GCAT - General Cognitive Ability Mechanical Reasoning Concepts Questions and Answers

Question 1

In the gear system shown, the driver gear 'A' rotates clockwise.
Gear 'A' meshes with gear 'B'.
Gear 'B' and gear 'C' are fixed on the same axle.
Gear 'C' meshes with gear 'D'.
In which direction will gear 'D' rotate?

Accepted Answer

Clockwise.

Answer

It will not rotate.

Answer

Counter-clockwise.

Answer

The direction depends on the gear sizes.

Question 2

A lever is balanced on a fulcrum. A weight of 20 kg is placed 3 meters to the left of the fulcrum. To maintain the balance, where must a weight of 15 kg be placed?

Accepted Answer

4 meters to the right of the fulcrum.

Answer

3 meters to the right of the fulcrum.

Answer

5 meters to the left of the fulcrum.

Answer

2.25 meters to the right of the fulcrum.

Question 3

Which of the following pulley systems requires the least amount of effort (force) to lift the same load, assuming the pulleys and ropes are weightless and frictionless?

Accepted Answer

A system with one fixed and two movable pulleys.

Answer

A single fixed pulley.

Answer

A system with two fixed pulleys.

Answer

A system with one fixed and one movable pulley.

Question 4

A sealed hydraulic system operates based on Pascal's principle. If the input piston has a surface area of 5 cm² and the output piston has a surface area of 25 cm², what is the resulting output force if a force of 100 Newtons is applied to the input piston?

Accepted Answer

500 Newtons

Answer

20 Newtons

Answer

100 Newtons

Answer

2500 Newtons

Question 5

Two people need to load an identical, heavy box onto a truck bed of the same height. Person A lifts the box straight up. Person B pushes the box up a long, frictionless ramp. Which statement accurately compares the work done and the force required?

Accepted Answer

Both persons do the same amount of work, but Person A uses more force.

Answer

Person B uses less force and does less work.

Answer

Person A does less work because the distance is shorter.

Answer

Person B uses more force because the distance is longer.

Question 6

Water is flowing from a wide pipe into a narrower pipe. Assuming the flow is continuous and the pipe is horizontal, what happens to the speed and pressure of the water as it enters the narrower section?

Accepted Answer

The speed increases and the pressure decreases.

Answer

The speed decreases and the pressure increases.

Answer

The speed increases and the pressure increases.

Answer

The speed decreases and the pressure decreases.

In the gear system shown, the driver gear 'A' rotates clockwise.Gear 'A' meshes with gear 'B'.Gear 'B' and gear 'C' are fixed on the same axle.Gear 'C' meshes with gear 'D'.In which direction will gear 'D' rotate?

In the gear system shown, the driver gear 'A' rotates clockwise.
Gear 'A' meshes with gear 'B'.
Gear 'B' and gear 'C' are fixed on the same axle.
Gear 'C' meshes with gear 'D'.
In which direction will gear 'D' rotate?