Ch 5 + Chapter 6: Work and Energy

1

Rachel is studying work. She knows that work is done when a force moves an object in the direction of the force. If the force and displacement are perpendicular to each other, what is the work done?

A Zero B Maximum C Minimum D Equal to the force

2

Nadia is studying Pascal's principle. She learns that Pascal's principle applies to fluids. What is a fluid?

A Only liquids B Only gases C Liquids and gases D Solids and liquids

3

George is studying energy conversion. He drops a ball from a height of 5 meters. As the ball falls, its potential energy is converted to kinetic energy. What is the kinetic energy of the ball just before it hits the ground? (Assume mass = 1 kg, g = 10 m/s²)

A 50 Joules B 5 Joules C 10 Joules D 0 Joules

4

Which of the following is a form of energy?

A Force B Mass C Heat D Distance

5

Pressure increases when:

A Force decreases B Area increases C Area decreases D Mass decreases

6

Bilal is holding a heavy book stationary at a height of 1 meter above the ground. He is exerting an upward force, but the book does not move. How much work is Bilal doing on the book?

A Work equal to the weight of the book B Zero work C Work equal to the height D Work equal to the mass times the height

7

Yusuf is studying energy resources. He knows that nuclear energy is a non-renewable resource. What is the source of nuclear energy?

A Fusion of hydrogen atoms B Combustion of fossil fuels C Splitting of uranium atoms D Motion of water

8

Chloe is studying the conversion of energy in a hydroelectric dam. The potential energy of water is converted to kinetic energy, which then turns turbines. What is the final form of energy?

A Chemical energy B Electrical energy C Nuclear energy D Thermal energy

9

Beyond elastic limit, a material:

A Returns to original shape B Shows permanent deformation C Becomes rigid D Stops stretching

10

Quinn is studying tides. He knows that tidal energy is generated by the movement of water due to tides. What causes tides?

A Wind B Gravitational pull of the Sun and Moon C Earth's rotation D Volcanic activity

11

Julia is studying wave energy. She knows that wave energy is generated by the movement of waves. What type of energy is wave energy?

A Mechanical energy B Electrical energy C Chemical energy D Nuclear energy

12

Bongani is studying the hydraulic car brake system. He learns that the brake fluid transmits pressure from the brake pedal to the brake pads. Why is brake fluid used?

A Because it is compressible B Because it is incompressible C Because it is a good conductor of electricity D Because it is a good insulator

13

Standard atmospheric pressure is equal to:

A 76 cm of mercury B 10 cm of mercury C 1 cm of mercury D 760 cm of mercury

14

Rania is studying Hooke's Law. She learns that Hooke's Law is expressed as F = kx. In this equation, what does 'x' represent?

A Force applied B Spring constant C Extension or compression D Mass

15

According to conservation of energy, total energy remains:

A Increasing B Decreasing C Constant D Zero

16

What is meant by work done in physics?

A Force applied without movement B Movement without force C Force causing displacement D Energy stored in an object

17

Omar is learning about the hydraulic lift. He understands that the hydraulic lift works by transmitting pressure through a fluid. What is the fluid used in most hydraulic lifts?

A Water B Oil C Mercury D Alcohol

18

Which unit is used for energy?

A Newton B Watt C Joule D Volt

19

If more work is done in less time, power will be:

A Less B Zero C More D Negative

20

Yara is learning about applications of the manometer. She understands that a manometer can be used to measure blood pressure. What instrument is used to measure blood pressure?

A Thermometer B Sphygmomanometer C Barometer D Hydrometer

21

Power is defined as:

A Work done per unit time B Energy stored C Force applied D Distance covered

22

What is the spring constant?

A Force per unit mass B Extension per unit force C Force per unit extension D Area per unit force

23

Paula is studying the hydraulic car brake system. She learns that the brake system uses a master cylinder and wheel cylinders. When the brake pedal is pushed, the master cylinder:

A Increases pressure in the brake lines B Decreases pressure in the brake lines C Maintains constant pressure D Stops the flow of brake fluid

24

Patricia is studying waves in the sea. She knows that wave energy can be harnessed to generate electricity. What type of energy is wave energy?

A Renewable energy B Non-renewable energy C Fossil fuel energy D Nuclear energy

25

Waleed is learning about applications of atmospheric pressure. He understands that atmospheric pressure is used in pneumatic systems. Which of the following is a pneumatic system?

A Hydraulic lift B Brake system in cars C Tire inflation D Electric motor