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Q:

Calculate the current flowing through a resistor of 10 ohm when a potential difference of 140 v is applied across it.

A) 14 amp B) 140 amp
C) 1400 amp D) 1.4 amp
 
Answer & Explanation Answer: A) 14 amp

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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:

What does Coulomb's Law state?

A) The magnitude of the force of attraction (or repulsion) between two point charges is inversely proportional to the product of quantity of the two charges as well as to the square of the distance between them.   B) The magnitude of the force of attraction (or repulsion) between two point charges is directly proportional to the product of the quantity of the two charges and inversely proportional to the square of the distance between them.  
C) The magnitude of the force of attraction (or repulsion) between two point charges is directly proportional to the product of the quantity of the two charges and directly proportional to the square of the distance between them. D) The magnitude of the force of attraction (or repulsion) between two point charges is directly proportional to the product of the quantity of the two charges and to the square of the distance between them.
 
Answer & Explanation Answer: B) The magnitude of the force of attraction (or repulsion) between two point charges is directly proportional to the product of the quantity of the two charges and inversely proportional to the square of the distance between them.  

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Q:

In a concave mirror when the object is placed at infinity which of the following applies to the image?

A) Real, inverted, highly enlarged image at center of curvature (C) B) Real, inverted image of the same size at centre of curvature (C)
C) Real, inverted, diminished image between centre of curvature (C) and principal focus (F) D) Real, inverted, highly diminished image at focus
 
Answer & Explanation Answer: D) Real, inverted, highly diminished image at focus

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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:

What does the symbol R in electricity stand for ?

A) Resistance B) Resonance
C) Refraction D) Rarefaction
 
Answer & Explanation Answer: A) Resistance

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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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Q:

What of the given below devices converts chemical energy to electrical energy?

A) Transformer B) Battery
C) Electric Generator D) Wheel
 
Answer & Explanation Answer: B) Battery

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