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Q:

Find the work done (in J) when a charge of 20 C moves across a potential difference of 4 V.

 

 

A) 5 B) 40
C) 80 D) 10
 
Answer & Explanation Answer: C) 80

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Q:

Consider the following statements :

1. There is no net moment on a body which is in equilibrium.

2. The momentum of a body is always conserved.

3. The kinetic energy of an object is always conserved.

Which of the statements given above is/are correct?

A) 1, 2 and 3 B) 2 and 3 only
C) 1 and 2 only D) 1 only
 
Answer & Explanation Answer: C) 1 and 2 only

Explanation:

There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero.

Kinetic energy (KE) is the energy of motion, and kinetic energy is not always conserved in a collision

Energy and momentum are always conserved.

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Q:

Calculate the pressure (in Pa) if a thrust of 750 N is applied to an area of 5 m2.

 

A) 37.5   B) 150  
C) 75   D) 100
 
Answer & Explanation Answer: B) 150  

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Q:

Which of the following is based on the principle of nuclear fusion?

 

A) Atomic bomb B) Hydrogen bomb
C) Both Atomic and Hydrogen bomb D) No option is correct
 
Answer & Explanation Answer: B) Hydrogen bomb

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Q:

Find the acceleration (in m/s2) produced in a body of mass 2 kg when a force of 8 N is applied on it.

 

A) 4 B) 16
C) 8 D) 32
 
Answer & Explanation Answer: A) 4

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Q:

1 kWh = __________ × 106J.

 

A) 36 B)  3.6  
C) 6.4   D) 64
 
Answer & Explanation Answer: B)  3.6  

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Q:

The gravitational force of attraction between two bodies is ____________________ the distance between the two bodies.

 

A) inversely proportional to the B) directly proportional to the square of  
C) inversely proportional to the square of   D) directly proportional to the
 
Answer & Explanation Answer: C) inversely proportional to the square of  

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Q:

An object is placed at the centre of curvature of a concave mirror. Its image is formed at

 

A) a point beyond centre of curvature B) a point between focus and centre of curvature
C) the centre of curvature D) the focus
 
Answer & Explanation Answer: B) a point between focus and centre of curvature

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