2002 - JAMB Physics Past Questions and Answers - page 2
11
I. Temperature.
II. Density of air molecules
III. Pressure
IV. Pitch
Which of the above will affect the velocity of sound in the air
II. Density of air molecules
III. Pressure
IV. Pitch
Which of the above will affect the velocity of sound in the air
A
I and II only
B
II and IV only
C
I,II and IV only
D
I,II,III nad IV
correct option: a
Users' Answers & Comments12
Which of the following is a characteristics of stationary waves?
A
They are formed by two identical waves travelling in opposite directions
B
they can be transverse or longitudinal
C
The distance between two successive nodes is one wavelenght
D
The antinode is a point of minimum displacement
correct option: a
Users' Answers & Comments13
To produce an enlarged and erect image with a concave mirror,the object must be positioned
A
at the principal focus
B
beyond the centre of curvature
C
between the principal focus and the centre of the curvature
D
between the principal focus and the pole
correct option: d
Users' Answers & Comments14
the property that is propagated in a traveling wave is
A
frequency
B
amplitude
C
energy
D
wave lenght
correct option: c
Users' Answers & Comments15
Which of the following eye defects can be corrected using a cylindrical lens.
A
myopia
B
Astigmatism
C
Presbyopia
D
Chromatic abiration
correct option: b
Users' Answers & Comments16
The time rate of loss of heat by a body is proportional to the
A
difference in temprature between the body and its surroundings
B
temperature of its surroundings
C
ratio of the temperature of the body to that of its surroundings
D
temperature of the body
correct option: a
Users' Answers & Comments17
If tension is maintained on a stretched string of length 0.6m, such that its fundamental frequency of 220Hz is excited, determine the velocity of the transverse wave in the string.
A
528 ms-1
B
264 ms-1
C
132 ms-1
D
66 ms-1
correct option: b
in a vibrating string the fundamental frequency is given by fo = v/2L
therefore velocity = 2L x f.
= 2 x 0.6 x 220
= 264 m/s.
Users' Answers & Commentstherefore velocity = 2L x f.
= 2 x 0.6 x 220
= 264 m/s.
18
A concave mirror of radius of curvature 40 cm forms a real image twice as large as the object.
the object distance is
the object distance is
A
10 cm
B
30 cm
C
40 cm
D
60 cm
correct option: b
if r = 40 cm , then f = r/2 = 40/2 = 20 cm
then for a real image by a concave mirror,
magnification M = f/u-f => 2 = 20/U-20
therefore 2(u-20) = 20
2u - 40 = 20
2u = 40 + 20
2u = 60/2 = 30 cm
Users' Answers & Commentsthen for a real image by a concave mirror,
magnification M = f/u-f => 2 = 20/U-20
therefore 2(u-20) = 20
2u - 40 = 20
2u = 40 + 20
2u = 60/2 = 30 cm
19
water is a poor thermometric liquid because it
A
is opaque
B
is a poor conductor
C
wets glass
D
has low vapour pressure
correct option: b
Users' Answers & Comments20
a ray of light which strikes a glass slab from air at normal incidence passes through the slab
A
undeviated and undisplaced at a lower speed
B
deviated and undisplaced at a lower speed
C
deviated and displaced at a lower speed
D
undeviated and displaced at a faster speed
correct option: a
Users' Answers & Comments