Introduction to Mechanical Principles: Master the Basics of Mechanics

Question 1

The SI unit of force is:

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Pascal

Question 2

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an external:

Accepted Answer

Force

Answer

Acceleration

Answer

Mass

Answer

Energy

Question 3

Which of the following is not a type of mechanical energy?

Accepted Answer

Nuclear energy

Answer

Potential energy

Answer

Kinetic energy

Answer

Elastic energy

Question 4

The rate at which work is done is called:

Accepted Answer

Power

Answer

Energy

Answer

Force

Answer

Velocity

Question 5

The principle of moments states that for a body to be in equilibrium, the:

Accepted Answer

Sum of clockwise moments must equal the sum of anticlockwise moments

Answer

Sum of forces acting on the body must be zero

Answer

Centre of gravity must be below the point of support

Answer

Moment of inertia must be minimized

Question 6

The efficiency of a hydraulic pump is:

Accepted Answer

The ratio of output power to input power

Answer

The ratio of input power to output power

Answer

The ratio of output flow rate to input flow rate

Answer

The ratio of input flow rate to output flow rate

Question 7

Which of the following is NOT a fundamental principle of mechanics?

Accepted Answer

Chemistry

Answer

Force

Answer

Motion

Answer

Power

Question 8

What is the standard international unit of force?

Accepted Answer

Newton (N)

Answer

Joule (J)

Answer

Watt (W)

Answer

Metre per second (m/s)

Question 9

Which equation is known as Newton's second law of motion?

Accepted Answer

F = ma

Answer

E = mc^2

Answer

P = IV

Answer

F = Gm1m2/r^2

Question 10

Which of the following is NOT a type of mechanical energy?

Accepted Answer

Chemical energy

Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Elastic potential energy

Question 11

What is the fundamental principle of energy conservation?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Answer

Energy is lost in every process.

Answer

Energy can be created but not destroyed.

Answer

Energy is destroyed but not created.

Question 12

What is the primary purpose of a gear train?

Accepted Answer

To alter the speed or torque of a rotating shaft.

Answer

To convert rotary motion into linear motion.

Answer

To amplify force.

Answer

To create a mechanical advantage.

Question 13

Which of the following is **not** a fundamental principle of mechanics?

Accepted Answer

Time

Answer

Force

Answer

Motion

Answer

Energy

Question 14

According to Newton's Second Law of Motion, the force acting on an object is directly proportional to its:

Accepted Answer

Acceleration

Answer

Displacement

Answer

Mass

Answer

Velocity

Question 15

The potential energy possessed by an object is dependent on its:

Accepted Answer

Position and mass

Answer

Mass and velocity

Answer

Height and acceleration

Answer

Volume and density

Question 16

Which of the following energy transformations occurs when a generator converts mechanical energy into electrical energy?

Accepted Answer

Mechanical to electrical

Answer

Chemical to thermal

Answer

Electrical to mechanical

Answer

Thermal to chemical

Question 17

Which of the following is a type of friction that occurs when two surfaces are not moving relative to each other?

Accepted Answer

Static friction

Answer

Kinetic friction

Answer

Rolling friction

Answer

Fluid friction

Question 18

The moment of inertia of an object is a measure of its resistance to:

Accepted Answer

Angular acceleration

Answer

Linear acceleration

Answer

Energy storage

Answer

Force application

Question 19

The work done by a force acting on an object is given by:

Accepted Answer

The dot product of force and displacement

Answer

The cross-product of force and velocity

Answer

The sum of force and displacement

Answer

The difference between force and acceleration

Question 20

In thermodynamics, entropy is a measure of a system's:

Accepted Answer

Disorder

Answer

Energy

Answer

Temperature

Answer

Pressure

Question 21

Which of the following is **not** a type of heat transfer?

Accepted Answer

Mass transfer

Answer

Conduction

Answer

Convection

Answer

Radiation

Question 22

In the International System of Units (SI), force is measured in:

Accepted Answer

Newtons (N)

Answer

Watts (W)

Answer

Joules (J)

Question 23

Which of the following physical quantities is a scalar?

Accepted Answer

Temperature

Answer

Velocity

Answer

Acceleration

Question 24

The formula for calculating gravitational potential energy (PE) is:

Accepted Answer

PE = mgh

Answer

PE = mv^2

Answer

PE = Fd

Answer

PE = 1/2mv^2

Question 25

A lever is an example of a:

Accepted Answer

Simple machine

Answer

Power tool

Answer

Compound machine

Answer

Electrical device

Question 26

The principle of moments states that:

Accepted Answer

The clockwise moments must balance the anticlockwise moments for an object to be in equilibrium.

Answer

Force is directly proportional to acceleration.

Answer

Velocity is inversely proportional to time.

Question 27

The primary function of a gearbox is to:

Accepted Answer

Alter the speed and torque of an output shaft.

Answer

Reduce noise and vibration.

Answer

Increase the power of an engine.

Answer

Convert rotational motion into linear motion.