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The velocities of light in air and glass are 3.0 x 10⁸ms^-1 and 2.0 x 10⁸ms^-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is

A. 0.33
B. 0.50
C. 0.67
D. 0.75

View Answer & Discuss (14) JAMB 1999

An astronomical telescope is said to be in normal adjustment when the

A. eye is accommodated
B. focal length of objective lens is longer than that of eye piece
C. final image is at the near point of eye
D. final image is at infinity

View Answer & Discuss (8) JAMB 1999

Which of the following electromagnetic waves is least energetic?

A. Infra-red rays
B. X-rays
C. Ultra-violet rays
D. Gamma rays

View Answer & Discuss (28) JAMB 1999

Steel is more suitable for permanent magnet than iron because the former

A. is easily demagnetized by shaing vigorously
B. is an alloy of many metals
C. is easily magnetized by alternating current through one cycle
D. retains magnetism more than iron

View Answer & Discuss (9) JAMB 1999

Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

A. 6.0V, 16Ω
B. 6.0V, 1Ω
C. 1.5V, 4Ω
D. 1.5V, 1Ω

View Answer & Discuss (11) JAMB 1999

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