2005 - JAMB Physics Past Questions and Answers - page 5
41
Two liquids L1 and L2 are contained in a U - tube. The height and the density of L1 are 8 cm and 103 kgm-3 respectively. If the density of L2 is 800 kgm-3, its height measured from the same level is
A
8 cm
B
10 cm
C
16 cm
D
12 cm
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42
106J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is
A
2.0 x 106J kg-1
B
5.0 x 106J kg-1
C
2.0 x 105J kg-1
D
5.0 x 105J kg-1
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43

A
4V
B
12V
C
2V
D
6V
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44
If the distance between two point charges its increased by a factor of four, the magnitude of the electrostatic force between them will be
A
1/4 of its former value
B
1/16 of its former value
C
1/2 of its former value
D
4 times its former value
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45
The velocity of sound in air will be doubled if it's absolute temperature is
A
Quadrupled
B
Constant
C
Halved
D
Doulbed
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46
A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is
A
400N
B
200N
C
100N
D
800N
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47
If two inductors of inductances 3H and 6H are arranged in series, the total inductance is
A
9.0H
B
18.0H
C
0.5H
D
2.0H
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48
Am elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is
A
12cm
B
20cm
C
18cm
D
15cm
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