Physics Practice Question and Answer
8 Q: What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?
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63c8f745bdbddb32fda0e8d0- 1Low temperature and low pressurefalse
- 2Low temperature and high pressurefalse
- 3High temperature and low pressuretrue
- 4High temperature and high pressurefalse
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Answer : 3. "High temperature and low pressure "
Explanation :
A real gas can behave as an ideal gas if volume of molecule is negligible and interaction between molecule is negligible. This will happen if number of molecule per unit volume is very small. This is only possible at high temperature and low pressure.
Q: In case of negative work the angle between the force and displacement is-
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60892b3c0ac1df7d9f80ef4b- 10°false
- 245°false
- 390°false
- 4180°true
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Answer : 4. "180°"
Q: The velocity of light in vacuum or air is
1145 061655d803ee3b5612c8e183f
61655d803ee3b5612c8e183f- 1$$3 x 10^8$$ m / sec .true
- 2$$2 x 10^4$$ m / sec .false
- 3$$9 x 10^2$$ m / sec .false
- 4$$3 x 10^11$$ m / sec .false
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Answer : 1. "$$3 x 10^8$$ m / sec . "
Q: Which one of the following common devices works on the basis of the principle of mutual induction?
1143 1609399ea402c5862950ea190
609399ea402c5862950ea190- 1Tubelightfalse
- 2Transformertrue
- 3Photodiodefalse
- 4LEDfalse
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Answer : 2. "Transformer"
Q: Which of the following is renewable energy?
1141 160b4b2a67cb636175d3d0592
60b4b2a67cb636175d3d0592- 1Coalfalse
- 2Solar energytrue
- 3Natural Gasfalse
- 4Petrolfalse
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Answer : 2. "Solar energy"
Q: Is a mirror always a direct reflection of the real object?
1134 05f6da310ff25c92a085ba817
5f6da310ff25c92a085ba817- 1flat, convex, concavefalse
- 2flat, concavefalse
- 3convex-concavefalse
- 4Plain, convextrue
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Answer : 4. "Plain, convex"
Q: Which is the largest source of energy on earth?
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60b4b317f2c446136b8b6a5c- 1Suntrue
- 2woodfalse
- 3Moonfalse
- 4Coalfalse
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Answer : 1. "Sun"
Q: The observer hears a sound from the source which is moving away from the observer who is stationary. Determine the frequency of the sound
1132 063c8f650be373f6c954abbda
63c8f650be373f6c954abbda- 1It is halvedtrue
- 2It remains the samefalse
- 3It reaches infinityfalse
- 4It gets doubledfalse
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Answer : 1. "It is halved"
Explanation :
If the observer is moving away from the source ((Figure)), the observed frequency can be found: λs=vTo−voTovTs=(v−vo)Tov(1fs)=(v−vo)(1fo)fo=fs(v−vov).