Q.71)-A cannon ball is fired. The motion of this ball is an example of
  • Straight line motion
  • Projectile motion
  • Hperbolic motion
  • Horizontal motion
Q.72)-Upward force on a floating body is called
  • Jerk
  • Buoyancy
  • Archimedal force
  • Anti-gravity
Q.73)-When a bus starts suddenly, then passengers in the bus tend to fall backwards. This event is an example of
  • Inertia of rest
  • Inertia of motion
  • Inertia of direction
  • None of these
Q.74)-Which of the following quantity is a measure of inertia?
  • Velocity
  • Acceleration
  • Mass
  • Weight
Q.75)-Friction can be reduced by which of the following? I.Polising surfaces II. Use of lubricants III. Decreasing area of contact
  • Only I
  • Only II
  • Only I and II
  • All options are correct
Q.76)-Action and reaction
  • Always act on same body
  • Are equal in magnitude
  • Are in same direction
  • Always act independently
Q.77)-Law of Inertia is also known as
  • Newton's first law of motion
  • Newton's second law of motion
  • Newton's third law of motion
  • None of these
Q.78)-Which scientist gave 'laws of motion'?
  • Galileo
  • Newton
  • Einstein
  • Boyle
Q.79)-The force acting on an object perpendicular to the surface is called
  • Pressure
  • Work
  • Thrust
  • Friction
Q.80)-Which contact force is responsible for changing the state of motion of an object?
  • Magnetic force
  • Frictional force
  • Muscular force
  • Electrostatic force