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POST UTME BABCOCK UNIVERSITY 2020 Physics | Objective

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Question 1 View Details

A solid cylindrical rod of radius 5 cm and length 20 cm is subjected to a tensile force of 100 N. If the Young's modulus of the material is 2.0 x 10^11 N/m^2, what is the increase in length of the rod?

A. 0.02 m

Correct B. 0.04 m

C. 0.06 m

D. 0.08 m

Correct Answer: B

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Question 2 View Details

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the energy stored in the capacitor?

A. 0.2 J

Correct B. 0.4 J

C. 0.6 J

D. 0.8 J

Correct Answer: B

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Question 3 View Details

A sound wave with frequency 200 Hz and amplitude 0.5 m is traveling through a medium with speed 340 m/s. What is the intensity of the sound wave?

A. 0.1 W/m^2

Correct B. 0.2 W/m^2

C. 0.3 W/m^2

D. 0.4 W/m^2

Correct Answer: B

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Question 4 View Details

A ray of light passes through a prism with angle of incidence 30° and angle of re\fraction 20°. What is the angle of deviation?

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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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 10 minutes, what is the activity after 20 minutes?

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 2.0 μF capacitor is connected in series with a 3.0 kΩ resistor and a 9.0 V battery. If the switch is closed at t = 0, calculate the charge on the capacitor after 5.0 ms.

A. 0.018 C

Correct B. 0.036 C

C. 0.054 C

D. 0.072 C

Correct Answer: B

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Question 7 View Details

A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the particle.

A. 0.5 m/s

B. 1.0 m/s

Correct C. 1.5 m/s

D. 2.0 m/s

Correct Answer: C

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Question 8 View Details

A 100 W light bulb is connected to a 120 V power source. If the bulb is turned on for 2 hours, calculate the total energy consumed by the bulb.

A. 2.4 kWh

Correct B. 4.8 kWh

C. 6.0 kWh

D. 8.0 kWh

Correct Answer: B

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Question 9 View Details

A wave with a frequency of 50 Hz and a wavelength of 2.0 m is traveling through a medium. If the wave is reflected off a wall, calculate the frequency of the reflected wave.

A. 25 Hz

Correct B. 50 Hz

C. 75 Hz

D. 100 Hz

Correct Answer: B

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Question 10 View Details

A 10 μF capacitor is connected in parallel with a 5 μF capacitor. If a 12 V battery is connected across the capacitors, calculate the equivalent capaci\tance of the circuit.

A. 5 μF

B. 10 μF

Correct C. 15 μF

D. 20 μF

Correct Answer: C

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Question 11 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 subject to a centripetal force of 12 N, what is the magnitude of the force?

A. 8 N

Correct B. 12 N

C. 16 N

D. 24 N

Correct Answer: B

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Question 12 View Details

A capacitor of capaci\tance 5 μF is connected in series with a resistor of resis\tance 10 Ω. If a voltage of 20 V is applied across the circuit, what is the current flowing through the circuit?

A. 2 mA

B. 4 mA

Correct C. 6 mA

D. 8 mA

Correct Answer: C

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Question 13 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. If the air resis\tance is negligible, what is the maximum height reached by the projectile?

A. 10 m

B. 15 m

Correct C. 20 m

D. 25 m

Correct Answer: C

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Question 14 View Details

A wire of resis\tance 5 Ω is connected in parallel with a wire of resis\tance 10 Ω. If a voltage of 15 V is applied across the circuit, what is the total current flowing through the circuit?

A. 3 A

B. 4 A

Correct C. 5 A

D. 6 A

Correct Answer: C

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Question 15 View Details

A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 30 V is applied across the circuit, what is the time cons\tant of the circuit?

A. 0.2 s

B. 0.4 s

Correct C. 0.6 s

D. 0.8 s

Correct Answer: C

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Question 16 View Details

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the particle is subject to a centripetal force of 10 N, what is the magnitude of the force?

A. 5 N

Correct B. 10 N

C. 15 N

D. 20 N

Correct Answer: B

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Question 17 View Details

A capacitor of capaci\tance 20 μF is connected in series with a resistor of resis\tance 15 Ω. If a voltage of 40 V is applied across the circuit, what is the current flowing through the circuit?

A. 2.67 A

B. 3.33 A

Correct C. 4 A

D. 5 A

Correct Answer: C

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Question 18 View Details

A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. If the particle is subject to a centripetal force of 10.0 N, what is the magnitude of the acceleration of the particle?

A. 12.0 m/s^2

Correct B. 8.0 m/s^2

C. 6.0 m/s^2

D. 4.0 m/s^2

Correct Answer: B

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Question 19 View Details

A capacitor consists of two parallel plates, each of area 0.02 m^2, separated by a dis\tance of 0.005 m. If the capaci\tance of the capacitor is 100 nF, what is the magnitude of the electric field between the plates?

A. 2000 V/m

Correct B. 1000 V/m

C. 500 V/m

D. 250 V/m

Correct Answer: B

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Question 20 View Details

A gas is confined to a cylinder of volume 0.05 m^3. If the gas is heated, cau\sing its temperature to increase by 20 K, what is the magnitude of the change in pressure?

A. 100 Pa

Correct B. 200 Pa

C. 300 Pa

D. 400 Pa

Correct Answer: B

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Question 21 View Details

A coil of wire consists of 100 turns, each with an area of 0.01 m^2. If the coil is placed in a magnetic field of magnitude 0.5 T, what is the magnitude of the induced emf?

A. 0.5 V

Correct B. 1.0 V

C. 1.5 V

D. 2.0 V

Correct Answer: B

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Question 22 View Details

A particle of mass 1.0 kg is moving in a circular path of radius 2.0 m with a cons\tant speed of 3.0 m/s. If the particle is subject to a centripetal force of 5.0 N, what is the magnitude of the acceleration of the particle?

A. 10.0 m/s^2

Correct B. 8.0 m/s^2

C. 6.0 m/s^2

D. 4.0 m/s^2

Correct Answer: B

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Question 23 View Details

A capacitor consists of two parallel plates, each of area 0.01 m^2, separated by a dis\tance of 0.002 m. If the capaci\tance of the capacitor is 50 nF, what is the magnitude of the electric field between the plates?

A. 1000 V/m

Correct B. 500 V/m

C. 250 V/m

D. 125 V/m

Correct Answer: B

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Question 24 View Details

A gas is confined to a cylinder of volume 0.02 m^3. If the gas is heated, cau\sing its temperature to increase by 10 K, what is the magnitude of the change in pressure?

A. 50 Pa

Correct B. 100 Pa

C. 150 Pa

D. 200 Pa

Correct Answer: B

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Question 25 View Details

A coil of wire consists of 50 turns, each with an area of 0.005 m^2. If the coil is placed in a magnetic field of magnitude 0.2 T, what is the magnitude of the induced emf?

A. 0.5 V

B. 1.0 V

C. 1.5 V

D. 2.0 V

Correct Answer: VIEW ANSWER

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