Class 8 Force And Pressure CBSE Questions & Answers

Class 8 · Force And Pressure

This is Science Class 8 Force and Pressure CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
If the force applied on a moving body in direction of motion than
  • A
    Mass of the body decreases
  • B
    Speed of body decreases
  • C
    Mass of the body increases
  • D
    Speed of body increases
    Correct
2
When batsman hits the ball, it changes its
  • A
    Shape and size
  • B
    Direction as well as speed
    Correct
  • C
    Changes its speed only
  • D
    Changes its direction only
3
How much force is applied on a body of mass 10 kg to increase its acceleration by 2m/s?
  • A
    20 N
    Correct
  • B
    10 N
  • C
    5 N
  • D
    12 N
4
A body moving on leveled grounds need to apply constant force to
  • A
    Gravitational force
  • B
    Magnetic force of earth
  • C
    Contact force
  • D
    Overcome frictional force
    Correct
5
The direction in which swimmer applies the force to move forward is
  • A
    Backward direction
    Correct
  • B
    Left direction
  • C
    Right direction
  • D
    Forward direction
6
When action and reactions forces are equal and opposite, why don
  • A
    Because they have unequal mass
  • B
    Because they are acting on two different bodies
    Correct
  • C
    Because they have same direction
  • D
    Because they are in state of rest
7
A force produces an acceleration of 5m/s when applied on a body of mass 4kg. The magnitude of force applied is
  • A
    20 N
    Correct
  • B
    1.25N
  • C
    10 N
  • D
    25 N
8
Which force is responsible for stability of our universe?
  • A
    The force of gravitation
    Correct
  • B
    Magnetic force of Sun
  • C
    Magnetic force of earth
  • D
    Frictional force between planets and atmosphere
9
Truck or motor-bus has much wider tyres to
  • A
    Decrease the energy consumption
  • B
    Increase pressure on road
  • C
    Decrease the weight of truck
  • D
    Decrease pressure on road
    Correct
10
Lactometer is used to
  • A
    Determine the purity of sample of milk
    Correct
  • B
    Determine the fat concentration in milk
  • C
    Determine the presence of toxic substance in milk
  • D
    Determine the volume of milk
11
A perpendicular force of 50 N is acting on a circular plate of radius 7cm. The pressure acting on plate will be
  • A
    100 Pa
  • B
    1000 Pa
  • C
    10 Pa
  • D
    3246.75 Pa
    Correct
12
At higher altitude, nose bleeding is common problem because
  • A
    Atmospheric pressure is less at higher altitude
    Correct
  • B
    Atmospheric pressure is more at higher altitude
  • C
    Blood pressure decreases at higher altitude
  • D
    Blood pressure increase at higher altitude
13
Muscular force: contact force :: magnetic force : ?
  • A
    Non-contact force
    Correct
  • B
    Surface force
  • C
    Contact force
  • D
    Molecular force
14
Astronauts wear special suits when they go into space because pressure inside the suit is maintained
  • A
    Variable pressure
  • B
    Very low pressure
  • C
    At atmospheric pressure
    Correct
  • D
    At Body pressure
15
A boy having area of 70 cm sq. exerts a pressure of 7N/cm sq. on the ground. The Force acting on the ground will be
  • A
    10 N
  • B
    77 N
  • C
    490 N
    Correct
  • D
    100 N