Physics Questions And Answers 154 - 166

154. The acceleration of an object is ____
a. Directly proportional to force
b. Inversely proportional to mass
c. Directly proportional to force and inversely proportional to mass
d. Directly proportional to mass and indirectly proportional to force

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ANSWER: c. Directly proportional to force and inversely proportional to mass



155. The nucleus is a sphere of radius about
a. 10-11 m
b. 10-12 m
c. 10-13 m
d. 10-14 m

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ANSWER : : 10-14 m



156. What element’s three isotopes have different names?  
A. Helium
B. Oxygen
C. Carbon
D. Hydrogen

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Answer : D. Hydrogen




157. A freely suspended magnet always aligns itself along the  
a. East South Axis
b. North South Axis 
c. East West Axis
d. West South Axis

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Answer :  North South Axis


158. Which of the following is not a good heat insulator?   
a. Wood
b. Iron Right!
c. Wool
d. Feathers

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Answer : Iron




159.  Which one of the following quantities does not have the unit?
A.  Stress
B.  force
C.  Strain
D.  Pressure

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Answer : C.  Strain



160.   A player making a long jump is an example of?
a.   Rotatory motion.
b.   Projectile motion.
c.   Spinning motion.
d.   Horizontal motion.

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Answer : B  Projectile motion.


161. An instrument for measuring focal length of a lens is called : 
a. focometer
b. goniometer
c. heliometer
d. spherometer

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Answer : a. focometer



162.  The Electric circuit which changes its direction at regular intervals of time is called ___
A. Alternating Current   
B. Direct Current              
C. Three phase current  
D. All the above

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Ans. A



163.  Electric fuse wire is made of alloys because alloys -
1. Have low melting point
2. Have high melting point
3. Are economical
4. Do not get heated easily

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Ans: 1  



164. Which instrument is used to measure the power of electric circuit ?
a. Voltmeter
b. Wattmeter
c. Wavemeter
d. Viscometer

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Answer: Option B
Explanation:
Voltmeter - is used to measure electric potential difference between two points,
Wavemeter - is used to measure the wavelength of a radiowave,
Viscometer - is used measure viscosity of liquid.



165. A piece of stone and or iron traveling through space that moves through the earth’s atmosphere is  
A.  Planet
B.  Sun
C.  Moon
D.  Meteor

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Answer : D.  Meteor



166. Power reactor is located in Tamil Nadu at
 A. Kalpakkam
B. Sriharikota
C. Tuticorn
D. Pudukottai

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Answer: A. Kalpakkam