Mechanical Aptitude Questions and Answers 2

Question 1

What simple machine is a screw an example of?

Accepted Answer

An inclined plane wrapped around a cylinder

Answer

A screw is an inclined plane (thread) wrapped helically around a cylinder. Each thread acts like a ramp, converting rotational motion into linear force with high mechanical advantage.

Question 2

If two gears are meshed and the driver has 15 teeth while the driven has 45 teeth, how many times does the driver rotate for each rotation of the driven gear?

Accepted Answer

3 times

Answer

The gear ratio is 45/15 = 3. The smaller driving gear must rotate 3 times to turn the larger driven gear once. This arrangement provides speed reduction and torque multiplication.

Question 3

What is the difference between speed and velocity?

Accepted Answer

Velocity includes direction, speed does not

Answer

Speed is a scalar quantity (magnitude only — how fast something moves), while velocity is a vector quantity (magnitude and direction — how fast and in what direction). An object moving at 50 km/h north has the same speed as one at 50 km/h south, but different velocities.

Question 4

What keeps a satellite in orbit around Earth?

Accepted Answer

The balance between gravity pulling it inward and its forward velocity

Answer

A satellite orbits because its forward velocity creates a tendency to fly off in a straight line, while gravity constantly pulls it toward Earth. These two effects balance perfectly so the satellite continuously falls around Earth without getting closer or farther.

Question 5

What happens to the volume of a gas when its pressure doubles (at constant temperature)?

Accepted Answer

Volume halves

Answer

According to Boyle's Law, at constant temperature, the volume of a gas is inversely proportional to its pressure (P₁V₁ = P₂V₂). Doubling the pressure halves the volume.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Questions and Answers 2