Engineering Mechanics_CCA_Unit 5

Your Division

Roll no

What is the inclination of a smooth inclined plane such that the accelerating force acting on a block sliding down it may be g/2?

• 30°
• 45°
• 60°
• 75°

The acceleration of a block sliding down an inclined plane is

• same as acceleration due to gravity
• less than acceleration due to gravity
• greater than acceleration due to gravity
• uniformly increasing

Two blocks A and B such that WA > WB slide down an inclined plane at the same time. If the coefficient of friction is same for both then which of the following statements is true?

• Acceleration of A is greater than acceleration of B.
• Acceleration of A is lesser than acceleration of B.
• Both the accelerations are equal
• Their accelerations are equal to acceleration due to gravity.

When a lift is accelerating downwards, the weight of a man standing on the floor of the lift is

• same as that when on ground
• greater than that on ground
• less than that on ground
• zero

When a car moves over a bump, the pressure exerted by the wheels on the road is

• same as that when on ground
• greater than that on ground
• less than that on ground
• zero

When a stone tied to one end of a string is whirled in a vertical circle, the tension in the string is maximum at

• the lowest point
• the highest point
• mid-height
• 45° to the vertical

When a stone tied to one end of a string is whirled in a vertical circle, the tension in the string is the least at

• the lowest point
• the highest point
• mid-height
• 45° to the vertical

Work energy method relates

• force, acceleration and time
• force, velocity and time
• force, velocity and displacement
• force, displacement and time