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Q:

What is the heat generated (in J) in a heating element of resistance 800 Ω when a current of 0.2 A passes through it for 40 seconds?

 

A) 6400   B) 1280  
C) 640   D) 3200
 
Answer & Explanation Answer: B) 1280  

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Q:

If a body is whirled in a circle, then the work done on it ___.

A) is zero B) is positive
C) cannot be determined D) is negative
 
Answer & Explanation Answer: A) is zero

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Q:

Find the resistance (in mega Ω) of a wire of length 10 m, cross sectional area 1 cm2 and made of a material of resistivity 100 Ωm.

 

A) 1000   B) 20  
C)  500   D) 10
 
Answer & Explanation Answer: D) 10

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1 1040
Q:

What is the Centre of Curvature of a spherical mirror?

A) It is the centre of a hollow sphere of which the spherical mirror is a part B) It is the midpoint of a spherical mirror
C) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection D) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror
 
Answer & Explanation Answer: A) It is the centre of a hollow sphere of which the spherical mirror is a part

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Q:

Astronauts inside spaceship feel ___ weight.

A) More B) Less
C) Zero D) Depends on G force
 
Answer & Explanation Answer: C) Zero

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2 1037
Q:

Velocity of a car does not depend on

A) Speedometer B) Change in direction
C) Change in speed D) Change in acceleration
 
Answer & Explanation Answer: A) Speedometer

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2 1035
Q:

If a ball is thrown vertically upwards with a velocity of 40 m/s, then what will be the magnitude of its displacement after 6 s?

A) 80 m B) 40 m
C) 60 m D) 20 m
 
Answer & Explanation Answer: C) 60 m

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0 1035
Q:

Which of the following instruments is used to measure electric current?

A) Rheostat B) Voltmeter
C) Ammeter D) Galvanometer
 
Answer & Explanation Answer: C) Ammeter

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