POST UTME LAUTECH 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 g block of ice at 0°C is placed in a 200 g block of water at 80°C. What is the final temperature of the mixture?
A. 20°C
B. 30°C
C. 40°C
D. 50°C
Question 2
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If 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
Question 3
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 4
A body cools from 80°C to 60°C in 5 minutes. If the temperature of the surroundings is 20°C, calculate the time taken for the body to cool from 60°C to 40°C.
A. 10 minutes
B. 15 minutes
C. 20 minutes
D. 25 minutes
Question 5
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1.2 A
Question 6
A 10 mH inductor and a 5 μF capacitor are connected in series across a 20 V AC source. If the frequency of the source is 50 Hz, calculate the impedance of the circuit.
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 7
A particle is moving in a circular path with a cons\tant speed of 5 m/s. If the radius of the path is 2 m, what is the magnitude of the centripetal force acting on the particle?
A. 5 N
B. 10 N
C. 15 N
D. 20 N
Question 8
A uniform magnetic field of strength 2.0 T is applied to a coil of wire with 50 turns. If the coil has a radius of 0.05 m and a resis\tance of 5.0 Ω, what is the induced emf when the coil is rotated at a rate of 10 rad/s?
A. 0.5 V
B. 1.0 V
C. 2.0 V
D. 5.0 V
Question 9
A 10 kg block is moving in a circular path with a cons\tant speed of 5 m/s. If the radius of the path is 2 m, what is the magnitude of the force acting on the block?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 10
A particle of mass 2 kg is projected from the origin with an initial velocity of 10 m/s at an angle of 60° to the horizontal. Find the time of flight.
A. 2 s
B. 3 s
C. 4 s
D. 5 s
Question 11
A sound wave with a frequency of 200 Hz and a speed of 340 m/s is reflected from a wall. If the dis\tance between the source and the wall is 10 m, calculate the time taken for the sound wave to return to the source.
A. 0.1 s
B. 0.2 s
C. 0.3 s
D. 0.4 s
Question 12
A 20 kg block is moving with a speed of 10 m/s. If the block is subject to a force of 50 N, what is the acceleration of the block?
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 13
A 5.0 kg object is moving in a circular path with a radius of 2.0 m. If the object has a speed of 4.0 m/s, what is the centripetal force acting on the object?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 14
A 10 μF capacitor is connected in parallel with a 100 μF capacitor. What is the equivalent capaci\tance of the circuit?
A. 10 μF
B. 20 μF
C. 50 μF
D. 100 μF
Question 15
A 50 kg person is s\tanding on a scale that reads 500 N. If the person is then placed in a lift that accelerates downward at 2 m/s², what is the new reading on the scale?
A. 450 N
B. 400 N
C. 350 N
D. 300 N

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