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2024 - JAMB Physics Past Questions and Answers - page 3

21

What is the inductance reactance of a coil of 7H when connected to a 50Hz a.c circuit?

A
2200\(\Omega\)
B
2000\(\Omega\)
C
1200\(\Omega\)
D
1100\(\Omega\)
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22

When a charged ebonite rod is brought near a charged glass rod, there will be 

A
attraction
B
repulsion
C
spark
D
no force experienced
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23

The thermometer whose thermometric property is change in volume with temperature is 

A
Resistance thermometer
B
Thermocouple
C
Bimetallic thermometer
D
Liquid-in-glass thermometer
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24

A particular household utilizes three electrical appliances for six hours daily if the appliances are rated 80W, 100W, and 120W respectively. Calculate the electrical bills paid monthly if an average month is 31 days. [1kwh = #24.08k]

A
₦ 2843.22k
B
₦ 1950.22k
C
₦ 1343.66k
D
₦ 46.23k
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25

The moon's acceleration due to gravity is \(\frac{1}{6}\) of the earth's value. The weight of a bowling ball on the moon would be

A
6 times its weight on the earth
B
\(\frac{1}{6}\) of its weight on the earth
C
36 times its weight on the earth
D
equal to its weight on the earth
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26

What will be the weight of a man of mass 60kg standing in a lift if the lift is descending vertically at 3ms\(^2\)?

A
780N
B
546N
C
660N
D
420N
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27

288KJ is conducted across two opposite faces of a 3m cube of temperature gradient 90ºCm\(^{-1}\) in 7200s. Calculate the thermal conductivity.

A
4.9 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
B
A. 5.0 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
C
5.2 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
D
5.1 x 10\(^{-2}\)Wm\(^{-1}\)k\(^{-1}\)
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28

When a cell of e.m.f 3.06V is connected, the balance of a potentiometer is 75cm, Calculate the new balance of a cell of e.m.f  2.295V

A
56.26cm
B
73.20cm
C
77.80cm
D
78.70cm
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29

The mechanical advantage of the machine shown above 

A
7.5
B
15.5
C
30.0
D
60.0
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30

Newton's law of cooling is valid only for a 

A
small temperature range
B
large temperature range
C
free flow range
D
presence of heat source
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