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Phys & Chem - VIII Science

Total questions: 110

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

Which one of the following is not a fossil fuel?

a)

petrol

b)

coke

c)

charcoal

d)

coal

2.

The major component of LPG is :-

a)

hydrogen

b)

butane

c)

methane

d)

natural gas

3.

The gas which occurs above the petroleum oil trapped under the rocks is called : -

a)

compressed natural gas

b)

natural gas

c)

petroleum gas

d)

methane

4.

Napthalene balls are obtained from fractional distillation of (a)   .

5.

__________is almost pure form of carbon.

a)

coal

b)

petroleum

c)

coal tar

d)

coke

6.

One of the following is not an exhaustible source of energy. This one is :-

a)

natural gas

b)

petroleum gas

c)

coal gas

d)

biogas

7.

The process of separation of different constituents from petroleum is called (a)   .

8.

Which of the following is used as a reducing agent in the extraction of iron metal ?

a)

coal tar

b)

coal

c)

coke

d)

bitumen

9.

Which of the following is not obtained as a fraction during the refining of petroleum ?

a)

kerosene

b)

coal gas

c)

bitumen

d)

diesel

10.

___________is used in skin ointments.

a)

paraffin wax

b)

lubricating oil

c)

kerosene

d)

diesel

11.

The worst option to put off fire caused due to petrol is :-

a)

throwing sand over the fire

b)

using water

c)

using fire extinguisher

12.

Which of the following produces more heat on burning?

a)

LPG

b)

Petrol

c)

Diesel

d)

kerosene

13.

Name the fuel used in jet aircrafts.

(a)  

14.

Coal is also known as :-

a)

black gold

b)

black diamond

c)

black emerald

d)

blue diamond

15.

Which one of the following is an inexhaustible natural resource?

a)

coal

b)

petroleum

c)

water

d)

forests

16.

Which of the following does not conduct electricity?

a)

Sugar solution

b)

 Vinegar solution

c)

Lemon juice solution

d)

Caustic soda solution

17.

An electric current can produce

a)

heating effect

b)

chemical effect

c)

magnetic effect

d)

all of the above

18.

Pure or distilled water is a

a)

poor conductor

b)

good conductor

c)

Both

d)

None of the above

19.

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

20.

Which of the following is a bad conductor of electricity?

a)

 Distilled water

b)

Silver nitrate

c)

 Sulphuric acid

d)

Copper sulphate

21.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

22.

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

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

23.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

24.

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

25.
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.
26.

Alloys of metals

a)

allow electric current to flow through them

b)

do not allow electric current to flow through them

c)

sometimes allow and sometimes do not allow electric current to flow through them

d)

None of these

27.

Tin cans used for storing food are made by electroplating

a)

copper on iron

b)

iron on tin

c)

tin on zinc

d)

tin on iron

28.

The filament of the bulb gets heated to a high temperature due to the

a)

magnetic effect of current

b)

heating effect of current

c)

chemical effect of current

d)

all of these

29.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

30.

LED stands for

(a)  

31.

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

32.

Radhika wants to electroplate a plate with ZINC. She has a Zinc bar and the plate. But she does not know which should be the anode and which should be the cathode.

a)

Zinc Bar - Anode, Plate - Cathode

b)

Zinc Bar - Cathode, Plate - Anode

c)

Both Anode and Cathode should be Zinc

33.

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

34.

Flow of electron is called

a)

Electroplating

b)

Electric current

c)

Electrodes

d)

Electrolyte

35.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

36.

Which of these will conduct electricity

a)

tap water

b)

distilled water

37.

Conduction of electricity in liquids occurs through electrons.

a)

True

b)

False

38.

When a liquid conducts electricity, a process other than conduction also takes place. What process is this?

a)

electrolysis

b)

electrochemical reaction

c)

electroplating

d)

oxidation

39.

Electric current is the flow of particles with

a)

a negative charge.

b)

a positive charge.

c)

both positive and negative charges flowing opposite to each other.

d)

either positive or negative charge depending on the material.

40.

Which of the following is not a conductor of electricity?

a)

tap water

b)

salt water

c)

petrol

d)

lime juice

41.

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.

42.

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.

43.

In which of these is current not conducted by electrons?

a)

copper

b)

aluminium

c)

tap water

d)

mercury

44.

A battery is used as a driving force in an electric circuit. True or false?

a)

True

b)

false

45.

which of these particles are responsible for the flow of electric current−electrons, protons or neutrons?

a)

electrons

b)

protons

c)

neutrons

46.

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

(a)  

47.

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

48.

Substances that conduct electricity are called (a)   .

49.

Substances that do not conduct electricity are called (a)   .

50.

A cation has (a)   charge.

51.

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

52.
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
53.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

54.

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

a)

anode

b)

cathode

c)

elctrode

55.
A sound with a high frequency has a _____ pitch. A sound with a ____ frequency has a low pitch.
a)
high, low
b)
low, high
c)
medium, high
d)
high, medium
56.
A sound that bounces off a surface is called an ________.
a)
loud sound
b)
echo
c)
repeat
d)
quiet sound
57.
A back and forth movement of matter
a)
volume
b)
vibration
c)
pitch
d)
frequency
58.
how high or low a sound is
a)
frequency
b)
volume
c)
vibration
d)
pitch
59.
Sound travels FASTEST through which of these materials?
a)
Air
b)
Empty space
c)
Metal
d)
Water
60.
Sound is caused by? 
a)
force
b)
vibrations
c)
instruments
61.
Sound is a form of? 
a)
energy
b)
pitch
c)
volume
62.
Why is sound able to travel faster through a solid than a gas?
a)
Gas molecules are packed tightly.
b)
Sound does not travel faster through a solid than a gas.
c)
Solid molecules are packed tightly.
d)
Gas molecules move slowly.
63.
Sound does not travel in space because
a)
Space is too far away.
b)
There is no matter in space.
c)
Space is the final frontier
d)
Space has planets.
64.
Why is the school library covered with carpet?
a)
So everyone can make a lot of noise
b)
to help absorb sounds to keep it quiet
c)
because it looks good
d)
to help absorb sounds so it can stay noisy
65.

______________ sounds have a larger amplitude

a)

quiet

b)

loud

66.

What are the units for intensity?

a)

hertz

b)

decibels

c)

dopplars

d)

sonars

67.

Which property of a sound wave determines how close together the particles are in the compression region?

a)

amplitude

b)

frequency

c)

wavelength

d)

wave speed

68.
What is Pitch?
a)
How loud or soft a sound is
b)
muscle that holds vocal cords
c)
movement back and forth
d)
how high or low a sound is
69.
How does sound travel?
a)
Sounds travels in waves
b)
sound travels slow
c)
sound travels fast
d)
sound doesn't travel
70.
What color has the shortest wavelength, or the highest frequency?
a)
yellow
b)
blue
c)
red
d)
violet
71.
What does reflection mean?
a)
bending light
b)
bouncing light
72.
What does refraction mean?
a)
bending light
b)
bouncing light
73.

Light travels through an object during

a)

absorption

b)

reflection

c)

transmission

d)

diffraction

74.
The full spectrum of light energy is called the__________
a)
broad spectrum
b)
electromagnetic spectrum
c)
helium spectrum 
d)
natural light spectrum
75.

What is the earth's primary source of light energy?

a)

moon

b)

sun

c)

waves

d)

fire

76.
A cut piece of clear glass or plastic in the form of a triangle or other geometric shape.
a)
Person
b)
Prison
c)
Prism
d)
Preacher
77.
When light strikes an object with a rough surface, photons bounce off at random angles.
a)
Occer
b)
Scope
c)
Scattering
d)
Scattegories
78.
Transfer of energy when a wave disappears into a surface
a)
Transparent
b)
Refraction
c)
Reflection
d)
Absorption
79.
Light travels
a)
around corners
b)
in a straight line
80.
mirror
a)
absorbs
b)
reflects 
c)
refracts
81.
smooth, shiny surfaces
a)
reflect
b)
refract
c)
absorb
82.
sunglasses and tinted windows
a)
refraction
b)
absorption
c)
reflection
83.
rainbow
a)
light is reflected
b)
light is refracted
c)
light is absorbed
84.
Which material is NOT translucent?
a)
Brick
b)
Tissue paper
c)
Thin sheet of plastic
85.
What is light?
a)
A form of energy
b)
A form of sound
c)
bright stuff
d)
A form of excitement
86.
What is the main source of light?
a)
Light bulbs
b)
Candles
c)
Sun
d)
Fluorescent lights
87.
What color has the shortest wavelength, or the highest frequency?
a)
yellow
b)
blue
c)
red
d)
violet
88.
What is the correct order of the colors of the rainbow?
a)
Red, orange, yellow, green, blue, indigo, violet
b)
red, orange, yellow, blue, green, indigo, violet
c)
orange, yellow, red, blue, purple, indigo
d)
red, orange, yellow, green, indigo
89.

Which travels faster?

a)

sound

b)

light

c)

water

90.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
91.
Fluids can also include__ and__. 
a)
solids and liquids
b)
solids and gases
c)
liquids and gases
d)
liquids
92.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
93.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
94.
Atmospheric pressure increases as you move towards lower elevations and decreases as you move into higher elevations.
a)
True
b)
False
95.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
96.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
97.

In Fig two boys A and B are shown applying force on a block. If the block moves towards the right, which one of the following statements is correct?

a)

Magnitude of force applied by A is greater than that of B

b)

Magnitude of force applied by A is smaller than that of B.

c)

Net force on the block is towards A.

d)

Magnitude of force applied by A is equal to that of B.

98.

A brick is kept in three different ways on a table as shown in Fig. The pressure exerted by the brick on the table will be

a)

maximum in position A

b)

maximum in position B

c)

maximum in position C

d)

equal in all cases.

99.

which force is non contact force

a)

gravitational

b)

magnetic

c)

electrostatic

d)

all of the above

100.

what kind of force is Friction

(a)  

101.

Watch the green man. Which force(s) are acting in this situation?

a)

Frictional Force only.

b)

Gravitational Force only.

c)

Muscular Force only.

d)

Muscular and Gravitational Force.

102.

At higher altitudes, which one becomes true?

a)

Higher the altitude, higher the atmospheric pressure.

b)

Higher the altitude, greater the force exerted by air molecules.

c)

It's an example of fluid pressure.

d)

The higher you go, lesser is the atmospheric pressure.

103.

Watch the green man skating. Choose all options that are correct.

a)

Both Contact and Non-Contact forces acting here.

b)

Non-Contact force is only acting here.

c)

Rolling Friction and Gravitational Force are present.

d)

Sliding Friction and Gravitational Force are present.

104.

Observe the image carefully. What's NOT happening here?

a)

People on the left side win the game.

b)

Nobody wins.

c)

This is balanced situation.

d)

Resultant Force is zero.

105.
What is force?
a)
A push exerted on an object
b)
A push or pull exerted on an object
c)
A pull exerted on an object
d)
Nothing
106.

When you increase your depth under water, the water pressure on your body

a)

increases

b)

decreases

c)

stays the same

107.
If there are two forces going in the same direction how would you find the net force?
a)
Subtract
b)
Add
c)
Neither
d)
Multiply
108.
How do you calculate Net Force if the forces are going different directions?
a)
add them together
b)
you don't
c)
using pi
d)
subtract them
109.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
110.
What is the instrument that measures air pressure called?
a)
Graduated cylinder
b)
Barometer
c)
Force scale
d)
Anemometer

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