CBSE Class 8 Science Multiple Choice Questions (MCQs) & Answers

CBSE Class 8 Science Multiple Choice Questions(MCQs) & Answers CBSE Class 8 Science QUESTIONS

CBSE Class 8 Science Multiple Choice Questions(MCQs)& Answers

1 Initially girls grow _____ than boys.
A Faster
B Slower
C Both of these
D None of these

Answer: Faster
2 There are__ __ pairs of chromosome in human cell.
A 23
B 22
C 46
D All are wrong

Answer: 23
3 Thyroxin produced by
A Pituitary gland
B Adrenal gland
C Thyroid gland
D Testes

Answer: Thyroid gland
4 The egg is
A Egg gamete
B Female gamete
C Both of these
D None of these

Answer: Female gamete
5 Larynx is called
A Voice box
B Respiratory organ
C Music box
D None of these

Answer: Voice box
6 The charge acquired by a glass rod when it is rubbed with silk is
A Negative
B Positive
C Both
D None

Answer: Positive
7 Benjamen Franklin showed lightening in
A 1725
B 1527
C 1752
D 1572

Answer: 1752
8 Sparkers can be seen on electric pole. Which wires become
A Loose
B Wrinkle
C Tight
D None

Answer: Loose
9 Interaction of charges is called
A Lightening
B Electrical discharge
C Earthing
D Electricity

Answer: Lightening
10 Leaves or fruits fall on the ground due to
A magnetic force
B gravitational force
C electrostatic force
D muscular force

Answer: gravitational force
11 The force between two charged bodies is called
A muscular force
B gravitational force
C magnetic force
D electrostatic force

Answer: electrostatic force
12 The strength of force is expressed by?
A weight
B mass
C magnitude
D longitudinal force

Answer: magnitude
13 Fluid are____
A Gases
B Liquids
C Gases and liquids both
D None of these

Answer: Gases and liquids both
14 What kind of substances are known as lubricants
A Increase friction
B Decrease friction
C Increase or decrease friction
D None of these

Answer: Decrease friction
15 Friction is a __________
A Contact force
B Non-contact force
C Magnetic force
D None of these

Answer: Contact force
16 Which one of these characteristics does a smooth surface has?
A Less frictional force
B More frictional force
C Sometimes less and sometimes more force
D All of above

Answer: Less frictional force
17 Complete the sentence. Friction always ____________
A helps the motion
B opposes the motion
C both of these
D none of these

Answer: opposes the motion
18 Microorganisms are
A Unicellular
B Multi-cellular
C Both
D None of these

Answer: Multi-cellular
19 Penicillium is a
A Algae
B Fungus
C Bacteria
D Yeast

Answer: Fungus
20 Malaria Is caused by
A Protozoa
B Virus
C Algae
D Bacteria

Answer: Protozoa
21 Rhizobium becteria
A Help in digestion
B Help in nitrogen fixation
C Cause diseases
D All of the above

Answer: Help in nitrogen fixation
22 Which substance give heat and light after combustion
A Flame
B Fuel
C Combustion
D None of these

Answer: Fuel
23 Like fuel the sun also provides heat and light. The process taking place in the sun is called
A Combustion
B Nuclear process
C Burning
D All of these

Answer: Nuclear process
24 Coal burns with ______
A Flame
B Only glow
C Both flame and glow
D None of these

Answer: Only glow
25 Burning of charcoal in a closed room will produce
A Carbon dioxide
B Nitrogen dioxide
C Carbon monoxide
D All of these

Answer: Carbon monoxide
26 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

Answer: Catch fire easily
27 CNG and LPG are the examples of
A Solid fuels
B Liquid fuels
C Gaseous fuels
D They are not fuels

Answer: Gaseous fuels
28 Ignition temperature is
A Lowest temperature at catch fire
B Higher temperature at catch fire
C Any temperature
D None of these

Answer: Lowest temperature at catch fire
29 Combustion is a
A Chemical process
B Physical process
C Both of these processes
D None of these processes

Answer: Chemical process
30 The control unit of cell is
A Nucleus
B Cell wall
C Cytoplasm
D All of these

Answer: Nucleus
31 Chloroplast is found in
A Plant cell only
B Animal cell only
C Both of these
D None of these

Answer: Plant cell only
32 The functional unit of life is called
A Cell
B Egg
C Nucleus
D None of these

Answer: Cell
33 The kitchen of the cell is called
A Cell wall
B Nucleus
C Vacuoles
D Plastids

Answer: Plastids
34 The power house of cell is called
A Cell wall
B Mitochondria
C Ribosomes
D Nucleus

Answer: Mitochondria
35 Which of the following is obtained from coal tar ?
A Petrol
B Coke
C Air
D Naphthalene balls

Answer: Naphthalene balls
36 Which of the following is manmade resource?
A Air
B Water
C Soil
D Parks

Answer: Parks
37 Which of the following is natural resource?
A Car
B Bus
C Water
D Parks

Answer: Water
38 An example of fossil fuel is
A Wood
B Animal waste
C Coal
D All of these

Answer: Coal
39 PCRA stands for
A Public Conservations Research Association
B Petroleum Conservation Research Association
C Public Council of Research Association
D Partial Counting of remaining Amendment

Answer: Petroleum Conservation Research Association
40 The first oil well was drilled in
A USA
B India
C USSR
D UK

Answer: USA
41 Coaltar contains about
A 300 substance
B 400 substance
C 200 substance
D 100 substance

Answer: 200 substance
42 Purest form of carbon is
A Coal
B Charcoal
C Coke
D All of these

Answer: Coke
43 The products of combustion are
A Oxygen and water
B Carbon dioxide and water
C Only carbon dioxide
D Only oxygen

Answer: Carbon dioxide and water
44 Poor conductors are
A Plastics
B Clothes
C Wood
D All of these

Answer: All of these
45 Copper wire is a
A Good conductor
B Poor conductor
C Both A and B
D None of this

Answer: Good conductor
46 An electrolyte is
A a metal
B a solution
C a liquid that conducts current
D all of above

Answer: a liquid that conducts current
47 Adding common salt to distilled water makes it
A Good conductor
B Insulator
C No
D Both a and b

Answer: Good conductor
48 Electroplating is based on
A Magnetic effect of electricity
B Chemical effect of electricity
C Heating effect of electricity
D Physical effect of electricity

Answer: Chemical effect of electricity
49 Plastic wire is
A An insulator
B A conductor
C Both of these
D None of these

Answer: An insulator
50 There are following zones of a flame
A Two
B Three
C Four
D No any zone

Answer: No any zone
51 Leaves or fruits fall on the ground due to
A magnetic force
B gravitational force
C electrostatic force
D muscular force

Answer: gravitational force
52 Lubricants ________
A Increase friction
B Reduce friction
C Both (a) and (b)
D None

Answer: Reduce friction
53 Friction is a /an_______
A Evil
B Foe
C Both (a) and (b)
D None

Answer: Both (a) and (b)
54 On what force of friction depends?
A Smoothness of surface
B Roughness of surface
C Inclination of surface
D All of above

Answer: All of above
55 Scientist who discovered fermentation is
A Alexander Fleming
B Louis Pasteur
C John Mendal
D Edward Jenner

Answer: Louis Pasteur
56 Amoeba belongs to
A Algae
B Fungi
C Protozoa
D Virus

Answer: Protozoa
57 Mushroom belongs to
A Algae
B Virus
C Fungi
D None of these

Answer: Fungi
58 Amount of nitrogen in the atmosohere is
A 58%
B 68%
C 78%
D 88%

Answer: 78%
59 Vaccine for small pox is discorvered by
A Louis Pasteur
B Alexander Fleming
C Edward Jenner
D John Mendal

Answer: Edward Jenner
60 Which planet appears to be yellowish?
A Asteroids
B Mars
C Uranus
D Saturn

Answer: snakes
61 On which planet the life exists?
A Earth
B Moon
C Jupiter
D None

Answer: Earth
62 Which is the nearest planet to the sun?
A Neptune
B Mars
C Mercury
D Earth

Answer: Mercury
63 Which is the brightest planet in the universe?
A Mercury
B Venus
C Earth
D Saturn

Answer: Venus
64 Cloning is a mode of
A Sexual production
B Asexual production
C Both A and B
D None of these

Answer: Asexual production
65 Foetus is the
A Well developed embryo
B Developing embryo
C A zygote
D Male gamete

Answer: Well developed embryo
66 A sperm consists of
A One part
B Two parts
C Three parts
D Four parts

Answer: Three parts
67 How many modes of reproduction are there in animals?
A One type
B Two types
C Three types
D Four types

Answer: Two types
68 Egg are formed in the
A Testes
B Penis
C Ovary
D None of these

Answer: Ovary
69 Deforestation takes place by
A Human activities
B Only by natural resources
C Both of these
D None of these

Answer: Both of these
70 Cutting of trees on large scale is called
A Deforestation
B Reforestation
C Afforestation
D None of these

Answer: Deforestation
71 A place in environment where an organism lives is ________
A Home
B Resort
C Habitat
D Reservoir

Answer: Habitat
72 Noise pollution is harmful for
A Human
B Cat
C Bird
D All

Answer: All
73 Sound propagates maximum in
A Gas
B Liquid
C Solid
D All

Answer: Solid
74 Voice box or larynx of human process
A Sound
B Wind
C Loudness
D None

Answer: Sound
75 To an fro motion of an object is called
A Waves
B Amplitude
C Vibration
D All of the above

Answer: Vibration
76 Sound is kind of
A Work
B Energy
C Force
D None

Answer: Energy
77 The pitch of sound depends on
A frequency
B amplitude
C both of these
D none of these

Answer: frequency
78 Large amplitude of sound vibrations will produce:
A Loud sound
B Meak sound
C Slow sound
D Shreak

Answer: Loud sound
79 The voice box is called:
A Stomach
B Heart
C Larynx
D Mouth

Answer: Larynx
80 Project Tiger was launched on
A 1 april 1973
B 23 may 1973
C 21 September 1973
D 25 December 1973

Answer: 1 april 1973
81 The places where animals receive protection is called
A Zoo
B National aparks
C Rock shelters
D None of these

Answer: Zoo
82 Fauna indicates for
A Plants
B Animals
C Both plants and animals
D None of these

Answer: Both plants and animals
83 The growing more and more of plants is called
A Deforestation
B Afforestation
C Reforestation
D None of these

Answer: Afforestation
84 The species which are at the verge of the extinction
A Endemic
B Extinct
C Endangered
D None of these

Answer: Endangered
85 The hearing range of human ear is
A 20 Hz to 20,000 Hz
B Less than20 Hz
C More than 20,000 Hz
D 20 Hz to 25,000 Hz

Answer: 20 Hz to 20,000 Hz
86 Puberty age in females is
A 10-12
B 8-10
C 12-14
D More than 14 years

Answer: 10-12
87 Fertilisation is called
A To produce sperm
B To produce eggs
C Fusion of sperms and eggs
D All of these

Answer: Fusion of sperms and eggs
88 The period of maturity of reproductive organs is called.
A Adolescene period
B Mensuration
C Gestation period
D None of these

Answer: Adolescene period
89 Lightening occurs due to
A Electric discharge
B Rain
C Wind
D Lord Varun?s anger

Answer: Electric discharge
90 The shaking of earth is called
A Tsunami
B Volcano
C Earthquake
D All of these

Answer: Earthquake
91 The like charges
A Repel each other
B Attract each other
C No interaction takes place
D All of these

Answer: Repel each other
92 Name the resin which produces spark is
A Gum
B Amber
C Both A and B
D None of these

Answer: Amber
93 An electric lamp glows due to
A Chemical effect
B Magnetic effect
C Heating effect
D None

Answer: Heating effect
94 Air pollution causes
A Global warming
B Respiratory problems
C Soil erosion
D None of these

Answer: Respiratory problems
95 Most polluted river in the world is
A Yamuna
B Cavery
C Chenab
D Ganga

Answer: Ganga
96 The Taj Mahal is being affected by
A Noise pollution
B Air pollution
C Water pollution
D None of these

Answer: Air pollution
97 Highest percentage of air consists of
A Oxygen
B Carbon dioxide
C Nitrogen
D Argon

Answer: Nitrogen
98 What is the gap between the orbit of mars and Jupiter called?
A Asteroids
B Comets
C Meteor
D Meteorite

Answer: Asteroids
99 Which is the largest planet in solar system?
A Mercury
B Mars
C Jupiter
D Saturn

Answer: Jupiter
100 The first outside orbit of the earth planet is
A Jupiter
B Mars
C Saturn
D Uranus

Answer: Mars