Physics Past Questions

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3011

Given that SQ = 10cm and SP = 6cm, the refractive index of a block of glass shown above is

A. 0.30
B. 0.60
C. 1.67
D. 2.33
E. 2.36

View Answer & Discuss (4) JAMB 1980

3012

In the diagram above, MN is perpendicular to ON and MP. What is the difference between the moment about N of the force of 20 Newtons applied along MP and its moment about O?

A. Zero
B. 0.2N.m
C. 0.4N.m
D. 0.8N.m
E. 0.6N.m

View Answer & Discuss (14) JAMB 1980

3013

In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is \( \beta \) which of following statements is true???

A. \( \alpha = \beta \)
B. the efractive index of glass is \( \frac{sin\theta}{sin\alpha} \)
C. The ray suffers total internal reflection if \( \beta \) is greater than the critical angle
D. the efractive index of glass is \( \frac{sin\alpha}{sin\beta} \)

View Answer & Discuss (10) JAMB 1980

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3014

A body of mass 6kg rests on an inclined plane. The normal reaction is R, and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms\(^{-2}\) then the angle of inclination \( \theta \) is