POST UTME KSU 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg block of metal is heated from 20°C to 80°C. If the specific heat capacity of the metal is 0.5 kJ/kg°C, calculate the heat energy transferred to the block.
A. 400 J
B. 800 J
C. 1200 J
D. 1600 J
Question 2
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, calculate the maximum speed of the particle.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 3
A current of 5 A flows through a resistor of 10 Ω. What is the power dissipated by the resistor?
A. 25 W
B. 50 W
C. 75 W
D. 100 W
Question 4
A ray of light passes through a prism and is re\fracted at an angle of 30°. If the angle of incidence is 20°, what is the angle of emergence?
A. 10°
B. 20°
C. 30°
D. 40°
Question 5
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 12 V battery is connected across the circuit, what is the total resis\tance of the circuit?
A. 60 Ω
B. 80 Ω
C. 100 Ω
D. 120 Ω
Question 6
A gas is heated from 300 K to 400 K. What is the ratio of the final volume to the initial volume?
A. 1.33
B. 1.5
C. 1.67
D. 2
Question 7
A radioactive sample emits \alpha particles with a half-life of 4.5 years. If the initial activity is 100 Bq, what is the activity after 18 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 8
A 2.5 m long wire of resis\tance 5 Ω is connected in series with a 10 V battery. If the wire is stretched to 3.5 m, what is the new resis\tance?
A. 7.5 Ω
B. 10 Ω
C. 12.5 Ω
D. 15 Ω
Question 9
A projectile is launched at an angle of 60° to the horizontal with an initial velocity of 20 m/s. If the acceleration due to gravity is 9.8 m/s^2, find the maximum height reached by the projectile.
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 10
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine has an efficiency of 30%, calculate the work done per cycle.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 11
A simple harmonic motion has a maximum displacement of 2 m and a frequency of 3 Hz. What is the angular frequency?
A. 6 rad/s
B. 12 rad/s
C. 18 rad/s
D. 24 rad/s
Question 12
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 particle's speed is doubled, what is the new centripetal force required to keep the particle in its circular path?
A. 2mv^2/R
B. 4mv^2/R
C. mv^2/R
D. mv^2/2R
Question 13
A parallel plate capacitor has a capaci\tance of 10 μF. If a voltage of 20 V is applied across it, what is the energy stored in the capacitor?
A. 0.2 J
B. 0.4 J
C. 0.6 J
D. 0.8 J
Question 14
A light ray 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. 30°
C. 40°
D. 50°
Question 15
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N

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