Physics 2014 | Study Mode

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Question 21
A
Latent heat of vaporization of the liquid
B
Increased vibration of the molecules of the liquid about theit mean position
C
Variation of density of the liquid
D
Expansion of the liquid as it is heated
Explanation

Liquids and gases expand when they are heated.The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas.


Correct option: D
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Question 22
A
2.0x102Hz
B
4.5x103Hz
C
2.0x103Hz
D
4.5x102Hz
Explanation
Wavelength = 15cm = 0.15m

Velocity = 300m/s

V = fx

F = V/Wavelength

F = 300/0.15 Hertz

F = 2 x 103Hz

Correct option: C
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Question 23
A
528m
B
66m
C
136m
D
264m
Explanation
Time for echo both ways = 0.8
Therefore time for echo in 1 way = 0.8/2 = 0.4

Distance = Speed x time

Distance = 340 x 0.4

Distance = 136m

Correct option: C
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Question 24
A
2.5x102
B
2.5x10-2
C
2.5x10-1
D
2.5x101
Explanation
\(\text{Linear Magnification} = \frac{\text{Length of Camera}}{\text{Distance of the Object}}\)

\(\text{Linear Magnification} = \frac{25}{1000}\)

\(\text{Linear Magnification} = 2.5 \times 10^{-2}\)

Correct option: B
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Question 25
A
2.7m
B
2.0m
C
2.3m
D
2.5m
Explanation
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{f}\)

\(\frac{1}{8} + \frac{1}{V} = \frac{1}{2}\)

\(V = \frac{8}{3}\)

\(V = 2.7cm\)

Correct option: A
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Question 26
A
At infinity
B
Long
C
Short
D
The same
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: C
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Question 27
A
Infinity
B
The focus
C
The radius of curvature
D
The near point
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A
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Question 28
A
Remains the same
B
Collapses
C
Collapses and diverges again
D
Diverges
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 29
A
1C
B
5C
C
4C
D
2C
Explanation

Q = CV = 0.1 x 10 = 1C


Correct option: A
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Question 30
A
Twice the internal resistance of the cell
B
The same as the internal resistance of the cell
C
Greater than the internal resistance of the cell
D
Less than the internal resistance of the cell
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B

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