Energy 2

Question 1

The energy required to make a car move along a flat road, to launch a rocket into outer space and to
operate a small calculator is transformed from

Answer 1

Chemical energy

Question 2

The faster an object moves

Answer 2

More kinetic energy it has

Question 3

A group of sheep are grazing in a field. As they eat, the sheep break down the molecules in the
grass, which releases energy. Which form of energy is stored in the grass?

Answer 3

Chemical potential energy

Question 4

Four different brands of batteries each stores 5.5 kJ of energy. The table below shows how much
electrical energy each battery releases.
Brand A B C D
Electrical energy released (kJ) 4.25 4.32 4.19 4.07

Answer 4

Brand B

Question 5

A particular electric knife is 40% efficient. If 100 J of energy is supplied to the knife, the number of
joules that is then transformed into kinetic energy is

Answer 5

40

Question 6

When a hand held fan turns, the blades spin. Which diagram shows the energy conversion to make the
fan work?

Answer 6

Chemical electrical kinetic

Question 7

Heated air rises, cools, and then sinks. Air near a heater is
replaced by cooler air, and the cycle repeats. This is an example of

Answer 7

Convection

Question 8

An object in which thermal energy moves easily is called

Answer 8

A conductor

Question 9

The transfer of heat by the passing of vibrations from particle to particle in a substance is called

Answer 9

Conduction

Question 10

The law of reflection states that the angle of incidence equals

Answer 10

The angle of reflection

Question 11

Which statement about light is false?

A. If light did not travel in straight lines there would be no shadows. B. Light can be made to travel around corners using mirrors. C. You can only see this page because light reflects off the page into your eyes. D. No letter of the alphabet looks the same when viewed in a mirror.

Answer 11

D

Question 12

A metal pole attached to a net used to clean a pool looks bent when it is standing up inside a pool. The
process that explains why this happens is called

Answer 12

Refraction

Question 13

. The figure below shows the path of a ray of light when travelling from air to glass. Which is the angle
of incidence?

Answer 13

Angle A

Question 14

What happens to the speed of light when it travels into glass or Perspex from the air?

Answer 14

It slows down

Question 15

The action of the lens in obtaining a sharp image on the retina is called

Answer 15

Accommodation

Question 16

What is the function of the optic nerve in the eye?

Answer 16

A. It sends electrical messages to your brain.

Question 17

In a normal human eye, the image is formed

Answer 17

On the retina

Question 18

In the eye disorder known as long-sightedness, the image of an object forms behind the retina. Long-
sightedness is corrected by bringing the image forward using

Answer 18

convex lenses that bend the light more.

Question 19

A ray of light passes through a window. Which path

does it take?

Answer 19

C

Question 20

A parallel beam of light falls on a converging lens.

Which diagram shows what happens to the beam of light?

Answer 20

D

Question 21

chemical energy into kinetic energy

Answer 21

Car

Question 22

elastic potential energy into kinetic energy.

Answer 22

Catapult

Question 23

When particles very close together, such as in a solid, vibrate the
heat is moved from particle to particle.

Answer 23

Conduction

Question 24

Heat causes the particles to gain energy and spread apart, as in a liquid.

Answer 24

Convection

Question 25

Parts of the eyes

Answer 25

Retina, pupils, iris,cornea, lens, optic nerve

Question 26

Bends the incoming light, so that it passes through the pupil towards the lens.

Answer 26

Cornea

Question 27

B. The image forms here. The light-sensitive cells detect the brightness and colour of the different
parts of the image.

Answer 27

Retina

Question 28

C. The opening through which light travels towards the lens.

Answer 28

Pupil

Question 29

Identify which lens (A or B) will be suitable to correct hyperopia (long-sightedness). _________
(b) Where will the image form if this corrective lens is not used?

Answer 29

B

Behind the retina

Question 30

The diagram shows three parallel light rays
passing beneath a tile. Beneath the tile is a lens.

What is the shape of the lens?

Does this lens have a real or virtual focal point?

Answer 30

Concave

Virtual