Physics Questions And Answers 167- 181

167. Increasing force tends to ____while increasing mass tends to ___
a. Increase acceleration, decrease acceleration
b. Increase acceleration, increase acceleration
c. Decrease acceleration, increase acceleration
d. Decrease acceleration, decrease acceleration


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ANSWER: a. Increase acceleration, decrease acceleration



168. According to Bohr’s atom model, the angular momentum of the electron in its non-radiating orbit is in integer multiple of the quantity
a. h/4p
b. h/2p
c. 2p/h
d. h/p

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ANSWER : : h/2p




169. On which one of the following conservation laws, does a rocket work?  
A.  Mass
B.  Energy
C.  Linear momentum
D.  Angular momentum

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Answer : D.  Angular momentum


170. The presence of charge on a substance can be confirmed by a   
a. Electrodes
b. Ammeter
c. Thermometer
d. Gold Leaf Electroscope 


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Answer : D.



171. Sound wane in air are -
A.  Transverse
B.  Longitudinal
C.  Electromagnetic
D.  Polarised

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Answer : B.  Longitudinal




172. The motion of a projectile follows a?
a.   vertical path.
b.   spinning path.
c.   straight path.
d.   curved path.

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Answer : d.   curved path.



173. Name the device for detecting and measuring small amount thermal energy :
a. barretter
b. pyrometer
c. pyranometer
d. bolometer

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Answer : d. bolometer



174. What is the value of acceleration of a body moving with constant velocity?
A. One                                  
B. Two                                  
C. Three                               
D. Zero

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Ans. D



175. Which instrument is used in submarine to see the objects above sea level ?
a. Pykometer
b. Polygraph
c. Photometer
d. Periscope

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Answer: Option D
Explanation:
Pykometer - used to determine the density and coefficient of expansion of liquids,
Polygraph - used to record changes in heartbeat, blood-pressure and respiration,
Photometer - used to compare luminous intensity of the source of light.




176. Which one of the following common devices works on the basis of the principle of mutual induction?  
A.  Tubelight
B.  Transformer
C.  Photodiode
D.  Led

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Answer : B.  Transformer





177. Nuclear sizes are expressed in a unit named
A. Fermi
B. angstrom
C. newton
D. tesla

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Answer: A
Fermi - A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.



178. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because  
A) the ringing is not loud enough
B) the glass of the bell jar absorbs the sound waves
C) the bell jar is too small
D) there is no air or any other gas in the bell jar

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Answer: D) there is no air or any other gas in the bell jar 
Explanation:
As there is no medium inside the bell jar, sound cannot travel




179. Which one of the following is used as a moderator in nuclear reactor
A. radium
B. graphite
C. thorium
D. ordinary water

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Answer: B. graphite



180. Temperature can be expressed as derived quantity in terms of any of the following
A) length and mass
B) mass and time
C) length,mass and time
D) in terms of none

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Answer: D) in terms of none 



181. The minimum number of Non zero non collinear vectors required to produce a zero vector is
A) 3
B) 2
C) 4
D) 1

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Answer: A) 3