Physics 2018 | Study Mode

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Question 11
A
I and II only
B
II and IV only
C
I,II and III
D
I, II and IV
Explanation

The rate of cooling of liduid according to Newton's law of cooling depends on:

- Temperature of the liquid

- Temperature of the enclosure

- The area of the exposed surface

- The nature and extent of the surface of the containing vessel


Correct option: C
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Question 12
A
I
B
II
C
III
D
IV
Explanation

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


Correct option: D
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Question 13
A
0.0\(ms^{-1}\)
B
5.6\(ms^{-1}\)
C
10.6\(ms^{-1}\)
D
15.0\(ms^{-1}\)
Explanation

The horizontal component of velocity, \(V_{x}\), is unaffected by the acceleration of free fall and remains constant.

\(V_{x} = U_{x} = Ucos\theta\)

= \(15 \times cos45 = 15\times 0.7071\)

\(\approxeq 10.6ms^{-1}\)


Correct option: C
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Question 14
A
0K
B
32K
C
100K
D
273K
Explanation

The absolute zero of the scale of temperature being the ice point of the absolute scale of temperature is 0K, which is -273C.


Correct option: A
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Question 15
A
Increase in the pressure of the atmosphere
B
Rise in temperature
C
Increase in the surface area of the lake
D
Increase in the speed of the wind
Explanation

The rate of evaporation is increased by the lowering of atmospheric pressure and not its increase. Every other factor stands, for the increase of evaporation process.


Correct option: A
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Question 16
A
0.125Hz
B
1.25Hz
C
7.50Hz
D
8.00Hz
Explanation

10 complete oscillations = 8.0s

1 complete oscillation (period) = \(\frac{8}{10}\)s

Frequency = \(\frac{1}{period}\) = \(\frac{1}{0.8} = 1.25Hz\)


Correct option: B
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Question 17
A
I and III only
B
I and II only
C
II and III only
D
I, II and III
Explanation

In SHM, the body must have acceleration in a direction opposite to the displacement and the acceleration must be directly proportional to displacement. Also, the acceleration must be directed towards its mean position. This is not the case with a football on the pitch.


Correct option: A
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Question 18
A
3.3C
B
7.0C
C
13C
D
30.0C
Explanation

Let the room temperature be X.

We have, \(\frac{3-0}{10-0} = \frac{X-0}{100-0}\)

\(\frac{3}{10} = \frac{X}{100}\)

\(X = \frac{3 \times 100}{10}\)

= 30C


Correct option: D
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Question 19
A
meter per second
B
seconds
C
hertz
D
farad
Explanation

The unit of frequency is hertz, abbreviated Hz.


Correct option: C
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Question 20
A
Radio waves
B
X-ray
C
Gamma rays
D
Ultra-violet rays
Explanation

The gamma rays have the shortest wavelength and therefore, impart the highest photon energy.


Correct option: C

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