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JAMB UTME Physics 2011 past questions and answers

This 2011 JAMB UTME Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2011 set with instant marking.

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Sample JAMB UTME Physics 2011 questions

1. Light travels at 3.0 x 10^8 m/s in air and 2.0 x 10^8 m/s in a glass block. What is the refractive index of the glass?
  1. 1.5
  2. 0.67
  3. 0.50
  4. 3.0

Answer: A. 1.5

The refractive index is the speed in air divided by the speed in glass, giving 3.0/2.0 = 1.5.

2. An object is placed 30 cm from a converging lens of focal length 20 cm. How far from the lens is the image formed?
  1. 12 cm
  2. 60 cm
  3. 24 cm
  4. 50 cm

Answer: B. 60 cm

Using 1/f = 1/u + 1/v gives 1/v = 1/20 - 1/30 = 1/60, so the image distance is 60 cm.

3. A glass has refractive index 1.5 relative to air. What is its critical angle approximately?
  1. 30 degrees
  2. 60 degrees
  3. 42 degrees
  4. 49 degrees

Answer: C. 42 degrees

At the critical angle sin(c) = 1/1.5 = 0.667, which gives c approximately 42 degrees.

4. Two charges of +2 x 10^-6 C and -3 x 10^-6 C are 0.30 m apart in air. What is the magnitude and nature of the force between them? Take k = 9.0 x 10^9 N m^2/C^2.
  1. 0.06 N, repulsive
  2. 6.0 N, attractive
  3. 0.60 N, repulsive
  4. 0.60 N, attractive

Answer: D. 0.60 N, attractive

Coulomb's law gives F = 9.0 x 10^9 x 6 x 10^-12/0.30^2 = 0.60 N, and opposite charges attract.

5. What is the electric field strength 0.30 m from an isolated charge of 4.0 x 10^-6 C in air? Take k = 9.0 x 10^9 N m^2/C^2.
  1. 4.0 x 10^5 N/C
  2. 1.2 x 10^5 N/C
  3. 4.0 x 10^4 N/C
  4. 3.6 x 10^6 N/C

Answer: A. 4.0 x 10^5 N/C

The field is kQ/r^2 = (9.0 x 10^9 x 4.0 x 10^-6)/0.30^2 = 4.0 x 10^5 N/C.

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