Part-66 Module 2 practice test

Question 1

What is a compound?

Accepted Answer

Two or more elements chemically combined

Answer

A physical mixture that can be separated easily

Answer

A substance made of only one type of atom

Question 2

What is the SI unit of force?

Accepted Answer

The newton

Answer

The kilogram

Answer

The joule

Question 3

What is the weight of a 10 kg mass on Earth?

Accepted Answer

98.1 N

Answer

10 N

Answer

0.98 N

Question 4

A force of 50 N acts at a perpendicular distance of 0.4 m from a pivot. What is the moment?

Accepted Answer

20 N·m

Answer

125 N·m

Answer

50.4 N·m

Question 5

Two forces of 30 N and 40 N act at right angles. What is their resultant?

Accepted Answer

50 N

Answer

70 N

Answer

10 N

Question 6

What does Pascal's principle state?

Accepted Answer

Pressure on a confined fluid acts equally in all directions

Answer

Pressure in a fluid depends only on its temperature

Answer

Pressure in a confined fluid acts only downwards

Question 7

A machine lifts a 500 N load with an effort of 100 N. What is its mechanical advantage?

Accepted Answer

5

Answer

0.2

Answer

400

Question 8

What is the difference between speed and velocity?

Accepted Answer

Velocity includes direction; speed does not

Answer

They mean exactly the same thing

Answer

Speed includes direction; velocity does not

Question 9

An object is dropped from rest. Ignoring air resistance, what is its speed after 3 s?

Accepted Answer

29.43 m/s

Answer

9.81 m/s

Answer

44.15 m/s

Question 10

What is the potential energy gained by a 50 kg mass raised 10 m?

Accepted Answer

4,905 J

Answer

500 J

Answer

49 J

Question 11

A force of 500 N moves a load 4 m in the direction of the force. How much work is done?

Accepted Answer

2,000 J

Answer

125 J

Answer

504 J

Question 12

Which property of a gyroscope is used in an attitude indicator?

Accepted Answer

Rigidity in space

Answer

Precession

Answer

Gimbal lock

Question 13

What is specific gravity?

Accepted Answer

Density relative to water

Answer

Density relative to air

Answer

Weight per unit volume in newtons

Question 14

Fuel has a specific gravity of 0.8. What is its density?

Accepted Answer

800 kg/m³

Answer

0.8 kg/m³

Answer

1,250 kg/m³

Question 15

In which engine cycle is heat added at constant volume?

Accepted Answer

The Otto cycle

Answer

The Brayton cycle

Answer

The isothermal cycle

Question 16

A gas occupies 2 L at 1 bar. It is compressed at constant temperature to 0.5 L. What is the new pressure?

Accepted Answer

4 bar

Answer

0.25 bar

Answer

1 bar

Question 17

What is absolute zero on the Celsius scale?

Accepted Answer

About −273 °C

Answer

0 °C

Answer

About −100 °C

Question 18

How much heat is needed to raise 2 kg of water by 10 K? (c = 4,200 J/kg·K)

Accepted Answer

84,000 J

Answer

8,400 J

Answer

840 J

Question 19

What is the approximate speed of light in a vacuum?

Accepted Answer

3 × 10⁸ m/s

Answer

340 m/s

Answer

3 × 10⁵ m/s

Question 20

What kind of wave is sound in air?

Accepted Answer

Longitudinal

Answer

Transverse

Answer

Electromagnetic