Topic-10 Energy

Question 1

Energy

Answer 1

Describes anything “that can do work”

Question 2

Law of conservation of energy

Answer 2

Energy cannot be created or destroyed. Only transferred

Question 3

Gravitational

Answer 3

Potential energy of an object elevated above the ground

Question 4

Elastic

Answer 4

Energy stored by an elastic object that is stretched, such as a spring or rubber band

Question 5

Chemical

Answer 5

Energy stored in chemicals that, when reacted together such as in burning reactions, release heat, sound or light.

Question 6

Nuclear

Answer 6

Energy stored in the nucleus of atoms that can release energy slowly, such as In a nuclear reactor, or quickly, such as in a nuclear explosion.

Question 7

Electrical

Answer 7

Energy supplied to homes by powerlines and available to your appliances via power outlets in the home.

Question 8

Kinetic

Answer 8

Energy possessed by objects that are moving

Question 9

Heat

Answer 9

Energy that causes objects to gain temperature

Question 10

Light

Answer 10

Energy that may be released, for example, when an object is hot or by a nuclear reaction in a star.

Question 11

Sound

Answer 11

Energy carried by the air in a room and detected by the ear.

Question 12

Efficiency

Answer 12

The fraction of energy supplied to a device as useful energy it is usually expressed as a percentage.

Question 13

Conduction

Answer 13

Transfer of heat through collision between particals

Question 14

Insulator

Answer 14

A material that is a poor conductor heat

Question 15

Convection

Answer 15

Transfer of heat through the flow of particles

Question 16

Radiation

Answer 16

A method of heat transfer that does not require particles to transfer heat from one to another

Question 17

Radiant heat

Answer 17

Heat transferred br radiation, as from the sun to the earth

Question 18

Reflected

Answer 18

Bounced off

Question 19

Transmitted

Answer 19

Passed through something, such as light or sound passing through air

Question 20

Deciduous

Answer 20

Describes plants that lose their leaves during autumn and winter

Question 21

Luminous

Answer 21

Releasing its own light

Question 22

Incandescent

Answer 22

Describes objects that emit light when they are hot

Question 23

Bioluminescent

Answer 23

Describes living things that release light energy

Question 24

Non-luminous

Answer 24

Describes objects that do not emit their own light, but can be seen by reflected light

Question 25

Scattered

Answer 25

Describes light sent in many directions by small particles within a substance

Question 26

Visible spectrum

Answer 26

Different colours that combine to make up white light; they are separated in rainbows

Question 27

Dispersion

Answer 27

Separation of the colours that make up white light. Each colour is bent differently when it enters or leaves a glass prism.

Question 28

Electromagnetic radiation

Answer 28

The radiant energy such as radio waves, infrared, visible light, x-rays and gamma rays released by magnetic or electric fields

Question 29

Electromagnetic spectrum

Answer 29

Complete range of wavelengths radiated as electric and magnetic fields

Question 30

Radio waves

Answer 30

Low energy electromagnetic waves with a much lower frequency and longer wavelength than visible light

Question 31

Infra-red radiation

Answer 31

Invisible radiation emitted by all warm objects. You feel infra-red radiation as heat

Question 32

Ultraviolet radiation

Answer 32

Invisible radiation similar to light but with a slightly higher frequency and more energy

Question 33

X-ray

Answer 33

an electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials non transparent to light

Question 34

Gamma rays

Answer 34

High energy electromagnetic radiation produced during nuclear reactions

Question 35

Rays

Answer 35

Narrow beams of light

Question 36

Convex

Answer 36

Refers to a lens that is curved outwards

Question 37

Focal point

Answer 37

The point where light rays ‘close in’ (converge towards a point