# PHYSICS : REVISION TEST ON TOPICS OF CLASS XI ---III

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It is impossible
It is possible with high probability
It is possible with low probability
Data are insufficient
An ideal Carnot engine, whose efficiency is 405, receives heat at 400 K. If its efficiency is 50% , then the intake temperature for the same exhaust temperature
600 K
700 K
800 K
900 K
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Two sound waves with wavelengths 5.0 m and 5.5 m respectively each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second.
0
1
6
12
A source and an observer move away from each other, with a velocity of 10 m/s with reseed to ground. If the observer finds the frequency of sound coming from the source as 1950 Hz., then original frequency of source is
1950 Hz
2068 Hz
2132 Hz
2486 Hz
A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will
First increase and the decrease
First decrease and then increase
Go in increasing
Go on decreasing
A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight the joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n1. Then (if the sound velocity in air is 300 m/s)
n1 = 10n
n1 = 0
n1 = 0.1n
n1 = -0.1n
Two waves of the same frequency and intensity superimpose each other in opposite phases. After the superposition, the intensity and frequency of waves will
Increase
Decrease
Remain constant
Become zero
A simple pendulum has a metal bob, which is negatively charged. If it is allowed to oscillate above a positively charged metallic plate, the, its time period will
Increase
Decrease
Become zero
Remain the same
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Description:

TOPICS: CARNOT'S ENGINE, DOPPLER'S EFFECT, OSCILLATIONS

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Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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