Question 1

What are the 6 essential base SI units?

Accepted Answer

kg, m, s, A, mol, K

Answer

g, m, s, A, mol, K

Answer

kg, m, s, A, mol, T

Answer

kg, m, s, B, mol, K

Question 2

Which equation can be used to calculate density?

Accepted Answer

p = m / V

Answer

p = m - V

Answer

p = m * V

Answer

p = m + V

Question 3

What is the principle of moments?

Accepted Answer

The total clockwise moment equals the total anticlockwise moment.

Answer

Moments are independent of the forces acting.

Answer

The total clockwise moment is greater than the total anticlockwise moment.

Answer

The total anticlockwise moment is always zero.

Question 4

How is a body in equilibrium defined?

Accepted Answer

When the resultant force and the net moment are zero.

Answer

When the resultant force is zero and the net moment is non-zero.

Answer

When the net moment is zero only.

Answer

When forces act at angles only.

Question 5

What are scalars?

Accepted Answer

Quantities with only magnitude.

Answer

Quantities that depend on time.

Answer

Quantities that can be represented by numbers only.

Answer

Quantities with both magnitude and direction.

Question 6

What is the difference between speed and velocity?

Accepted Answer

Speed is a scalar; velocity is a vector.

Answer

Speed considers direction; velocity does not.

Answer

Speed can be negative; velocity cannot.

Answer

Speed is a vector; velocity is a scalar.

Question 7

What does it mean for an equation to be homogeneous?

Accepted Answer

Both sides of the equation have identical base SI units.

Answer

Only the left side has units.

Answer

Both sides of the equation have different units.

Answer

The equation is equal to zero.

Question 8

What does the equation F = ma represent?

Accepted Answer

Force equals mass times acceleration.

Answer

Mass equals force times acceleration.

Answer

Force equals mass divided by acceleration.

Answer

Force is independent of mass and acceleration.

Question 9

What is the formula to resolve a vector into its perpendicular components?

Accepted Answer

F_x = F cos(θ) and F_y = F sin(θ)

Answer

F_x = F/T and F_y = F/T

Answer

F_x = F sin(θ) and F_y = F cos(θ)

Answer

F_x = F + θ and F_y = F - θ

Question 10

What is density defined as?

Accepted Answer

Mass per unit volume.

Answer

Mass multiplied by volume.

Answer

Mass minus volume.

Answer

Volume divided by mass.

Question 11

Which of the following is an example of a vector quantity?

Accepted Answer

Velocity

Answer

Volume

Answer

Speed

Answer

Mass

Question 12

What is the principle of moments?

Accepted Answer

If an object is in equilibrium, the total clockwise moments equal the total anticlockwise moments.

Answer

Forces must always be equal to maintain balance

Answer

Moments can be ignored if weights are equal

Answer

Only the resultant force is considered in equilibrium

Question 13

How is force defined in terms of mass and acceleration?

Accepted Answer

F = ma

Answer

F = m + a

Answer

F = m / a

Answer

F = ma^2

Question 14

What does it mean for an equation to be homogeneous regarding units?

Accepted Answer

Both sides of the equation must have identical base SI units.

Answer

The equation must include only one type of unit

Answer

The equation must contain only scalar quantities

Answer

The equation has to balance in terms of numbers

Question 15

In the context of equilibrium, what does it mean when the resultant force is zero?

Accepted Answer

The object is not accelerating and is either at rest or moving with constant velocity.

Answer

The object is always at rest

Answer

The forces acting on the object are equal and opposite

Answer

The object will eventually move faster

Question 16

When resolving a vector into two perpendicular components, which trigonometric functions are typically used?

Accepted Answer

Sine and cosine

Answer

Secant and cosecant

Answer

Tangent and cotangent

Answer

Only square roots

Question 17

What is the unit of energy in the SI system?

Accepted Answer

Joule

Answer

Pascal

Answer

Watt

Answer

Newton

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