CBSE Class 8 Science MCQs Bank Set C

Multiple Choice Questions  

 Chapter 1

Crop Production and Management

Question. The Crops which are grown in rainy season are called 

a) Rabi crop

b) Seasonal crop

c) Monsoon crop

d) Kharif crop

Question. Rabi Crops are grown in _______ season 

a) Summer

b) Spring

c) Winter

d) rainy

Question. Now a days seed is sown in the field using 

a) Seed Tractor

b) Seed drill

c) Seed Tiller

d) Seed Plough

Question. Which of the following description is true for describing ‘fertiliser’ 

a) Used in large quantity

b) Organic in nature

c) Does not cause pollution

d) Produced in factories

Question. Rhizobium (a Bacteria) which fixes atmospheric nitrogen are found in nodules growing in 

a) Roots of leguminous plants

b) Leaves of leguminous plants

c) Stem of Leguminous plants

d) All of the above.

Question. Before sowing the seeds, it is necessary to break soil to the size of grains to get better yield. The main tools used for such are 

a) Tractor, Hoe, Seed drill

b) Bullock, tiller, tractor

c) Plough, Hoe, Cultivator

d) Plough, Seed Drill, Tractor

Question. Growing different crops alternately on the same land is technically called

a) Crop Alternation

b) Crop Rotation

c) Crop Revolution

d) Crop Change

Question. Moat, Dhekli and Rahat are different

a) Traditional methods of cultivation

b) Traditional methods of Weeding

c) Traditional methods of Seed sowing

d) Traditional methods of irrigation

Question. In the harvested crop the grain seed is separated from the chaff. This process id called ___ 

a) Threshing

b) Seeding

c) Ploughing

d) Weeding

Question. The farm appliance ‘Combine’ is a combined

a) Plough and Harvester

b) Seed drill cum Thresher

c) Harvester and Thresher

d) Harvester cum Sprayer 

 Chapter 2

Microorganisms: Friend or Foe

Question. Diseases like polio and chicken pox are caused by _______ 

a) Bacteria

b) Fungi

c) Virus

d) Worms

Question. Examples of Multicellular Microorganism are 

a) Algae, Bacteria

b) Bacteria and Fungi

c) Bacteria and Viruses

d) Algae and Fungi

Question. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.

a) Antibodies

b) Antibiotics

c) Antiseptics

d) All of the above

Question. A common preservative used in jam and pickles is

a) Sodium benzoate

b) Nitric acid

c) Sodium Chloride

d) Copper Sulphate

Question. Rhizobium found in root nodules of leguminous roots is an

a) Atmospheric Carbon fixer

b) Atmospheric Oxygen fixer

c) Atmospheric Nitrogen fixer

d) All of the above

Question. Lactobacillus is commonly found in

a) Cake

b) Curd

c) Bread

d) All of the above

Question. The process of conversion of sugar into alcohol by yeast is called

a) Fermentation

b) Pasteurisation

c) Alcoholism

d) All of the above

Question. . The pores in the bread is due to gas bubbles of

a) Oxygen

b) Nitrogen di oxide

c) Nitrogen

d) Carbon di oxide

Question. Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

a) Medication

b) Antibiotics

c) Vaccination

d) All of the above

Question. The microbe for Malaria is carried by

a) Male Anopheles mosquito

b) Female Anopheles Mosquito

c) Male Aedes mosquito

d) Female Aedes mosquito 

Chapter 3

Synthetic Fibres and Plastics

Question. A chain of small chemical units combined to form a large single unit is called ____

a) Polymer

b) Poly

c) Polythene

d) None of the above

Question. Polythene and PVC are examples of

a) Bio degradable substance

b) Thermosetting plastics

c) Thermoplastics

d) Rayon

Question. Plastics which when moulded once, cannot be softened by heating. Such plastics are called ____

a) Polythene

b) Thermoplastics

c) Polyster

d) Thermosetting plastics

Question. Polycot is made by mixing two types of fibres namely

a) Silk + Cotton

b) Polythene + cotton

c) Silk + Polyester

d) Polyester + Cotton

Question. The 4 R Principle is

a) Reduce, Reuse, Recycle, Recover

b) Remember, reduce, Recycle, Rejoice

c) Repeat, Rejoice, recycle, reduce

d) None of the above

Question. _____________ is an example of natural polymer

a) Rayon

b) Cellulose

c) Nylon

d) All of the above

Question. Which of the following is Non-biodegradable

a) Woolen clothes

b) Plastic bag,

c) Cotton cloth

d) Wood

Question. Bakelite and Melamine are examples of

a) Thermosetting plastics

b) Silk

c) Nylon

d) Rayon

Question. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant.

a) Nylon

b) Rayon

c) Melamine plastic

d) Silk

Question. The coating on modern non- stick cookware and electric iron is of

a) Terrycot

b) Rayon

c) Polyester

d) Teflon

Chapter 4

MATERIALS : METALS AND NON-METALS

Question. The property of metals by which they can be beaten into thin sheets is called ____

a) Ductility

b) Sheetability

c) Metallic

d) Malleability

Question. The property of metal by which it can be drawn into wires is called ______

a) Ductility

b) Sheetability

c) Metallic

d) Malleability

Question. The metal found in liquid state is

a) Iron

b) Aluminium

c) Mercury

d) Gold

Question. When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of

a) Copper oxide and Copper Nitrate

b) Copper hydroxide & Copper Carbonate

c) Copper carbonate and Copper sulphate

d) Copper hydroxide and Copper Nitrate

Question. When sulphur dioxide is dissolved in water __________ is formed.

a) Sulphuric acid

b) Sulphoxy acid

c) Sulphurous acid

d) Sulphur trioxide

Question. Sodium metal is stored in

a) water

b) Kept under open air

c) alcohol

d) Kerosene

Question. Phosphorus is stored in

a) water

b) Kept under open air

c) alcohol

d) Kerosene

Question. Since metals produce ringing sounds, they are said to be ____.

a) Sound metal

b) Sonorous

c) Ring metal

d) malleable

Question. A substance which cannot be broken down further by chemical reactions, by cooling, heating, or by electrolysis, is called ______

a) Metal

b) Non Metal

c) Element

d) Compound

Question. They are not sonorous and are poor conductors of heat and electricity. These materials are

a) elements

b) Metals

c) Compound

d) Non metals

Chapter 5

COAL AND PETROLEUM

Question. Resources present in unlimited quantity in nature and are not likely to be exhausted by human activities are called

a) Exhaustible Natural Resources

b) Inexhaustible Natural Resources

c) Exhaustible Resources

d) None of the above

Question. Coal, Petroleum and natural gas are examples of

a) Exhaustible Natural Resources

b) Inexhaustible Natural Resources

c) Expensive Resources

d) None of the above

Question. Naphthalene balls used to repel moth and insect is derived from

a) Petroleum

b) Sugar

c) Coal tar

d) LPG

Question. CNG is the abbreviated form of

a) Combined natural gas

b) Compressed Natural Gas

c) Confirmed Natural gas

d) Condemned Natural gas

Question. The slow process of conversion of dead vegetation into coal is called

a) Carbonisation

b) fuelification

c) Coalification

d) None of the above

Question. In India petroleum deposit was first found in the state of

a) Gujarat

b) Maharastra

c) Assam

d) West Bengal

Question. Use of CNG in automobile is better than petrol because it is

a) cheaper

b) Less polluting

c) Cannot be adulterated

d) All of the above

Question. To reduce fuel consumption in automobile one should

a) Drive very fast to reach early

b) Not switch off the engine at traffic lights

c)  Not check tyre pressure regularly

d) Ensure proper maintenance of the vehicle

Question. Black gold is actually

a) Gold which became black on burning

b) Petroleum

c) Gold sold in black market

d) Diamond

Question. The earth’s temperature is increasing due to Global warming which is due to

a)  The Sun giving out more heat

b) The Earth slowly moving toward the sun

c) Increased use of fossil fuel

d)  Less duration of winter every year

Chapter 6

COMBUSTION AND FLAME

Question. A chemical process in which a substance reacts with oxygen to give off heat is called

a) Conduction

b) Conjunction

c) Combustion

d) Confusion

Question. Fuel may be

a) Solid only

b) Solid,Liquid or gas

c) Liquid only

d) Gas only

Question. The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.

a) 1 litre

b) 1 Kg

c) 1 milli litre

d) 1 gram

Question. The substances which have very low ignition temperature and can easily catch fire with a flame are called

a) Inflammable substances

b) Flaming substance

c) Fire proof substance

d) None of the above

Question.  When we heat water in a paper bowl over a candle, the paper does not catch fire because

a) Paper is not inflamable

b) Paper gets wet

c) Due to water the ignition temperature of paper is not reached

d) This is not possible

Question. When oil or petrol catches fire, water is not used to extinguish it because

a) Water covers oil and oil burns under water layer which may not be noticeable

b) Water is heavier than oil / petrol and so remains below the oil layer which continues to burn

c) Water get mixed with oil and increases fire

d) Water gets evaporated

Question. In combustion

a) Both heat and light is produced

b) Only heat is produced

c) Only light is produced

d) All are correct

Question. A person caught fire on clothes is wrapped with blanket because

a) The person suddenly feels cold

b) To hide the burnt body parts

c) The person’s clothes gets burnt

d) To reduce air supply and put fire off

Question. Ignition temperature is

a) The maximum temperature at which a substance catches fire

b) The minimum temperature at which a substance catches fire

c) The temperature of burning substance

d) The temperature in the substance when fire if put off

Question. Explosion takes place because of

a) Release of large amount of gas under pressure due to sudden reaction

b) Release of large amount of heat

c) Release of large amount of light                                             

d) None of the above 

Chapter 7

CONSERVATION OF PLANTS AND ANIMALS

Question. Deforestation means

a) Planting more trees

b) Designing a forest

c) Demanding a forest

d) Clearing of forests and using that land for other purposes.

Question. Ill effect of deforestation is it

a) Increases temperature of earth

b) Increases pollution level

c) Increases CO₂ level of atmosphere

d) All of the above

Question. Increased level of carbon dioxide in the atmosphere traps the heat rays reflected by the earth causing an increase in the temperature on the earth. This is

a) Local warming

b) House warming

c) Global warming

d) Country warming

Question. Part of the earth which supports life where living beings exists is called ____

a) Atmosphere

b) Biosphere

c) Biology

d) Biodiversity

Question. Variety of organisms existing on the earth, their interrelationships and their relationship with the environment is called

a) Diversity

b) Biosphere

c) Biology

d) Biodiversity

Question. Species of plants and animals which are found exclusively in a particular area are called

a) Endemic species

b) Exotic species

c) Local species

d) Specific species

Question. Animals whose numbers are reducing to a level that they might face extinction are

a) Reducing species

b) Extinction species

c) Endangered species

d) Dangerous species

Question. ____ is the Source book which keeps a record of all the endangered animals and plants.

a) Blue Data book

b) Red Data book

c) Green data book

d) Black data Book

Question. Migratory birds fly to far off places in a particular season of the year because that place becomes

a) Very cold

b) Very hot

c) People hunt birds

d) Birds donot

Question. Reforestation means

a) Planting trees

b) restocking of the destroyed forests by planting new trees.

c) Cutting trees

d) Burning trees

Chapter 8

CELL- STRUCTURE AND FUNCTIONS

Question. Hen’s egg is

a) An organ

b) A Single cell

c) A tissue

d) Is none of the above

Question. Projections of different lengths protruding out of the body of Amoeba is called

a) Walking legs

b) Legs

c) Pseudopodia

d) Needle

Question. Which of the following cells can change its shape

a) White blood cell

b) Egg cell

c) Red blood cell

d) All of the above

Question. One millionth of a metre is

a) Millimetre

b) Micrometre

c) Nanometre

d) Centimetre

Question. Which of the following combinations are present in plant cell but not in animal cell

a) Cell Wall & Plastid

b) Cell wall and Cell membrane

c) Plastid and Nucleus

d) Cell Membrane and Cytoplasm

Question. Nucleus is separated from cytoplasm by

a) Protoplasm

b) Cell membrane

c) Cell Wall

d) Nuclear membrane

Question. Robert Hooke first observed

a) Nucleus

b) Cells

c) organs

d) virus

Question. A cell without organized nucleus is called

a) Prokaryotic cell

b) Eukaryotic cell

c) Virus

d) None of the above

Question. Jelly-like substance present between the cell membrane and the nucleus is

a) Water

b) Nucleoplasm

c) Cytoplasm

d) oil

Question. Chromosome carry _____ which transfers characters from parents to offsprings

a) Ribosome

b) Genes

c) Plastid

d) Mitochondria

Chapter 9

REPRODUCTION IN ANIMALS

Question. Human Male germ cell is

a) zygote

b) ovum

c) testis

d) sperm

Question. Every month ____ mature egg(s) can be released from human ovary

a) 1

b) 2

c) 3

d) 4

Question. Internal fertilization does not occur in

a) human

b) dog

c) fish

d) cow

Question. Fertilization results into formation of

a) egg

b) zygote

c) sperm

d) individual

Question. Which one is not an oviparous animal?

a) human

b) crow

c) hen

d) crocodile

Question. The transformation of the larva into an adult through drastic changes is called

a) Metaphase

b) Metastasis

c) Meteorite

d) Metamorphosis

Question. In asexual reproduction involves _______

a) Two parents

b) Four parents

c) One parent

d) No parents

Question. Dolly the famous animal was a

a) donkey

b) girl

c) Cloned sheep

d) Normal sheep

Question. During a cell division

a) Nucleus divides first and then cytoplasm

b) Cytoplasm divides first and then Nucleus

c) Nucleus and cytoplasm divides together

d) No such relationship

Question. Budding is found in

a) Yeast

b) Hydra and Yeast

c) Hydra

d) None

Chapter 10

REACHING THE AGE OF ADOLESCENCE

Question. The period of life, when the body undergoes changes, leading to reproductive maturity, is called

a) childhood

b) adolescence

c) Grown up

d) Old age

Question. The human body undergoes several changes during adolescence. These changes mark the onset of

a) Puberty

b) Prematurity

c) Post adolescence

d) ageing

Question. Adam’s apple is prominent in

a) Boys of any age

b) Adolescent girls

c) Girls of any age

d) Adolescent boys

Question. Larynx is also called

a) Voice box

b) Sound box

c) Black box

d) All of the above

Question. Acne and pimples on the face is due to secretion of

a) bile from liver

b) Oil glands during puberty

c) Enzymes in the digestive tract

d) Tear from tear glands

Question. Testosterone is a hormone found in human ___

a) Children

b) males and females

c) Females only

d) Males only

Question. The first menstrual flow is called

a) Menstruation

b) Mensuration

c) Menarche

d) Menopause

Question. Menopause occurs at the age of

a) 10-12 years in boys

b) 45-50 years in men

c) 10-12 years in girls

d) 45-50 years in women

Question. When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a _____ child

a) Female

b) Either a male or female

c) Male

d) No child

Question. The change from larvae to adult is called

a) Metabolism

b) Metamorphosis

c) Metastasis

d) Morphology

Chapter 11

FORCE AND PRESSURE

Question. A push or pull on an object is called

a) Pressure

b) Push-pull

c) Force

d) All of the above

Question. If two forces act in the opposite directions on an object, the net force acting on it is the

a) Sum of the two forces

b) difference between the two forces

c) Multiplication of the two forces

d) Division of the two forces

Question. Which of the following is proper example(s) to explain that force on an object may change its shape

a) A ball of dough rolled into chapati

b) Pressing a rubber ball kept on table

c) Making model using clay

d) All of the above

Question. A ball rolling on the ground slows down and finally stops. This is because of

a) Force

b) Less force applied

c) Friction

d) None of the above

Question. Force of friction always acts on moving objects and its direction shall be ____

a)  On any direction

b)  Along the direction of motion

c)  Perpendicular to the direction of motion

d)  Opposite to the direction of motion

Question. If In a tug-o-war, when two teams are pulling a rope, and the rope does not move towards any team, it implies that

a) Equal force is being applied in the same direction

b) Equal Force is being applied in opposite direction

c)  No force is applied in any direction

d)  Cannot be explained

Question. An example of a non- contact force is

a) Force exerted by us to lift a bucket

b) Push a stationary car

c) Force exerted by magnet

d)  Hit a cricket ball for a 6 run

Question. Pressure =

a) Area / force on which it acts

b) force / area on which it acts

c) Volume / force on which it acts

d) Force / volume on which it acts

Question. Gravity is

a) Repulsive

b) Attraction + Repulsive force

c) Attractive force

d) Not a force

Question. A batsman hits the ball for a boundary past the bowler i.e. four runs. The batsman thus

a) Changes the direction & speed of the ball

b) Does not change the direction but speed only

c) Does not change the speed but direction only

d) Does not change either direction or speed

Chapter 12

FRICTION

Question. It is difficult to walk on an oily floor because

a) Floor gets spoiled

b) There is more resistance

c) Force of friction is high

d) Force of friction is very less

Question. Spring balance is a device used for measuring the _____________ acting on an object.

a) mass

b) pressure

c) force

d) None of the above

Question. A matchstick struck on a matchbox catches fire easily because

a) Friction may cause fire

b) Of chemical reaction

c) Force heated the match stick

d) None of the above

Question. Tyres are treaded to

a) look good

b) Increase friction

c) increase its longivity

d) increase weight of the tyre

Question. Lubricants are substances which

a) Increase friction

b) Are used to light fire

c) Reduce friction

d) Are used to put out a fire

Question. Sliding friction is _________ than / to rolling friction

a) smaller

b) greater

c) equal

d) None of the above

Question. The frictional force exerted by fluids is also called ______

a) drug

b) drag

c) drop

d) drown

Question. Four children were asked to arrange forces due to rolling, static and sliding frictions in an increasing order. Their arrangements are given below. Choose the correct arrangement.

a) Rolling, Static, Sliding

b) Static, Rolling, Sliding

c) Rolling, sliding, static

d) Sliding, Static, Rolling

Question. A boat or an aeroplane has a pointed or tapering front / head. Why?

a) To increase the friction of fluid

b) To reduce the friction of fluid

c) To look good

d) For no reason

Question. The sole of the shoes becomes plain after wearing it for several months. The reason is

a) Wearing out due to friction

b) Wearing out due to no friction

c) Sole is of bad quality

d) None of the above

Chapter 13

SOUND

Question. Sound is produced by

a) Non-Vibrating objects only

b) Vibrating and non- vibrating objects

c) Vibration has no relation to sound

d) Vibrating objects only

Question. Sound cannot travel through

a) vacuum

b) air

c) water

d) solids

Question. Vibration is also known as

a) Vibratory motion

b) Translatory motion

c) Oscillatory motion

d)  None of these

Question. Frequency is expressed in

a) Kilometer

b) Hertz

c) gram

d) Degree centigrade

Question. The number of oscillations per second is called

a) Amplitude of oscillation

b) Pitch of oscillation

c) Frequency of oscillation

d) None of the above

Question. Above _____ dB the sound becomes physically painful

a) 60

b) 40

c) 120

d) 80

Question. When the amplitude of vibration is large, sound produced is

a)  No sound

b) feeble

c) loud

d) No relation between amplitude and sound

Question. Human can hear sound in the range of

a) 200-2000 Hz

b) 20-20,000 Hz

c)  2-20000 Hz

d) 2000-200000 Hz

Question. An ultrasound equipment works at frequency

a) Higher than 20,000 Hz

b) Higher than 10,000 Hz

c) Lower than 20,000 Hz

d) Lower than 10,000 Hz

Question. Voice of man is heavy compared to a woman because

a) Female vocal cord is longer

b) Male vocal cord is shorter

c) Male vocal cord is longer

d) The concept is not related

Chapter 14

CHEMICAL EFFECT OF ELECTRIC CURRENT

Question. In LEDs, the longer lead (wire) is always connected to the _______ terminal

a) negative

b) neutral

c) positive

d) Any terminal

Question. Tap water is a good conductor of electricity while distilled water is not because

a) Tap water contain salts

b) Distilled water do not contain salt

c) Only a) is correct

d) Both a & b is correct

Question. When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _______ gas.

a) Hydrogen

b) Carbon di oxide

c) Oxygen

d) Nitrogen

Question. When electrodes are immersed in water and electricity passed, the bubbles formed on the negative terminal is actually _______ gas.

a) Hydrogen

b) Carbon di oxide

c) Oxygen

d) Nitrogen

Question. 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

Question. A coating of _________is deposited on iron to protect it from corrosion and formation of rust

a) copper

b) aluminium

c) Zinc

d) silver

Question. Chromium plating is done on many objects such as car parts, bath taps, kitchen gas stove etc. Why?

a) It does not corrode but prevents scratches

b) It looks beautiful

c) It costs less

d) Articles can be sold at higher price

Question. The process of depositing a layer of any desired metal on another material by means of electricity is called ___________.

a) Electric plating

b) Electroplating

c) Electric depositing

d) None of the above

Question. Some liquids are good conductors of electricity and some are poor conductors. Which one is a poor conductor?

a) Acidic solution

b) Alkaline solution

c) Common Salt solution

d) Distilled water

Question. Tin cans, used for storing food, are made by electroplating tin onto iron. Why?

a) Tin gives a shiny appearance

b) To make the vessel cheap

c) Tin is less reactive than iron.

d) To make the vessel lighter

Chapter 15

SOME NATURAL PHENOMENA

Question. It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as __________

a) Negative

b) Positive

c) Neutral

d) Can be any one

Question. A device used to test whether an object is carrying charge or not is called ______.

a) Electrometer

b) Charge meter

c) Electroscope

d) Chargoscope

Question. During lightning actually _____________ takes place

a) Electric discharge

b) Electric charging

c) Electric charge accumulation

d) All of the above

Question. During a thunderstorm which action may be done?

a) Using Telephone having cord

b) Switching on / off electric lights

c) Using a mobile phone

d) None of the above

Question. To protect tall buildings from the damage of lightning, what can be done?

a)  Not to build tall buildings

b)  Install lightning conductors

c)  Install many TV antennas

d)  Have a roof top garden with tall trees

Question. A major earthquake occurred on 26th January 2001 in which part of India?

a) Uri (Kashmir)

b) Mumbai (Maharastra)

c) Guwahati (Assam)

d) Bhuj (Gujarat)

Question. During thunderstorm it is safer to

a) Carry an open umbrella

b) Take shelter under short trees

c) Take shelter under tall trees

d) Stand in open fields

Question. The process of transferring charge from a charged body to earth is called

a) transferring

b) Processing

c) Charging

d) Earthing

Question. Seismograph is an instrument used to

a) Record strength of wind

b)  Record vibrations of earthquake

c)  Record lightening

d) Record temperature

Question. The power of an earthquake is expressed in terms of magnitude on a scale called

a) Righter Scale

b) Quake scale

c) Richter Scale

d) Earth Scale

Chapter 16

LIGHT

Question. If the angle of incidence of light falling on a plane mirror is 30degree, what will be the angle of reflection?

a) 90 degree

b) 60 degree

c) 30 degree

d) 0 degree

Question. When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called

a) Left-right confusion

b) Lateral inversion

c) Up -side down phenomenon

d) mirage

Question. Light passing through a prism splits into seven colours. This is called

a) Dispersion

b) Dissolution

c) Division

d) None of the above

Question. Rainbow is a natural phenomenon showing

a) Reflection

b) Deflection

c) Dispersion

d) Diversion

Question. In the retina of the eye, the area having no sensory cells is called

a) iris

b) Blind spot

c) cornea

d) Dark spot

Question. If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected?

a) 45 degrees

b) 90 degrees

c) 180 degrees

d) 360 degrees

7  Which of the following is not a luminous object?

a) sun

b) candle

c) moon

d) Tube light

8  To make a kaleidoscope we require

a) Three plane mirrors

b) Four plane mirrors

c) Three glass sheets

d) Four glass sheets

9  In our eye _______cells can sense colour

a) Rod

b) Cone

c) Both rod and cone

d) Neither rod nor cone

10  An owl can see clearly at night but not day time because it has

a) More rods and few cones

b) Less rod and more cones

c) More rods and more cone

d) Less rods and less cones

Chapter 17

STARS AND SOLAR SYSTEM

1 If I am 13 years old, I have gone round the sun ___ times.

a) Never gone round the sun

b) 13

c) 26

d) Shall go round the sun when I shall be 15

2  The least dense planet is

a) Earth

b) Jupiter

c) Saturn

d) Uranus

3 ____ appears as a bright head with a long tail. The tail grows in size as it approaches the sun.

a) Asteroid

b) Comet

c) Planet

d) Meteor

4 During a clear night sky, bright light streaks are often visible. They are called shooting stars. They are actually

a) Falling stars

b) Comet

c) Meteors

d) Planet

5 _____ was the first Indian satellite.

a) INSAT

b) EDUSAT

c) IRS

d) Aryabhatta

6 If Saturn is thrown into an ocean,

a) It will float

b) It will sink

c) It will dissolve

d) It will soak all water

7 It is difficult to observe Mars because

a) It is the smallest planet of this universe

b) It is too far away from our planet

c) It is hidden by the glare of the sun

d) None of the above

8 Ravi was looking for Venus in the sky at midnight. Mohan laughed at him because Venus

a) Appears 1-3 hours after sunrise or 1-3 hours after sunset

b) Appears 1-3 hours before sunrise or 1-3 hours after sunset

c) Appears 1-3 hours before sunrise or 1-3 hours before sunset

d) Appears 1-3 hours after sunrise or 1-3 hours before sunset

9 Earlier we had 9 planets in our solar system of which one name has been eliminated as per IAU (2006). The planet is

a) Uranus

b) Neptune

c) Pluto

d) Earth

10 Light Year is

a) Year full of light

b) Year having light work

c) Year which earth shall become lighter

d) Distance travelled by light in 1 year

Chapter 18

POLLUTION OF AIR AND WATER

1 Carbon monoxide in vehicle exhaust causes

a) Increased oxygen carrying capacity of RBCs

b) Reduced Nitrogen carrying capacity of RBCs

c) Reduced oxygen carrying capacity of RBCs

d) Reduced carbon carrying capacity of RBCs

2  Smog =

a) Smoke in dog’s stomach

b) Smoke + fog

c) Smoke dog

d) frog in fog

3 The gas used in refrigerating appliance causing serious damage to ozone is

a) MFCs

b) CFCs

c) LPCs

d) DPCs

4  Acid rain mainly contains

a) Sodium chloride

b) Sulphur di oxide and Nitrogen di oxide

c) Hydrochloric acid

d) Carbon tetra chloride

5  Marble cancer is caused by

a) bacteria

b) virus

c) Acid rain

d) Alkali rain

6 Greenhouse effect is

a) Painting house green in colour

b) Wearing green colour dress

c) Having green room in the house

d) Sun’s heat is trapped and not allowed to escape

7 Greenhouse gases includes

a) CO₂, Methane, Nitrous oxide

b) CO₂, Argon, Nitrous oxide

c) CO₂, Methane, Chlorine

d) CO₂, Methane, Flourine

8 _____ is a commonly used chemical method for purifying water.

a) Brominization

b) Flourination

c) Filtration

d) Chlorination

9  Ganga Action Plan is associated with

a) Increase of fish culture in the Ganges

b) Reduce Ganga water pollution

c) Construct more bridges over the Ganges

d) Increase water transport on the Ganges

10 Van Mahotsav is

a) Planting trees in January

b) Cutting trees in January

c) Cutting trees in July

d) Planting trees in July