross-sectional area 0.01 m^2. If the current in the wire is 5 A, what is the force exerted on the wire?
A. 0.25 N
B. 0.5 N
C. 1.0 N
D. 2.0 N
Question 11
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a speed $v$. Determine the centripetal force $F_c$ required to maintain the particle in its orbit.
A. F_c = \frac{mv^2}{r}
B. F_c = \frac{mr^2}{v^2}
C. F_c = \frac{v^2}{mr}
D. F_c = \frac{r^2}{mv^2}
Question 12
A 2 kg block is attached to a horizontal, massless spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, determine the total energy of the system after 2 s.
A. 20 J
B. 30 J
C. 40 J
D. 50 J
Question 13
A 2 μF capacitor is connected in series with a 3 Ω resistor and a 120 V AC source. If the frequency of the source is 50 Hz, calculate the current flowing through the circuit.
A. 0.5 A
B. 1 A
C. 2 A
D. 3 A
Question 14
A capacitor of capaci\tance 6 μF is connected in parallel with a 4 μF capacitor. If a potential difference of 150 V is applied across the combination, calculate the charge on the 6 μF capacitor.
A. 0.1 C
B. 0.2 C
C. 0.3 C
D. 0.4 C
Question 15
A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s

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