NSO - Mock Test

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NSO - Mock Test - 5

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Weekly Quiz Competition

Question 1
1.2 / -0

Find the missing number in the following series:

12, 13, 17, 26, 42, ?

A
56

B
62

C
64

D
67

Solution

The series is as follows:

12 + 1²= 13
13 + 2²= 17
17 + 3² = 26
26 + 4² = 42
42 + 5² = 67
Question 2
1.2 / -0

A person starts walking towards east. After walking 25 m, he turns to his right and walks 15 m. Again, he turns to his right and walks 25 m. How far is he now from the starting point?

A
15 m

B
25 m

C
40 m

D
65 m

Solution

Let S be the starting point and E be the end point.
Question 3
1.2 / -0

F is the mother of A. D is the daughter of E. If E is the husband of F, then which of the following relations is not definitely true?

A
A is the daughter of E.

B
D is the sister of A.

C
F is the mother of D.

D
E is the father of A.

Solution

F is the mother of A and E is the husband of F. 'D is the daughter of E' means 'E is the father of D'.
F is the mother of D. D is the sister of A.
From the given information, we cannot get to know the gender of A.
So, A can be the daughter or son of E.
Question 4
1.2 / -0

Find the missing number in the following table.

A
80

B
84

C
90

D
96

Solution

First row, 4 × 8 + 8 = 40
Second row, 5 x 10 + 10 = 50
Third row, 7 x 12 + 12 = 96
Question 5
1.2 / -0

Find the water image of the following picture:

A

B

C

D

Solution

The water image will be as follows:
Question 6
1.2 / -0

Find the mirror image of the following picture:

A

B

C

D

Solution

The mirror image will be as follows:
Question 7
1.2 / -0

In a certain code, RUN is written as STO. How will RIVER be written in that code?

A
SGWFS

B
QIVGR

C
QHWFS

D
SHWDS

Solution

The code is as follows:
R + 1 = S
U - 1 = T
N + 1 = O
In the same way, RIVER will be written as follows:
R + 1 = S
I - 1 = H
V + 1 = W
E - 1 = D
R + 1 = S
Therefore, RIVER is coded as SHWDS.
Question 8
1.2 / -0

Find the missing part of the following picture:

A

B

C

D

Solution

The complete figure is given below:
Question 9
1.2 / -0

Find the missing term in the following analogy:

DFH : IKM : : MOQ : ?

A
RTU

B
RTV

C
QSU

D
QSV

Solution

The relation between the terms is as follows:
D + 5 = I
F + 5 = K
H + 5 = M
In the same way,
M + 5 = R
O + 5 = T
Q + 5 = V
So, MOQ : RTV
Question 10
1.2 / -0

Look at this series:

53, 53, 40, 40, 27, 27, ...

Which number should come next?

A
12

B
14

C
27

D
53

Solution

In this series, each number is repeated, then 13 is subtracted to arrive at the next number.
Therefore, 27 - 13 = 14
Question 11
1.2 / -0

Which of the following is not correct about thermometer?

A
Thermometer is a device which is used to measure temperature.

B
Thermometer is made of a long narrow glass tube, with a bulb at one end.

C
The narrow tubes are filled with mercury.

D
The narrow tube appears as a continuous golden line.

Solution

Thermometer is a device which is used to measure temperature. Thermometer is made of a long narrow glass tube. with a bulb at one end. The narrow tube appears as a continuous silver line because it is filled with mercury. Mercury is a metal which is in liquid state at room temperature and it readily expands or contracts at the slightest change in temperature. So, option (4) is the correct answer.
Question 12
1.2 / -0

Which of the following is an example of oscillatory motion?

A
A boy riding a bicycle on a straight path

B
Motion of a car or any moving object along a curved line

C
Pendulum of a clock

D
Motion of the Earth around the Sun

Solution

When an object repeats its motion after every fixed interval of time, the motion of the object is called periodic motion or oscillatory motion. A pendulum of a clock repeats its motion after every fixed interval of time. So, it is an example of oscillatory motion.
Question 13
1.2 / -0

Which of the following is the symbol of a device used to obstruct the flow of current?

A

B

C

D

Solution

This is the symbol of s switch in the off position.

This is the symbol of a battery.

This is the symbol of resistance, which is used to obstruct the flow of current.

This is the symbol of a bulb.
Question 14
1.2 / -0

If we pour cold water over a tin can filled with boiled water, the can gets distorted. This happens because the air inside the can gets

A
condensed and creates low pressure

B
condensed and creates high pressure

C
diluted and creates low pressure

D
diluted and creates high pressure

Solution

When we pour cold water over a tin can filled with boiled water, the can gets distorted because the air inside the can gets condensed and creates low pressure. The higher pressure from outside distorts the shape of the can.
Question 15
1.2 / -0

Which of the following options is not correct with regard to laws of reflection?

A
There are two laws of reflection.

B
The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

C
Angle of incidence and angle of reflection are same.

D
The angle between incident ray and reflected ray is less than twice the angle of incident.

Solution

The angle between incident ray and reflected ray is equal to the sum of the angle of incident and the angle of reflection. Since both of them are equal, this should be twice the angle of incident, not less than twice.
Question 16
1.2 / -0

Rahul was given a dilute solution of hydrochloric acid and was assigned a task to test it with different indicators. He poured the solution into four different test tubes and labelled them A, B, C and D. He added a few drops of phenolphthalein to test tube A, methyl orange to test tube B, litmus solution to test tube C and red cabbage extract to test tube D.

Which of the following observations made by Rahul is incorrect?

A
The solution in test tube B turns pink.

B
The solution in test tube C turns red.

C
The solution in test tube A turns pink.

D
The solution in test tube D turns dark pink.

Solution

Indicators are substances that detect the acidic or basic nature of a substance by a change in its colour.
Phenolphthalein is colourless in neutral and acidic solutions and pink in basic solutions.
Hence, the observation stated in option (3) is incorrect.

Question 17

1.2 / -0

In the table given below, match the changes listed in the first column with their classification mentioned in the second column.

A. Stretching of a rubber band	(i) Chemical change, which is permanent
B. Cutting of paper	(ii) Both physical and chemical changes
C. Burning of candle	(iii) Physical change, which is reversible
D. Cooking of food	(iv) Physical change, which is irreversible

(A) - (ii), (B) - (i), (C) - (iv), (D) - (iii)

(A) - (iii), (B) - (iv), (C) - (ii), (D) - (i)

(A) - (ii), (B) - (iv), (C) - (iii), (D) - (i)

(A) - (iii), (B) - (ii), (C) - (iv), (D) - (i)

Solution

Stretching of a rubber band is a physical change, which is reversible.
Cutting of paper is a physical change, which is irreversible.
Burning of wax is a chemical change and melting of wax is a physical change. Therefore, burning of candle involves both physical and chemical changes.
Cooking of food is a chemical change, which is permanent and irreversible.
Hence, option (2) is correct.

Question 18
1.2 / -0

Which of the following departments measures the elements of weather and keeps their record?

A
Department of meteorology

B
Department of agrometeorology

C
Department of climatology

D
Research and development department

Solution

The department of meteorology is a government department. The meteorological department measures the elements of weather and keeps their record. Meteorologists use data from satellites and analyse the data to forecast about the weather.
Question 19
1.2 / -0

Sheep is an important wool-yielding animal and wool from different breeds of sheep have different applications according to its quality. The options below provide information about the breeds of sheep that are native of different states of India. Select the option in which the information provided is incorrect.

A
Nali sheep breed is well adapted to the arid and semi-arid regions of Rajasthan and Haryana.

B
Lohi sheep is found in southern Punjab.

C
Bhakarwal is a native of Jammu and Kashmir.

D
Patanwadi, Marwari and Dumba are sheep breeds native of Rajasthan.

Solution

Patanwadi, Marwari and Dumba are three important sheep breeds of Gujarat.
Hence, the information in option (4) is incorrect.
Question 20
1.2 / -0

The process of making of food by green plants in the presence of sunlight and chlorophyll is known as photosynthesis. Which of the following reactions takes place in the process?

A
Oxygen + Water Carbohydrate + Carbon dioxide

B
Carbon dioxide + Water Carbohydrate + Oxygen

C
Oxygen + Water Carbohydrate + Oxygen

D
Carbon dioxide + Water Carbohydrate + Carbon dioxide

Solution

Chlorophyll absorbs sunlight, carbon dioxide and water, and convert them to carbohydrate and oxygen. Carbohydrate is used as food and oxygen is emitted out to atmosphere. This whole process of making of food by plants is called photosynthesis.
So, the correct reaction is:
Carbon dioxide + Water Carbohydrate + Oxygen
Question 21
1.2 / -0

Read the given statements and choose the correct option

Statement 1: Plants and animals are both dependent on each other.
Statement 2: Animals complete the process of nutrient recycling, thus maintain the concentration of soil nutrients.

A
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are correct and statement 2 is not the correct explanation of statement 1.

C
Both statements 1 and 2 are incorrect.

D
Statement 1 is correct, but statement 2 is incorrect.

Solution

Statement 2 is incorrect. Decomposers, and not animals, complete the process of nutrient recycling, thus maintain the concentration of soil nutrients.
Question 22
1.2 / -0

While playing football, Harry falls on the ground and his knee starts to bleed. The presence of which of the following will lead to stoppage of the bleeding?

A
Capillaries

B
Plasma

C
Platelets

D
Red blood cells

Solution

Platelets are responsible for clotting or coagulation of blood. In case of an injury, the blood clots after some time. This prevents excess loss of blood. Clotting of blood is a defence mechanism in the body.
Question 23
1.2 / -0

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. As a confirmatory test, she passed the gas through a test tube filled with lime water and observed that the lime water turned milky. Which of the following was the gas evolved?

A
Oxygen

B
Nitrogen

C
Carbon dioxide

D
Hydrogen

Solution

The test confirms that the gas was carbon dioxide. When passed through lime water it turns it milky because of the formation of calcium carbonate, which is a white compound insoluble in water.
The following reaction occurs:
Question 24
1.2 / -0

Which of the following methods would be useful to tackle the shortage of water?

A
Rainwater harvesting

B
Drip irrigation

C
Roof irrigation

D
All of the above

Solution

Collection of rainwater for future use is called rainwater harvesting.
Drip irrigation is a method through which maximum number of plants can be irrigated with a minimum quantity of water. For this, pipelines are laid throughout the rows of plants with holes at strategic points to release water.
In roof irrigation, water is gathered on the roof for irrigation.
All these methods help in saving water, which is an important but scarce resource.
Question 25
1.2 / -0

Why are dark and woollen clothes preferred in winter?

A
Because dark clothes absorb less heat and wool is a good conductor of heat

B
Because dark clothes absorb more heat and wool is a good conductor of heat

C
Because dark clothes absorb more heat and wool is a bad conductor of heat

D
Because dark clothes and wool are both warm

Solution

Dark clothes absorb more heat and keep one comfortable in winter. Woollen clothes are used in winter season because wool is a poor conductor of heat. In addition to it, air gets trapped in woollen fibre to further increase the poor conductivity of wool. This prevents the radiation of heat of our body to the surrounding and prevents the cold from surroundings to affect our body.
Question 26
1.2 / -0

Motion of a pendulum is an example of oscillatory motion. If a pendulum takes 55 seconds to complete 165 oscillations, then calculate its time period.

A
second

B
second

C
second

D
3 seconds

Solution

Total number of oscillations = 165
Time taken by the pendulum to complete 165 oscillations = 55 seconds
Time period =
=
= second
Question 27
1.2 / -0

What is the S.I. unit of electric current?

A
Ampere

B
Coulomb

C
Volt

D
Watt

Solution

The S.I. unit of electric current is Ampere.
Question 28
1.2 / -0

Fast moving air around a centre, usually with heavy rain, is known as a cyclone. Wind direction, wind speed, humidity and temperature together create cyclone. What is the eye of a cyclone?

A
Calm area of the cyclone

B
The centre of the cyclone

C
High speed area of the cyclone

D
Both (1) and (2)

Solution

The centre of the cyclone is called the 'eye'. A cyclone may be 10 km to 15 km high. It is a rotating mass of air. The diameter of the cyclone eye may vary from 10 km to 30 km. The eye of a cyclone is the calm area, but around the eye, air may move with high speeds such as 150 km/h to 250 km/h.
Question 29
1.2 / -0

The white light, or visible spectrum, is composed of seven colours. What are these seven colours referred to as?

A
VHBGYOR

B
VIBHYOR

C
VIBGYOR

D
WIBGYOR

Solution

The white light, or visible spectrum, is composed of seven colours. These colours are referred to as VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange and Red). When white light passes through a prism, it breaks down into its component colours. This is the reason a rainbow shows all the colours of the visible spectrum.
Question 30
1.2 / -0

A colour indicator that is dark pink with acids and green with bases is

A
Turmeric

B
China rose

C
Litmus

D
Methyl orange

Solution

China rose is a natural indicator that gives a dark pink colour with acids and turns green with bases.
Question 31
1.2 / -0

In which of the following processes is a layer of zinc, deposited over iron articles to prevent them from rusting?

A
Galvanisation

B
Crystallisation

C
Electrolysis

D
Corrosion

Solution

Galvanisation, a the process of coating iron objects with a layer of zinc in order to prevent rusting.
Zinc reacts with the atmospheric oxygen to form a sturdy layer of zinc oxide which protects the metal beneath.
Question 32
1.2 / -0

Why are rainforests found generally near the equator?

A
Because it rains heavily near the equator and most of the time its cloudy there

B
Because the places near the equator receive less sunshine and it rains heavily there

C
Because the places near the equator receive more sunshine and it rains heavily there

D
Because the weather is warm, hot and it rains less there

Solution

Rainforests are found generally near the equator. Places near the equator receive more sunshine and hence more rainfall. This makes the place hot and humid. Temperatures generally vary from 15^oC to 40^oC near the equator.
Question 33
1.2 / -0

In which of the following favourable climatic conditions do the animals living there generally bear a thick coat of hair on their bodies?

A
Winter

B
Summer

C
Autumn

D
Spring

Solution

There are many animals that bear a thick coat of hair on their bodies. Such animals generally live in cold climates.
Question 34
1.2 / -0

Which of the following types of organisms are moulds, mushrooms and yeasts?

A
Plants

B
Fungi

C
Protists

D
Monerans

Solution

Organisms that obtain food from dead and decaying organic matter are called saprophytes. For example: Fungi (moulds, mushrooms and yeasts)
Question 35
1.2 / -0

Which of the following acids is formed in the muscle cells at the end of anaerobic respiration?

A
Formic acid

B
Acetic acid

C
Citric acid

D
Lactic acid

Solution

Anaerobic respiration takes place in the absence of oxygen. Anaerobic respiration usually happens in most of the microbes. Alcohol and carbon dioxide are formed at the end of anaerobic respiration in yeast. In the muscle cells, lactic acid is formed at the end of anaerobic respiration.
Question 36
1.2 / -0

Rohan is participating in a pottery activity in his school. The composition of the soil best suited for the activity will be

A

B

C

D

Solution

Clayey soil is used to make pots, toys and statues. Hence, the soil which has the highest percentage of clay will be most suitable for the pottery activity. Soil composition in option 2 has the highest amount of clay. Therefore, option 2 is the correct answer.
Question 37
1.2 / -0

Which of the following types of animals breathe through lungs?

A
Reptiles

B
Annelida

C
Amphibians

D
Both (1) and (3)

Solution

Amphibians, reptiles and mammals use the lungs for breathing. Amphibians breathe through their skin, when they are in water. Smaller animals have different organs for breathing.
Question 38
1.2 / -0

Analyse the two statements given below and select the correct option.

Statement I: Sericulture is the term used for rearing of Bombyx mori silkworms for the production of mulberry silk.
Statement II: Moriculture is the term used for rearing of silkworms that belong to the genus Antheraea for the production of tasar silk.

A
Both statements I and II are correct and statement II is the correct reason for I.

B
Both statements I and II are correct, but statement II is not the correct reason for I.

C
Statement I is correct, but statement II is incorrect.

D
Both statements I and II are incorrect.

Solution

Both sericulture and moriculture are activities related to production of silk.
Sericulture is the general term used for rearing of silkworms for commercial production of silk.
Moriculture is cultivation of mulberry because the silkworm Bombyx mori feeds on mulberry leaves.
Therefore, both statements I and II are incorrect.
Question 39
1.2 / -0

Which of the following options is FALSE?

A
A kind of plant grown and cultivated on a large scale at a place is called crop.

B
The first step before growing crops is preparation of the soil.

C
Damaged seeds would sink in the water.

D
For growing a crop, sufficient sunlight, water and nutrients from the soil are essential.

Solution

A kind of plant grown and cultivated on a large scale at a place is called crop. The first step before growing crops is preparation of the soil. For growing a crop, sufficient sunlight, water and nutrients from the soil are essential. Damaged seeds would float on top of the water.
Question 40
1.2 / -0

Which of the following is a chemical process used for sewage treatment?

A
Sedimentation

B
Aeration

C
Filtration

D
Chlorination

Solution

The sewage treatment involves physical, chemical and biological processes to remove impurities from the waste water.
Sedimentation and filtration are both physical processes.
Aeration is a biological process.
Chlorination is a chemical process. Water purified through aeration is not fit for human consumption. It needs to be treated with chlorine. For this, bleaching powder is added to the water. This kills whatever germs may be left in the water and makes it potable.

Question 41

1.2 / -0

___A___ percent of the earth's surface is covered with water. Out of that, approximately ___B___ percent is fresh water. Nearly ____C____ percent of the earth's fresh water is frozen as glaciers and ___D___ percent is present as ground water.

Select the correct option regarding A, B, C and D.

	A	B	C	D
(1)	71	97	40	60
(2)	71	97	60	40
(3)	71	3	20	79
(4)	71	3	79	20

(1)

(2)

(3)

(4)

Solution

71% of the earth's surface is covered with water.
Out of that, approximately 97% percent is in the seas and 3% is fresh water.
Nearly 79% of the earth's fresh water is frozen as glaciers and 20% is present as ground water. The remaining 1% is present as surface fresh water.
Therefore, option (4) is correct.

Question 42
1.2 / -0

Mixture of rock particles, sand and humus is known as soil. There are different types of soils. Why is the sandy soil not fit for vegetation?

A
Because it remains wet for a very long period of time

B
Because the particles of sandy soil are packed tightly

C
Because it does not retain water

D
Because water is retained quickly

Solution

Particles of sandy soil are larger in size. Because of larger size, sand particles cannot fit closely together, and hence, there is enough space among them. So, it is not fit for vegetation because it does not retain water.
Question 43
1.2 / -0

Which of the following options is/are threat(s) caused by deforestation?

A
Shortage of drinking water

B
Soil erosion

C
Loss of habitat for animals

D
All of these

Solution

Large scale cutting of trees to clear land for human use is called deforestation. Reduced forest cover has led to soil erosion and loss of soil fertility at many places. Reduced forest cover means there is loss of habitat for many animals. Reduced forest cover has disturbed the natural process of recharging of groundwater.
Question 44
1.2 / -0

Which of the following pairs does not possess similar mode of nutrition?

A
Lizard - Venus fly trap

B
Pea Plant - Cuscutta

C
Vulture - Mushroom

D
Lice - Cuscutta

Solution

Pea plant is an autotroph, whereas Cuscutta is a parasitic plant.
Lizard - Venus fly trap (Heterotrophic nutrition)
Vulture - Mushroom (Saprotrophic nutrition)
Lice - Cuscutta (Parasitic nutrition)
Question 45
1.2 / -0

Refer to the figure given above in which A and B represent the composition of exhaled and inhaled air, respectively. Select the correct answer from the options given below.

A
A: 16.4% O₂ and 4.4% CO₂

B
A: 21% O₂ and 0.04% CO₂

C
B: 16.4% O₂ and 4.4% CO₂

D
B: 0.04% O₂ and 21% CO₂

Solution

A is the percentage of gases in exhaled air. Exhaled air contains 16.4% O₂ and 4.4% CO₂.
Question 46
1.2 / -0

The following pictures show examples of different kinds of motion. Select the option which names the motions correctly.

A
(A) Rotatory motion, (B) Oscillatory motion, (C) Rectilinear motion, (D) Curvilinear motion

B
(A) Periodic motion, (B) Rotatory motion, (C) Rectilinear motion, (D) Curvilinear motion

C
(A) Oscillatory motion, (B) Rotatory motion, (C) Curvilinear motion, (D) Rectilinear motion

D
(A) Periodic motion, (B) Curvilinear motion, (C) Rotatory motion, (D) Rectilinear motion

Solution

When an object repeats its motion after every fixed interval of time, the motion of the object is called Periodic motion. The earth revolving around the sun is an example of periodic motion, because it repeats its motion after every fixed interval of time.
Rotatory motion is the rotation of an object on its own axis.
Rectilinear motion is the motion of an object along a straight path.
Curvilinear motion is the motion of an object along a curved path.
Question 47
1.2 / -0

A flower is shown below and its parts are labelled with some letters. Find the option that gives the incorrect information about the labelled parts of the plant.

A
C has no role in attracting pollinators.

B
B contains pollen grains which produce male gametes.

C
A develops into fruit after fertilisation.

D
D is covered with a waxy and sticky substance.

Solution

C represent petals. Petals are colourful so that insects and other animals can be attracted towards them. This is necessary for pollination.

Question 48

1.2 / -0

Indicator is a substance that shows the acidic or basic nature of a substance by change in its colour or odour.
In the following table match the indicators in the column A with their respective properties from the column B.

A	B
(1) Vanilla	(a) Synthetic indicator
(2) Red Litmus	(b) Does not change its colour with an acid
(3) Phenolphthalein	(c) Changes into blue with a basic solution
(4) Methyl orange	(d) Olfactory indicator

(1) - (b), (2) - (d), (3) - (c), (4) - (a)

(1) - (a), (2) - (d), (3) - (c), (4) - (b)

(1) - (c), (2) - (b), (3) - (d), (4) - (a)

(1) - (d), (2) - (c), (3) - (b), (4) - (a)

Solution

Vanilla is used as an olfactory indicator which retains its odour with an acid but loses it with a base.
Red litmus turns blue with bases.
Phenolphthalein is a synthetic indicator which is colourless and remains colourless with acids, but turns pink with bases.
Methyl orange is a synthetic indicator. Synthetic indicators are made in laboratories.
Option (4) is correct.

Question 49
1.2 / -0

The given bar graph shows the concentration of carbon dioxide in blood samples taken from four different blood vessels from four volunteers during an experiment. Which sample was taken from the vena cava?

A
Q

B
P

C
S

D
R

Solution

Vena cava is the vein that carries carbon dioxide-rich blood to the heart. The superior vena cava is the large vein which returns blood to the heart from the head, neck and both upper limbs. The inferior vena cava returns blood to the heart from the lower part of the body.
Hence, the sample that contains the highest amount of carbon dioxide is from volunteer R.
Question 50
1.2 / -0

Match the following correctly:

A
(1) - (a), (2) - (c), (3) - (d), (4) - (b)

B
(1) - (b), (2) - (c), (3) - (a), (4) - (d)

C
(1) - (b), (2) - (c), (3) - (d), (4) - (a)

D
(1) - (c), (2) - (b), (3) - (d), (4) - (a)

Solution

An incandescent bulb is an example of a device which works because of the heating effect of electric current. The filament of the bulb is made of tungsten. Tungsten has a very high melting point and that is the reason it is used in electric bulbs.
An electric fuse is a safety device which is used in household wiring and in many appliances. Electric fuse has a body made of ceramic and two points for attaching the fuse wire. The fuse wire melts whenever there is an overload in the wiring.
In an electric cell, the stored chemical energy is changed into electric energy.
A bell works on the magnetic effect of electric current.

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NSO - Mock Test - 5

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SHARING IS CARING

Question 1

56

62

64

67

Solution

Question 2

15 m

25 m

40 m

65 m

Solution

Question 3

A is the daughter of E.

D is the sister of A.

F is the mother of D.

E is the father of A.

Solution

Question 4

80

84

90

96

Solution

Question 5

Solution

Question 6

Solution

Question 7

SGWFS

QIVGR

QHWFS

SHWDS

Solution

Question 8

Solution

Question 9

RTU

RTV

QSU

QSV

Solution

Question 10

12

14

27

53

Solution

Question 11

Thermometer is a device which is used to measure temperature.

Thermometer is made of a long narrow glass tube, with a bulb at one end.

The narrow tubes are filled with mercury.

The narrow tube appears as a continuous golden line.

Solution

Question 12

A boy riding a bicycle on a straight path

Motion of a car or any moving object along a curved line

Pendulum of a clock

Motion of the Earth around the Sun

Solution

Question 13

Solution

Question 14

condensed and creates low pressure

condensed and creates high pressure

diluted and creates low pressure

diluted and creates high pressure

Solution

Question 15

There are two laws of reflection.

The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Angle of incidence and angle of reflection are same.