POST UTME KSU 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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, calculate the kinetic energy of the block after 1 second.
A. ( 10.0 J )
B. ( 20.0 J )
C. ( 30.0 J )
D. ( 40.0 J )
Question 2
A 10 V AC source is connected to a 20 Ω resistor and a 10 μF capacitor in series. The frequency of the AC source is 50 Hz. Determine the impedance of the circuit.
A. 30 Ω
B. 40 Ω
C. 50 Ω
D. 60 Ω
Question 3
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 nF. If a potential difference of 10 V is applied across the plates, what is the magnitude of the displacement current?
A. 0.5 A
B. 1.0 A
C. 2.0 A
D. 5.0 A
Question 4
A gas expands from an initial volume of 0.5 m^3 to a final volume of 1.5 m^3 at a cons\tant temperature of 300 K. Determine the work done by the gas during this expansion.
A. -450 J
B. -600 J
C. -750 J
D. -900 J
Question 5
A block of mass 2 kg is attached to a horizontal, massless spring with a spring cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, determine the maximum speed of the block.
A. 1.6 m/s
B. 2.0 m/s
C. 2.5 m/s
D. 3.2 m/s
Question 6
A magnetic field of 2 T is directed along the z-axis. A current of 5 A is flowing in a wire loop of radius 2 m. Calculate the magnitude of the magnetic moment of the loop.
A. 10 A·m^2
B. 20 A·m^2
C. 30 A·m^2
D. 40 A·m^2
Question 7
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 2.5 A
B. 5 A
C. 10 A
D. 20 A
Question 8
A body of mass 5 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 2 m, calculate the centripetal force acting on the body.
A. 20 N
B. 40 N
C. 60 N
D. 80 N
Question 9
A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the lens is used to form an image of the light source, what is the position of the image?
A. 1.5 m
B. 2 m
C. 2.5 m
D. 3 m
Question 10
A 2.0 mH inductor is connected in series with a 10 V AC source. If the frequency of the source is 100 Hz, calculate the inductive reac\tance of the inductor.
A. ( 10.0 Omega )
B. ( 20.0 Omega )
C. ( 50.0 Omega )
D. ( 100.0 Omega )
Question 11
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, calculate the activity after 10 years.
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 12
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. Calculate the maximum height reached by the projectile.
A. 10 m
B. 20 m
C. 30 m
D. 40 m
Question 13
A magnetic field of 0.5 T is applied to a coil of 50 turns and radius 0.1 m. If the current in the coil is 2 A, what is the magnitude of the torque experienced by the coil?
A. 0.05 Nm
B. 0.1 Nm
C. 0.2 Nm
D. 0.5 Nm
Question 14
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. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 15
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. What is the total resis\tance?
A. 2 Ω
B. 3 Ω
C. 4 Ω
D. 6 Ω

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