year 7 - energy

Question 1

Unit to measure energy

Answer 1

joule(J)

Question 2

Source of energy for human body

Answer 2

food

Question 3

Why do humans need energy?

Answer 3

1) to grow and repair 2) to move 3) to keep warm

Question 4

What kind of energy is stored in food, petrol and cells?

Answer 4

Chemical energy

Question 5

What are the four methods of energy transfer?

Answer 5

heating, radiation(light, sound), electricity and forces

Question 6

Which form of energy is stored in moving objects?

Answer 6

Kinetic Energy

Question 7

Energy can neither be created not be destroyed, It can only be transferred from one store to another. What is this law called as?

Answer 7

Law of Conservation of energy

Question 8

What form of energy is stored in a hot object?

Answer 8

Thermal Energy

Question 9

What is the energy stored in stretched string?

Answer 9

Strain Energy or Elastic Potential Energy

Question 10

Energy stored on an object at a height?

Answer 10

Gravitational Potential Energy

Question 11

One of the most widely used Nuclear fuel ?

Answer 11

Uranium

Question 12

The energy (chemical or nuclear) stored in fuels can be released by ———-?

Answer 12

burning

Question 13

Three examples for fossil fuels

Answer 13

Crude Oil, Natural Gas, Coal

Question 14

Petrol and diesel are made from which fossil fuel?

Answer 14

Oil

Question 15

Which fossil fuel is made from plants which dies millions of years ago?

Answer 15

Coal

Question 16

Fossil fuels are renewable resource or non renewable?

Answer 16

Non renewable (they are not replaced at the rate they are being used and will finally run out)

Question 17

A Gas, which is the main substance in Natural Gas, produced from animal and plant waste?

Answer 17

Methane

Question 18

Bio fuels (made from plants and animal waste) are renewable/ non renewable?

Answer 18

Renewable

Question 19

Solar Cells cannot work at night, why?

Answer 19

Solar cells convert nuclear energy from the sun which is transferred in the form of light and heat. Since at might solar energy isn’t available, cells wont be able to produce electricity.

Question 20

What is the source of energy for solar panel?

Answer 20

Sun/solar energy

Question 21

What is the useful transfer of energy when coal is burned?

Answer 21

Chemical Energy to ThermalEnergy

Question 22

Some energy is wasted into the surrounding when coal is burned, name one type of energy which is released and not useful.

Answer 22

sound, light

Question 23

Wind turbine generates Electricity. Wind turns the turbine blades and turbine blade turns the generator. Here___________ energy is transferred to _______ energy

Answer 23

Kinetic to Electrical

Question 24

Sugar cane is a plant. Sugar from cane is used to make alcohol which is a fuel. What is the energy source for the plant to produce sugar?

Answer 24

Sun(light)

Question 25

Why is wood a renewal energy resource?

Answer 25

wood can be grown more by planting more trees.

Question 26

When wood is burned chemical energy from the wood is transferred into _______ energy to the surroundings.

Answer 26

Thermal energy

Question 27

Name a renewable resource which is available all the time

Answer 27

hydroelectric or geothermal

Question 28

Sun is a store of ______ energy some of which is transferred by light and heat,

Answer 28

Nuclear

Question 29

An energy resource which doesn’t depend on sun

Answer 29

Nuclear fuel, tidal power and geothermal power

Question 30

Two disadvantages of fossil fuels

Answer 30

produces polluting gases (CO2) when burned.
Non-renewable