POST UTME UNIOSUN 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 2
A current of 2 A flows through a resistor of 10 ohms. Calculate the power dissipated in the resistor.
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 3
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. 1.0 A
B. 2.0 A
C. 3.0 A
D. 4.0 A
Question 4
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. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 5
A parallel plate capacitor has plates of area $A$ and separation $d$. If a dielectric of cons\tant $K$ is inserted between the plates, the capaci\tance of the capacitor becomes $C' = KC$. If the original capaci\tance is $C = \frac{epsilon_0 A}{d}$, find the value of $K$.
A. 1
B. \sqrt{K}
C. K
D. \frac{1}{K}
Question 6
A particle is projected at an angle of 60° to the horizontal with an initial velocity of 25 m/s. What is the time of flight of the particle?
A. 2 s
B. 3 s
C. 4 s
D. 5 s
Question 7
A photon has an energy of 4.8 eV. What is its wavelength?
A. 250 nm
B. 300 nm
C. 350 nm
D. 400 nm
Question 8
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the centripetal force acting on the particle?
A. 16 N
B. 20 N
C. 24 N
D. 28 N
Question 9
A wire of resis\tance 10 Ω is connected in series with a 20 Ω resistor and a 30 Ω resistor. What is the total resis\tance of the circuit?
A. 40 Ω
B. 50 Ω
C. 60 Ω
D. 70 Ω
Question 10
A 10 μF capacitor is charged to a potential difference of 12 V. If the capacitor is then connected to a 5 Ω resistor, calculate the time cons\tant of the circuit.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 11
A light ray is incident on a glass slab at an angle of 60°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.
A. 30°
B. 45°
C. 60°
D. 75°
Question 12
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 8 Ω
B. 10 Ω
C. 12 Ω
D. 14 Ω
Question 13
A nucleus of mass number 238 has a binding energy of 170 MeV. What is the mass defect?
A. 1.0 x 10^-27 kg
B. 1.0 x 10^-26 kg
C. 1.0 x 10^-25 kg
D. 1.0 x 10^-24 kg
Question 14
A radioactive sample of uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, what is the mass of the daughter nucleus after 3 half-lives?
A. 25 g
B. 50 g
C. 12.5 g
D. 75 g
Question 15
A heat engine operates between a source at 500 K and a \sink at 300 K. What is the maximum efficiency of the engine?
A. 0.25
B. 0.30
C. 0.35
D. 0.40

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