Physics [NSTSE (National Science Talent Search Exam Unified Council) Class 9]: Questions 69  75 of 285
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Question 69
Question
MCQ▾The time period of a periodic wave is . At a particular position there is a crest at . A trough will appear at this position when is equal to:
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 70
Question
MCQ▾If the velocity is increased by a factor of , then by what factor does the kinetic energy of a particle increase?
Choices
Choice (4)  Response  

a.  5  
b.  12.5  
c.  25  
d.  2.5 
Question 71
Question
MCQ▾The kinetic energy of an object of mass moving at a speed of is:
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 72
Question
MCQ▾A force acting on a body of mass displaces it through in . If initial velocity of the body is zero, then the magnitude of the force is:
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 73
Question
MCQ▾At what height from the surface of the earth will the value of acceleration due to gravity be reduced by from the value at the surface?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 74
Question
MCQ▾If a man hears thunder after he see the lightning, then how far the lightning occurs from that man?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question 75
Question
MCQ▾A ball of mass thrown upwards reaches a maximum height of calculate the work done by the force of gravity during this vertical displacement.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
