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STD 7 Science Practice Quizizz

Total questions: 204

Worksheet time: 2hrs 44mins

Name
Class
Date
1.
What is the common name for Horizon A?
a)
bedrock
b)
topsoil
c)
parent material
d)
subsoil
2.
What is humus?
a)
organic material rich in nutrients
b)
subsoil
c)
parent material
d)
trees
3.
Why is soil an important natural resource?
a)
soil is used to make buildings
b)
soil can grow crops
c)
soil comes from bedrock
d)
soil is full of mircobes
4.
Subsoil is made mostly of
a)
parent material
b)
humus
c)
clay and silt
d)
bedrock
5.
What is the main purpose of microbes in the soil?
a)
to release the nutrients in rocks
b)
to cause disease
c)
to feed animals
6.
Which describes the soil layers in order from the surface?
a)
top soil, bedrock, horizon C, subsoil
b)
top soil, subsoil, horizon C, bedrock
c)
top soil, horizon C, subsoil, bedrock
7.
Why are good conservation practices important for lumber companies to follow?
a)
It adds groundwater
b)
it increases soil erosion
c)
it decreases soil erosion
d)
the soil is shaded
8.
Which of these slows down soil erosion on construction sites?
a)
clear cutting
b)
strip mining
c)
contour plowing
d)
sandbags and nylon fencing
9.
Two methods of soil conservation in farming are
a)
reclamation and subsurface mining
b)
landscaping and nylon fencing
c)
selective harvesting and replanting
d)
contour plowing and windbreaks
10.
What type of erosion is slowed down by contour plowing and terracing?
a)
wind
b)
water
c)
air
11.
Which of the following soil types would contain the most nutrients?
a)
Soil with many large rock particles
b)
Soil with bedrock close to the surface
c)
soil that drains well through it
d)
soil with decomposed organic material
12.
What is a solution to stop wind erosion on a farmer's field?
a)
Plow up all of the plants
b)
Build a pond
c)
plant trees and shrubs on the edge
13.
What process breaks down bedrock to begin soil formation?
a)
leaching
b)
weathering
c)
decomposition
d)
humus
14.
What process breaks down bedrock to begin soil formation?
a)
leaching
b)
weathering
c)
decomposition
d)
humus
15.
Which organ excretes carbon dioxide?
a)
Lungs
b)
Liver
c)
Heart
d)
Kidney
16.
What is the organ "x"
a)
Heart
b)
Lungs
c)
Diaphragm
d)
Trachea
17.

What are the products of aerobic respiration?

a)

Carbon Dioxide and Energy

b)

Lactic Acid

c)

Water and Carbon Dioxide

d)

Glycogen and Carbon Dioxide

18.

What are the products of anaerobic respiration in a human cell?

a)

Energy and Lactic Acid

b)

Lactic Acid

c)

Lactic Acid and Carbon Dioxide

d)

Carbon Dioxide and Water

19.

What is the chemical formula for glucose?

a)

C6H12O6

b)

C12H6O12

c)

C6O12H6

d)

6CH2O

20.

Where in the body does respiration take place? Select the best answer.

a)

The lungs

b)

The muscles

c)

All cells

d)

The blood

21.

Which of these is a product of cellular respiration?

a)

ATP

b)

Carbon dioxide

c)

Water

d)

All of these are a product of cellular respiration

22.

The respiratory system works with the ________ to help with Cellular Respiration

a)

Nervous system

b)

Circulatory System

c)

Muscular System

d)

Endocrine System

23.

Lungs are present in the

a)

Chest Cavity

b)

Nasal cavity

c)

Respiration

d)

Diaphragm

24.

What is cellular respiration?

a)

The breakdown of glucose to release ATP

b)

The breakdown of glucose to release NADH

c)

The breakdown of glucose to release FADH

d)

The breakdown of glucose to release carbon

25.

When we inhale air, it passes through our nostrils into the

a)

Nasal cavity

b)

Chest cavity

c)

Tracheae

d)

Spiracles

26.

Earthworms skin is

a)

Moist and slimy

b)

Moist and rough

c)

Rough and slippery

d)

Rough and slimy

27.

Small openings on the side of the cockroaches body is called as

a)

Trachea

b)

Spiracles

c)

Glucose

d)

None

28.

During inhalation diaphragm moves

a)

Down

b)

Left

c)

Right

d)

Up

29.

Yeast is a

a)

Multicellular

b)

Carnivore

c)

Anaerobe

d)

Single-celled organism

30.
Platelets 
a)
allow for gases to exchange
b)
give blood its color
c)
fight infection and disease
d)
help clot blood
31.
The smallest type of blood vessel is the:
a)
nerve
b)
vein
c)
capillary
d)
artery
32.

Recall that the movement of food in the phloem is called.

a)

Translocation

b)

Transpiration stream

c)

Evaporation

d)

Respiration

33.

Type of device that records the electrical signal from your heart to check for different heart conditions.?

a)

AED

b)

MRI

c)

ECG

d)

CAT Scan

34.
What is the largest artery in the human body called?
a)
Superior Vena Cava
b)
Aorta
c)
Inferior Vena Cava
d)
Pulmonary Artery
35.

Which of the following indicates the pathway of water through a plant?

a)

root hair cell --> xylem --> stomata

b)

stomata --> root hair cell --> xylem

c)

xylem --> stomata --> root hair cell

36.
Vascular tissue that transports water and minerals UPWARDS from a plant's roots is know as ______.
a)
Chlorophyll
b)
Phloem
c)
Stomata
d)
Xylem
37.
Transpiration is
a)
the movement of water through a plant from the roots up the stem
b)
the loss of water from the leaves of a plant by the process of evaporation
c)
the flow of water into plant roots by osmosis from the soil
d)
the process of minerals and sugars moving through plant veins
38.
This is the definition for which word:The movement of water molecules from a high concentration of water to a low concentration of water across a partially permeable membrane.
a)
Osmosis
b)
Diffusion
c)
Active transport
d)
Transpiration
39.
Which of these is true?
a)
Xylem vessels carry water and dissolved minerals up the plant
b)
Phloem tissue carry water and dissolved minerals up the plant
c)
Xylem vessels carry dissolved sucrose up and down the plant
40.

What is the size of a heart?

a)

Closed fist

b)

Hand

c)

Open hand

d)

Closed hand

41.

Which of the following is the main circulatory fluid in our body ?

a)

Plasma

b)

Lymph

c)

Blood

d)

None of these

42.

Why is color of blood red?

a)

myoglobin

b)

globulin

c)

heamoglobin

d)

fibrinogen

43.

What is the function of white blood cells?

a)

transport oxygen

b)

fight against infection

c)

clotting

d)

all the above

44.

The blood vessel which carries blood to the heart

a)

lymphatic vessel

b)

capillaries

c)

veins

d)

arteries

45.

Instrument used to measure the heart beat

a)

Endoscope

b)

Kaleidoscope

c)

Microscope

d)

Stethoscope

46.

Pulmonary artery carries what type of blood

a)

Oxygenated

b)

mixed

c)

pure blood

d)

Deoxygenated

47.

Phloem helps in the transport of

a)

Food

b)

water

c)

Food and Water

d)

Oxygen

48.

Human heart has -----------chambers

a)

3

b)

2

c)

4

d)

1

49.

Aorta carries oxygenated blood to all parts of the body

a)

True

b)

False

c)

No, pulmonary artery

d)

No, pulmonary vein

50.

Xylem transports

a)

Food

b)

Food and water

c)

Water and minerals

d)

Food, water and minerals

51.

Vegetative propagation in potato takes place by

a)

leaves

b)

stem

c)

root

d)

seed

52.

In …………………. reproduction, one individual can produce many individuals from its body parts.

(a)  

53.

Two individuals are needed for a sexual reproduction.

a)

True

b)

False

54.

In which of the following plants buds are present on the margins of leaves?

a)

Touch me not

b)

Chandan

c)

Bryophyllum

d)

Coriander

55.

Both stamen and carpel are present in …………………. flowers.

(a)  

56.

Seed is the only structure which develops into new plant.

a)

True

b)

False

57.

In yeasts reproduction occurs by

a)

fragmentation

b)

binary fission

c)

budding

d)

spore formation

58.

Budding is a type of …………………. reproduction.

(a)  

59.

Plants such as cacti produce new plants when their parts get detached from the main plant body.

a)

True

b)

False

60.

Which of the following parts of a plant take part in sexual reproduction?

(i) Flower (ii) Seed (iii) Fruit (iv) Branch

a)

(i) and (ii)

b)

(i), (ii) and (iii)

c)

(iii) and (iv)

d)

(ii), (iii) and (iv)

61.

The process of …………………. ensures continuity of life on the earth.

(a)  

62.

Plants produced by vegetative propagation take less time to grow and bear flower and fruit.

a)

True

b)

False

63.

Lila observed that a pond with clear water was covered up with a green algae within a week. By which method of reproduction did the algae spread so rapidly ?

a)

Budding

b)

Sexual reproduction

c)

Fragmentation

d)

Pollination

64.

…………………. are the reproductive parts of a plant.

(a)  

65.

The spores are asexual reproductive bodies.

a)

True

b)

False

66.

Seeds of drumstick and maple are carried to long distances by wind because they possess

a)

large and hairy seeds

b)

long and ridged fruits long and ridged fruits

c)

spiny seeds

d)

winged seeds

67.

Buds in potato are also called ………………….

(a)  

68.

Anther contains female gametes called eggs.

a)

True

b)

False

69.

The ‘eye of the potato plant is what

a)

the root is to any plant

b)

the bud is to a flower

c)

the bud is to Bryophyllum leaf

d)

the anther is to stamen

70.

Plants produce seeds as a result of …………………. reproduction.

(a)  

71.

The fruit is ripened ovary.

a)

True

b)

False

72.

The ovaries of different flowers may contain

a)

only one ovule

b)

many ovules

c)

one to many ovules

d)

only two ovules

73.

The small bulb like projection coming out from the yeast cell is called a ………………….

(a)  

74.

Seed dispersal in coconut is aided by winds.

a)

True

b)

False

75.

Which of the following statements is/are true for sexual reproduction in plants?

(i) Plants are obtained from seeds

(ii) Two plants are always essential

(iii) Fertilisation can occur only after pollination

(iv) Only insects are agents of pollination

Choose from the options given below:

a)

(i) and (ii)

b)

(i) only

c)

(i) and (ii)

d)

(i) and (iv)

76.

The …………………. develops into an embryo.

(a)  

77.

Fusion of male and female gametes is called pollination.

a)

True

b)

False

78.

Pollination refers to the:

a)

transfer of pollen from anther to ovary

b)

transfer of male gametes from anther to stigma

c)

transfer of pollen from anther to stigma

d)

transfer of pollen from anther to ovule

79.

The fruits are ripened ………………….

(a)  

80.

A bisexual flower has both male and female reproductive parts.

a)

True

b)

False

81.

The distance covered by an object in a ________ is called as the speed.

a)

Unit time

b)

Unit length

c)

Position

82.

If an object keeps changing it's speed, then the motion is _______ .

a)
b)
c)
83.

The time taken by the pendulum to complete ________ is called it's

time period .

a)

Ten oscillations

b)

One oscillation

c)

Five oscillations

84.

The basic unit of speed is__________.

a)

m/s

b)

m/hr

c)

km/hr

85.

Who invented the pendulum clocks?

a)

Galileo Galilie

b)

James Watt

c)

Albert Einstein

86.

Earlier time measuring instrument

a)
b)
c)
87.

_______ measures the speed and ________ measures the distance moved by the vehicle.

a)
b)
c)
88.

A simple pendulum consists of a _________ and thread suspended from a rigid stand.

a)
b)
c)
89.

To and fro motion of a simple pendulum

shows __________ .

a)
b)
c)
90.

The most appropriate unit for expressing the speed of a space rocket is:

a)

m/s

b)

km/s

c)

km/h

d)

km/min

91.

The instrument installed in a car for measuring the distance travelled by the car is called:

a)

barometer

b)

speedometer

c)

anemometer

d)

odometer

92.

The slope of a distance-time graph of a moving object indicates:

a)

distance moved by the object

b)

time taken by the object

c)

speed of the object

d)

position of the object

93.

The clocks and watches which are used for measuring time are based on :

a)

Rectilinear motion

b)

circular motion

c)

periodic motion

d)

rotational motion

94.

The distance moved by an object in a unit time is called

a)

Distance

b)

Displacement

c)

Time

d)

Speed

95.

The distance-time graph of vehicle moving with constant speed is a ________ line

a)

Curved

b)

horizontal

c)

straight

d)

parallel

96.

The to and fro motion of a simple pendulum is an example of _________ motion.

a)

Rectilinear

b)

curvilinear

c)

circular

d)

oscillatory

97.

A bus takes 30 minutes to travel a distance of 25 kilometers. The speed of the bus in km/h is :

a)

55 km/h

b)

50 km/h

c)

5 km/h

d)

75 km/min

98.

The movement seen in a giant wheel is an example of _____________ motion.

a)

Rectilinear

b)

Circular

99.

The above picture shows _____________ motion.

a)

Circular

b)

Rotational

c)

Rectilinear

100.

The formula to calculate distance is

a)

S x T

b)

T/S

c)

S/T

101.

A combination of two or more cells is called

a)

A button cell

b)

A battery

c)

An electric cell

d)

Truck battery

102.

Substances through which electric charges cannot move freely-

a)

Insulators

b)

Conductors

c)

Wood

d)

Plastic

103.

Which is true about a cell?

a)

Longer line represent-Positive terminal and Shorter line represents-Negative Terminal

b)

Longer line represent-Negative terminal and Shorter line represents-Positive Terminal

c)

Both line represent-Positive Terminal

d)

Both line represents-Negative Terminal

104.

Three bulbs A, B, C are connected in a circuit as shown in Figure, When the switch is ‘ON'

a)

bulb C will glow first.

b)

bulb B and C will glow simulaneously and bulb A will glow after some time.

c)

the bulbs will glow in the order A, B and C

d)

all the bulbs A,B and C will glow at the same time

105.

The heating effect of an electric current is used in

a)

Hair dryer

b)

A fan

c)

A computer

106.

Nichrome contains

a)

20% nickel 80% chromium

b)

80% nickel 20% chromium

c)

40 % chromium 60% zinc

107.

A fuse wire is a wire of-

a)

High resistivity and low melting point

b)

High resistivity and high melting point

c)

Low resistivity and low melting point

d)

Low resistivity and high melting point

108.

When current is switched 'on' of a bulb it converts _______ energy into _______ energy.

a)

Electrical, heat

b)

Electrical, light

c)

Electrical, mechanical

d)

Electrical, sound

109.

When current is switched on in an electric bell, it converts _______ energy into _______ energy.

a)

Electrical, light

b)

Electrical, sound

c)

Electrical, heat

d)

Mechanical, sound

110.

Connection of more than one device/ appliance to a single socket is called-

a)

Overloading

b)

Short circuit

c)

Both

111.

A common household device, that do not use an electromagnet in its working, is-

a)

The electric bell

b)

Geyser

c)

Telephone

d)

Loud speaker

112.

The filament of A bulb, is a wire of

a)

High resistivity, low melting point

b)

Low resistivity, low melting point

c)

High resistivity, high melting point

d)

Low resistivity, high melting point

113.

The heating coils/elements of different electrical appliances are usually made from ________ or ________ wires.

1. Copper 2. Aluminum 3. Nichrome 4. Tungsten

a)

1 & 2

b)

1 & 4

c)

2 & 4

d)

3 & 4

114.

When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes______ hot and start emitting _______.

a)

White, light

b)

Red, light

c)

White, heat

d)

Red, heat

115.

Which one of the following is the most energy efficient

a)

LED

b)

Incandescent bulb

c)

CFL

116.

Substances through which electric charges flow easily are called

a)

Wire

b)

Metal

c)

Conductors

d)

Insulators

117.

Full form of-CFL

a)

Compact Flood Light

b)

Common Full Light

c)

Compact Fluorescent Lamp

d)

Compact Flood Lamp

118.

WHo discovered the magnetic effect of current?

a)

Galileo Galilei

b)

Newton

c)

Marconi

d)

H C Oersted

119.

The given circuit is an example of __________ effect of electric current

a)

Magnetic effect

b)

Heating effect

c)

Chemical effect

120.

The instrument used to separate iron scrap from the junk yard that uses magnetic effect is

a)
b)
c)
121.

Magnetic effect of electric current was invented by

a)

Coulomb

b)

Oersted

c)

Joule

122.

When current is passed through a wire, it behaves like

a)

Conductor

b)

Magnet

c)

Insulator

123.

A current carrying conductor behaves like a magnet

a)

till the current is flowing throuhg it

b)

even though current is not passing

c)

none of the above

124.

Rajan made an electromagnet by winding 50 turns of the wire over an iron screw. Priya also made an electromagnet by winding 100 turns of the wire over an iron screw. which electromagnet will attract more pins?

a)

Rajan's Electromagnet

b)

Priya's Electromagnet

c)

Both attract same number of pins

125.

The magnetic strength of a conductor decreases with the increase in current

a)

True

b)

False

c)

None of the above

126.

It is important to use electrical appliances with _______ marks on it.

a)

ISI

b)

SIS

c)

SSS

d)

ASA

127.

The hammer is attatched to the __________ which in turn strikes the _________.

a)

Gong; Iron strip

b)

Iron Strip; Gong

c)

Electromagnet; Switch

d)

Switch; Iron Strip

128.

Q1. If in a circuit diagram containing a cell and nichrome wire tied between two nails, the cell is replaced by a battery then what will happen to the nichrome wire?

a)

A)It gets red hot slowly.

b)

B)No change in the temperature take place.

c)

C)It will get red hot quickly.

d)

D)The wire will break due to increase in strength of current.

129.

Q3. Which among the following are the advantages of heating effect of current?

a)

1.Can be used in electric fuse

b)

2.Increases the life of several appliances in the circuit.

c)

3.It helps in preventing loss of energy.

130.

Q5. Tungsten is used for the manufacture of an electric bulb because

a)

A)it is malleable

b)

B) it is inexpensive

c)

C) it has a very high melting point

d)

D) it is a good conductor

131.

Q10. Select the one that you will prefer to make an electromagnet.

a)

A) Steel

b)

B) Plastic

c)

C) Stainless steel

d)

D) Soft iron

132.

element of an electric iron is made up of

a)

nickel

b)

chromium

c)

nichrome

d)

tungsten

133.

A fuse wire is an alloy of ________ and _______ .

a)

Steel and copper

b)

iron and nickel

c)

lead and tin

d)

cobalt and iron

134.

Full form of MCB is ?

a)

Miniature Circuit Breaker

b)

Minute Circuit Builder

c)

Both of these

d)

None of these

135.

Which of the following cannot be an example for the use of electromagnets

a)

Electric Bell

b)

Doorbells

c)

Oven

d)

Phone

136.

When an electric current flows through a copper wire AB as shown in Figure, the wire:

a)

deflects a magnetic needle placed near it

b)

becomes red hot

c)

gives electric shock

d)

behaves like a fuse

137.

Why people prefer to put an MCB in their house instead of fuse nowadays- (Choose one or more options)

a)

They are cheap.

b)

Fuses need to be changed every time they blow out.

c)

MCBs can be controlled manually.

d)

Fuses are expensive.

138.

Electromagnets are not used to lift heavy loads.

a)

True

b)

False

139.

The magnitude of magnetism produced by an electric current in a wire depends upon- (a) Increases with an increase in the strength of electric current (b) Decreases, as the distance from the wire increases

a)

Both a, b

b)

Only a

c)

Only b

d)

None

140.

Connection of more than one device/ appliance to a single socket is called-

part of g.k

a)

Overloading

b)

Short circuit

c)

Both

141.

Which year was observed as International Year of Fresh Water?

a)

2003

b)

2006

c)

2008

d)

1990

142.

Which of the following does not show water shortage?

a)

Taps running dry

b)

Long queue for getting water

c)

Marches and protests for demand of water

d)

A family gets three buckets of water per person per day

143.

------------- pressure on agriculture forces increasing use of groundwater?

a)

Population

b)

industries

c)

all the above

144.

Which of the following does not allow water to seep in easily?

a)

graas

b)

mud

c)

pukka floor

d)

all the above

145.

Water is a what type of resource?

a)

renewable resource

b)

non-renewable resource

c)

continuous resource

146.

farmers in India depend upon ------- for irrigating their crops.

a)

soil

b)

seeds

c)

rain

d)

all the above

147.

Why is fresh water a limited resource?

a)

It isn't because it is a renewable resource

b)

97% of water is in the oceans and too salty to drink.

c)

Only 2.5% is drinkable and is stored in icecaps, rivers, and lakes.

148.
Where most freshwater is stored is in _________.
a)
Groundwater
b)
pH
c)
Glaciers
d)
Sea water
149.
Where 97% of Earth's water is stored?
a)
Glaciers
b)
pH
c)
Groundwater
d)
Sea water
150.

What is 1 in the image .(Click on the image to see the whole image )

a)

rainwater

b)

groundwater

c)

Hail

151.

MELTING POINT OF ICE

a)

18 DEGREE C

b)

0 DEGREE C

c)

-1 DEGREE C

d)

10 DEGREE C

152.

AMOUNT OF WATER COVERING EARTH

a)

97%

b)

74%

c)

71%

d)

68%

153.

CHANGING OF WATER VAPOUR INTO CLOUDS

a)

EVAPORATION

b)

CONDENSATION

c)

PRESIPITATION

154.

THREE FORMS OF WATER

(a)  

155.

We have seen that most of the water that we get as rainfall just flows away. This is a waste of precious natural resource. The rainwater can be used to recharge the groundwater. What is this process called ? Choose 2 answers

a)

Water saving

b)

Rainwater harvesting

c)

Rainwater saving

d)

Water Harvesting

156.

Which of the following is NOT a way water moves from the land to the air?

a)

transpiration

b)

respiration

c)

evaporation

d)

precipitation

157.
An underground layer of rock or sediment that holds water?
a)
Reservoir
b)
Aquifer
c)
Groundwater
d)
Watershed
158.

What is happening in the image ?

a)

Rainwater harvesting

b)

Drip irrigation

159.

EVAPORATION , CONDENSATION , PRECIPITATION ETC . ARE COMPRISED IN WHICH PROCESS ?

a)

GROUNDWATER CYCLE

b)

WATER CYCLE

c)

DRIP IRRIGATION

160.

The process of Water molecules turning into water vapour is called ___________?

a)

Condensation

b)

Precipitation

c)

Evaporation

d)

Irrigation

161.

Which is the quality of water waste?

a)

Dirty look

b)

Foul smell

c)

Mixed with lather

d)

All of these

162.

Which of the following is/are products of wastewater treatment?

a)

Biogas

b)

Sludge

c)

Both biogas and sludge

d)

Aerator

163.

Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

a)

Cholera

b)

Typhoid

c)

Asthma

d)

Dysentery

164.

Sewage treatment

a)

is a process of waste water treatment.

b)

refers to waste water that is released by homes, industries, hospitals etc.

c)

refers to the rain water that run down the streets during heavy rains.

d)

All of the above

165.

In the treatment of waste water, following steps are involved. (i) aeration (ii) removal of large objects (iii) chlorination The correct order of these steps is

a)

(i),(iii),(ii)

b)

(iii), (ii), (i)

c)

(i), (ii), (iii)

d)

(ii), (i), (iii)

166.

We should not throw cooking oil and paint down the drain because

a)

they break the pipe

b)

they harden and clog the pipe

c)

they flow through the drain freely

d)

None of these

167.

Which of the following is a good practice be followed?

a)

Cooking oil and paint should not be thrown down a drain.

b)

Used tea leaves, solid food and cotton should not be thrown in the drain.

c)

Chemicals like insecticides should not throw in the drain.

d)

All of the above

168.

Which process during waste water treatment helps in eliminating germs?

a)

Aeration

b)

Sedimentation

c)

Chlorination

d)

None of the above

169.

Dried _____ is used as manure

a)

slury

b)

sewage

c)

sand

d)

sludge

170.

In vermi-processing toilet the human excreta is treated by

a)

Redworm

b)

Tapeworm

c)

Earthworm

d)

Roundworm

171.

Which gas is released during treatment of sludge?

(a)  

172.

Large objects and garbage in the wastewater are removed by passing them through the (a)  

173.

Cleaning of water is a process of removing (a)   .

174.

Name the toilets used in areas with limited water supply.

(a)  

175.

Water which is cleared from the floatable substances like oil and grease by a skimmer is called

(a)  

176.

when is the world water day celebrated ?

a)

13 september

b)

2 october

c)

22 march

177.

cleaning of water is a process of removing contaminants from the wastewater, which is commonly known as -----------

(a)  

178.

The dirty water or the uncleaned water that comes from the houses, factories, offices etc.. is commonly known as ..

a)

blue water

b)

wastewater

c)

sewages

179.

organic impurities contain-

a)

human faeces , animal waste, oil, urea.

b)

nitrates, phosphorus, metals.

c)

vibro cholera

180.

the pipes which carry the dirty water are known as -

(a)  

181.

large objects like rugs, napkins, plastic bags are removed by using ?

a)

bar screens

b)

sludge

c)

aeration

182.

the grit and sand remover tank removes (a)  

183.

human excreta and urea are removed by

a)

sludge

b)

bar screen

c)

sea beds

184.

the skimmer removes oil and grease

a)

True

b)

False

185.

the anaerobic bacteria releases ozone gas

a)

TRUE

b)

FALSE

186.

air is pumped into the clarified water for the growth of aerobic bacteria

a)

TRUE

b)

FALSE

187.

name two chemicals used in wastewater treatment plant

(a)  

188.

the short form 'wastewater treatment plant' is

a)

WWTP

b)

WWWP

c)

WPWP

189.

the swatch bharat abhiyan was started in

a)

2014

b)

2015

c)

2017

d)

2016

190.

Water that has been used in the home, in a business, or as part of an industrial process and also which is unclean is called

(a)  

191.

When is World Water Day celebrated?

a)

May 22

b)

June 23

c)

March 22

d)

March 12

192.

Which of these create water pollution?

a)
b)
c)
193.

Which is the first process of Wastewater Treatment Plant(WWTP)?

a)

Bar screen

b)

Grit and sand removal tank

c)

Water clarifier

d)

Aerator

194.

Any 1 method of reducing water pollution.

4 lines
195.

Water that is not fit for use is called

a)

clean water

b)

wastewater

c)

both (a) and (b)

d)

none of these

196.

Which of the following is not a source of wastewater?

a)

Industries

b)

Homes

c)

Sewers

d)

Hospitals

197.

The period of International Decade for action on ‘Water for Life’ is

a)

2000-2010

b)

2005-2015

c)

2010-2020

d)

2003-2013

198.

The process of removing pollutants in water before it enter a water body is called

a)

cleaning of water

b)

refining

c)

filtering of water

d)

none of these

199.

Suspended impurities contained by sewage are called

a)

contaminants

b)

sludge

c)

grey water

d)

none of these

200.

Solid waste extracted during sewage treatment is known as

(a)  

201.

(a)   is the equipment that removes floatable particles from wastewater is

202.

Which of the following is a step of wastewater treatment?

a)

Aeration

b)

Chlorination

c)

Filtration

d)

All of these

203.

Sewage is mainly a

a)

liquid waste

b)

solid waste

c)

gaseous waste

d)

Mixture of solid and gas

204.

Tuberculosis is a water-borne disease?

a)

True

b)

False

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