POST UTME CRAWFORD UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 subjected to a centripetal force of 12 N, determine the angle between the force and the radius vector.
A. 45°
B. 60°
C. 75°
D. 90°
Question 2
A radioactive subs\tance has a half-life of 2 years. If 100 g of the subs\tance is initially present, how much will remain after 6 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 3
A 2 kg object is moving at 5 m/s. What is its kinetic energy?
A. 12.5 J
B. 25 J
C. 50 J
D. 100 J
Question 4
A beam of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, calculate the angle of deviation.
A. 10°
B. 20°
C. 30°
D. 40°
Question 5
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?
A. 20 m
B. 32.9 m
C. 50 m
D. 80 m
Question 6
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. Determine the maximum height reached by the projectile.
A. 5 m
B. 10 m
C. 15 m
D. 20 m
Question 7
A block of mass 2 kg is attached to a horizontal spring with spring cons\tant 100 N/m. If the block is displaced by 0.1 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 8
A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 minutes, what is the activity of the sample after 20 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 9
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-10 F, what is the charge stored when the potential difference between the plates is 10 V?
A. 4.0 x 10^-9 C
B. 8.0 x 10^-9 C
C. 1.6 x 10^-8 C
D. 3.2 x 10^-8 C
Question 10
A magnetic field of 0.5 T is applied to a current-carrying wire of length 2 m. If the current in the wire is 5 A, what is the magnitude of the force experienced by the wire?
A. 0.5 N
B. 1 N
C. 2 N
D. 5 N
Question 11
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.
A. 5 rad/s
B. 10 rad/s
C. 15 rad/s
D. 20 rad/s
Question 12
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 subjected 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
Question 13
A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10 nF, determine the charge stored on the capacitor when a potential difference of 5 V is applied across it.
A. 5 x 10^-8 C
B. 1 x 10^-7 C
C. 2 x 10^-7 C
D. 3 x 10^-7 C
Question 14
A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 15
A 50 Ω resistor is connected to a 100 V AC source. What is the impedance?
A. 50 Ω
B. 70.7 Ω
C. 100 Ω
D. 141.4 Ω

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