POST UTME KSU 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. Find the focal length of the combination.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 2
A capacitor consists of two parallel plates of area 0.1 m^2 and separation 0.01 m. If the capaci\tance is 10 nF, what is the charge stored when the potential difference is 5 V?
A. ( 0.05 ) C
B. ( 0.1 ) C
C. ( 0.15 ) C
D. ( 0.2 ) C
Question 3
A gas at 300 K and 1 atm expands to 2 atm. What is the new temperature of the gas?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 4
A current of 5 A flows through a resistor of 10 Ω. If the voltage across the resistor is 20 V, what is the power dissipated by the resistor?
A. 50 W
B. 100 W
C. 200 W
D. 500 W
Question 5
A radioactive sample of Uranium-238 has a half-life of 4.5 billion years. If the initial activity of the sample is 100 Bq, what is the activity after 9 billion years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 6
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. Find the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 7
A light ray passes from air into a glass slab of thickness t and re\fractive index n. If the angle of incidence is θ, what is the angle of re\fraction?
A. \sin^{-1} \frac{n}{n_{air}} \sin \theta'
B. \sin^{-1} \frac{n_{air}}{n} \sin \theta'
C. \sin^{-1} \frac{n}{n_{air}} \cos \theta'
D. \sin^{-1} \frac{n_{air}}{n} \cos \theta'
Question 8
A magnetic field of 0.5 T is applied to a coil of wire with 100 turns. If the coil has a resis\tance of 10 Ω, what is the induced emf?
A. 0.5 V
B. 5 V
C. 10 V
D. 50 V
Question 9
A particle of charge 2 μC is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. What is the magnitude of the magnetic field at the center of the circle?
A. 10^-4 T
B. 10^-3 T
C. 10^-2 T
D. 10^-1 T
Question 10
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2 L and the final volume is 4 L, what is the change in internal energy?
A. ( 1000 ) J
B. ( 2000 ) J
C. ( 3000 ) J
D. ( 4000 ) J
Question 11
A light source is placed at a dis\tance of 2 m from a convex lens of focal length 0.5 m. If the image is formed at a dis\tance of 3 m from the lens, what is the magnification?
A. ( 2 )
B. ( 3 )
C. ( 4 )
D. ( 5 )
Question 12
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a uniform magnetic field of strength 1 T, what is the magnitude of the magnetic force acting on the particle?
A. 3 N
B. 6 N
C. 12 N
D. 24 N
Question 13
A simple p\endulum has a length of 1.0 m and a mass of 0.1 kg. If it is displaced by an angle of 30° from its equilibrium position, what is the period of oscillation?
A. 1.0 s
B. 2.0 s
C. 3.0 s
D. 4.0 s
Question 14
A parallel plate capacitor has a capaci\tance of 10 µF. If a potential difference of 100 V is applied across it, what is the charge stored?
A. 10 µC
B. 100 µC
C. 1000 µC
D. 10000 µC
Question 15
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the plates are then separated by a dis\tance of 5 cm, what is the new capaci\tance?
A. 2 μF
B. 5 μF
C. 10 μF
D. 20 μF

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