1995 - JAMB Physics Past Questions and Answers - page 3
21
Which of the following is the exclusive property of a transverse wave?
A
diffraction
B
refraction
C
compression
D
polarization
correct option: d
Users' Answers & Comments22
The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?
A
7500m
B
300m
C
75m
D
15m
correct option: b
\(\lambda\)1F1 = \(\lambda\)2F2
1500 x 200000 = 1000000 x \(\lambda\)2
\(\lambda\)2 = 300m
Users' Answers & Comments1500 x 200000 = 1000000 x \(\lambda\)2
\(\lambda\)2 = 300m
23
The difference between sound waves and light waves is that sound waves
A
are transverse while light waves are longitudinal
B
require a medium to travel while light waves does not
C
can be diffracted but light waves cannot
D
cannot be reflected but light waves can
correct option: b
Users' Answers & Comments24
The pitch of an acoustic device can be increased by
A
increasing the frequency
B
increasing the amplitude
C
decreasing the loudness
D
decreasing the intensity
correct option: a
Users' Answers & Comments25
Total eclipse of the sun occurs when the
A
earth is between the moon and the sun
B
sun is between the moon and the earth
C
moon is between the sun and the earth
D
ozone layer is threatened
correct option: c
Users' Answers & Comments26
What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?
A
21o
B
22o
C
23o
D
24o
correct option: d
SinC = \(\frac{1}{n}\)V2
SinC = \(\frac{1}{2.42}\)
SinC =24o
Users' Answers & CommentsSinC = \(\frac{1}{2.42}\)
SinC =24o
27
A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is
A
convex and u =2f
B
concave and u = 2f
C
convex and u = f
D
concave and u = f
correct option: a
Users' Answers & Comments28
Which of the following pairs of colours gives the widest separation in the spectrum of white light?
A
Red and Violet
B
Green and Yellow
C
Red and Indigo
D
Yellow and Violet
correct option: a
Users' Answers & Comments29
Two parallel plates at a distance of 8.0 x 10-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?
A
4.8 Vm-1
B
75.0Vm-1
C
4800.0Vm-1
D
75000.0Vm-1
correct option: d
E = \(\frac{voltage}{distance}\)
= \(\frac{600}{8 \times 10^2}\)
= 75000.0Vm-1
Users' Answers & Comments= \(\frac{600}{8 \times 10^2}\)
= 75000.0Vm-1
30
At different locations on the earth's surface, the earth's magnetic field is
A
the same in magnitude and direction
B
the same in magnitude but different in direction
C
different in both magnitude and direction
D
different in magnitude but different in direction
correct option: a
Users' Answers & Comments