Question 1

A lever of length 2 m has its fulcrum at 0.5 m from the load end. If a force of 100 N is applied at the free end, what is the mechanical advantage of this lever?

Accepted Answer

Mechanical advantage = Effort arm ÷ Load arm = 1.5 m ÷ 0.5 m = 3.

Question 2

In a pulley system, if a movable pulley is used to lift a load of 200 N, what minimum effort force is required (neglecting friction and pulley weight)?

Accepted Answer

A single movable pulley provides a mechanical advantage of 2, so effort = Load ÷ 2 = 200 ÷ 2 = 100 N.

Question 3

A wedge is used to split wood. Which statement correctly describes the relationship between the angle of the wedge and its mechanical advantage?

Accepted Answer

A sharper wedge (smaller angle) concentrates force over a smaller area, resulting in higher mechanical advantage and greater splitting ability.

Question 4

A screw with a pitch of 2 mm is rotated 10 complete turns to fasten it into wood. What is the linear displacement of the screw?

Accepted Answer

Linear displacement = Pitch × Number of turns = 2 mm × 10 = 20 mm.

Question 5

A lever of length 2 m has its fulcrum at 0.5 m from the load end. If a load of 100 N is placed at the load end, what effort is needed to balance it (assuming a massless lever)?

Accepted Answer

Using the principle of moments (load × load arm = effort × effort arm): 100 × 0.5 = effort × 1.5, so effort = 33.33 N.

Question 6

Which type of simple machine is represented by a staircase?

Accepted Answer

A staircase is an application of an inclined plane, which reduces the effort needed to move objects vertically by spreading the effort over a longer distance.

Question 7

A movable pulley system has a mechanical advantage of 4. If the load is 400 N, what is the minimum effort required to lift it (ignoring friction)?

Accepted Answer

Mechanical advantage = Load ÷ Effort; therefore, Effort = Load ÷ Mechanical Advantage = 400 ÷ 4 = 100 N.

Question 8

A wedge is used to split wood. Which principle of simple machines does it apply?

Accepted Answer

A wedge is a modified inclined plane that converts a vertical or axial force into lateral splitting forces, enabling efficient wood splitting.

Question 9

In a screw, the mechanical advantage depends on which of the following?

Accepted Answer

A screw's mechanical advantage is determined by the ratio of its circumference to its pitch (distance advanced per complete turn), both related to radius and pitch.

Question 10

A lever of class 1 has a load of 100 N at a distance of 2 m from the fulcrum. If the effort is applied at a distance of 5 m from the fulcrum, what is the mechanical advantage of this lever?

Accepted Answer

Mechanical Advantage (MA) = Effort arm / Load arm = 5 m / 2 m = 2.5.

Question 11

A movable pulley system is used to lift a load of 600 N. If the efficiency of the system is 75% and the mechanical advantage is 4, what is the effort force required?

Accepted Answer

Effort = (Load / MA) / Efficiency = (600 / 4) / 0.75 = 150 / 0.75 = 200 N.

Question 12

An inclined plane has a length of 10 m and a height of 2 m. What is the ideal mechanical advantage of this inclined plane, assuming it is frictionless?

Accepted Answer

Ideal Mechanical Advantage of inclined plane = Length / Height = 10 m / 2 m = 5.

Agniveer Army Clerk SKT Simple Machines

Simple Machines — Practice Questions