POST UTME UNN 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 2
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the time taken for the particle to return to its equilibrium position.
A. 1.57 s
B. 2.12 s
C. 3.14 s
D. 4.19 s
Question 3
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. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 4
A gas is contained in a cylinder of volume 2 L. If the temperature of the gas is increased from 300 K to 400 K, what is the new volume of the gas?
A. 2.5 L
B. 3 L
C. 3.5 L
D. 4 L
Question 5
A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 minutes, what is the activity of the sample after 20 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 6
A light ray passes from air into a glass of re\fractive index 1.50. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 7
A 5 kg block is attached to a horizontal, massless 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, calculate the maximum speed of the block.
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
Question 8
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. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 9
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a centripetal force $F_c = \frac{mv^2}{r}$, what is the magnitude of the acceleration of the particle?
A. \frac{v^2}{r}
B. \frac{mv^2}{r}
C. \frac{v}{r}
D. \frac{m}{r}
Question 10
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 11
A particle of mass 2 kg is moving in a circular path of radius 1 m with a speed of 4 m/s. What is the magnitude of the centripetal acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
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. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 13
A projectile is launched from the ground with an initial velocity of $v_0 = 20 m/s$ at an angle of $\theta = 30^\circ$ above the horizontal. What is the maximum height reached by the projectile?
A. 5 m
B. 10 m
C. 15 m
D. 20 m
Question 14
A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. The capaci\tance is 10 nF. Calculate the electric field between the plates.
A. 1 kV/m
B. 2 kV/m
C. 3 kV/m
D. 4 kV/m
Question 15
A beam of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°

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