2022 - JAMB Physics Past Questions and Answers - page 4
31
The amount of energy required to change a kilogram of ice block into the water without a change in temperature is?
A
specific latent heat of fusion of ice
B
specific heat capacity of ice
C
heat capacity of ice
D
specific heat of vaporization of ice
32
Which expression gives the magnetic flux?
A
qVB sin\(\theta\)
B
\(\frac{\mu \phi I}{2 \pi r}\)
C
BA cos \(\theta\)
D
-N \(\frac{d \phi}{dt}\)
33
The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles's law is a___?
A
hyperbola
B
parabola
C
curve
D
straight line
34
What is the quantity of heat required to convert 20 g of ice at 0 ºC to water at the same temperature? (Specific latent heat of ice = 336 Jg\(^{-1}\))
A
7.06 x 10\(^{3}\)J
B
5.38 x 10\(^{3}\)J
C
6.72 x 10\(^{3}\)J
D
1.35 x 10\(^{3}\)J
35
A train of mass 1600kg attains a speed of 25ms\(^{-1}\) in 20 seconds. The power developed in the engine is?
A
2.5 KW
B
80 KW
C
25 KW
D
50 KW
36
The main factor which affects the speed of sound wave is the?
A
properties of the medium
B
amplitude of the sound wave
C
intensity of the sound wave
D
loudness of the sound wave
37
A semiconductor is formed by?
A
co-ordinate bonds
B
electrovalent bonds
C
a substance free of bonds
D
covalent bonds
38
Which of the following is a scalar quantity?
A
weight
B
momentum
C
potential energy
D
displacement
39
The mercury column in the barometer at natural atmospheric pressure has a height of?
A
0.76 cm at see level
B
760 cm at sea level
C
7.6 cm at sea level
D
76 cm at sea level
40
If an object just begins to slide on a surface inclined at 30º to the horizontal,the coefficient of friction is?
A
√3
B
\(\frac{√3}{2}\)
C
\(\frac{1}{√2}\)
D
\(\frac{1}{√3}\)
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