CBSE Class 10th Science Mix Test

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CBSE Class 10th Science Mix Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

The compound which is a major component of bio-gas and CNG is :

A
Methane

B
Ethane

C
Propane

D
None

Solution

Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide.

Major component of CNG is methane, the other components present are: ethane, propane, nitrogen, carbon dioxide, hydrogen sulphide and traces of water.
Question 2
1 / -0

When excess \(CO_2\) is passed through lime water, the milkiness disappears. This is due to the formation of :

A
Calcium carbonate

B
Calcium bicarbonate

C
Calcium sulphate

D
None

Solution

When \(CO_2\) is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.

\(\underset{Lime\;water}{Ca(OH)_2}+CO_2\longrightarrow\) \(\underset{milkiness}{CaCO_3}+H_2O\)

However, when excess of \(CO_2\) is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate, which is colourless and soluble in water.

\(\underset{milkiness}{CaCO_3}+H_2O+\underset{excess}{CO_2}\longrightarrow\) \(\underset{water\;soluble}{Ca(HCO_3)}\)
Question 3
1 / -0

Assertion(A): Changes in packaging have resulted in much of our waste becoming nonbiodegradable.

Reasons(R): Changes in attitude also have a role to play, with more and more things we use becoming disposable.

A
Both A and R are true, and R is correct explanation of the assertion

B
Both A and R are true, but R is not the correct explanation of the assertion.

C
A is true, but R is false

D
A is false, but R is true
Question 4
1 / -0

Assertion(A): Some organisms can make organic compounds like sugar and starch from inorganic substances using the radiant energy of the sun in the presence of chlorophyll

Reasons(R): These organisms are called producers which include all green plants and certain bacteria which can produce food by photosynthesis.

A
Both A and R are true, and R is correct explanation of the assertion

B
Both A and R are true, but R is not the correct explanation of the assertion

C
A is true, but R is false.

D
A is false, but R is true
Question 5
1 / -0

Assertion(A): A cell divides to give rise to two cells.

Reasons: This is a basic event in reproduction in which cells use chemical reactions to build copies of their DNA.

A
Both A and R are true, and R is correct explanation of the assertion.

B
Both A and R are true, but R is not the correct explanation of the assertion

C
A is true, but R is false.

D
A is false, but R is true.
Question 6
1 / -0

The gas produced when dilute hydrochloric acid is added to a reactive metal is :

A
Oxygen

B
Nitrogen

C
Carbon dioxide

D
Hydrogen gas

Solution

When dilute HCl react with reactive metals like alkali metal or alkaline metal, hydrogen gas is liberated.

For example:

\(Mg+2HCl\longrightarrow\) \(MgCl_2+H_2\)

Reaction when iron reacts with dilute \(H_2SO_4\)

\(Fe(s)+H_2SO_4(aq)\longrightarrow\) \(FeSO_4(aq)+H_2(g)\)
Question 7
1 / -0

The taste or smell of fat change when kept for a long time due to

A
Oxidation

B
Reduction

C
Fermentation

D
None

Solution

When food materials containing fats and oils are left for a long time, they become rancid (i.e) fat and oil present in them get oxidised. The methods which are used to slow down oxidation are:

a) Keeping food in air tight container

b) Flushing the bags containing food with nitrogen gas

c) Refrigerating food also helps to slow down rancidification.
Question 8
1 / -0

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Some variants survived due to

A
Healthy structure

B
Variations

C
Adaptability

D
None
Question 9
1 / -0

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation occurs due to:

A
DNA copying always have some variations

B
Species desire to change

C
Bio- chemical reaction similarity

D
None
Question 10
1 / -0

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variations leads to:

A
Survival of species

B
Survival of individual

C
Both (A) and (B)

D
None
Question 11
1 / -0

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation and evolution are interrelated

A
True

B
False

C
Cannot be said

D
None
Question 12
1 / -0

If there were a population of bacteria living in temperate waters, and if the water temperature were to be increased by global warming, most of these bacteria would die, but the few variants resistant to heat would survive and grow further.

Variation is prominent in:

A
Unicellular organism

B
Multicellular organism

C
Multicellular organism

D
None
Question 13
1 / -0

The process of peristaltic movements in digestive tube is controlled by

A
Brain

B
Nerves

C
Medulla oblongata

D
None

Solution

The process of peristalsis is controlled by the medulla oblongata. The muscularis externa is responsible for segmental contractions and peristaltic movement in digestive tube.These muscles cause food to move and churn together with digestive enzymes down the tube.
Question 14
1 / -0

The part of Phloem which is responsible for translocation of food in plants is

A
Cortex

B
Sieve tubes

C
Epithelial tissues

D
None.

Solution

For translocation, food molecules enter the part of the phloem called the sieve tubes, where they can be transported upwards or downwards to all parts of the plant including roots. Translocation is achieved by utilizing energy from the ATP that provides osmotic pressure required for upward and downward movement of food.
Question 15
1 / -0

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Formula of rusting is

A
\(Fe_2O_3.xH_2O\)

B
\(FeO.2H_2O\)

C
\(Fe_3O_4\)

D
None
Question 16
1 / -0

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Rusting of iron is same as ...........in other material.

A
Corrosion

B
Rancidity

C
Tarnishing

D
None
Question 17
1 / -0

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Due to corrosion, silver becomes

A
Green

B
Red

C
Black

D
None
Question 18
1 / -0

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Due to corrosion, copper becomes

A
Blue

B
Green

C
Grey

D
None
Question 19
1 / -0

Iron articles are shiny when new, but get coated with a reddish-brown powder when left for some time. This process is commonly known as rusting of iron.

Corrosion causes damage to:

A
Car bodies

B
Bridges

C
Iron railings

D
All
Question 20
1 / -0

The respiratory pigment in human beings is

A
Haemoglobin

B
Melanin

C
Melanin

D
None

Solution

In human beings (the vertebrates), the respiratory pigment is haemoglobin, contained in the erythrocytes (red blood cells). Keratinocytes or squamous cells are in the middle layer of the epidermis and produce Keratin, the protein that forms the protective outer layer.

Melanocytes make melanin, the pigment that provides colour to the skin.
Question 21
1 / -0

Which mirror is used as a shaving mirror ?

A
Concave mirror

B
Convex mirror

C
Plane mirror

D
Cylindrical lens.

Solution

Concave mirror is used as shaving mirrors to see a larger image of the face.
Question 22
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

Magnification is given by:

A
\(\frac{h'}{h}\)

B
\(\frac{-v}{u}\)

C
Both (A) and (B)

D
None
Question 23
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

The height of object is taken as positive because:

A
It is placed above the principal axis

B
It is placed below the principal axis

C
It is a real object

D
None
Question 24
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

If magnification is negative, then image is

A
Real

B
Virtual

C
Both (A) and (B)

D
None
Question 25
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

‘v’ is negative when image is:

A
Real

B
Virtual

C
Both (A) and (B)

D
None
Question 26
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

‘f’ is negative for

A
Convex mirror

B
Convex mirror

C
Cylindrical mirror

D
None
Question 27
1 / -0

The distance of the principal focus from the pole is called the focal length (f). There is a relation between object distance(u), image distance(v) and focal length(f), given by the mirror formula which is expressed as: \(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

If u = 25 cm, f = 15 cm, mirror is concave, then ν =?

A
25 cm

B
-25 cm

C
37.5 cm

D
None
Question 28
1 / -0

How much energy is given to each coulomb of charge passing through a 6V battery ?

A
5J

B
6J

C
7J

D
8J

Solution

The energy given to each Coulomb of charge is equal to the amount of work required to move it. Thus, we have

\(W=v\times q\)

\(=6\times1\)

= 6 J
Question 29
1 / -0

An electric iron of resistance \(20\Omega\) takes a current of 5A .Calculate the heat developed in 30 s.

A
\(1.5\times10^4\;J\)

B
\(3.0\times10^4\;J\)

C
\(4.5\times10^4\;J\)

D
None.

Solution

The amount of heat (H) produced is given by the joule’s law of heating as,

\(H = VIt\) , where Current, I = 5A Time, t = 30s

\(\therefore\) Voltage, \(V=I\times R\)

\( =5\times20=100\;V\)

\(\therefore\) \(H=100\times5\times30\)

\(=1.5\times10^4\;J\)

Therefore, the amount of heat developed in the electric iron is \(1.5\times10^4\;J\)
Question 30
1 / -0

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Biotic components of ecosystems are:

A
Plants

B
Animals

C
Microorganisms

D
All
Question 31
1 / -0

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Abiotic components are:

A
Living

B
Non- living

C
Borderline between living and non- living

D
None
Question 32
1 / -0

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Examples of natural ecosystems are:

A
Forests

B
Ponds

C
Lakes

D
All
Question 33
1 / -0

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Examples of artificial ecosystems are:

A
Gardens

B
Aquarium

C
Crop- fields

D
All
Question 34
1 / -0

Ecosystem consists of biotic components comprising living organisms and abiotic components comprising physical factors like temperature, rainfall, wind, soil and minerals. Ecosystems can be natural or can be artificial (manmade).

Several ecosystems combine to form:

A
Lithosphere

B
Lithosphere

C
Lithosphere

D
Biome
Question 35
1 / -0

The change in colour we observe when a drop of methyl orange is added to \(Mg(OH)_2\)

A
Yellow colour

B
Red colour

C
Blue colour

D
No colour change.

Solution

When methyl orange is added to \(Mg(OH)_2\), it turns into golden yellow colour.

NOTE: Methyl orange is a \(P^H\) indicator used in titrations because of its clear and distinct colour change. It shows red colours in acidic and yellow colour in basic medium.

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Re-Attempt Weekly Quiz Competition

CBSE Class 10th Science Mix Test - 9

Result

CBSE Class 10th Science Mix Test - 9

Score

-

Rank

-

SHARING IS CARING

Question 1

Methane

Ethane

Propane

None

Solution

Question 2

Calcium carbonate

Calcium bicarbonate

Calcium sulphate

None

Solution

Question 3

Both A and R are true, and R is correct explanation of the assertion

Both A and R are true, but R is not the correct explanation of the assertion.

A is true, but R is false

A is false, but R is true

Question 4

Both A and R are true, and R is correct explanation of the assertion

Both A and R are true, but R is not the correct explanation of the assertion

A is true, but R is false.

A is false, but R is true

Question 5

Both A and R are true, and R is correct explanation of the assertion.

Both A and R are true, but R is not the correct explanation of the assertion

A is true, but R is false.

A is false, but R is true.

Question 6

Oxygen

Nitrogen

Carbon dioxide

Hydrogen gas

Solution

Question 7

Oxidation

Reduction

Fermentation

None

Solution

Question 8

Healthy structure

Variations

Adaptability

None

Question 9

DNA copying always have some variations

Species desire to change

Bio- chemical reaction similarity

None

Question 10

Survival of species

Survival of individual

Both (A) and (B)

None

Question 11

True

False

Cannot be said

None

Question 12

Unicellular organism

Multicellular organism

Multicellular organism

None

Question 13

Brain

Nerves

Medulla oblongata

None

Solution

Question 14

Cortex