2015 - JAMB Physics Past Questions and Answers - page 5
41
The strength of an electromagnet increase with
A
Increase in the number of turn of the coil
B
Decrease in current with the coil
C
Increase in the distance between the pole
D
Increase in current without the coil
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42
A platinum resistance thermometer wire has a resistance of 70hms at 0°Cand 7.5 Ohms at 100°C. Calculate the temperature of the wire when the resistance is 7.2 Ohms
A
15°C
B
40°C
C
20°C
D
10°C
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43
Which of the following will increases the boiling point of water?
I. Taking it to a high altitude
II. Dissolving a salt into it
III. Heating it in a sealed flask
IV. Increasing the rate of heat supply
.
I. Taking it to a high altitude
II. Dissolving a salt into it
III. Heating it in a sealed flask
IV. Increasing the rate of heat supply
.
A
I only
B
III & IV only
C
II & III only
D
II only
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44
What is the magnitude of the couple which acts on a rotating circular disc of radius 2m, if a constant tangential force of 2N is responsible for the rotation.
A
15Nm
B
25Nm
C
3Nm
D
4Nm
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45
Transformers are designed so that energy losses are reduced to a minimum. This is achieved through those process.
I. Using a soft iron ore
II. Laminating the iron core to reduce energy loses due to eddy current
III. Designing an efficient iron core
I. Using a soft iron ore
II. Laminating the iron core to reduce energy loses due to eddy current
III. Designing an efficient iron core
A
I & II only
B
II only
C
I, II, & III only
D
III only
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46
The two liquids which are often used in thermometer on experiment basic is known as
A
Mercury only
B
Alcohol and Water
C
Mercury and Alcohol
D
Alcohol only
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47
Neutron were discovered by
A
J.J. Thompson
B
James Chadwick
C
Michael faraday
D
Dalton
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48
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
A
27m/s2
B
2m/s2
C
4m/s2
D
7m/s2
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49
What is the S.I unit of relative density?
A
kg m-2
B
kg m2
C
kg cm3
D
has no S.I unit
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50
For a best result using temperature to achieve an accurate measurement, it is best to use
A
Mercury thermometer
B
gas thermometer
C
clinical thermometer
D
alcohol thermometer
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