Free DAA Mechanical Comprehension: Levers and Pulleys Questions and Answers

Question 1

A seesaw is a classic example of which class of lever?

Accepted Answer

Class 1 Lever

Answer

A Class 1 lever has the fulcrum (pivot point) positioned between the effort and the load. On a seesaw, the pivot is in the middle, with the effort (person pushing down) on one side and the load (person on the other side) on the other.

Question 2

What is the ideal mechanical advantage (IMA) of a single fixed pulley?

Accepted Answer

1

Answer

A single fixed pulley does not multiply the force applied; it only changes the direction of the force. Therefore, the effort required to lift the load is equal to the weight of the load, giving it a mechanical advantage of 1.

Question 3

A wheelbarrow is an example of which class of lever?

Accepted Answer

Class 2 Lever

Answer

A Class 2 lever has the load positioned between the fulcrum and the effort. In a wheelbarrow, the wheel's axle is the fulcrum, the load is in the basin, and the effort is applied at the handles.

Question 4

In a pulley system, a load of 100N is lifted by an effort of 25N. What is the mechanical advantage of the system?

Accepted Answer

4

Answer

Mechanical Advantage (MA) is calculated by dividing the Load by the Effort (MA = Load / Effort). In this case, MA = 100N / 25N = 4. This means the pulley system multiplies the applied force by four times.

Question 5

A fishing rod, when casting a line, functions as which class of lever?

Accepted Answer

Class 3 Lever

Answer

A Class 3 lever has the effort applied between the fulcrum and the load. When casting a fishing rod, one hand acts as the fulcrum at the end of the rod, the other hand applies the effort in the middle, and the load is the weight of the line and lure at the tip.

DAA - Defence Aptitude Assessment Practice Test

DAA - Defence Aptitude Assessment Practice Test

Free DAA Mechanical Comprehension: Levers and Pulleys Questions and Answers