Physics Questions And Answers

99. Which one among the following radiations carries maximum energy?
A. gamma rays
B. x–rays
C. infra red rays
D. ultraviolet rays

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Answer: A. gamma rays


100. What is the rate of acceleration of gravity?
a. 10 m/s/s
b. 9.8 m/s/s
c. 6.8 m/s/s
d. 7.8 m/s/s

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ANSWER: b. 9.8 m/s/s


101. The wave number is the number?
a. of waves that cross in one second
b. associated with the orbit
c. of waves per unit length
d. of spectral lines produced

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ANSWER : of waves per unit length


102. Pure water freezes at what temperature?  
A.  47 F
B.  32 F
C.  0 F
D.  19 F

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Answer : B.  32 F



103. AC Voltage in our household circuit ____
A. 135V                                 
B. 220V                                 
C. 230V                                 
D. None of the above

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Ans. C


104. According to kinetic theory gases, at the temperature absolute zero, the gas molecules -
a. Start movement
b. Become massless
c. Start emitting light
d. Stop movement

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Ans: 4



105. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
A. work done in rolling is more than in lifting
B. work done in lifting the stone is equal to rolling it
C. work done in both is same but the rate of doing work is less in rolling
D.work done in rolling a stone is less than in lifting it

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Answer: D


106. Which vitamin is abundant in citrus fruits?  
A.  Vitamin A
B.  Vitamin B
C.  Vitamin C
D.  Vitamin D

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Answer: C.  Vitamin C



107. X–rays travel with the velocity of
A. positive rays
B. sound
C. light
D. alpha rays

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Answer:  C. light



108. The working principle of a washing machine is
A) reverse osmosis
B) diffusion
C) centrifugation
D) dialysis

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Answer: C) centrifugation


109. What is the main constituent of coal gas?  
A.  Oxygen
B.  Water
C.  Nitrogen
D.  Methane

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Answer : D.  Methane



110. Which device controls heating and cooling to maintain a desired temperature? 
a. cryostat
b. thermostat
c. thermister
d. thermite

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Answer : Thermostat



111. Large angle produces?
a. curve trajectory
b. high trajectory
c. straight trajectory
d. flat trajectory

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Answer :  b. high trajectory