Friction and Forces MCQ

Test your knowledge with important Friction and Forces MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Friction and Forces MCQs at Bissoy

• The driver of a three wheeler with a speed of 36km/h sees a child in the middle of the road and brings his vehicle to rest in 4s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400kg and the mass of the driver is 65kg.
  ক

  116.25 N

  খ

  2122 N

  গ

  1162.5 N

  ঘ

  212.2 N
• What is the magnitude of the net force acting a kite skilfully held stationary in the air?
  ক

  Zero

  খ

  Infinity

  গ

  Constant

  ঘ

  Cannot be predicted
• The speed of driving a car safely depends on ___________
  ক

  Capacity of the car

  খ

  Fuel in the tank

  গ

  Inflation of tyre

  ঘ

  Headlight range
• It is easier to catch a tennis ball than a cricket ball even when both are moving with the same velocity.
  ক

  True

  খ

  False
• A Bucket containing water is going in a vertical circle. The water ___________
  ক

  Falls drop by drop

  খ

  Falls all at once

  গ

  Does not fall

  ঘ

  Only upper half of the water is lost
• A stone tied at the end of a string is whirled in a circle. When the string breaks, the stone ___________
  ক

  Falls down vertically

  খ

  Flies upwards

  গ

  Takes a non-uniform path and falls to ground

  ঘ

  Flies away tangentially
• Friction is a non-conservative force.
  ক

  True

  খ

  False
• When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion.
  ক

  True

  খ

  False
• There is some water in a beaker placed on the pan of a spring balance. If we dip our finger in this water without touching the bottom of the beaker ___________
  ক

  The reading will be the same

  খ

  The reading will increase

  গ

  The reading drops to zero

  ঘ

  The beaker falls down
• It is difficult to put a cycle into motion than to maintain the motion because of ___________
  ক

  Limiting friction

  খ

  Kinetic friction

  গ

  Rolling friction

  ঘ

  Static friction
• Which of the brakes are effective on a bicycle?
  ক

  Small ones

  খ

  Bigger ones

  গ

  Both small and big

  ঘ

  Neither small nor big
• The fuel in the vehicle can be saved by ___________
  ক

  Not using vehicle often

  খ

  Mixing water with fuel

  গ

  Cleaning the vehicle

  ঘ

  Properly inflating the tyres
• When a man jumps down for a height of several storeys into a stretched tarpaulin, he receives no injury.
  ক

  True

  খ

  False
• A bird is sitting on the floor of a wire cage and the cage is in the hand of a boy. The bird starts flying in the cage. The boy will ___________
  ক

  Also experience the flying feel

  খ

  Will not feel anything different

  গ

  Feel the weight of the cage has become lighter

  ঘ

  Feel no change in weight of the cage
• A soda-water bottle is falling freely. The bubbles of the gas rise in the water of the bottle.
  ক

  True

  খ

  False
• An astronaut is suddenly thrown out of his small spaceship accelerating in interstellar space at a constant rate of 100/s2. What is the acceleration of the astronaut the instant after he is outside the spaceship? Assuming there are no nearby stars.
  ক

  200m/s2

  খ

  100 m/s2

  গ

  Zero

  ঘ

  400 m/s2
• A stone, when thrown on a glass window, smashes the windowpane to pieces, but a bullet from the gun passes through making a clean hole. Why?
  ক

  Due to the large size of the stone

  খ

  Depends on the material of the window

  গ

  Because of the force

  ঘ

  Because of the small speed of the stone
• A man jumping out of a moving train ___________
  ক

  Lands on the ground

  খ

  Falls with his head forward

  গ

  Will start rolling on the ground

  ঘ

  Falls with this head backward
• A body in linear motion can never be in equilibrium.
  ক

  True

  খ

  False
• A train has to negotiate a curve of radius 400m. By how much should the putter rail be raised with respect to inner rail for speed of 48 km/h? The distance between the rails is 1m.
  ক

  0.20m

  খ

  0.0454m

  গ

  0.45m

  ঘ

  0.020m
• When moving along a curved path, he ___________
  ক

  Leans inwards

  খ

  Leans outwards

  গ

  Is still

  ঘ

  Leans sideways
• Friction can be increased by ___________
  ক

  Using air cushion

  খ

  Lubricants

  গ

  Using sand

  ঘ

  Using ball bearings
• How is friction due to air reduced?
  ক

  Streamlining

  খ

  Lubrication

  গ

  By using ball bearings

  ঘ

  By polishing
• A scooter weighs 120kg f. Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4.
  ক

  60kg f

  খ

  48kg f

  গ

  25kg f

  ঘ

  32kg f
• A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?
  ক

  0.814

  খ

  0.27

  গ

  1.5

  ঘ

  3.5
• A cubical block rests on an inclined plane of μ = 1/√3, determine the angle of inclination when the block just slides down the inclined plane?
  ক

  40°

  খ

  50°

  গ

  30°

  ঘ

  20°
• Which of the following kinetic friction is smaller?
  ক

  Limiting friction

  খ

  Static friction

  গ

  Rolling friction

  ঘ

  Sliding friction
• The coefficient of static friction is ___________
  ক

  Less than the coefficient of kinetic friction

  খ

  Greater than the coefficient of limiting friction

  গ

  Equal to the coefficient of kinetic friction

  ঘ

  Equal to the tangent of the angle of friction
• The coefficient of kinetic friction is less than the coefficient of static friction.
  ক

  True

  খ

  False