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1994 - WAEC Physics Past Questions and Answers - page 4

31

A note of frequency of 2000Hz has a velocity of (400ms^{-1}). What is the wavelength of the note?

A
800m
B
200m
C
5m
D
2m
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32

A cell of e.m.f. 1.5V and internal resistance of 2.5Ω is connected in series with an ammeter of resistance 0.5W and a resistor of resistance of 7.0Ω. Calculate the current in the circuit.

A
0.15A
B
0.20A
C
2.10A
D
3A
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33

A ball is dropped from a height of 45m above the ground. Calculate the velocity of the ball just before it strikes the ground. (Neglect air resistance and take g as (10ms^{-2})

A
21.2\(ms^{-1}\)
B
30\(ms^{-1}\)
C
300\(ms^{-1}\)
D
450\(ms^{-1}\)
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34

A body accelerates uniformly from rest at (2ms^{-2}). Calculate the velocity after traveling 9m

A
36\(ms^{-1}\)
B
18\(ms^{-1}\)
C
6\(ms^{-1}\)
D
4.5\(ms^{-1}\)
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35

A metal rod of length 40cm at 20°C is heated to a temperature of 45°C. If the new length of the rod is 40.05cm. Calculate its linear expansitivity

A
1.2 x \(10^{-5}K{-1}\)
B
2.5x \(10^{-5}K{-1}\)
C
3.5x \(10^{-5}K{-1}\)
D
4.5x \(10^{-5}K{-1}\)
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36

500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J(kg^{-1}K^{-1})

A
9000J
B
12600J
C
21000J
D
25200J
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37

An electric kettle rated 1500W boils away 0.3kg of a liquid at its boiling point every 300s. Calculate the specific latent heat of the vaporisation of the liquid

A
1.5 x \(10^6Jkg^-1\)
B
1.35 x \(10^6Jkg^-1\)
C
1.5 x \(10^5Jkg^-1\)
D
4.5 x \(10^2Jkg^-1\)
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38

(500cm^{-3}) of a gas is collected at 0°C and at a pressure of 72cm of mercury. What is the volume of the the gas at the same temperature and at a pressure of 76cm of the same mercury?

A
\(\frac{76\times500}{72}cm^3\)
B
\(\frac{72\times500}{76}cm^3\)
C
\(\frac{72\times76}{500}cm^3\)
D
\(\frac{76}{72\times500}cm^3\)
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39

The pressure of air in a tire is (22.5Nm^{-2}) at 27°C. If the air in the tyre heats up to 47°C, calculate the new pressure of the air, assuming that no air leaks out and that the change in volume of the air can be neglected.

A
\(21.10Nm^{-2}\)
B
\(24Nm^{-2}\)
C
\(39.07Nm^{-2}\)
D
\(45Nm^{-2}\)
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40

Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200(kg^{-1}K{-1})

A
2.5 minutes
B
5.7 minutes
C
6.7 minutes
D
7.5 minutes
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