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POST UTME COVENANT UNIVERSITY 2017 Physics | Objective

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Question 1

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?

A. 0.1 A

Correct B. 0.2 A

C. 0.3 A

D. 0.4 A

Correct Answer: B

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Question 2

A body at a temperature of 27°C is heated by a body at a temperature of 127°C. If the specific heat capacity of the body at 27°C is 840 J/kg°C and the mass of the body is 2.5 kg, what is the final temperature of the body?

A. 30°C

B. 60°C

C. 100°C

Correct D. 127°C

Correct Answer: D

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Question 3

A capacitor of capaci\tance 2 μF is connected in series with a resistor of resis\tance 10 kΩ. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the circuit?

A. 1.0 × 10^{-3} A

Correct B. 1.2 × 10^{-3} A

C. 1.5 × 10^{-3} A

D. 2.0 × 10^{-3} A

Correct Answer: B

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Question 4

A gas at a pressure of 2 atm and a volume of 2 L is heated from 27°C to 127°C. If the gas is ideal, what is the final pressure of the gas?

A. 2.0 atm

B. 2.5 atm

Correct C. 2.67 atm

D. 3.0 atm

Correct Answer: C

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Question 5

A circuit consists of a 10 Ω resistor connected in series with a 20 Ω resistor and a 30 Ω resistor. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?

A. 0.1 A

Correct B. 0.2 A

C. 0.3 A

D. 0.4 A

Correct Answer: B

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Question 6

A uniform magnetic field of magnitude 2.0 T is directed along the z-axis. A current of 5.0 A flows in a circular loop of radius 0.20 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?

A. 0.20 A m^2

Correct B. 0.40 A m^2

C. 0.60 A m^2

D. 0.80 A m^2

Correct Answer: B

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Question 7

A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a speed of 4.0 m/s. What is the magnitude of the centripetal force acting on the particle?

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 8

A block of mass 5.0 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. The block is displaced by 0.20 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 0.50 m/s

B. 1.00 m/s

Correct C. 1.50 m/s

D. 2.00 m/s

Correct Answer: C

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Question 9

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5.0 V. What is the energy stored in the capacitor?

A. 0.25 J

Correct B. 0.50 J

C. 0.75 J

D. 1.00 J

Correct Answer: B

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Question 10

A photon of wavelength 600 nm is incident on a metal surface. What is the energy of the photon?

A. 2.00 eV

B. 3.00 eV

Correct C. 4.00 eV

D. 5.00 eV

Correct Answer: C

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Question 11

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 uniform magnetic field of 2 T directed perp\endicular to the plane of the circular path, what is the magnitude of the magnetic force acting on the particle?

A. 8 N

B. 16 N

Correct C. 32 N

D. 64 N

Correct Answer: C

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Question 12

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?

A. 10 cm

Correct B. 15 cm

C. 20 cm

D. 25 cm

Correct Answer: B

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Question 13

A block of mass 5 kg is moving with a speed of 2 m/s on a frictionless surface. If a force of 10 N is applied to the block, what is the acceleration of the block?

A. 0.5 m/s^2

B. 1 m/s^2

Correct C. 2 m/s^2

D. 5 m/s^2

Correct Answer: C

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Question 14

A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If the dis\tance between the plates is doubled, what is the new potential difference?

A. 5 V

B. 10 V

Correct C. 20 V

D. 40 V

Correct Answer: C

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Question 15

A 100 Ω resistor is connected in series with a 200 Ω resistor and a 300 Ω resistor. What is the equivalent resis\tance?

A. 100 Ω

B. 200 Ω

C. 300 Ω

Correct D. 600 Ω

Correct Answer: D

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Question 16

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, what is the magnitude of the acceleration of the particle?

A. 10 m/s^2

Correct B. 12 m/s^2

C. 15 m/s^2

D. 20 m/s^2

Correct Answer: B

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Question 17

A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 18

A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 20 years?

A. 250 Bq

Correct B. 500 Bq

C. 750 Bq

D. 1000 Bq

Correct Answer: B

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Question 19

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. 1.5 A

Correct B. 2 A

C. 2.5 A

D. 3 A

Correct Answer: B

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Question 20

A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?

A. 100 m/s

Correct B. 200 m/s

C. 300 m/s

D. 400 m/s

Correct Answer: B

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Question 21

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

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 22

A 5 kg block 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, what is the magnitude of the force exerted by the spring?

A. 20 N

B. 40 N

Correct C. 60 N

D. 80 N

Correct Answer: C

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Question 23

A car travels from point A to point B with a cons\tant acceleration of 2 m/s². If the initial velocity is 5 m/s and the time taken is 10 s, what is the dis\tance traveled?

A. 50 m

B. 75 m

Correct C. 100 m

D. 125 m

Correct Answer: C

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Question 24

A light source is placed 2 m away from a convex lens with a focal length of 0.5 m. If the light source is moved 0.1 m closer to the lens, what is the new image dis\tance?

A. 1.5 m

Correct B. 1.8 m

C. 2.0 m

D. 2.2 m

Correct Answer: B

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Question 25

A 10 kg block is placed on a horizontal surface with a coefficient of friction of 0.5. If a horizontal force of 20 N is applied to the block, what is the acceleration of the block?

A. 0.5 m/s²

Correct B. 1.0 m/s²

C. 1.5 m/s²

D. 2.0 m/s²

Correct Answer: B

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