M.C.Q

MCQ 11 Mark

Assertion (A): Ecology is study of relationship between living organisms and their environment.
Reason (R): The biotic community and non-living environment of an area function together to form an ecosystem.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.

Answer

(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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MCQ 21 Mark

Assertion (A): Force experienced by moving charge will be maximum if direction of velocity of charge is perpendicular to applied magnetic field.
Reason (R): Force on moving charge is independent of direction of the applied magnetic field.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.

Answer

(c) A is true but R is false
Explanation: From equation $F = qvB \sin \theta$
Force on moving charge will be maximum if the direction of the velocity of charge is perpendicular to direction of magnetic
field (when $\theta=90^{\circ}$ )

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MCQ 31 Mark

Assertion (A): Asexual reproduction is a primitive type of reproduction.
Reason (R): Asexual reproduction involves only mitotic cell division.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false.
D
A is false but R is true.

Answer

(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A

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MCQ 41 Mark

Assertion (A): Sodium metal is stored under Kerosene.
Reason (R): Metallic sodium melts when exposed to air

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false but R is true.

Answer

(c) A is true but R is false.
Explanation: A is true but R is false.

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MCQ 51 Mark

In the following groups of materials, which group contains only non-biodegradable materials?

A
Polythene, Detergent, PVC
B
Wood, Paper, Leather
C
Plastic, Detergent, Grass
D
Plastic, Bakelite, Cloth

Answer

(a) Polythene, Detergent, PVC
Explanation: Substances that are not broken down into simpler substances by biological processes are said to be nonbiodegradable. Polythene, detergents, and PVC (Polyvinylchloride) are non-biodegradable substances. Substances that can be broken down by biological processes are said to be biodegradable. Paper, wood, grass, leather, and cloth are biodegradable.

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MCQ 61 Mark

A system of inter-dependent food chains represents

A
Ecosystem
B
Community
C
Trophic levels
D
Food web

Answer

(d) Food web
Explanation: Food web

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MCQ 71 Mark

Match the column I with column II and select the correct option from the codes given.

Column I	Column II
(a) Electric current	(i) volt
(b) emf	(ii) ohm
(c) Resistance	(iii) ohm-metre
d) Resistivity	(iv) ampere

A
(a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
B
(a) - (iv), (b) - (ii), (c) - (i), (d) - (iii)
C
(a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
D
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

Answer

(c) (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
Explanation: (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

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MCQ 81 Mark

The process of inducing a current in a coil of wire by placing it in a region of changing magnetic field is:

A
Electrical effect
B
Magnetic effect of current
C
Electromagnetic induction
D
Heating effect of current

Answer

(c) Electromagnetic induction
Explanation: Electromagnetic induction

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MCQ 91 Mark

Refer to the following figure of phloem tissue. Which of the following statements correctly describes the relationship between cells Y and Z?

A
Ycontains ribosomes that synthesise proteins required by Z.
B
Y provides the carbohydrates that are transported by Z.
C
Y transports sucrose, while Z transports water and minerals.
D
Y helps to filter the liquid transported in Z to facilitate translocation.

Answer

(a) Ycontains ribosomes that synthesise proteins required by Z
Explanation: In the given figure of phloem tissue. Cell Y is companion cell while Z is sieve tube. Sieve tube lacks cellular
organelles, e.g., nucleus, ribosomes, etc. Hence, the adjacent companion cells provide proteins, ATP and other molecules to
carry out all the cellular functions in sieve tube cells.

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MCQ 101 Mark

Alternative forms of a gene are called

A
Chromosomes
B
Multiples
C
Loci
D
Alleles

Answer

(d) Alleles
Explanation: An alternative form of a gene is known as an allele. Alleles vary in their sequence which may or may not result
in a variant phenotype of a particular trait. Alleles represent variations of a gene that is responsible for a particular trait.

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MCQ 111 Mark

In a flower, the parts that produce male and female gametes $($germ cells$)$ are

A
stamen and style
B
filament and stigma
✓
anther and ovary
D
stamen and anther

Answer

Correct option: C.

anther and ovary

The anther is part of the stamen $($male sex organ$)$ that produce pollen $($male gamete$)$
The ovary is an inferior part of the pistil $($female sex organ$)$ which contains ovule. Female gametophyte develops in the ovule.

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MCQ 121 Mark

Father of Human genetics is

A
H.G Khurana
B
Sir Archibald Garrod
C
Gregor Mendel
D
Charles Darwin

Answer

(c) Gregor Mendel
Explanation: Gregor John Mendel is considered as the father of genetics as he laid down the principles or laws of inheritance
for the first time. Though his works were based on plants but the laws governing inheritance patterns are also applicable to
humans and hence we call them as “ Mendel's Laws of Inheritance”.

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MCQ 131 Mark

The process common to aerobic and anaerobic respiration is

A
Glycolysis
B
Electron transport chain
C
Kreb's cycle
D
Oxidation

Answer

(a) Glycolysis
Explanation: Aerobic respiration has glycolysis continued with the Krebs cycle. In anaerobic respiration, glycolysis ends with lactic acid in humans. Fermentation only has glycolysis with the end product being fermented and transform into acetic acid.

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MCQ 141 Mark

The total number of electrons shared in the formation of an ethyne molecule is:

A
10
B
4
C
3
D
6

Answer

(a) 10
Explanation: Total number of electrons shared are 10.

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MCQ 151 Mark

Among the following, the metal with lowest density is:

A
Lead
B
Magnesium
C
Aluminium
D
Lithium

Answer

(d) Lithium
Explanation: Lithium has lowest density

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MCQ 161 Mark

A metal is heated with dil $H _2 SO _4$. The gas evolved is collected by the method shown in the figure. Answer the following questions based on it:

The gas _______ than air and it is ________ in water.

A
heavier, insoluble
B
lighter, soluble
C
heavier, soluble
D
lighter, insoluble

Answer

(d) lighter, insoluble
Explanation:
1. Since the gas is collected over water so it is insoluble.
2. The gas evolved is lighter than air.

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MCQ 171 Mark

The hardness of water is caused by:

A
All of these
B
$Mg \left( HCO _3\right)_2$
C
$CaCl _2$
D
$CaSO _4$

Answer

(a) All of these
Explanation: The hardness of water is caused by magnesium and calcium salts. Calcium and magnesium dissolved
in water are the two most common minerals that make water hard. Temporary hardness is a type of water hardness caused by
the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate).

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MCQ 181 Mark

The compounds used to prepare $NaHCO _3$ are:

A
$Na _2 CO _3, CO _2, H _2 O , O _2$
B
$NaCl , NH _3, CO _2, H _2 O$
C
$NaCl , NaOH , CO _2, H _2 O$
D
$NaCl , Ca ( OH )_2, H _2 O , CO _2$

Answer

(a) $Na _2 CO _3, CO _2, H _2 O , O _2$
Explanation: The reaction between sodium carbonate $\left( Na _2 CO _3\right)$ and carbon dioxide $\left( CO _2\right)$ in the presence of water. Here's the balanced chemical equation for this reaction:
$Na _2 CO _3+ CO _2+ H _2 O \rightarrow 2 NaHCO _3$

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MCQ 191 Mark

Choose a displacement reaction:

A
Burning of metals
B
Addition of more active metal to a solution of a less active metal compound
C
Extraction of metals
D
Electrolysis

Answer

(b) Addition of more active metal to a solution of a less active metal compound
Explanation: Reactions in which atoms or ions move from one compound to others to form a new compound are known as
Displacement reactions.
A general displacement reaction can be represented using a chemical equation as follows:
$A + BC \rightarrow AC + B$
Displacement reaction takes place only when ‘A’ is more reactive than B. If ‘B’ is more reactive than ‘A’, then ‘A’ will not
displace ‘C’ from ‘BC’ and reaction will not be taken place.
Example: When zinc reacts with hydrochloric acid, it gives hydrogen gas and zinc chloride.

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MCQ 201 Mark

Four test tubes containing solutions (I), (II), (III) and (IV) are shown below along with their colours. Zinc sulphate is contained in

A
II
B
IV
C
I
D
III

Answer

(b) IV
Explanation: $ZnSO _4$ solution is colourless. It is contained in IV.

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