1991 - JAMB Physics Past Questions and Answers - page 3
21
Which of the following is TRUE of light and sound waves?
A
they both transmit energy
B
they both need a mediumfor propagation
C
they are both transverse waves
D
their velocities in air are equal
22
The image in a pin-hole camera is
A
errect and formed by refraction through a lens
B
virtual and formed by dispersion
C
erect and gets sharper as the hole becomes larger
D
inverted and formed by the light from each point travelling in a straight line
23
When a plane mirror at which a ray is incident is rotated through an angle \( \theta \), the reflected ray will be rotated through
A
\(\frac{1}{2}\)\(\theta\)
B
\(\theta\)
C
2\(\theta\)
D
3\(\theta\)
24
A trough 12.0cm deep is filled with water of refractive index \(\frac{4}{3}\). By how much would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface?
A
3.0cm
B
6.0cm
C
9.0cm
D
16.0cm
25
In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will
A
pass through undeviated
B
pass through the center of curvature after refraction
C
emerge parallel to the principal axis
D
pass through the principal focus after refraction
26
Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?
A
The image is virtual, 3cm in front of the lens
B
The image is real, 6cm behind the lens
C
The image is virtual, 6cm in front of the lens
D
The image is real, 3cm in front the lens
27
Two tuning forks of frequency 256Hz and 260Hz are sounded close to each other. What is the frequency of the beats produced?
A
2Hz
B
4Hz
C
8Hz
D
258Hz
28
A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
A
330.0m
B
335.4m
C
660.0m
D
670.8m
29
When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as
A
beats
B
echoing
C
resonance
D
reverberation
30
Which of the following statements is CORRECT about the earth's magnetic field?
A
the angle of dip is the angle which a freely suspended magnet makes with the vertical
B
the angle of declination is the angle between the magnetic meridian and the geographic meridian
C
the angle of declination is the angle which a magnetic compass makes with the magnetic meridian
D
the angle of inclination is the difference between the angle of dip and the angle of declination
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