POST UTME WELLSPRING UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor is connected to a power source. If the frequency of the power source is doubled, what happens to the current through the capacitor?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 2
A 1000 kg car is traveling at a speed of 20 m/s. If the driver applies the brakes and the car comes to a stop in 10 s, what is the average force applied by the brakes?
A. 1000 N
B. 2000 N
C. 3000 N
D. 4000 N
Question 3
A uniform magnetic field of strength 2 T is applied to a rec\tangular coil of dimensions 0.1 m x 0.2 m. If the coil is rotated by 90 degrees about an axis perp\endicular to the plane of the coil, what is the change in magnetic flux through the coil?
A. 0.02 Wb
B. 0.04 Wb
C. 0.06 Wb
D. 0.08 Wb
Question 4
A wave has a frequency of 50 Hz and a wavelength of 0.05 m. Calculate the velocity of the wave.
A. 2.5 m/s
B. 5.0 m/s
C. 7.5 m/s
D. 10.0 m/s
Question 5
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the charge stored when the potential difference is 100 V?
A. 1.25 x 10^-7 C
B. 2.5 x 10^-7 C
C. 5.0 x 10^-7 C
D. 1.0 x 10^-6 C
Question 6
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 7
A 10 kW heater operates on a 230 V supply. Assuming an efficiency of 90%, calculate the current drawn by the heater.
A. 4.35 A
B. 5.35 A
C. 6.35 A
D. 7.35 A
Question 8
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-6 F, what is the charge stored when the potential difference between the plates is 10 V?
A. 4.0 x 10^-5 C
B. 8.0 x 10^-5 C
C. 1.6 x 10^-4 C
D. 3.2 x 10^-4 C
Question 9
A capacitor of capaci\tance 10^-6 F is charged to a potential difference of 100 V. If it is connected to a resistor of resis\tance 1000 ohms, what is the time cons\tant?
A. 0.01 s
B. 0.1 s
C. 1.0 s
D. 10 s
Question 10
A body of mass 5.0 kg is moving with a velocity of 20 m/s. If it is subjected to a force of 10 N, what is the acceleration?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 5.0 m/s^2
Question 11
A 2 kg block is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the potential energy stored in the spring?
A. 2 J
B. 4 J
C. 6 J
D. 8 J
Question 12
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in parallel. If a voltage of 12 V is applied across the circuit, calculate the current drawn by the 10 Ω resistor.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 13
A ray of light 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. 18°
B. 20°
C. 22°
D. 25°
Question 14
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 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, calculate the maximum speed of the block.
A. \( 2\sqrt{10} \) m/s
B. \( 4\sqrt{10} \) m/s
C. \( 6\sqrt{10} \) m/s
D. \( 8\sqrt{10} \) m/s
Question 15
A heat engine operates between the temperatures 300 K and 600 K. If it has an efficiency of 30%, what is the maximum possible work output?
A. 100 J
B. 200 J
C. 300 J
D. 400 J

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