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POST UTME BSU 2018 Physics | Objective

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Question 1 View Details

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 5 V is applied across the plates, calculate the charge stored on the capacitor.

A. 50 μC

Correct B. 100 μC

C. 200 μC

D. 500 μC

Correct Answer: B

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Question 2 View Details

A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle completes one revolution in 4 s, calculate the angular velocity of the particle.

A. 0.5 rad/s

B. 1.0 rad/s

Correct C. 2.0 rad/s

D. 4.0 rad/s

Correct Answer: C

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Question 3 View Details

A block of mass 5 kg is placed on a horizontal surface. If a force of 10 N is applied to the block, calculate the acceleration of the block.

A. 0.5 m/s^2

B. 1.0 m/s^2

C. 2.0 m/s^2

Correct D. 5.0 m/s^2

Correct Answer: D

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Question 4 View Details

A container of volume 2 m^3 is filled with water. If the density of water is 1000 kg/m^3, calculate the mass of the water in the container.

Correct A. 2000 kg

B. 4000 kg

C. 6000 kg

D. 8000 kg

Correct Answer: A

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Question 5 View Details

A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 2 hours, calculate the activity of the sample after 4 hours.

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 6 View Details

A light ray passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?

A. 20°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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Question 7 View Details

A sound wave has a frequency of 200 Hz and a speed of 340 m/s. What is the wavelength of the wave?

Correct A. 1.7 m

B. 1.8 m

C. 1.9 m

D. 2.0 m

Correct Answer: A

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Question 8 View Details

A capacitor consists of two parallel plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. If the potential difference between the plates is 10 V, what is the capaci\tance?

A. 0.01 F

Correct B. 0.02 F

C. 0.03 F

D. 0.04 F

Correct Answer: B

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Question 9 View Details

A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 0.1 m, what is the magnetic field strength?

A. 0.02 T

Correct B. 0.03 T

C. 0.04 T

D. 0.05 T

Correct Answer: B

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Question 10 View Details

A gas is contained in a cylinder of volume 0.1 m^3. If the pressure is 100 kPa and the temperature is 300 K, what is the number of moles of gas?

A. 0.01 mol

Correct B. 0.02 mol

C. 0.03 mol

D. 0.04 mol

Correct Answer: B

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Question 11 View Details

A particle of mass 0.5 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.

A. 10 rad/s

Correct B. 20 rad/s

C. 30 rad/s

D. 40 rad/s

Correct Answer: B

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Question 12 View Details

A 10 μF capacitor is connected in series with a 20 Ω resistor and a 100 V battery. Calculate the time cons\tant of the circuit.

A. 2 s

Correct B. 4 s

C. 6 s

D. 8 s

Correct Answer: B

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Question 13 View Details

A \tank contains 100 L of water at a pressure of 1 atm. A pump is used to increase the pressure to 2 atm. Calculate the work done by the pump.

A. 100 J

Correct B. 200 J

C. 300 J

D. 400 J

Correct Answer: B

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Question 14 View Details

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. Calculate the maximum height reached by the projectile.

A. 10 m

Correct B. 20 m

C. 30 m

D. 40 m

Correct Answer: B

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Question 15 View Details

A gas is compressed from an initial volume of 10 L to a final volume of 5 L at a cons\tant temperature of 300 K. Calculate the work done on the gas.

A. -50 J

Correct B. -100 J

C. -150 J

D. -200 J

Correct Answer: B

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Question 16 View Details

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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?

A. 10 N

B. 12 N

Correct C. 15 N

D. 18 N

Correct Answer: C

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Question 17 View Details

A 12 V battery is connected to a 4 Ω resistor in series with a 6 Ω resistor. What is the current flowing through the 4 Ω resistor?

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 18 View Details

A 100 g block of ice at 0°C is placed in a 200 g block of water at 80°C. What is the final temperature of the mixture?

A. 10°C

B. 20°C

Correct C. 30°C

D. 40°C

Correct Answer: C

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Question 19 View Details

A 2 kg object is moving in a circular path of radius 4 m with a cons\tant speed of 5 m/s. If the object is subjected to a centripetal acceleration of 3 m/s^2, what is the magnitude of the force acting on the object?

A. 20 N

B. 25 N

Correct C. 30 N

D. 35 N

Correct Answer: C

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Question 20 View Details

A 10 V battery is connected to a 2 Ω resistor in series with a 3 Ω resistor. What is the current flowing through the 2 Ω resistor?

A. 1.5 A

Correct B. 2 A

C. 2.5 A

D. 3 A

Correct Answer: B

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Question 21 View Details

A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 10 days?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

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Question 22 View Details

A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 1.0 m/s

B. 2.0 m/s

Correct C. 4.0 m/s

D. 8.0 m/s

Correct Answer: C

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Question 23 View Details

A heat engine operates between two reservoirs at temperatures 500 K and 300 K. If the engine receives 100 J of heat from the high-temperature reservoir, what is the efficiency of the engine?

A. 0.25

B. 0.33

C. 0.50

Correct D. 0.67

Correct Answer: D

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Question 24 View Details

A 5 kg object is susp\ended from a spring with a force cons\tant of 200 N/m. If the object is displaced by 0.1 m from its equilibrium position, what is the potential energy stored in the spring?

A. 2.5 J

B. 5.0 J

Correct C. 10.0 J

D. 20.0 J

Correct Answer: C

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Question 25 View Details

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. What is the equivalent resis\tance of the circuit?

A. 10 Ω

B. 20 Ω

C. 30 Ω

Correct D. 60 Ω

Correct Answer: D

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