POST UTME UNILAG 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas is heated from 20°C to 80°C at cons\tant volume. What is the change in internal energy?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 2
A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor with an induc\tance of 0.5 H. The circuit is closed at time t = 0. Assuming the current is zero at t = 0, calculate the current in the circuit at time t = 2 s.
A. 0.5 A
B. 1 A
C. 2 A
D. 3 A
Question 3
A particle of mass 2 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. If the acceleration due to gravity is 9.8 m/s², calculate the time taken for the particle to reach its maximum height.
A. 2.5 s
B. 3.0 s
C. 3.5 s
D. 4.0 s
Question 4
A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If it experiences a cons\tant acceleration of 2 m/s^2, what is its velocity after 3 seconds?
A. 7 m/s
B. 8 m/s
C. 9 m/s
D. 10 m/s
Question 5
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of the sound wave?
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s
Question 6
A ray of light passes from air into a glass slab. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 7
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 force?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 8
A heat engine operates between two heat reservoirs at temperatures $T_1 = 500,K$ and $T_2 = 300,K$. If the engine produces 500,J of work in one cycle, what is its efficiency?
A. 0.4
B. 0.6
C. 0.8
D. 0.9
Question 9
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. 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 10
A convex lens of focal length $f = 20,cm$ forms an image of an object at a dis\tance $u = 30,cm$ from the lens. What is the magnification of the image?
A. M = -0.5
B. M = -1
C. M = -1.5
D. M = -2
Question 11
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the total energy of the particle at time t = 0.
A. 10 J
B. 20 J
C. 25 J
D. 30 J
Question 12
A particle of mass $m$ moves in a circular path of radius $R$ with a cons\tant speed $v$. If the particle experiences a centripetal acceleration of $a_c = \frac{v^2}{R}$, what is the force acting on the particle?
A. F = \frac{mv^2}{R}
B. F = \frac{mv^2}{R^2}
C. F = \frac{mv^2}{R^3}
D. F = \frac{mv^2}{R^4}
Question 13
A body of mass 8 kg is moving in a circular path with a radius of 4 m. If the body is subject to a centripetal force of 20 N, calculate the speed of the body.
A. 2.0 m/s
B. 4.0 m/s
C. 6.0 m/s
D. 8.0 m/s
Question 14
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 250 Bq
B. 500 Bq
C. 750 Bq
D. 1000 Bq
Question 15
A particle of mass 1 kg is moving in a circular path with a radius of 2 m. The particle is moving at a speed of 4 m/s. Calculate the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N

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