Physics Questions And Answers 210-223

210. According to Newton’s second law of motion acceleration of an object is dependent upon two variables. Which are those two variables?
a. The net force acting upon the object and the mass of the object
b. The total force acting upon the object and the mass of the object
c. The net force acting upon the object and the velocity of the object
d. None of the above


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ANSWER: a. The net force acting upon the object and the mass of the object



211. An atom emits a photon when one of its orbital electrons
a. jumps from a higher to a lower energy level
b. jumps from a lower to a higher energy level
c. is removed by the photoelectric effect
d. is at rest

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ANSWER : : jumps from a higher to a lower energy level


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

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Answer : D.  Methane



213. What is the name given to the band of seven colors formed by splitting of light by a prism?  
a. Color Band
b. Spectrum Right!
c. Color Arc
d. Prism Band

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Answer : Spectrum


214. Force of gravity is least at -
A.  The equator
B.  The pole
C.  Between equator and pole
D.  None of these

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Answer : A.  The equator



215. The path followed by a projectile is called its?
a.   Territory
b.   Treasury
c.   Tractor
d.   Trajectory

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Answer : d. Trajectory


216.  What is the technique for reproducing a stereoscopic image without a lens or a camera ? 
a. thermography
b. chromatography
c. stereography
d. holography

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Answer : d. holography



217. What is the unit for Viscosity?
A. Coulomb                                                                                        
B. newton second per square meter
C. watt per meter per degree Celsius                                    
D. joule per kilogram per kelvin

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Ans. B



218. The speed of sound in water is four times its speed in air. When a sound wave of frequency 'n' and wavelength '?' 
enters from air into water, then its frequency and wavelength will respectively become -
1. 4n and ?
2. n and 4?
3. 2n and ?
4. None of these

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Ans: 2


219. Which instrument is used to measure the scattering of light by particles suspended in a liquid ?
a. Nephetometer
b. Ohmmeter
c. Ondometer
d. Pyrometer

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Answer: Option A
Explanation:
Ohmmeter - is used to measure electrical resistance in ohms,
Ondometer - is used to measure frequency of electromagnetic waves,
Pyrometer - is used to measure very high temperature.



220.  A moderator is used in nuclear reactors in order to  
A.  increase the no.of.neutrons
B.  decrease the no.of.neutrons
C.  slow down the speed of neutrons
D.  Anthony S. D’Mello

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Answer : C.  slow down the speed of neutrons



221.   Light from the Sun reaches us in nearly
A. 2 minutes
B. 4 minutes
C. 8 minutes
D. 16 minutes

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Answer: C



222.  Ball bearings are used in cycles, scooters etc to
A) Increase the friction between the wheel and the axle
B) Reduce the friction between the wheel and the axle
C) Reduce the friction between ground and the whee
D) None of the above

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Answer: B) Reduce the friction between the wheel and the axle 



223. A woman’s voice is shriller than man’s voice due to
A. lower frequency
B. higher frequency
C. weak vocal chords
D. higher amplitude

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Answer: B. higher frequency