POST UTME EKSU 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 W bulb is connected to a 200 V AC source. If the power factor of the bulb is 0.8, what is the current drawn by the bulb?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 2
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. What is the magnitude of the force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 3
A 10 mH inductor is connected in series with a 20 Ω resistor and a 120 V AC source. What is the impedance of the circuit?
A. 22.36 Ω
B. 24.49 Ω
C. 26.63 Ω
D. 28.78 Ω
Question 4
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 on the plates when the potential difference between them is 100 V?
A. 2.5 x 10^-8 C
B. 5 x 10^-8 C
C. 1 x 10^-7 C
D. 2 x 10^-7 C
Question 5
A photon of wavelength 500 nm is incident on a metal surface. If the work function of the metal is 2.0 eV, calculate the kinetic energy of the emitted electron.
A. 1.0 eV
B. 2.0 eV
C. 3.0 eV
D. 4.0 eV
Question 6
A particle of mass 1.0 kg is moving in a circular path with a radius of 2.0 m. If the particle has a speed of 4.0 m/s, calculate the centripetal force acting on the particle.
A. 5.0 N
B. 10 N
C. 20 N
D. 40 N
Question 7
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.5 L, what is the final volume?
A. 3.33 L
B. 4.17 L
C. 5.00 L
D. 6.25 L
Question 8
A 5 kg block is moving with a speed of 2 m/s on a frictionless surface. If a force of 10 N is applied to the block, what is its new speed?
A. 2.5 m/s
B. 3 m/s
C. 4 m/s
D. 5 m/s
Question 9
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 uniform magnetic field of 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 10
A gas expands from 1.0 L to 2.0 L against a cons\tant external pressure of 2.0 atm. Calculate the work done by the gas.
A. 4 J
B. 8 J
C. 16 J
D. 32 J
Question 11
A 10 V battery is connected to a 2 Ω resistor in series with a 4 Ω resistor. What is the current flowing through the 2 Ω resistor?
A. 1.5 A
B. 2 A
C. 2.5 A
D. 3 A
Question 12
A lens has a focal length of 20 cm. An object is placed 30 cm from the lens. What is the image dis\tance?
A. -60 cm
B. -40 cm
C. -20 cm
D. 10 cm
Question 13
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 15 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 14
A gas at 300 K and 1 atm expands from 10 L to 20 L. What is the work done by the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 15
A capacitor is connected in series with a 10 Ω resistor and a 120 V AC source. What is the current through the capacitor?
A. 2.5 A
B. 5.0 A
C. 7.5 A
D. 10 A

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