POST UTME CALEB UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 2 Ω resistor, a 3 Ω resistor, and a 4 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the circuit?
A. 2 A
B. 3 A
C. 4 A
D. 5 A
Question 2
A parallel plate capacitor consists of two plates of area 0.1 m^2, separated by a dis\tance of 0.01 m. The capaci\tance of the capacitor is 10 nF. If a potential difference of 5 V is applied across the plates, what is the magnitude of the electric field between the plates?
A. 100 V/m
B. 200 V/m
C. 300 V/m
D. 400 V/m
Question 3
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. 2.5 L
B. 5.0 L
C. 7.5 L
D. 10.0 L
Question 4
A car of mass $m$ is traveling at a speed $v$ when it encounters a bump in the road. The car's speed is reduced by a factor of $\frac{1}{2}$ as it passes over the bump. What is the work done by the force of friction on the car?
A. -\frac{1}{2}mv^2
B. \frac{1}{2}mv^2
C. -mv^2
D. mv^2
Question 5
A block of mass 5 kg is moving with a velocity of 2 m/s. If the block is subject to a force of 10 N, what is the acceleration of the block?
A. 0.2 m/s^2
B. 0.5 m/s^2
C. 1 m/s^2
D. 2 m/s^2
Question 6
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The ground state wave function of the particle is given by $psi_0(x) = \sqrt{\frac{2}{L}} \sinleft\( \frac{pi x}{L}\right \)$. What is the expectation value of the position operator in the ground state?
A. 0
B. \frac{L}{2}
C. L
D. \frac{L}{\pi}
Question 7
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. -5 cm
B. 5 cm
C. 10 cm
D. 15 cm
Question 8
A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 2 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. \( \sqrt{2} \) m/s
B. \( \sqrt{4} \) m/s
C. \( \sqrt{6} \) m/s
D. \( \sqrt{8} \) m/s
Question 9
A ray of light passes from air into a glass block at an angle of incidence of 30°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 10
A 5 m long wire is stretched by a force of 20 N. If the Young's modulus of the wire is 2.5 x 10^11 Pa, calculate the extension of the wire.
A. 0.1 m
B. 0.15 m
C. 0.2 m
D. 0.25 m
Question 11
A sound wave with a frequency of 200 Hz and a speed of 340 m/s is traveling through a medium. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 12
A magnetic field is produced by a current-carrying wire. If the current is 5 A and the length of the wire is 2 m, what is the magnetic field strength at a dis\tance of 1 m from the wire?
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 13
A radioactive sample has a half-life of 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?
A. 250 Bq
B. 500 Bq
C. 750 Bq
D. 1000 Bq
Question 14
A gas is contained in a cylinder of volume 2 m³ at a pressure of 1 atm. If the temperature is increased by 10°C, what is the new pressure of the gas?
A. 1.2 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 15
A ray of light passes through a prism of angle 60° and is re\fracted at an angle of 30°. What is the angle of deviation of the ray?
A. 20°
B. 30°
C. 40°
D. 50°

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