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Yr 8 KS 3 Physics revision

Total questions: 100

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
How does light behave as it enters these mediums?
a)
continue its path as straight line.
b)
bends toward the normal
c)
bends away from the normal
d)
reflects
2.
What is this called?
a)
refraction
b)
reflection
c)
reconstroction
d)
retraction
3.

When light passes at an angle to the normal from one medium into another in which its speed is higher

a)

it is bent toward the normal.

b)

it always lies along the normal.

c)

it is unaffected.

d)

it is bent away from the normal.

4.

If all other variables are held constant, what happens to the angle of refraction if the angle of incidence increases?

a)

the angle of refraction stays the same

b)

the angle of refraction decreases

c)

the angle of refraction increases

d)

cannot be determined from the information provided

5.

A student placed a pencil in a cup of water. The pencil appears broken because light

a)

always travels in a straight line.

b)

bends when it passes through water.

c)

makes the water in the glass evaporate.

d)

reflects the pencil on the water's surface.

6.

Based on the image, as light passes from medium 1 to medium 2

a)

light speeds up and bends towards the normal

b)

light speeds up and bends away from the normal

c)

light slows down and bends towards the normal

d)

light slows down and bends away from the normal

7.
In what medium does light travel the fastest?
a)
vacuum
b)
air
c)
water
d)
glass
8.

During reflection off a smooth surface, the angle of incidence is

equivalent to the angle of reflection.

a)

True

b)

False

9.

The normal is an imaginary line that is perpendicular to the mirror.

a)

True

b)

False

10.

The incident ray, reflected ray and the normal all lie on the

same plane

a)

True

b)

False

11.

An image in the mirror is laterally inverted as compared to the actual object.

a)

True

b)

False

12.

The image formed is virtual.

a)

True

b)

False

13.

The distance between the image and the mirror is the same as

the distance between the actual object and the mirror.

a)

True

b)

False

14.

The image formed is smaller than the actual object

a)

True

b)

False

15.

Light is reflected and refracted by water.

The diagram shows some paths a ray of light may take.

Which letter shows the reflected ray?



(a)  

16.

The law of reflection is about the angle of incidence (i) and the angle of reflection (r).

Write down the law of reflection.

4 lines
17.

What is the angle of incidence of a light ray reflected off a plane mirror at an angle of 35° to the normal?

a)

35

b)

70

c)

90

18.

(The angle that a reflected ray makes as measured from the normal to a reflective surface equals the angle that the incident ray makes as measured from the same normal.) This is a ...

a)

law of reflection

b)

specular reflection

c)

diffuse reflection

19.

Match the following definitions

a)

Pinna

1.

outer part of the ear; direct sound down the auditory canal

b)

Eardrum

2.

membrane that transmits sound vibrations from the outer ear to the middle ear

c)

Cochlea

3.

snail-tube in the inner ear; produce electrical signal

d)

Ossicles

4.

small bones in the inner ear, amplify the sound

e)

Oval window

5.

membrane connecting ossicles to cochlea, transfers the vibration to the liquid in the cochlea

20.

Which of these are sounds that human can hear ?

a)

1000 Hz

b)

2000 Hz

c)

25,000 Hz

d)

100,000 Hz

e)

Footsteps

21.

What type of sound is used for medical imaging or to measure water depth ?

(a)  

22.

Pitch is how _____ and ______ sound is.

a)

loud and soft

b)

rough and bumpy

c)

high and low

d)

high and loud

23.

A mouse's squeak has a ______ pitch.

a)

low

b)

squeaky

c)

high

d)

loud

24.

Which wave has a higher frequency per second?

a)

blue wave

b)

red wave

25.

If a sound wave has a high pitch, it has a ___.

a)

high frequency

b)

low frequency

26.

The number of wavelengths that pass by a point each second is called ...

a)

wavelength

b)

pitch

c)

frequency

27.

Hertz is the unit for ...

a)

loudness

b)

amplitude

c)

speed of a wave

d)

frequency

28.

The high pitch sound is

a)
b)
c)
29.
What is frequency?
a)
the number of vibrations per second
b)
how high or low a sound is
c)
the loudness or softness of a sound
d)
the back and forth movement of matter
30.

The loudest sound is

a)
b)
31.

What do you call the distance between two crests of a wave?

a)

Hit Points

b)

hertz

c)

Wavelength

d)

Wave Duration

32.

How is sound created?

a)

Through light

b)

Through pitch

c)

Through vibrations

d)

Through frequencies

33.

The picture shows 4 sound waves on an oscilloscope. What can you say about A?

a)

It is a very low pitched sound

b)

It is a very high pitched sound

c)

It is a very quiet sound

d)

It is a very loud sound

34.

The picture shows 4 sound waves on an oscilloscope. Which 2 have the smallest amplitude?

a)

A

b)

B

c)

C

d)

D

35.

What is the height of a wave called?

a)

Peak

b)

Wavelength

c)

Amplitude

d)

Frequency

36.

Sound will travel fastest through which of the following forms of matter?

a)

Solid

b)

Liquid

c)

Gas

d)

Jelly

37.

Why can you not hear sounds in space?

a)

Space is loud

b)

Waves can't travel in space

c)

There are no particles to vibrate

38.

What type of wave is this?

a)

Longitudinal

b)

Transverse

39.

This change of direction by a

mirror is called

a)

Reflection of power

b)

Reflection of shadow

c)

Reflection of light

d)

Reflection of virtual image

40.

The image

formed by a plane mirror could not be

obtained on a screen is called _________

a)

Erect image

b)

Virtual image

c)

Magnified image

41.

Which are the primary colours in visible light?

a)

Red, Green, Blue

b)

Red, Orange, Yellow

42.

What is the specialized cell in your retina called?

a)

Retina Cells

b)

Red Blood

c)

Cones

d)

Image Cells

43.

Where does the cone send the signal to?

a)

Eyes

b)

Brain

44.

The colour you see is the colour that is ………………..

a)

Reflected

b)

Absorbed

45.

Which colour/s is absorbed when green grass is placed under a yellow light?

(Red + Green = Yellow)

a)

Green

b)

Red

46.
Why does an apple appear red?
a)

Red is absorbed & the others are reflected

b)

All colors are absorbed except for blue, which is reflected

c)

All colors are reflected and none are absorbed

d)

All colors are absorbed except for red, which is reflected

47.
Objects that reflect ALL colors will appear _____?
a)
Black
b)
White
c)
Gray
d)
Multi-colored
48.
Objects that ABSORB all colors of light will appear _______.
a)
white
b)
black
c)
multi-colored
d)
gray
49.

What happens in lateral inversion ?

a)

The right side of the object will be on the right side of the image.

b)

The left side of the object will be on the left side of the image.

c)

The top of the object will be the bottom of the object.

d)

The right side of the object will be on the left side of the image.

50.

The breaking up of white light into its component .

Based on the statement given, name the process that takes place in the white light.

a)

Dispersion

b)

Reflection

c)

Refraction

d)

Scattering

51.

Why is red light is at the top whileviolet at the bottom of the spectrum?

a)

Violet light has the medium speed so it is refracted the least.

b)

Violet light has the highest speed so it is refracted the least

c)

Red light has the slowest speed so it is refracted the least

d)

Red light has the highest speed so it is refracted the least.

52.

A transparent object that bends light into rainbow colors.

a)

prism

b)

mirror

c)

convex lens

d)

concave lens

53.

The substance in the sky which is involved in the formation of rainbow

a)

Air particle

b)

Dust

c)

Raindrop

d)

soot

54.

Which of the following is NOT a source of light?

a)

eyes

b)

lit candle

c)

sun

d)

firefly

55.

Light is able to pass through __________________ materials

a)

transparent

b)

shiny

c)

dull

d)

opaque

56.

Light is unable to pass through ________________ objects

a)

opaque

b)

coloured

c)

blunt

d)

dark

57.

Select all that are TRUE about Absorption & Transmission.

a)

Absorption occurs when light transfers into a substance as heat

b)

Absorption occurs when light passes through a substance

c)

Transmission occurs when light passes through a substance

d)

Transmission occurs when light transfers into a substance as heat

58.

Reorder the following from most to least Transmission.

a)
b)
c)
d)
1)
2)
3)
4)
59.

red+green+blue

a)

cream white

b)

semi white

c)

dull white

d)

white

60.

blue+red=

a)

dull red

b)

indigo

c)

magenta

d)

blood-red

61.
A ray of light passes through a window. Which path does it take? 
a)
A
b)
B
c)
C
d)
D
62.
A ray of light is reflected by two parallel plane mirrors X and Y.  Which statement is correct? 
a)
The angle of incidence at mirror X is 30°.
b)
The angle of incidence at mirror Y is 60°.
c)
The angle of reflection at mirror X is 120°.
d)
The angle of reflection at mirror Y is 0°. 
63.
A student shines a narrow beam of white light into a prism as shown in the diagram. He sees a spectrum of colours emerging from the prism.  Which three colours does he see at X, at Y and at Z? 
a)
X: blue, Y:yellow, Z:red
b)
X: red, Y:blue, Z:yellow
c)
X: red, Y:yellow, Z:blue
d)
X: yellow, Y:red, Z:blue
64.

Which images are opaque?

a)

A & C

b)

A,C,E, & F

c)

D, E, & F

d)

A & E

65.

What color is produced when mixing cyan, yellow, and magenta inks (pigments).

a)

White

b)

Black

c)

Blue

d)

Green

66.

In this graph, a bus is:

a)

moving

b)

standing still (stationary)

c)

speeding up (accelerating)

d)

slowing down (decelerating)

67.

The speed of a bus in this graph is:

a)

fast

b)

slow

c)

zero

d)

the speed of light

68.

This line shows that:

a)

the bus is at a bus stop

b)

the bus is gradually slowing down (decelerating)

c)

the bus moves in a steady speed

d)

the bus is gradually speeding up (accelerating)

69.

In this graph,

a)

the bus is gradually speeding up (accelerating).

b)

the line is curved.

c)

the bus is gradually slowing down (decelerating).

d)

none of the above.

70.

Choose the correct relationship between speed, time and distance

a)

speed = timedistan⁡cespeed\ =\ \frac{time}{dis\tan ce}  

b)

time=speeddistan⁡cetime=\frac{speed}{dis\tan ce}  

c)

distan⁡ce=speedtimedis\tan ce=\frac{speed}{time}  

d)

time=distan⁡cespeedtime=\frac{dis\tan ce}{speed}  

71.

Usain Bolt ran the 100 m sprint in 9.63 s in August 2012. How do we work out his average speed over the race?

a)

av. speed=100×9.63av.\ speed=100\times9.63  

b)

av. speed=1009.63av.\ speed=\frac{100}{9.63}  

c)

av. speed = 9.63×100av.\ speed\ =\ 9.63\times100  

d)

av. speed=9.63100av.\ speed=\frac{9.63}{100}  

72.

What was Usain Bolt's average speed over the race?

100 m sprint in 9.63 s

a)

10.4 m/s

b)

0.96 km/hr

c)

10.4 km/hr

d)

0.96 m/s

73.

This is a distance-time graph of Usain Bolt's sprint.

Choose the best description of his speed over the race.

a)

He maintained a speed of 10.4 m/s throughout the race

b)

He accelerated, then decelerated.

c)

He started at a steady speed and slowed as he got tired.

d)

He sped up, then maintained a steady speed.

74.

How far had he ran before reaching his maximum speed?

a)

10 m

b)

30 m

c)

70 m

d)

90 m

75.

Valentina is going for a bike ride.

The distance-time graph describes her full journey.

How long was she stationary for?

a)

5 minutes

b)

7.5 minutes

c)

10 minutes

d)

15 minutes

76.

What was the total distance travelled during her journey?

a)

0 km

b)

25 km

c)

50 km

d)

75 km

77.

Why would 2 magnets repel each other

a)

They have opposite poles

b)

They have like poles

c)

The other magnet has less iron

d)

None of the above

78.

What causes Magnetism

a)

Protons bouncing around

b)

Friction

c)

Moving electrons

d)

None of the above

79.

which of the following is a non - magnetic substance ?

a)

Iron

b)

nickel

c)

cobalt

d)

copper

80.

the region around a magnet where its magnetic force can be experienced is called its

a)

magnetic axis

b)

magnetic equator

c)

magnetic field

d)

magnetic poles

81.

permanent magnets can be demagnetized by

a)

hammering

b)

heating

c)

rough handling

d)

all of these

82.

Magnetite is also called as

a)

Lodestone

b)

Pyrrhotite

c)

Coulumbite

d)

Ferrite

83.
What is most likely to happen when the switch is closed?
a)
A magnetic field should be produced
b)
The nail will rust
c)
The battery will explode
d)
The wire will catch on fire
84.
How do electromagnets differ from regular magnets? 
a)
A. They  can be turned off and on 
b)
B. Their polarity can be reversed
c)
C. Their strength can be changed
d)
D. All of the above
85.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
86.

Magnets on refrigerator cannot be turned off. Which type of magnets they belong?

a)

electromagnets

b)

battery

c)

permanent magnets

d)

copper wire

87.

What are the components of the electromagnets?

a)

battery, wire and bulb

b)

battery , copper wire and plastic bottle

c)

battery, copper wire and iron nail

d)

battery, wire and aluminum

88.

Energy due to motion

a)

kinetic (KE)

b)

gravitational (GE)

c)

elastic (EE)

d)

thermal (TE)

89.

The S.I unit of speed is

a)

meter per second

b)

kilometer per second

c)

both

90.

What are the units for acceleration?

a)

m/s2

b)

m

c)

sec

d)

s/m

91.

Match the following graphs to the right description.

a)
1.

Speeding up

b)
2.

No acceleration (constant speed)

c)
3.

Slowing down

92.

What is the acceleration in the first ten seconds?

(15m/s - 0m/s) / 10s =

a)

4 m/s2

b)

1.5 m/s2

c)

10 m/s2

d)

0 m/s2

93.
A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?
a)
24 m/s2
b)
18 m/s2
c)
16 m/s2
d)
16 m/s
94.

A box at rest starts sliding down an inclined plane for 3 seconds, until it reaches a velocity of 27 m/s. What is the boxes acceleration?

a)

30 m/s

b)

24 m/s2

c)

9 m/s2

d)

81 km/hr

95.

A running horse increases his speed from 15 m/s to 42 m/s at an acceleration of 9 m/s2. How long did this take the horse?

a)

5 s

b)

4 s

c)

6 s

d)

3 s

96.

Using the graph, which person finished the race first?

a)

Biker

b)

Runner

c)

Walker

d)

All of these finished at the same time.

97.

Alan travels 100 km in 5hrs. Find his speed in km/h

a)

5km/hr

b)

10km/hr

c)

50km/hr

d)

20km/hr

98.

A worm traveled 50 centimeters in 5 minutes. What is the average speed of the snail?

a)

10 cm/m

b)

25 cm/m

c)

250 cm/m

d)

1 cm/m

99.

What is the speed of an object that travels 60 meters in 4 seconds?

a)

240 m/s

b)

15 m/s

c)

0.067 m/s

d)

15 mph

100.

Xavier runs during gym class. He runs 100 meters in 10 seconds. What is his speed in meters per second?

a)

15 m/s

b)

10 m/s

c)

5 m/s

d)

12 m/s

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