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SCIENCE QUIZ 2

Total questions: 191

Worksheet time: 2hrs 7mins

Name
Class
Date
1.
Which organelle is only found in a plant cell? 
a)
nucleus
b)
chloroplast
c)
mitochondria
d)
cell membrane
2.

The rougher the surface, the faster an object will travel over the surface.

a)

True

b)

False

3.
Which of the following is an example of friction that is harmful?
a)
Pencil marking on paper
b)
Engine parts wearing out
c)
sand placed on ice in the winter
d)
Using an eraser to erase marks
4.

Why are the soles of shoes and tyres of vehicles grooved?

a)

To increase friction

b)

To reduce friction

5.

Why do gymnasts apply a coarse substance to their hands?

4 lines
6.
Which would NOT be a way of reducing friction?
a)
making the surfaces smoother
b)
using lubricants such as waxes, oils, or grease
c)
changing from sliding friction to rolling friction using ball bearings
d)
Using kitty litter on snow and ice to help your car gain traction
7.

A rolling ball comes to a stop without any visible force stopping it. What is this invisible force stopping the ball from rolling indefinitely?

a)

Friction

b)

Fiction

c)

Gravitational force

d)

Weight

8.

Friction is a force that opposes (a)   motion between two bodies in contact.

9.

Frictional force acts in the (a)   direction to the force applied.

10.

Frictional force acts ________ to the surface.

a)

perpendicular

b)

parallel

11.

Frictional force depends upon:

a)

A) Nature of both surfaces: Rough/smooth.

b)

B) Force with which two surfaces are pressed together.

c)

C) Area of surfaces in contact

d)

D) All the above

12.

Frictional force may arise due to:

a)

A ) the roughness of surfaces

b)

B) attraction between molecules of the two sliding surfaces.

c)

Both A and B

13.
a)

RIGHT

b)

LEFT

14.

a)

towards right

b)

towards left

15.

What are the four types of friction?

a)

Pulling, Pushing, Rolling, and Sliding

b)

Fluid, Sliding, Rolling and Static

c)

Fluid, Pushing, Pulling, and Rolling

d)

Pulling, Pushing, Static, and Sliding

16.

Will these magnets repel or attract?

a)

Repel

b)

Attract

17.

Will these magnets repel or attract?

a)

Repel

b)

Attract

18.

Will these magnets repel or attract?

a)

Repel

b)

Attract

19.

Give another example of Static Electricity.

4 lines
20.

Which picture is an example of conduction?

a)
b)
c)
21.

What is the unit for force?

a)

Pound

b)

Newton

c)

Gram

d)

Liter

22.

A force is a (a)   on an object

23.

What do forces do when they act in the same direction?

a)

shift to a different direction

b)

cancel

c)

combine

d)

none of the above

24.

When two teams pull at a rope during tug-of-war and no one is moving what type of force is occurring?

a)

balanced

b)

unbalanced

c)

friction

d)

gravity

25.

What affects friction? Choose all that apply

a)

The weight of the object

b)

The surface area of the two objects touching

c)

The temperature of the object

d)

How many objects are being used

e)

The type of surface that the object is placed onto.

26.

A big brown bat flies around the middle school looking for a meal to feast on, which type of friction is occurring as the bat is flying?

a)

sliding friction

b)

fluid friction

c)

static friction

d)

rolling friction

27.

You are attempting to push a tapir from your path in the Brazilian rainforest but the tapir does not budge. What type of friction keeps the tapir in place?

a)

sliding

b)

fluid

c)

rolling

d)

static

28.

A macaroni penguin glides through the water under your feet at the Indianapolis zoo. Which type of friction is acting on the penguin?

a)

static

b)

rolling

c)

fluid

d)

sliding

29.

Look back in your notes to help with this question! What are two factors that affect gravity?

(a)  

30.

Which would create more friction?

a)

carpet

b)

metal

31.
Rougher surfaces have ...
a)
greater friction
b)
less friction
c)
the same level of friction
32.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
33.
The rougher the surface, the faster an object will travel over the surface.
a)
True
b)
False
34.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
35.

Which of these materials do you predict would have the MOST amount of friction

a)

Metal

b)

Tile

c)

Sand Paper

d)

Denim

36.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
37.

Which of these best describes friction?

a)

A rubbing force.

b)

Something that is slippery.

c)

Gravity.

d)

Movement across a smooth surface.

38.

Which motion has less friction

a)

Sliding on grass

b)

Sliding on ice

39.

If you poured oil onto a wooden surface, the friction would ..

a)

be decreased

b)

be increased

c)

remain the same

40.
If these teams are pulling with the same amount of force what will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
41.

A ____________ is a push or a pull on an object.

a)

friction

b)

force

c)

magnet

d)

gravity

42.
What is the net force?
a)
20 N 
b)
0 N 
c)
400 N 
d)
40 N 
43.

What is the net force?

a)

3 N

b)

3 N, right

c)

17 N, right

d)

3 N, left

44.
Rougher surfaces have ...
a)
greater friction
b)
less friction
c)
the same level of friction
45.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
46.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
47.
When most objects with smooth surfaces rub, there is less friction.
a)
True
b)
False
48.
The rougher the surface, the faster an object will travel over the surface.
a)
True
b)
False
49.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
50.

TRUE or FALSE if you push a box across a surface like rough wood with a lot friction, it will NEVER stop

a)

TRUE, as long as it doesn't run into something it will keep going and going and going

b)

FALSE, it will stop very quickly

51.

Friction _____________ motion

a)

Works in the same direction as

b)

Opposes

c)

Has not effect on

d)

Pulls against

52.

Materials which allow electric current to pass through them are ______________

a)

conductors

b)

insulators

53.

The path through which the electric current flows is _____________

a)

current

b)

circuit

54.

The flow of electrons in a wire is called as_____________

a)

circuit

b)

current

55.

(a)   are good conductors of electricity.

56.

Give two examples of insulators

4 lines
57.

Which one of the following solutions will not conduct electricity?

(a) lemon juice

(b) vinegar

(c) tap water

(d) vegetable oil

a)

a

b)

b

c)

c

d)

d

58.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

59.

Conduction of electricity in liquids occurs through electrons.

a)

True

b)

False

60.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

61.

The electrode thats connected to the positive terminal of the battery is called a

a)

anode

b)

cathode

c)

elctrode

62.

When electricity is passed through tap water, the gases __________ and __________ are evolved.

(a)  

63.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
64.

An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

65.

When an electric current is passed through a conducting solution, there is a change in the colour of the solution. This indicates:

(a) the chemical effect of current.

(b) the heating effect of current.

(c) the magnetic effect of current.

(d) the lightning effect of current.

a)

a

b)

b

c)

c

d)

d

66.

Name the effect of current responsible for the glow of bulb in an electric circuit.

a)

magnetic effect of current

b)

chemical effect of current

c)

heating effect of current

67.

the phenomenon of decomposition of an electrolyte when electricity is passed through is known as

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

68.

In an LED, the longer lead is attached to the (a)   terminal of the battery and the shorter lead to the negative terminal.

69.

Electroplating is a process whereby a metal surface is coated with a non-metal.

a)

True

b)

False

70.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

71.

Which is not a reason for metal plating?

a)

decorative purposes

b)

prevent rust and corrosion

c)

to make the metal stronger

72.

The electrode that contains the plating metal

a)

Anode

b)

Cathode

73.

The electrode that contains the item to be electroplated

a)

Anode

b)

Cathode

74.

Chromium corrodes easily.

a)

True

b)

False

75.

Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

a)

Gold

b)

Chromium

c)

Zinc

d)

Tin

76.

Which of these is plated on the iron to prevent it from chemically reacting with food?

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

77.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the nearby pond.

c)

in the nearby cornfield.

d)

according to the disposal guidelines of the local authority.

78.

The method of coating metals by immersing the metals in a liquid and then passing an electric current through the liquid is called ________

a)

Electrolysis

b)

Electroplating

c)

Electropalting

d)

Electroplation

79.

Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?

a)

to increase acidity

b)

to increase conductivity

c)

So that the colour becomes more prominent

d)

to burn copper sulphate

80.

Which of the following is not used for electroplating metal articles?

a)

Nickel

b)

Silver

c)

Chromium

d)

Sodium

81.

If the fork is to be electroplated with silver metal, what electrolyte should be used?

a)

Molten calcium chloride

b)

Aqueous silver nitrate

c)

Sodium chloride solution

d)

Copper(II) sulphate solution

82.

The conductors among the following are

a)

Hydrochloric acid

b)

Sugar solution

c)

Vinegar

d)

Salt water

83.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
84.

Copper will form at which electrode

a)

Positive

b)

Negative

c)

Neutral

d)

Neither

85.

Which of the following does not conduct electricity?

a)

Sugar solution

b)

Vinegar solution

c)

Lemon juice solution

d)

Caustic soda solution

86.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

87.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

88.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

89.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

90.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

91.

Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

a)

Gold

b)

Chromium

c)

Zinc

d)

Tin

92.

Boojho’s uncle has set up an electroplating factory near his village.

He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the corn field

c)

according to the disposal guidelines of the local authority.

d)

in the nearby pond

93.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

94.

Which of the following solutions will not make the bulb in Fig 14.2 glow?

(a)

(b)

(c)

(d)

a)

sodium chlorides

b)

copper sulphate

c)

silver nitrate

d)

sugar solution in diluted water

95.
Which of the following statements is incorrect about the conductivity of water?
a)
Rain water is a good conductor of electricity.
b)
On addition of table salt, water conducts electricity.
c)
On addition of lemon juice, water conducts electricity.
d)
Water becomes a good conductor of electricity when heated.
96.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

97.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
98.

The phenomenon of decomposition of an electrolyte when electricity is passed through is known as:

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

99.

Substances that conduct electricity are called (a)   .

100.

A cation has (a)   charge.

101.

Distilled water when mixed with salts becomes a (a)   conductor of electricity.

102.

Light emitting diodes (LED) glow even when a (a)   electric current flows through it.

103.

Change in colour is an example of the (a)   effect of current.

104.

There are (a)   wires attached to an LED.

105.

In an LED, the longer lead is attached to the (a)   terminal of the battery and the shorter lead to the negative terminal.

106.

Most liquids that conducts electricity are solutions of acids, bases and salts.

a)

True

b)

False

107.
Which of the following liquid is not a good conductor of electricity?
a)
Orange juice
b)
Tap water
c)
Vinegar
d)
Honey
108.

The object to be electroplated is taken as the ____________ .

a)

cathode

b)

anode

c)

electrode

d)

none of these

109.

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

a)

insulator

b)

conductor

c)

both a and b

d)

none of these

110.

The electrode connected to the negative terminal of a battery is known as

a)

anode

b)

negative pole

c)

cathode

d)

electrolyte

111.

When electricity is passed through tap water, the gases __________ and __________ are evolved.

(a)  

112.

An electric current brings about chemical changes in most conducting (a)   (solids/liquids).

113.

A cation has (a)   charge.

114.

When acidified water is electrolysed using carbon electrodes. What is produced at (+) and (-) electrodes.

a)

(+) - Oxygen; (-) - Hydrogen

b)

(+) - Oxygen; (-) - Carbon

c)

(+) - Hydrogen (-) - Oxygen

115.

To electroplate silver on Copper jewellery, the electrolyte that can be used is:

a)

Copper Sulphate

b)

Silver Nitrate

c)

Ammonium Chloride

d)

Sodium Chloride

116.

Chromium corrodes easily.

a)

True

b)

False

117.

sea water is an example of

a)

bad conductor

b)

strong electrolyte

c)

weak electrolyte

d)

none of these

118.

An electrolyte is a

a)

solid that conducts electricity.

b)

liquid that conducts electricity and breaks up chemically in the process.

c)

liquid that does not conduct electricity.

d)

solid that does not conduct electricity.

119.

On passing electricity through copper sulphate solution.

a)

copper is formed at anode.

b)

copper is formed at cathode

c)

oxygen is formed at anode.

d)

hydrogen is formed at cathode.

120.

In which of these is current not conducted by electrons?

a)

copper

b)

aluminium

c)

tap water

d)

mercury

121.

See the figure given below and select the correct statements regarding polymers.

1. Figure (X) shows structure of a monomer while figure (Y) shows structure of a polymer.

2. Small boxes in the structure represent monomers that are joined to give a polymer.

3. Figure (X) shows structure of a linear polymer while (Y) shows structure of a cross-linked polymer.

a)

1 and 2 only

b)

1 and 3 only

c)

2 and 3 only

d)

All are correct.

122.

Read the given statements and mark the appropriate answer.

Statement 1: Fabric made from this polyester does not get wrinkled easily.

Statement 2: Polyester is a natural fibre.

a)

Both statements 1 and 2 are true and

statement 2 is the correct explanation

of statement 1.

b)

Both statements 1 and 2 are true

but statement 2 is not the correct

explanation of statement 1.

c)

Both statements 1 and 2 are false.

d)

Statement 1 is true and statement 2

is false.

123.

Atul was climbing mountain and he wondered about the strength of rope in his hand which was stronger than a steel wire. This rope would have been made up of:

a)

Polyester

b)

Nylon

c)

Rayon

d)

Cotton

124.

Nylon is obtained by

a)

Treatment of wood pulp.

b)

Mixing coal, air and water.

c)

Solidifying water.

d)

Mixing acids and bases.

125.

Which of the following is not a blended fibre?

a)

Terrycot

b)

Terrylene

c)

Polycotton

d)

Terywool

126.

The first synthetic fibre formed from a natural material wood pulp is

a)

acrylic

b)

rayon

c)

nylon

d)

polyester

127.

A fibre which is as soft as wool is

a)

rayon

b)

nylon

c)

polyester

d)

acrylic

128.

Necklace : bead :: polymer : ________.

a)

Monomer

b)

Dimer

c)

Tetramer

d)

Trimer

129.

Main source of raw material for producing synthetic fibre is :

a)

CNG

b)

LPG

c)

Refined oil.

d)

Petroleum

130.

Which one of the following can be semi-synthetic fibre?

a)

Nylong

b)

Rayon

c)

Acrylic

d)

PET

131.

The long-chained polymers made by linking several ester units is called

a)

polythene

b)

polyester

c)

polypropene

d)

polystyrene

132.

Which of the following will soak less water?

a)

Nylon

b)

Silk

c)

Wool

d)

Cotton

133.

We should not wear synthetic clothes while cooking in the kitchen or in a laboratory.

a)

True

b)

False

134.

A polymer is a chain of many small units joined together which are called (a)   .

135.

From which part of sheep is wool made from?

a)

Skin

b)

Toes

c)

Fleece

d)

All the above

136.

A large single unit combined by many small units

a)

Polyester

b)

Polymer

c)

Terrycot

d)

Polywool

137.

Where was silk fibre discovered?

a)

France

b)

Germany

c)

India

d)

China

138.

Rayon is obtained from?

(a)  

139.

Rayon is a natural fibres

a)

True

b)

False

140.

Rayon is mixed with (a)   to make bedsheets

141.

Carpets are made from?

a)

Rayon and Cotton

b)

Cotton and Wool

c)

Rayon and Wool

d)

Wool

142.

Nylon was prepared from ____________

a)

Coal and Oil

b)

Coal, Water and Air

c)

Coal and Water

d)

Coal and Mixture of whatever and oil

143.

Nylon is

a)

Strong

b)

Dull

c)

Elastic

d)

Hard to wash

144.

Tents are made from

a)

Rayon

b)

Plastic

c)

Polyester

d)

Nylon

145.

Which type of Plastic is this?

a)

Thermoplastic

b)

Thermosetting plastic

146.

Property of Polyster

a)

Wrinkly

b)

Lustrous

c)

Crisp

d)

All of these

147.

Type of Polyester

a)

Terelane

b)

Nylon

c)

Rayon

d)

Acrylic

148.

Polyester is cheaper than Arcylic

a)

True

b)

False

149.

Thermoplastics

a)

Melamine

b)

Baketile

c)

Floor tiles

d)

PVC

150.

Is plastic biodegradable

a)

Yes

b)

No

151.

Type of Plastic in which oil and Water do not stick

(a)  

152.

Which substance give heat and light after combustion

a)

Flame

b)

Fuel

c)

Combustion

d)

None of these

153.

Coal burns with ____________________________

a)

Flame

b)

Only glow

c)

Both flame and glow

d)

None of these

154.

Burning of charcoal in a closed room will produce

a)

Carbon dioxide

b)

Nitrogen dioxide

c)

Carbon monoxide

d)

Sulphur dioxide

155.

The substances which have very low ignition temperature will

a)

Catch fire easily

b)

Will not catch fire

c)

Catch fire after some time

d)

None of these

156.

Ignition temperature is

a)

Lowest temperature at catch fire

b)

Higher temperature at catch fire

c)

Any temperature

d)

1000 C

157.

Combustion is a

a)

Natural process

b)

Chemical process

c)

Physical process

d)

None of these processes

158.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

159.

Which one of the following is fuel of our body?

a)

Petrol

b)

Diesel

c)

Water

d)

Food

160.

Which one of the following is combustible?

a)

Iron nail

b)

Glass

c)

Stone pieces

d)

Paper

161.

In the presence of water, ignition Temperature of paper is-

a)

Decrease

b)

Increase

c)

Remain constant

d)

None of these

162.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

163.

Fire extinguisher-

a)

Raise up temperature of fuel

b)

Bring down the temperature of fuel

c)

Cut off the supply of air

d)

None of these

164.

Which is the hottest part in the flame of the candle

a)

Yellow

b)

Wax part

c)

Black

d)

Blue

165.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

166.

Ideal fuel has ____________ calorific value

a)

Zero

b)

Low

c)

Moderate

d)

High

167.

Speed of light in a given medium is the indicator of its________.

a)

Refractive index

b)

Optical density

c)

Dispersion

d)

None of these

168.

What is the relation between refractive index and the optical density?

a)

More refractive index more is the density.

b)

More refractive index less is the density

c)

Less refractive index more is the density

d)

No relation between refractive index and optical density

169.

The ratios of the speeds of light in a given pair of media gives us________.

a)

Absolute refractive index

b)

Relative refractive index

c)

Optical density

d)

None of these

170.

How the pond appears to be, when it is seen from outside?

a)

Seems Deeper

b)

Seems shallower

c)

Seems very deep

d)

No change is there

171.

What is the relation between angle of incidence and angle of refraction when light goes from optically rarer to denser

a)

Angle I is equal to angle r

b)

Angle I is greater than angle r

c)

Angle I is less than angle r

d)

No relation between these angles

172.

What we call the final ray coming out of the glass slab?

a)

Incident ray

b)

Refracted Ray

c)

Reflected ray

d)

Emergent Ray

173.

Prisms usually have___________ faces.

a)

Square

b)

Triangular

c)

Rectangular

d)

Circular

174.

How many colours does the white light consist of?

a)

5

b)

6

c)

7

d)

8

175.

Dispersion of light referred to as________.

a)

Bending of light

b)

Splitting of light in seven colours

c)

Splitting of light in primary colours

d)

Bouncing back of light

176.

What is the reason of splitting of white light?

a)

Change of speed of all colours

b)

Breaking down of colours

c)

Falling obliquely on the surface

d)

Falling on the normal of the surface

177.

Which colour has the maximum speed in the prism?

a)

Violet

b)

Yellow

c)

Orange

d)

Red

178.

Which colour bends the maximum in the prism?

a)

Violet

b)

Indigo

c)

Red

d)

Green

179.

Why the rainbow forms in the nature?

a)

Because of refraction

b)

Because of dispersion

c)

Because of reflection

d)

Because of colours

180.

What we call the portion of a transparent refracting medium bounded by two surfaces?

a)

Glass

b)

Mirror

c)

Lens

d)

Beads

181.

Which spherical lens is also known as converging lens?

a)

Double convex lens

b)

Double concave lens

c)

Plano concave

d)

None of these

182.

Which type of medium is needed for refraction of light?

a)

Transparent

b)

Translucent

c)

Opaque

d)

None of these

183.

Name the phenomenon happens when light rays falls on a shining or polished surface.

a)

Refraction of light

b)

Reflection of light

c)

Dispersion of light

d)

None of these

184.

what we call the phenomenon when a light ray changes its direction when passing from one transparent medium to another transparent medium?

a)

Reflection of light

b)

Refraction of light

c)

Dispersion of light

d)

None of these

185.

Which condition is needed for a light ray to bend in a transparent medium?

a)

It should fall perpendicularly

b)

It should fall on a normal

c)

It should fall obliquely

d)

None of these

186.

How the coin appears to be when it is there in the beaker containing water?

a)

It come upwards

b)

It appears to be raised

c)

No change in its position

d)

Coin becomes larger

187.

What is the speed of light in vacuum?

a)

2 lakh kilometres per second

b)

5 lakh kilometre per second

c)

4 lakh kilometre per second

d)

3 lakh kilometre per second

188.

How the speed of light changes when it travels from optically rarer to optically denser medium?

a)

No change in its speed

b)

Slow down

c)

Get faster

d)

Double of the previous speed

189.

When the Ray of light get fasten up?

a)

Moving from optically rarer to denser

b)

Moving from optically denser to rarer

c)

Travelling on the path of normal

d)

Never fasten up

190.

What is the unit of refractive index?

a)

Metre per second

b)

Metre per second square

c)

Kilometre per second

d)

No units

191.

In absolute refractive index we compare the speed of light of a medium with the speed of light in__________.

a)

Water

b)

Glass

c)

Vacuum

d)

Diamond