NSO - Mock Test

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NSO - Mock Test - 4

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Weekly Quiz Competition

Question 1
1.2 / -0

Which two signs should be interchanged to make the equation correct?

6 + (9 - 3) ÷ (8 + 1) x (7 - 4) = 24

A
x and ÷

B
+ and ÷

C
- and ÷

D
+ and -

Solution

After interchanging x and ÷,
We get
6 + (9 - 3) x (8 + 1) ÷ (7 - 4) = 6 + 6 x 9 ÷ 3 = 24
Hence, option 1 is correct.
Question 2
1.2 / -0

Gurpartap has 5 holidays in between every consecutive exam. The first exam is on 26^th of February, which is a Friday. On which day will he have the next exam, if he has exams in a leap year?

A
2^nd March

B
3^rd March

C
4^th March

D
5^th March

Solution

In a leap year, there are 29 days in February. So, if he has one exam after 5 days, which are 27^th, 28^th, 29^th, 1^stand 2^nd, so he will have his next exam on 3^rd of March.
Question 3
1.2 / -0

In the above figure, A, B, C, D, E and F form a net. What will be opposite to C if the net is folded?

A
A

B
E

C
F

D
None of these

Solution

This is a net of pentagonal pyramid, and in this shape, there is no opposite face.
Question 4
1.2 / -0

Look carefully for the pattern, and then choose which pair of numbers comes next.

42 40 38 35 33 31 28

A
25 22

B
26 23

C
26 24

D
25 23

Solution

This is an alternating subtraction series in which 2 is subtracted twice, then 3 is subtracted once, then 2 is subtracted twice, and so on.
Question 5
1.2 / -0

Aruna knows that her friend's anniversary is between 10^th and 15^th, and Sameer knows that it is between 12^th and 18^th, but they both know that it is on Sunday. If on 10^th it is Wednesday, then what is the exact date of the anniversary?

A
12^th

B
13^th

C
14^th

D
15^th

Solution

If Wednesday is on 10^th, then Sunday is on 14^th. So, it means that the anniversary is on 14^th.
Question 6
1.2 / -0

Diana walks 4 km towards south and then turns to her left. She walks 3 km ahead and reaches a shop. Then, she turns to her left and walks 4 km. How far is she from the starting point?

A
11 km

B
9 km

C
5 km

D
3 km

Solution

The diagram shows that the distance is 3 km from the start.
Question 7
1.2 / -0

Find out the alternative figure which contains figure (X) as its part.

A
(a)

B
(b)

C
(c)

D
(d)

Solution
Question 8
1.2 / -0

Which of the following is the net of the given shape?

A

B

C

D

Solution

The given shape is a square pyramid which has 1 square face and 4 triangular faces.
Question 9
1.2 / -0

Pointing towards a girl, Sonu said, "She is the mother of my paternal grandfather's son." How is the girl related to Sonu?

A
Mother

B
Grandmother

C
Aunt

D
Sibling

Solution

Grandfather's son means either son or uncle.
Mother of uncle or son is grandmother.
So, grandmother is the correct answer.
Question 10
1.2 / -0

Find the odd one out in the given series.

43, 88, 179, 358

A
43

B
88

C
179

D
358

Solution

Each time, we are multiplying by 2 and then adding 2.
43 x 2 = 86 + 2 = 88
88 x 2 = 176 = 176 + 2 = 178 (actual)
178 x 2 = 356 + 2 = 358
So, 179 is the odd one out..

Question 11

1.2 / -0

Observe the Venn diagram given below and select the option that best represents A, B, C, D and E.

S. No.	A	B	C	D	E
1.	Glass	Mercury	Ink	Wood	Aluminium
2.	Aluminium	Ink	Glass	Wood	Mercury
3.	Glass	Mercury	Wood	Ink	Aluminium
4.	Glass	Aluminium	Ink	Wood	Mercury

(1)

(2)

(3)

(4)

Solution

Glass is a transparent non-metallic solid.
Mercury is a metal which is liquid at room temperature. It is an opaque material.
Ink is an opaque liquid.
Wood is an opaque solid. It is not a metal.
Iron is a metal. It is an opaque material and is solid at room temperature.

Question 12
1.2 / -0

What happens if a magnet is left to itself over a long period of time?

A
It loses its magnetic property.

B
Its magnetic property gets stronger.

C
No effect on properties of magnet.

D
It starts dissolving at its own.

Solution

If a magnet is left to itself over a long period of time, it gets demagnetised, i.e. it loses its magnetic property.
Question 13
1.2 / -0

Which of the following statements is not true for reflection in plane mirror?

(a) Angle of incident is equal to angle of reflection.
(b) The image is inverted horizontally.
(c) The image is inverted vertically.

A
Only (a)

B
Only (a) and (b)

C
Only (c) and (a)

D
Only b

Solution

The image in case of reflection through plain mirror is erect vertically but inverted horizontally.
Question 14
1.2 / -0

A student wants to check the presence of starch in potato, so he puts iodine solution with a dropper on potato. What effect will be shown?

A
Blue black colour will be observed when iodine solution is applied.

B
Blue colour will be observed when iodine solution is applied.

C
Black colour will be observed when iodine solution is applied.

D
Blue red colour will be observed when iodine solution is applied.

Solution

After putting iodine solution on potato, blue black colour will be observed.
Question 15
1.2 / -0

If the the refractive index of any glass is 1, then which of the following statements is true regarding the glass?

A
The refracted ray will turn towards normal after refraction.

B
The refracted ray will turn away from normal after refraction.

C
The light will be partially reflected.

D
The glass will become invisible.

E
The speed of light in glass is less than the speed of light in air.

Solution

As the refractive index it 1, the light will not go through any deviation. Hence, the glass will be invisible.
Question 16
1.2 / -0

In which of the following cases will regular reflection not take place when a beam of light strikes it?

A
Marble flooring with oil spread over

B
Mirror

C
Shiny metal sheet

D
Unpolished wooden surface

E
Water

Solution

When a beam of light strikes an unpolished wooden surface, there will be a diffused reflection as an unpolished wooden surface is irregular, and not smooth.
Question 17
1.2 / -0

Piyush does not consume protein-rich food for a long time. Which of the following disorders can he face?

A
Poor vision

B
Swelling of face

C
Weak teeth

D
Bleeding gums

Solution

Deficiency of proteins in the diet for a long time results in swelling of the face, swollen neck, undergrowth of the body, etc. This is because proteins are the building blocks of the body and should be taken in sufficient amounts.
Question 18
1.2 / -0

Which type of roots is present in the plant shown below?

A
Lateral roots

B
Tap roots

C
Fibrous roots

D
Transpiratory roots

Solution

The plant shown in the picture has parallel venation. The plants with leaves having parallel venation generally have fibrous roots, i.e. there is no central root.
Question 19
1.2 / -0

Which of the following statements is not true?

A
Aquatic animals can breathe inside the water.

B
Earthworms cannot breathe inside the soil.

C
Flour mills can be run by moving air.

D
Plants cannot live without oxygen for long time.

Solution

Earthworms can breathe inside the soil. They come outside only when water takes the place of air in the soil.
Question 20
1.2 / -0

How do organisms living in the soil breathe?

A
They use nitrogen from the soil.

B
They use carbon dioxide from the soil.

C
They use oxygen from the air trapped in the pockets of the soil.

D
They use water vapours from the soil.

Solution

Air is also an important part of soil. Within the soil, pockets of air are trapped. The organisms living in the soil use oxygen from the air trapped in the pockets of the soil.
Question 21
1.2 / -0

An electrician uses a screw-driver to repair the electric devices. The handle of a screw-driver is usually made of

A
rubber or plastic

B
iron

C
steel

D
aluminium

E
quartz

Solution

The handle of a screw-driver is made of rubber or plastic, as rubber and plastic are bad conductors of electricity.
Question 22
1.2 / -0

Observe the given flow chart showing the interconversion of different states of water, brought about by either heating or cooling.

The process A, B and C respectively are:

A
Freezing, Vaporisation, Condensation

B
Fusion, Vaporisation, Condensation

C
Vaporisation, Condensation, Fusion

D
Malting, Condensation, Evaporation

Solution
Question 23
1.2 / -0

Study the following flow chart to identify food components 'X', 'Y' and 'Z'.

Read the following statements regarding 'X', 'Y' and 'Z', and select the correct ones.

(i) Cellulose is a 'X', which is not a food for humans.
(ii) Z are the richest source of energy to our body, but they require more oxygen for their combustion.
(iii) When we consume more Z than required, our body stores the excess of Z as Y.
(iv) X act as insulator and keep our body warm.
(v) X are essential for the maintenance of body tissues.

A
(i), (ii) and (iii)

B
(ii) and (v)

C
(iii), (iv) and (v)

D
(i) and (iv)

Solution

X represents proteins since proteins contain nitrogen also in addition to carbon, hydrogen and oxygen. Proteins are essential for the maintenance of body tissues. Hence, statement (v) is correct.
Fats and carbohydrates are made up of carbon, hydrogen and oxygen. Fats are insoluble in water. Hence, Z represents fats.
Carbohydrates are soluble in water. Hence, Y represents carbohydrates. Fats are the richest source of energy to our body, but they require more oxygen for their combustion. Hence, statement (ii) is correct.
Question 24
1.2 / -0

Light is a form of energy produced by a

A
luminous object

B
transparent object

C
non-luminous object

D
opaque object

E
atom object

Solution

Light is a form of energy produced by a luminous object. An object is considered luminous if it emits its own light.
Question 25
1.2 / -0

The given figure is a cross section of the lady's finger fruit. Identify: (i) the parts labelled 'X', and (ii) the parts of the flower from where they have been developed.

A
(i) - Pollen grains
(ii) - Anthers

B
(i) - Seeds
(ii) - Ovules

C
(i) - Ovules
(ii) - Ovary

D
(i) - Seeds
(ii) - Stigma

Solution

Structure X represents seeds of the lady's finger fruit. After fertilisation occurs, each ovule develops into a seed. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.
Question 26
1.2 / -0

Which of the following is/are the symptom(s) of Kwashiorkor?

A
Anaemia

B
Dark and scaly skin

C
Mental retardation

D
All of the above

Solution

Kwashiorkor is a severe form of malnutrition, caused by a deficiency in dietary protein. Symptoms of Kwashiorkor are: Dark and scaly skin, anaemia, and mental retardation.

Question 27

1.2 / -0

Observe the diagram depicting some stages during the processing of cotton, and identify the parts labelled X, Y and Z.

S. No.	X	Y	Z
1.	Cotton bolls	Seeds	Lint
2.	Lint	Cotton bolls	Bales
3.	Cotton bolls	Seeds	Bales
4.	Bales	Cotton bolls	Lint

(1)

(2)

(3)

(4)

Solution

The machine shown is a ginning machine. Cotton bolls are fed into the machine in order to separate seeds from the fibres. The fibre separated at this stage is called lint.

Question 28
1.2 / -0

The stem(s) of which of the following plants is/are the source of food?

A
Ginger

B
Potatoes

C
Garlic

D
All of the above

Solution

Potatoes, garlic and ginger are underground stems modified to store food.
Question 29
1.2 / -0

The rate of sedimentation can be improved by which process?

A
Heating

B
Cooling

C
Loading

D
Stirring

Solution

Sedimentation involves settling down of suspended heavy particles present in a mixture at the bottom of the container when left undisturbed for some time. Loading is the process used to speed up the sedimentation process. Alum is commonly used for the purpose of loading.
Question 30
1.2 / -0

Pigments of photosynthesis are present in which organelle of the plant cell?

A
Cytoplasm

B
Chloroplast

C
Nucleus

D
Mitochondrion

Solution

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Question 31
1.2 / -0

Which of the following statements about cooking of food are incorrect?

a. It is a chemical and reversible change.
b. It is a physical and reversible change.
c. It is a physical and irreversible change.
d. It is a chemical and irreversible change.

A
a and b

B
c and d

C
a, b and c

D
a, c and d

Solution

Cooking of food is an irreversible chemical change. Hence, only statement d is correct.
Question 32
1.2 / -0

In a process of photosynthesis, plants take carbon dioxide and release oxygen. Which of the following is/are responsible for taking carbon dioxide from atmosphere?

A
Stomata

B
Stem

C
Roots

D
Sepals

Solution

Stomata take carbon dioxide from atmosphere and are responsible for the process of photosynthesis.
Question 33
1.2 / -0

A mixture of stones, sand and salt in water is passed through a series of processes, A, B and C. The stones are separated out after process A, sand after process B and salt after process C, as indicated in the flow chart.

The correct identification of processes A, B and C is:

A
A: Sieving
B: Filtration
C: Evaporation

B
A: Filtration
B: Sieving
C: Evaporation

C
A: Filtration
B: Evaporation
C: Sieving

D
A: Evaporation
B: Filtration
C: Sieving

Solution

Stones being bigger in size can be separated out by sieving.
Sand on filtration will separate out as a residue.
Water evaporates when the mixture is heated slowly or placed in the sun, leaving salt behind.
Question 34
1.2 / -0

What is the name of the process by which pure solids of copper sulphate can be obtained from its impure sample?

A
Recrystallisation

B
Filtration

C
Sublimation

D
Fraction distillation

Solution

Recrystallisation or crystallisation is the process by which we can obtain pure crystals of copper sulphate from an impure sample.
For this, first a supersaturated solution of the salt is prepared and allowed to cool slowly. Clean blue crystals are formed which are separated out and dried between the folds of the filter paper.
Question 35
1.2 / -0

What is the other name of sundial, which was used to measure time in olden days?

A
Samrat Yantra

B
Qutub Yantra

C
Magneto Graphs

D
Hourglass

Solution

In olden days, shadows caused by objects placed in the sun were used to measure time. Such a device is called a sundial or Samrat Yantra.
Question 36
1.2 / -0

Which part of amoeba is responsible for taking food inside the body?

A
Pseudopodia

B
Cilia

C
Flagella

D
Villi

Solution

Amoebae use their pseudopods to ingest food by a method called phagocytosis. The streaming of protoplasm inside the pseudopods moves the amoeba forward. When the organism contacts a food particle, the pseudopods surround the particle.
Question 37
1.2 / -0

Which of the following is not an example of reversible change?

A
Contraction of metal

B
Making of curd from milk

C
Melting of ice

D
Folding of paper

Solution

Curdling of milk is a chemical change in which the lactose sugar in milk is converted to lactic acid. It is an irreversible change because the product obtained cannot be changed back into its original form.
Question 38
1.2 / -0

Which of the following pollutants causes ozone holes?

A
Carbon dioxide

B
Sulphur dioxide

C
Carbon monoxide

D
Chlorofluorocarbon

E
Hydrogen sulphide

Solution

Chlorofluorocarbons, also known as CFCs, consist of chemical compounds made up of chlorine, fluorine and carbon. These are harmful when released into the atmosphere because of their destructive reaction with ozone molecules, which provide the Earth with a protective layer against UV radiation.
Question 39
1.2 / -0

Which of the following can be separated by threshing?

A
Butter from milk

B
Pebbles from sand

C
Grain from stalk

D
Tea from liquor

Solution

Threshing is the process of removing the grain of wheat or barley from the stalk and husk.
Threshing is done on a threshing floor, a flat area of hard rock, on which freshly harvested wheat is piled and then beaten with sticks or trampled under hoofs of the cattle.
Question 40
1.2 / -0

In the given food chain, who is the secondary consumer?

Grass Grasshopper Frog Snake

A
Snake

B
Frog

C
Grasshopper

D
Grass

E
All of the above

Solution

The food chain follows the order as given below:
Producer Primary consumer Secondary consumer Tertiary consumer
Hence, Grass Grasshopper Frog Snake

Frog = Secondary consumer
Question 41
1.2 / -0

Which of the following vitamin is required for clotting of blood?

A
Vitamin A

B
Vitamin K

C
Vitamin B

D
Vitamin E

Solution

Vitamin K is required for clotting of blood.
Question 42
1.2 / -0

Which of the following is incorrect regarding skeletal support system of different organisms?

A
Earthworms have liquid skeleton where liquid-filled spaces inside the body serve as a support system.

B
Skeletal muscles work in pairs.

C
Snakes have bristles on the under surface of the body to support movement.

D
Birds have hollow bones with air-filled cavities.

E
None of the above

Solution

Earthworms have bristles on the underside of the body to support movement. The bristles are connected with muscles. The bristles help to get a good grip on the ground.
Question 43
1.2 / -0

Which of the following statements is false about these circuits?

A
In circuit 2, the current will flow through battery but not through bulb.

B
The heat will produced in bulb in circuit 1.

C
Total charge in the circuit remains same.

D
The current will flow in clockwise direction in circuit 2.

Solution

The statement in option 1 is incorrect because when the key is open, no current will flow through in any element of the circuit.
Question 44
1.2 / -0

Citrus fruits which are rich in vitamin C help in recovery of __________.

A
rickets

B
beri-beri

C
scurvy

D
night blindness

Solution

Vitamin C is essential for healing bleeding gums and wounds. Citrus fruits like oranges, grapes, lemons, tomatoes should be eaten in this situation.
Question 45
1.2 / -0

Skeleton of the body is the combination of which two components?

A
Cartilages and bones

B
Water and blood

C
Muscles and fat

D
Fat and cartilages

Solution

The combination of cartilages and bones forms the skeleton of the body.

Question 46

1.2 / -0

Match the following joints with their positions in the human body and select the correct option based on that.

1. Ball and socket joint	a. Wrist joint
2. Pivot joint	b. Knee joint
3. Hinge joint	c. Joint between the skull and the vertebral column
4. Gliding joint	d. Rounded end of one bone fits into the cavity of another bone.

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

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

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

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

Solution

Ball and socket joint: In this joint, the rounded end of one bone fits into the cavity (hollow space) of another bone. It permits movement in all directions. The joint between shoulder and the upper arm is an example of ball and socket joint.
Pivot joint: This type of joint allows movements in many planes, viz. up and down, side to side movements. The joint between the skull and the vertebral column is an example of pivot joint.
Hinge joint: This joint is similar to the hinges in a door. This joint allows movement only in one plane and only up to 180⁰. The knee joint and elbow joint are examples of hinge joint.
Gliding joint: The movement in this joint happens due to sliding of bones over one another. Joints between the rings of the backbone are examples of gliding joint. The wrist joint is also an example of gliding joint.

Question 47

1.2 / -0

Match the parts (a, b, c, d) of the chart with the statements (1, 2, 3, 4) given below:

a. Winnowing	1. Cooling of vapour into its liquid state
b. Filtration	2. Separation of lighter particles from heavier particles under the influence of wind
c. Condensation	3. Separation of solid crystals of the solute from the supersaturated solution
d. Crystallisation	4. Separating insoluble, suspended, solid particles from the liquid component in a mixture

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

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

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

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

Solution

Winnowing: The process of separating lighter particles from the heavier component of a mixture under the influence of wind is called winnowing. Grains are separated from husk by this method.
Filtration: This method is used for separating fine insoluble solid particles from a suspension.
Condensation: The process of cooling the vapour to convert it into liquid is called condensation.
Crystallisation: Pure crystals of a solute can be separated by cooling a supersaturated solution of the substance. The process is called crystallisation.

Question 48

1.2 / -0

Observe the table given below and select the correct match between the terms in column I with suitable options from columns II and III.

Column I	Column II	Column III
1. Water cycle	a. Scarcity of water	(i) Water is a renewable resource.
2. Rainwater harvesting	b. Circulation of water	(ii) Water table falls.
3. Drought	c. Collecting water	(iii) Catch water where it falls

2, c, iii

1, c, i

3, a, iii

2, a, ii

Solution

The continuous circulation of water between the land and the atmosphere is known as the water cycle. This phenomenon maintains the supply of water on land and is responsible for water being a renewable resource.
Collecting and storing rainwater for use is called rainwater harvesting. The basic idea behind rainwater harvesting is "Catch water where it falls". Hence, rainwater from the terraces, drains etc. is directed towards the ground.
Drought is a condition of extreme water shortage created when it does not rain in a region for a long period of time. Soil loses the water due to evaporation and transpiration, and the water table falls.

Hence, the correct match is:

Column I	Column II	Column III
1. Water cycle	b. Circulation of water	(i) Water is a renewable resource.
2. Rain water harvesting	c. Collecting water	(iii) Catch water where it falls.
3. Drought	a. Scarcity of water	(ii) Water table falls.

Therefore, only option (1) is correct.

Question 49
1.2 / -0

The above figure depicts the characteristics of X. Choose the correct statement about X from the following:

A
X is fibrous in mango.

B
X conducts water in the plants.

C
X is the first part that emerges during germination.

D
X bears nodes and internodes.

Solution

X is root and it anchors the plant, absorbs water and stores food in plants like radish.
Root is the first part that emerges during germination.
Question 50
1.2 / -0

Complete the flow chart given below:

A
(a) dry cell
(b) metallic cap
(c) flat base
(d) wet cell

B
(a) device which produces electric current
(b) dry cell
(c) wet cell
(d) metallic cap

C
(a) device which does chemical reaction
(b) dry cell
(c) wet cell
(d) flat base

D
(a) which produces electric current
(b) wet cell
(c) dry cell
(d) flat base

Solution

Electric Cell: Electric cell is a device which produces electric current because of chemical reaction. Electric cells can be of dry type or wet type. The car battery is made up of wet cells. The cells in a torch are dry cells.
Dry Cell: A dry cell is usually made of metallic cylinder. It has a flat base and a metallic cap on top. The metallic cap on top is the positive (+) end of the cell. The flat base is the negative (-) end of the cell.

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SHARING IS CARING

Question 1

x and ÷

+ and ÷

- and ÷

+ and -

Solution

Question 2

2nd March

3rd March

4th March

5th March

Solution

Question 3

A

E

F

None of these

Solution

Question 4

25 22

26 23

26 24

25 23

Solution

Question 5

12th

13th

14th

15th

Solution

Question 6

11 km

9 km

5 km

3 km

Solution

Question 7

(a)

(b)

(c)

(d)

Solution

Question 8

Solution

Question 9

Mother

Grandmother

Aunt

Sibling

Solution

Question 10

43

88

179

358

Solution

Question 11

(1)

(2)

(3)

(4)

Solution

Question 12

It loses its magnetic property.

Its magnetic property gets stronger.

No effect on properties of magnet.

It starts dissolving at its own.

Solution

Question 13

Only (a)

Only (a) and (b)

Only (c) and (a)

2^nd March

3^rd March

4^th March

5^th March

12^th

13^th

14^th

15^th