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NECO SSCE Physics 2009 past questions and answers

This 2009 NECO SSCE 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 2009 set with instant marking.

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Sample NECO SSCE Physics 2009 questions

1. A ray travels from air into glass of refractive index 1.5 at an incidence angle of 30 degrees. What is the approximate angle of refraction?
  1. 19.5 degrees
  2. 30 degrees
  3. 41.8 degrees
  4. 48.6 degrees

Answer: A. 19.5 degrees

Snell's law gives sin r = sin 30 degrees divided by 1.5 = 1/3, so r is about 19.5 degrees.

2. The refractive index of a glass block relative to air is 1.5. What is its critical angle at a glass-air boundary, approximately?
  1. 30.0 degrees
  2. 41.8 degrees
  3. 48.6 degrees
  4. 60.0 degrees

Answer: B. 41.8 degrees

At the critical angle sin c = 1/1.5, giving c approximately 41.8 degrees.

3. An object is placed 30 cm in front of a concave mirror whose focal length is 15 cm. Where is the image formed and what is its nature?
  1. 15 cm in front, virtual and upright
  2. 30 cm behind, virtual and upright
  3. 30 cm in front, real and inverted
  4. 60 cm in front, real and enlarged

Answer: C. 30 cm in front, real and inverted

The object is at twice the focal length, so the image is real, inverted, and formed at the same distance in front of the mirror.

4. An object is 30 cm from a converging lens of focal length 20 cm. How far from the lens is the real image?
  1. 12 cm
  2. 24 cm
  3. 40 cm
  4. 60 cm

Answer: D. 60 cm

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

5. A light ray strikes a plane mirror at 35 degrees to the mirror surface. What is the angle between the incident and reflected rays?
  1. 110 degrees
  2. 70 degrees
  3. 55 degrees
  4. 35 degrees

Answer: A. 110 degrees

The incidence angle to the normal is 55 degrees, so the angle between the rays is 2 x 55 = 110 degrees.

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