GCAT Mechanical Reasoning Concepts 3

Question 1

A 10 kg object is accelerated at 3 m/s². What net force is acting on it?

Accepted Answer

30 N

Answer

Newton's second law: F = ma = 10 × 3 = 30 N.

Question 2

Which type of lever has the fulcrum between the effort and the load?

Accepted Answer

First-class lever

Answer

A first-class lever has the fulcrum between effort and load, like a seesaw or crowbar.

Question 3

A car engine produces 150 kW of power and propels the car at 30 m/s. What is the driving force on the car?

Accepted Answer

5000 N

Answer

Power = force × velocity; force = P/v = 150,000 / 30 = 5000 N.

Question 4

A shaft transmits torque from a motor to a wheel. If the shaft's diameter is doubled, by what factor does its torsional strength increase (approximately)?

Accepted Answer

16×

Answer

Torsional strength scales with the fourth power of diameter; 2⁴ = 16×.

Question 5

Ball bearings are used in rotating machinery primarily to:

Accepted Answer

Reduce friction and support radial loads

Answer

Ball bearings replace sliding friction with rolling friction, greatly reducing energy loss while supporting loads.

GCAT - General Cognitive Ability Test Practice Test

GCAT - General Cognitive Ability Test Practice Test

GCAT Mechanical Reasoning Concepts 3