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POST UTME CRAWFORD UNIVERSITY 2020 Physics | Objective

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Question 1 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 force of 12 N, determine the angle between the force and the radius vector.

A. 45°

Correct B. 60°

C. 75°

D. 90°

Correct Answer: B

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Question 2 View Details

A 5 μF capacitor is connected in series with a 10 kΩ resistor and a 20 V battery. If the switch is closed at t = 0, determine the charge on the capacitor after 5 ms.

A. 0.1 μC

B. 0.2 μC

Correct C. 0.3 μC

D. 0.4 μC

Correct Answer: C

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Question 3 View Details

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

A. 20°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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Question 4 View Details

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

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 5 View Details

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a voltage of 12 V is applied across the circuit, determine the current in the circuit.

A. 0.2 A

Correct B. 0.3 A

C. 0.4 A

D. 0.5 A

Correct Answer: B

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Question 6 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 tension in the string?

A. 12 N

Correct B. 16 N

C. 20 N

D. 24 N

Correct Answer: B

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Question 7 View Details

A 10 μF capacitor is connected in series with a 20 Ω resistor and a 50 V battery. What is the current in the circuit?

A. 1.25 A

Correct B. 2.5 A

C. 5 A

D. 10 A

Correct Answer: B

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Question 8 View Details

A gas is heated from 300 K to 400 K at cons\tant volume. What is the change in internal energy?

A. 3000 J

Correct B. 4056 J

C. 6000 J

D. 9000 J

Correct Answer: B

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Question 9 View Details

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. 20 m

Correct B. 32.9 m

C. 50 m

D. 80 m

Correct Answer: B

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Question 10 View Details

A quantum particle is confined to a one-dimensional box of length 1 m. What is the energy of the particle in the ground state?

A. 1.0 eV

Correct B. 6.025 eV

C. 10.0 eV

D. 20.0 eV

Correct Answer: B

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Question 11 View Details

A 1000 Hz AC voltage source is connected to a 50 Ω resistor. If the maximum voltage is 100 V, what is the rms voltage?

A. 50 V

Correct B. 70.7 V

C. 100 V

D. 141.4 V

Correct Answer: B

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Question 12 View Details

A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume?

A. 0.5 L

Correct B. 1 L

C. 2 L

D. 4 L

Correct Answer: B

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Question 13 View Details

A 2 kg object is moving at 5 m/s. What is its kinetic energy?

A. 12.5 J

Correct B. 25 J

C. 50 J

D. 100 J

Correct Answer: B

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Question 14 View Details

A 100 V DC source is connected to a 10 Ω resistor. What is the current?

A. 5 A

Correct B. 10 A

C. 20 A

D. 50 A

Correct Answer: B

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Question 15 View Details

A 50 Ω resistor is connected to a 100 V AC source. What is the impedance?

A. 50 Ω

Correct B. 70.7 Ω

C. 100 Ω

D. 141.4 Ω

Correct Answer: B

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Question 16 View Details

A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 10 m/s

B. 15 m/s

Correct C. 20 m/s

D. 25 m/s

Correct Answer: C

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Question 17 View Details

A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10^-6 F, calculate the charge on the capacitor when a potential difference of 10 V is applied across it.

Correct A. 10^-5 C

B. 10^-6 C

C. 10^-7 C

D. 10^-8 C

Correct Answer: A

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Question 18 View Details

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°, calculate the angle of deviation.

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 19 View Details

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 20 View Details

A wave has a frequency of 50 Hz and a wavelength of 0.1 m. Calculate the speed of the wave.

A. 5 m/s

B. 10 m/s

Correct C. 20 m/s

D. 50 m/s

Correct Answer: C

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Question 21 View Details

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-10 F, what is the charge stored when the potential difference between the plates is 10 V?

A. 4.0 x 10^-9 C

Correct B. 8.0 x 10^-9 C

C. 1.6 x 10^-8 C

D. 3.2 x 10^-8 C

Correct Answer: B

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Question 22 View Details

A block of mass 2 kg is attached to a horizontal spring with spring cons\tant 100 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?

A. 0.2 m/s

B. 0.4 m/s

Correct C. 0.6 m/s

D. 0.8 m/s

Correct Answer: C

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Question 23 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 of the sample after 20 minutes?

A. 50 Bq

B. 25 Bq

Correct C. 12.5 Bq

D. 6.25 Bq

Correct Answer: C

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Question 24 View Details

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

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 25 View Details

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

A. 1.7 m

Correct B. 1.8 m

C. 1.9 m

D. 2.0 m

Correct Answer: B

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