1993 - JAMB Physics Past Questions and Answers - page 2
11
A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is
A
2.0 x 102K-1
B
2.0 x 102K-1
C
5.0 x 10-3K-1
D
2.0 x 10-5K-1
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12
When the volume of a given mass of gas is halved and its temperature doubled, the pressure
A
remains constant
B
increases by a factor of 4
C
increases by a factor of 3
D
decreases by a factor of 4
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13
200g of water at 90oC is mixed with 100g of water at 30oC. What is the final temperature?
A
50oC
B
60oC
C
70oC
D
80oC
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14
The relationship between L and the wavelength I of the stationary wave is
A
2L = \(\lambda\)
B
L = \(\lambda\)
C
L = \(\frac {\lambda}{3}\)
D
4L = 3 \(\lambda\)
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15
Determine the distance between the consecutive antinodes XX if the wavelength is 66cm
A
15cm
B
30cm
C
60cm
D
120cm
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16
Which of the following waves can propagate through a vacuum?
A
High velocity sound waves
B
Ultrasonic waves
C
Acoustic waves
D
Infra-red waves
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17
Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10-3S. How far is the aircraft from the antenna? [c = 3 x 108ms-1 ]
A
6.0 x 102ms-1
B
1.2 x 103km
C
3.0 x 103km
D
6.0 x 10 5km
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18
Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?
A
\(\frac{V}{r}\) - 1
B
\(\frac{2V}{r}\) - 1
C
\(\frac{U}{r}\) - 1
D
\(\frac{2U}{r}\) - 1
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19
If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is
A
17cm
B
20cm
C
25cm
D
100cm
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20
Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.
A
ii only
B
ii and iii only
C
i and iii only
D
i, ii, and iii only
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