Physics - MCQs

Inertia of a body depends on

• weight of the object
  

• acceleration due to gravity of the planet
  

• mass of the object
  

• Both a & b
  

Impulse is equals to

• rate of change of momentum
  

• rate of force and time
  

• change of momentum

  
  

• rate of change of mass

  
  

Newton’s III law is applicable

• for a body is at rest
  

• for a body in motion
  

• both bodies at rest and in motion

  
  

• only for bodies with equal masses

  
  

Plotting a graph for momentum on the X-axis and time on Y-axis. Slope of momentum-time graph gives

• Impulsive force

  
  

• Acceleration

  
  

• Force

  
  

• Rate of force

  
  

In which of the following sport the turning of effect of force used

• swimming

  
  

• tennis

  
  

• cycling

  
  

• hockey

The unit of ‘g’ is m s-2. It can be also expressed as

• cm s-1

  
  

• N kg-1

  
  

• N m2 kg-1

  
  

• cm2 s-2

  
  

One kilogram force equals to

• 
  9.8 dyne

• 9.8 × 10^4 N

• 98 × 10^4 dyne

• 980 dyne

The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be ------- kg

• 4M

• 2M

• M/4

• M

If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

• decrease by 50%
  

• increase by 50%
  

• decrease by 25%

  
  

• increase by 300%

  
  

To project the rockets which of the following principle(s) is /(are) required?

• Newton’s third law of motion
  

• Newton’s law of gravitation
  

• law of conservation of linear momentum
  

• Both Newton's third law of motion and low of conservation of linear momentum