POST UTME NOUN 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A heat engine operates between the temperatures 300 K and 600 K. If the efficiency of the engine is 30%, calculate the work done per cycle.
A. 100 J
B. 200 J
C. 500 J
D. 1000 J
Question 2
A particle of mass m is moving in a circular path of radius r with a cons\tant speed v. What is the magnitude of the centripetal force acting on the particle?
A. mv^2/r
B. mv/r
C. mv^2
D. mv
Question 3
A gas at pressure P1 and volume V1 is heated to a temperature T2. If the final pressure is P2 and the final volume is V2, what is the ratio of the initial and final pressures?
A. P1/P2
B. P2/P1
C. V1/V2
D. V2/V1
Question 4
A light wave has a frequency f and a wavelength λ. What is the speed of the light wave?
A. fλ
B. f/λ
C. λ/f
D. λ
Question 5
A spring with a spring cons\tant of 100 N/m is stretched by 0.5 m. What is the potential energy stored in the spring?
A. 12.5 J
B. 25 J
C. 37.5 J
D. 50 J
Question 6
A heat engine operates between the temperatures of 500 K and 300 K. If the engine absorbs 1000 J of heat energy from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 7
A lens of focal length 0.2 m is placed in a beam of light. If the object dis\tance is 0.5 m, calculate the image dis\tance.
A. -0.1 m
B. -0.2 m
C. -0.3 m
D. -0.4 m
Question 8
A 10 μF capacitor is connected in series with a 5 kΩ resistor. If the supply voltage is 20 V, calculate the time cons\tant of the circuit.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 9
A projectile is launched from the ground with an initial velocity of 20.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the projectile?
A. 5.0 m
B. 10.0 m
C. 15.0 m
D. 20.0 m
Question 10
A body of mass 2 kg is moving with a velocity of 5 m/s. If the force applied to the body is 10 N, calculate the acceleration of the body.
A. 0.5 m/s²
B. 1 m/s²
C. 2 m/s²
D. 5 m/s²
Question 11
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 12
A solid cylindrical block of wood has a radius of 0.05 m and a height of 0.2 m. If the density of the wood is 500 kg/m³, calculate the pressure at the bottom of the block when it is submerged in water.
A. 1000 Pa
B. 2000 Pa
C. 5000 Pa
D. 10000 Pa
Question 13
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. Calculate the speed of the sound wave.
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s
Question 14
A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 200 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. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 15
A quantum particle has a wave function given by ψ(x) = Ae^\( -αx^2 \). What is the probability density of the particle?
A. A^2e^\( -2αx^2 \)
B. A^2e^\( -αx^2 \)
C. A^2e^\( αx^2 \)
D. A^2e^\( -2αx^2 \)

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