Chapter-1 Force (Revision Test)

1 dyne.cm is equal to

• 10⁷ N.m

• 10^-7 N.m

• 10⁵ N.m

• 10^-5 N.m

It is easier to turn a steering wheel of large diameter than that of smaller diameter. Because......

• there will be more torque in steering wheel

• there will be less torque in steering wheel

• less force will be required to rotate the steering wheel

• more force will be required to rotate the steering wheel

Centre of gravity of an object depends on the........

• Shape of the object

• material of the object

• distribution of mass in the body

• none of these

When a stone tied with a string describes the uniform circular motion then centripetal acceleration acts.......

• along the tangent of the circular path opposite to direction of motion

• along the tangent of the circular path in the direction of motion

• along the string and directed towards the centre of rotation

• along the string and directed away from the centre of rotation

Centre of gravity of a hollow cone of height 'h' from its base will be....

• h/3

• h/4

• 2h/3

• 3h/3

A force of 100 N is required to open a nut while using a lever handle of length 1 m. How much force will be required to open the same nut using a lever handle of length 25 cm.

• 25 N

• 50 N

• 200 N

• 400 N

When a body describes uniform circular motion then which physical quantity remains constant

• Velocity

• linear momentum

• speed

• both speed and velocity

A wheel has the diameter 1m. If 200 N.m torque is required to rotate it then the minimum force required to rotate it is

• 100 N

• 200 N

• 300 N

• 400 N

A uniform half metre rule can be balanced at the 29 cm mark when a mass 40 g is hung from its one end. Calculate the mass of the half metre rule

• 105 g

• 110 g

• 200 g

• 210 g

A body is pivoted at a point and a force of 100 N is applied at a distance 20 cm from it. Calculate the moment of force

• 2000 N.m

• 200 N.m

• 20 N.m

• 2 N.m