General Science Class 9 MCQS

Friction opposes motion between two bodies in contact because of :

1. Charges on bodies
2. Weight of bodies
3. Roughness of surfaces
4. None of above

Which statement is true for limiting frictional force?

1. It is greater than rolling friction
2. It is greater than sliding friction
3. It is greater than kinetic friction
4. All are true

A pair of unlike parallel forces having different lines of force produce :

1. Equilibrium
2. Torque
3. A couple
4. Unstable equilibrium

Head to tail rule can be used to add ______ forces.

1. Two
2. Three
3. Five
4. Any number of

A force of 15 N makes an angle of 60° with horizontal. Its vertical component will be :

1. 15 N
2. 10 N
3. 13 N
4. 7 N

A body is in equilibrium when it has :

1. Uniform speed
2. Uniform acceleration
3. Both a and b
4. Zero acceleration

A body is in neutral equilibrium when its center of gravity :

1. Is at the lowest position
2. Remains at same height
3. Is at highest position
4. Is at its base

Bunsen burner is made stable by :

1. Increasing its length
2. Increasing its mass
3. Decreasing its base area
4. Increasing its base area

A right rope walker carries a long pole to :

1. Increase his weight
2. Raise his centre of gravity
3. Lower his centre of gravity
4. Keep his centre of gravity in fixed position

Stability of a racing car is increased by :

1. Increasing its height
2. Raising its centre of gravity
3. Decreasing its width
4. Lowering its centre of gravity