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SOF Test 1 OCT 2023 Class 8 For NSO

Total questions: 100

Worksheet time: 3hrs 30mins

Name
Class
Date
1.

THE PRESSURE WHICH IS EXERTED BY THE AIR AROUND US IS KNOWN AS:

a)

FRICTION

b)

FORCE

c)

ATMOSPHERIC PRESSURE

d)

MUSCULAR FORCE

2.

FORCE ACTING ON PER UNIT AREA IS CALLED:

a)

FORCE

b)

NON-CONTACT FORCE

c)

PRESSURE

d)

CONTACT FORCE

3.

A _____ EXERTED BY AN OBJECT ON ANOTHER IS FORCE.

a)

PUSH OR PULL

b)

CONTACT FORCES

c)

MAGNITUDE

d)

PRESSURE

4.

The force exerted by the earth to pull the object towards itself is called:

a)

electrostatic force

b)

gravitational force

c)

muscular force

d)

contact force

5.

Muscular force is also called ___________ force.

a)

non-contact

b)

contact

c)

gravitational

d)

magnetic

6.

The force exerted by a charged body on another charge:

a)

gravitational force

b)

electrostatic force

c)

non-contact force

d)

contact force

7.

Force changes the

a)

motion of body

b)

speed of body

c)

shape of body

d)

all of these

8.

The force exerted by our muscle is called:

a)

electrostatic force

b)

muscular force

c)

gravitational force

d)

non-contact force

9.

1 kilogram weight is equal to

a)

98 N

b)

9.8 N

c)

0.98 N

d)

0.098 N

10.

A spring balance is used for measuring:

a)

mass

b)

weight

c)

pressure

d)

speed

11.

Two boys A and B are applying force on a block. If the block moves towards the boy A, 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 B.

d)

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

12.

When two forces act in opposite directions, then net force acting is the:

a)

sum of two forces

b)

difference between two forces

c)

both of these

d)

none of these

13.

The strength of force is expressed by its

a)

weight

b)

mass

c)

magnitude

d)

longitudinal force

14.

Leaves fall down on the ground due to:

a)

electrostatic force

b)

magnetic force

c)

gravitational force

d)

muscular force

15.

State of motion is described by

a)

Position of rest

b)

Position of motion

c)

Both by the state of rest or motion

d)

none of these

16.

Complete the sentence. Friction always ____________

a)

Helps the motion

b)

Opposes the motion

c)

Both of these

d)

None of these

17.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
18.
What direction does friction act relative to motion?
a)
in the same direction
b)
in the opposite direction 
c)
need more information
d)
depends on the force
19.
The amount of friction depends on the weight of the objects pressing together.
a)
True
b)
False
20.
What type of friction is not moving?
a)
static
b)
sliding
c)
fluid
d)
rolling
21.
How can friction be reduced?
a)
reduce the force acting between the 2 surfaces
b)
reduce the roughness of the 2 surfaces coming in contact
c)
use wax, grease or oil
d)
all of the above are ways of reducing friction
22.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
23.
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
24.
How would the absence of friction affect a marble traveling on a long, straight path?
a)
The marble’s speed would decrease.
b)
The marble’s speed would increase.
c)
The marble would stop immediately. 
d)
The marble would remain at constant speed.
25.
Wheels on a skateboard most likely experiences-
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction
26.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
d)
less friction doesn't affect speed
27.
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
28.

Imagine you decide to jump out of an airplane 🛩

Which force is going to pull you down towards earth

a)

Fluid Friction

b)

Static Friction

c)

Gravity

d)

The wind from the airplane

29.

When you jump out of a plane to go skydiving 🪂 you thankfully have a parachute so you can safely land 🛫. Which answer choice explains why the parachute helps you land safely

a)

While gravity pulls you down very quickly, Air Resistance (fluid friction) pushes back against gravity and your parachute, slowing you down

b)

While gravity pushes you down very slowly, Air Resistance (fluid friction) pulls back against gravity and your parachute, which means you can land safely

c)

When you have a parachute gravity is not able to pull you down as fast as it normally can

d)

The parachute will get caught on something on your way down which will save your life

30.

these are used to reduce unwanted heat in cars

a)

powder

b)

oil

c)

coolants

31.

The sound of an object has 120 vibrations per minute. What is the frequency and time period?

a)

60 Hz & 0.167 seconds

b)

3 Hz & 0.33 seconds

c)

5 Hz & 0.2 seconds

d)

2 Hz & 0.5 seconds

32.

Which of the following is the inverse of time period?

a)

Amplitude

b)

Frequency

c)

Pitch

d)

Quality

33.
Sound waves travel the FASTEST through _____________.
a)
gases
b)
liquids
c)
solids
34.
Sound is caused by....
a)
molecules
b)
vibrations
c)
people
d)
space
35.
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
36.
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.
37.

Speed of light in air is:

a)

5100 m s-1

b)

3*108m s-1

c)

330 m s-1

d)

3*1010 m s-1

38.
Which of the following would you hear as a low pitched sound? 
a)
sound wave with a frequency of 50 Hz
b)
sound wave with frequency of 10,000 Hz
c)
sound wave with an intensity of 10 dB
d)
sound wave with an intensity of 100 dB
39.
High pitch sounds are caused by a ______ vibration
a)
fast 
b)
slow
c)
hard
d)
soft
40.
If a sound has a high amplitude then it also has a ____________!!!
a)
fast echo
b)
slow pitch
c)
high volume
d)
low volume
41.

Ryan makes an instrument from a drinking straw as shown. If he cuts the straw in half, what will happen to the pitch?

a)

decreases

b)

increases

c)

it will remain the same

d)

there is no sound

42.
Area of a longitudinal wave where particles are CLOSE together.
a)
Compression
b)
Rarefaction
43.

The volume of a sound is measured in units called ________

a)

decibels

b)

liters

c)

sound waves

44.
If you want to change the pitch of a sound, you have to change the ___
a)
frequency
b)
amplitude
c)
speed
d)
volume
45.
When a sound is louder what measurement gets bigger?
a)
Frequency 
b)
Amplitude 
c)
Wavelength 
d)
Crest
46.
What is B?
a)
crest
b)
trough
c)
compression
d)
rarefaction
47.
After the train passed, the pitch of the train whistle became lower. This change in sound would be represented by what change in the diagram above? 
a)
The distance represented by C would increase. 
b)
The distance represented by C would decrease. 
c)
The distance represented by D would increase. 
d)
The distance represented by D would decrease. 
48.
A student holds two vibrating objects.  Object A is vibrating faster than object B.  Which statement is true?
a)
A is louder than B
b)
B is louder than A
c)
A will have a higher pitch than B
d)
B will have a higher pitch than A
49.
How is sound produced by these instruments?
a)
Striking the surface
b)
vibrating columns of air
c)
plucking the strings
50.

What will be the frequency, if the string of a guitar is tight?

a)

low

b)

high

c)

no change

d)

none of these

51.

Which of the following metals is used in electroplating to make objects appear shining?

a)

Iron

b)

Copper

c)

Chromium

d)

Aluminium

52.
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.
53.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

54.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

55.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

56.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

57.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

58.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

59.

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

60.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

61.

one of the following is not used for electroplating metal articles. the one is -

a)

nickel

b)

chromium

c)

sodium

d)

silver

62.

The glowing of filament bulb is due to

a)

Chemical effect of current

b)

magnetic effect of current

c)

Physical effect of electric current

d)

Heating effect of electric current

63.

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

64.

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

65.

While trying to put out fire in an electrical appliance, we should

a)

pour distilled water on it

b)

pour rain water on it

c)

pour tap water on it

d)

none of these

66.

The article to be electroplated is made

a)

the anode

b)

the cathode

c)

either anode or cathode

d)

none of these

67.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

68.

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

69.

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

a)

(+) - Oxygen; (-) - Hydrogen

b)

(+) - Oxygen; (-) - Carbon

c)

(+) - Hydrogen (-) - Oxygen

70.

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

71.

Metals are generally hard. Which of these metals is an exception and is soft and can be cut with a knife?

a)

Iron

b)

Gold

c)

Sodium

d)

Magnesium

72.

Which of the following is found in liquid state room temperature?

a)

Mercury

b)

Aluminum

c)

Sodium

d)

Silver

73.

Which of the following properties of copper is not responsible for making it suitable for making electric wires?

a)

Its color

b)

It is solid

c)

It is a good conductor of electricity

d)

Its ductility

74.

Which non-metal reacts with air vigorously and catches fire?

a)

Sodium

b)

Nitrogen

c)

Phosphorous

d)

Carbon

75.

Which of the following materials is not ductile?

a)

Aluminum

b)

Silver

c)

Sulphur

d)

Copper

76.

Which metal hydroxide can be used to cure acidity in the stomach?

a)

Iron Hydroxide

b)

Copper Hydroxide

c)

Zinc Hydroxide

d)

Magnesium Hydroxide

77.

Which gas is produced when metals react with acids?

a)

Nitrogen

b)

Ozone

c)

Carbon Dioxide

d)

Hydrogen

78.

_____________ solution is formed when a piece of iron is put in copper sulphate solution?

a)

Copper carbonate

b)

Iron oxide

c)

Iron sulphate

d)

None of these

79.

Which gas is formed when non-metals react with water?

a)

Carbon Dioxide

b)

Hydrogen

c)

Non-metals do not react with water.

d)

Nitrogen

80.

Which of these metals does not react with dilute hydrochloric acid even on heating but reacts with sulphuric acid?

a)

Copper

b)

Iron

c)

Zinc

d)

Aluminum

81.

This non-metal is used in purification of water?

a)

Sulphur

b)

Hydrogen

c)

Chlorine

d)

Carbon

82.

The green coating acquired on copper when kept in air for a long time consists of copper hydroxide and (a)   .

(WRITE ANSWER IN BLOCK LETTERS)

83.

Which is the strongest metal on earth? (BONUS)

a)

Diamond

b)

Titanium

c)

Tungsten

d)

Calcium

84.

The hydroxide of non-metal sulphur turns red litmus paper to __________.

a)

Blue

b)

Purple

c)

Green

d)

It remains the same

85.

The greenish coating on copper is called (a)   .

(BONUS)

(WRITE IN BLOCK LETTERS)

86.

Which of these is sonorous?

a)

Diamond

b)

Copper

c)

Sulphur

d)

Phosphorous

87.

In galvanization a layer of ___________ is deposited on iron to prevent it from rusting.

a)

Zinc

b)

Chromium

c)

Titanium

d)

Tungsten

88.

This material is stored in kerosene. It is___________

a)

Sulphur

b)

Potassium

c)

Sodium

d)

Phosphorous

89.

Which of the following polymers is not made by humans in an industrial process?

a)

Melamine

b)

Bakelite

c)

Nylon

d)

Acrylic

e)

Silk

90.

Which of the following statements is/are false?

a)

Cellulose is a polymer that is made up of a large number of small glucose molecules joined one after the other.

b)

Wood contains a very less amount of cellulose polymer.

c)

The small molecules that join together to form a polymer are called monomers

91.

Which of the following man-made fibers is made from a natural material called cellulose?

a)

Polyester

b)

Rayon

c)

Nylon

d)

Acrylic

92.

Which of the following is not a property of nylon?

a)

Nylon is a thermoplastic polymer.

b)

Nylon fibers are fairly strong and elastic

c)

Nylon fibers are lightweight and lustrous.

d)

It is cheaper than natural silk and can be woven like silk fiber.

93.

Which of the following fiber threads is actually stronger than a steel wire of similar thickness?

a)

Wool

b)

Silk

c)

Nylon

d)

Cotton

94.

Which of the following is not a characteristic of synthetic fibers?

a)

Synthetic fibers are very durable.

b)

Synthetic fibers absorb very little water.

c)

Synthetic fibers are wrinkle resistant.

d)

Synthetic fibers are extremely thick and strong.

95.

Polyester is a synthetic fiber in which the polymer units are linked by ester groups. Which of the following is not a property of polyester?

a)

Polyester fibers are weaker in strength than nylon fibers.

b)

Polyester fiber is not attacked by moths and ordinary chemicals.

c)

Polyester is a thermoplastic polymer.

d)

Polyester fibers are softer than nylon fibers.

96.

Which of the following is a fire-resistant plastic and is used to coat the uniforms of firemen?

a)

Teflon

b)

Melamine

c)

Bakelite

d)

PVC

97.

Which of the following plastics is used for making electric switches, plugs and sockets?

a)

Polythene

b)

Polyvinyl chloride Melamine

c)

Melamine

d)

Bakelite

98.

Which of the following arrangements is the correct order of fabrics in their decreasing strength?

a)

Polyester - Nylon - Silk - Cotton - Wool

b)

Nylon - Polyester - Silk - Cotton - Wool

c)

Wool - Nylon - Silk - Cotton - Polyester

d)

Polyester - Nylon - Cotton - Silk - Wool

99.

In which of the following plastics are the long polymer chains cross-linked with one another?

a)

Acrylic

b)

Bakelite

c)

Polyester

d)

Nylon

100.

Polycot is made by mixing two types of fibres namely

a)

Silk+cotton

b)

Wool+cotton

c)

Polyester+Cotton

d)

Polyethylene+Cotton

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