Free Mechanical Aptitude MCQ Question and Answers

Question 1

Which springs-related statement is FALSE?

Accepted Answer

Springs are a kind of simple machines

Answer

Springs are not classified as simple machines. Simple machines are basic mechanical devices like levers, pulleys, inclined planes, wheels and axles, wedges, and screws, which change the direction or magnitude of a force. Springs are energy storage devices that deform under load and return to their original shape, converting mechanical energy into potential energy.

Question 2

What distinguishes a cell from a capacitor most significantly?

Accepted Answer

A capacitor builds up charges on its plates, whereas a cell provides the force necessary to make charges flow through the circuit.

Answer

A capacitor is a passive electronic component that stores electrical energy in an electric field by accumulating electric charge on two conductive plates separated by a dielectric. A cell (or battery), on the other hand, is an active component that converts chemical energy into electrical energy, providing a continuous electromotive force (voltage) to drive current through a circuit. While both store energy, their mechanisms and primary functions are distinct.

Question 3

Which assertion concerning air pressure is TRUE?

Accepted Answer

Less than 1 atm of air pressure is present 100 kilometers above sea level.

Answer

Air pressure decreases significantly with increasing altitude because there is less air above to exert pressure. At sea level, the pressure is approximately 1 atmosphere (atm). At 100 kilometers above sea level, which is well into the Earth's atmosphere but still very high, the air is extremely thin, resulting in a pressure far less than 1 atm.

Question 4

What is the rate of rotation of the Earth's surface, expressed in kilometers per hour? The Earth has a 6370 km radius. Assign a whole number as the answer.

Accepted Answer

1667 km/h

Answer

To calculate the speed of rotation at the Earth's equator, we find the circumference (2 * pi * radius) and divide it by the time for one rotation (24 hours). With a radius of 6370 km, the circumference is approximately 40023.8 km. Dividing this by 24 hours gives approximately 1667.66 km/h, which rounds to 1667 km/h.

Question 5

What value stays the same throughout a ballistic trajectory?

Accepted Answer

Acceleration

Answer

In a ballistic trajectory, assuming negligible air resistance, the only significant force acting on the object is gravity. Therefore, the acceleration remains constant throughout the trajectory, equal to the acceleration due to gravity (approximately 9.8 m/s² downwards). Velocity changes continuously in both magnitude and direction, and distance is constantly increasing.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Free Mechanical Aptitude MCQ Question and Answers