Physics Questions

Q:

What will be the acceleration produced when a force of 21 N is applied on an object of mass 3 kg?

 

A) 0.7 m/s2 B) 7 m/s2
C) 0.007 m/s2 D) 70 m/s2
 
Answer & Explanation Answer: B) 7 m/s2

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Q:

Seismic waves are recorded by an instrument called the ________________.

 

A) seismograph B) odograph
C) isograph D) lithograph
 
Answer & Explanation Answer: A) seismograph

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Q:

The magnitude of the gravitational force will be equal to the _________.

 

A) product of mass and acceleration due to the gravitational force   B) ratio of mass and acceleration due to the gravitational force
C) ratio of acceleration due to the gravitational force and mass D) reciprocal of product of mass and acceleration due to the gravitational force  
 
Answer & Explanation Answer: A) product of mass and acceleration due to the gravitational force  

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Q:

When an object is thrown vertically upwards, at its maximum height its _____________.

 

A) potential energy is zero B) momentum is maximum
C) kinetic energy is zero D) gravitational force is maximum
 
Answer & Explanation Answer: C) kinetic energy is zero

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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:

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:

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:

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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