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POST UTME CRAWFORD UNIVERSITY 2017 Physics | Objective

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Question 1 View Details

A point charge of 2 μC is placed at the center of a hollow, conducting sphere of radius 0.1 m. What is the electric flux through the sphere?

A. 0 Nm^2/C

B. 2π × 10^-9 Nm^2/C

Correct C. 4π × 10^-9 Nm^2/C

D. 6π × 10^-9 Nm^2/C

Correct Answer: C

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Question 2 View Details

A particle of mass 0.5 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. What is the time of flight?

A. 1.5 s

Correct B. 2.5 s

C. 3.5 s

D. 4.5 s

Correct Answer: B

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Question 3 View Details

A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 30 years?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

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Question 4 View Details

A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the magnification of the image?

A. -0.5

Correct B. -1

C. -1.5

D. -2

Correct Answer: B

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Question 5 View Details

A liquid of density 1000 kg/m^3 is flowing through a horizontal pipe of radius 0.05 m. If the pressure difference between the two \ends of the pipe is 1000 Pa, what is the velocity of the liquid?

A. 0.5 m/s

Correct B. 1 m/s

C. 2 m/s

D. 5 m/s

Correct Answer: B

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Question 6 View Details

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the dielectric cons\tant of the material between the plates?

Correct A. 1.25

B. 1.5

C. 2.0

D. 2.5

Correct Answer: A

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Question 7 View Details

A body of mass 5 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the centripetal acceleration of the body?

A. 0.5 m/s^2

B. 1.0 m/s^2

Correct C. 2.0 m/s^2

D. 4.0 m/s^2

Correct Answer: C

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Question 8 View Details

A light ray 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?

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 9 View Details

A 100 W bulb is connected to a 220 V mains supply. What is the resis\tance of the bulb?

A. 10 Ω

Correct B. 20 Ω

C. 30 Ω

D. 40 Ω

Correct Answer: B

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Question 10 View Details

A gas occupies a volume of 2.5 m^3 at a pressure of 1.5 atm. What is the temperature of the gas in Kelvin?

A. 300 K

B. 400 K

Correct C. 500 K

D. 600 K

Correct Answer: C

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Question 11 View Details

A 1000 Hz AC voltage source is connected to a 50 Ω resistor in series with a 10 μF capacitor. The circuit is driven by a \sinusoidal voltage source with a peak value of 10 V. What is the magnitude of the current in the circuit at 50 Hz?

A. 0.2 A

Correct B. 0.5 A

C. 1.0 A

D. 2.0 A

Correct Answer: B

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Question 12 View Details

A 5 kg block is moving with a velocity of 2 m/s on a frictionless surface. A force of 10 N is applied to the block in the direction of motion. What is the acceleration of the block?

A. 0.5 m/s^2

B. 1.0 m/s^2

Correct C. 2.0 m/s^2

D. 5.0 m/s^2

Correct Answer: C

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Question 13 View Details

A 1000 W heater is connected to a 230 V AC supply. What is the current drawn by the heater?

A. 0.5 A

B. 1.0 A

C. 2.0 A

Correct D. 4.0 A

Correct Answer: D

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Question 14 View Details

A 2 kg block is moving with a velocity of 3 m/s on a frictionless surface. A force of 15 N is applied to the block in the direction of motion. What is the acceleration of the block?

A. 1.5 m/s^2

B. 2.0 m/s^2

C. 3.0 m/s^2

Correct D. 4.5 m/s^2

Correct Answer: D

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Question 15 View Details

A 500 Hz AC voltage source is connected to a 20 Ω resistor in series with a 5 μF capacitor. The circuit is driven by a \sinusoidal voltage source with a peak value of 5 V. What is the magnitude of the current in the circuit at 50 Hz?

A. 0.1 A

Correct B. 0.2 A

C. 0.5 A

D. 1.0 A

Correct Answer: B

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Question 16 View Details

A radioactive sample of Δₗ emits Δₗα particles with a half-life of 5.3 days. If the initial activity is 1.0 Ci, what is the activity after 10 days?

Correct A. 0.25 Ci

B. 0.5 Ci

C. 0.75 Ci

D. 1.0 Ci

Correct Answer: A

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Question 17 View Details

A 2.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.10 m from its equilibrium position and released from rest. What is the speed of the block when it passes through its equilibrium position?

A. 1.0 m/s

Correct B. 2.0 m/s

C. 3.0 m/s

D. 4.0 m/s

Correct Answer: B

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Question 18 View Details

A light wave with a frequency of 5.0 x 10¹ Hz and a wavelength of 600 nm is incident on a double-slit apparatus. What is the dis\tance between the central maximum and the first minimum?

A. 0.20 mm

Correct B. 0.30 mm

C. 0.40 mm

D. 0.50 mm

Correct Answer: B

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Question 19 View Details

A gas at 300 K and 1.0 atm is compressed to 2.0 atm. What is the final temperature?

A. 400 K

B. 500 K

Correct C. 600 K

D. 700 K

Correct Answer: C

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Question 20 View Details

A particle of mass 1.0 kg is confined to a one-dimensional box of length 0.10 m. What is the energy of the ground state?

Correct A. 1.0 x 10¹ J

B. 2.0 x 10¹ J

C. 3.0 x 10¹ J

D. 4.0 x 10¹ J

Correct Answer: A

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Question 21 View Details

A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.

A. 10 nF

Correct B. 20 nF

C. 30 nF

D. 40 nF

Correct Answer: B

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Question 22 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°, calculate the angle of re\fraction.

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 23 View Details

A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Calculate 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 24 View Details

A circuit consists of a 2 Ω resistor and a 4 Ω resistor connected in parallel. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the 2 Ω resistor.

A. 4 A

Correct B. 6 A

C. 8 A

D. 10 A

Correct Answer: B

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Question 25 View Details

A wave has a frequency of 100 Hz and a wavelength of 0.1 m. Calculate the speed of the wave.

A. 10 m/s

B. 20 m/s

Correct C. 30 m/s

D. 40 m/s

Correct Answer: C

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