Physics 1985 JAMB Past Questions

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When a sound wave passes from air into water its

A. speed and frequency increases but its wavelength remains the same
B. speed and wavelength increases but its frequency remains the same
C. speed decreases
D. speed remains the same but its frequency and wavelength change
E. speed increases but its frequency and wavelength decreases

View Answer & Discuss (27) JAMB 1985

If the fundamental frequency of a closed pipe organ on a day when the speed of sound is 340ms^-1 is 170Hz, then the length of the pipe is

A. 50cm
B. 70cm
C. 100cm
D. 150cm
E. 200cm

View Answer & Discuss (1) JAMB 1985

An object is placed 15cm in front of a concave mirror of radius 40cm. The image formed

A. virtual and 60cm behind the mirror
B. real and 60cm behind the mirror
C. virtual and at infinity
D. real and at infinity
E. virtual and 40cm from the mirror

View Answer & Discuss (13) JAMB 1985

A 45^o triangular glass prism can be used as a reflector of light because

A. A refraction never takes place in such a prism
B. the angle of reflection equals the angle of incidence
C. the refractive index of glass is less than 1
D. it is transparent
E. the critival angle angle for glass is less than 45^o

View Answer & Discuss (6) JAMB 1985

A convex mirror is used as a driving mirror because i. its image is erect. ii. it has a large field of view. iii. it has a long focal length. Identify the CORRECT statement(s)

A. i andiii only
B. i and ii only
C. ii and iii only
D. i, ii, and iii only
E. i only

View Answer & Discuss (1) JAMB 1985

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Physics 1985 JAMB Past Questions

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