M.C.Q - Science STD 10 Questions - Vidyadip

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M.C.Q

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MCQ 11 Mark

Assertion (A): Decomposers help in recycling of nutrients between living and non-living components of ecosystem.
Reason (R): Decomposers help in decomposing dead bodies of organisms and return various nutrient elements to their source viz soil, water and air.

✓
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

Correct option: A.

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

(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): A compass needle is placed near a current-carrying wire. The deflection of the compass needle decreases when the compass needle is displaced away from the wire.
Reason (R): Strength of a magnetic field decreases as one moves away from a current-carrying conductor.

✓
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

Correct option: A.

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

(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 31 Mark

Assertion (A): During fertilization, the only head of the spermatozoa enters the egg.
Reason (R): If several spermatozoa hit the egg at the same time, all can enter the egg.

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
✓
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: C.

A is true but R is false.

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

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MCQ 41 Mark

Assertion (A): Colour of copper sulphate solution changes when an iron nail is kept immersed in it.
Reason (R): The colour of copper sulphate solution changes when iron nail is kept immersed in it due to the decomposition reaction taking place between iron and copper leading to formation of iron sulphate.

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
✓
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: C.

A is true but R is false.

(c) A is true but R is false.
Explanation: The colour of copper sulphate solution changes when iron nail is kept immersed in it due to the displacement reaction taking place between iron and copper leading to formation of iron sulphate. Thus assertion is true, but reason is false.

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MCQ 51 Mark

Ozone depletion has resulted in:

✓
More UV radiations on earth
B
Warming of earth
C
Decrease in temperature
D
Less UV radiations on earth

Answer

Correct option: A.

More UV radiations on earth

(a) More UV radiations on earth
Explanation: The ozone layer shields the surface of the earth from ultraviolet (UV) radiation from the Sun. Ozone depletion has resulted in more UV radiations on earth.

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MCQ 61 Mark

Which of the following organisms belong to the same trophic level? Plant, snake, insect, frog, hawk, deer

A
Hawk and deer
B
Snake and insect
C
Hawk and frog
✓
Frog and snake

Answer

Correct option: D.

Frog and snake

(d) Frog and snake
Explanation: Frog and snake both secondary consumers - belong to the same trophic level. Plant is a producer and belongs to the first trophic level. Deer is a herbivore (a primary consumer) and belongs to the second trophic level, Hawk belongs to the last trophic level.

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MCQ 71 Mark

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be-

A
100 W
B
50 W
✓
25 W
D
75 W

Answer

Correct option: C.

25 W

(c) 25 W
Explanation: Resistance of the electric bulb is $R=\frac{V^2}{P}$ or $R=\frac{220^2}{100}$
When it is operated at 110 V, the power consumed will be $P=\frac{V^2}{R}$ or $P=\frac{110^2 \times(100)}{\left(220^2\right)}$ or $P=\frac{100}{4}$ or $P=25 W$

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MCQ 81 Mark

Which of the following property of a proton can change while it moves freely in a magnetic field?

✓
momentum
B
speed
C
acceleration
D
mass

Answer

Correct option: A.

momentum

(a) momentum
Explanation: We know when a proton moves in a magnetic field its velocity changes. Momentum is the product of mass and velocity, therefore momentum also changes. Velocity and momentum are the properties which change when a proton moves freely in a magnetic field.

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MCQ 91 Mark

Refer to the given figure and select the incorrect statement regarding it.

A
It is the longest cell in human body
B
It transmits messages in the form of nerve impulses.
✓
It uses both amino acids and fatty acids as a respiratory substrate.
D
It is not repaired, when injured.

Answer

Correct option: C.

It uses both amino acids and fatty acids as a respiratory substrate.

(c) It uses both amino acids and fatty acids as a respiratory substrate.
Explanation: The given figure is of a neuron. Neurons use only glucose as a respiratory substrate.

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MCQ 101 Mark

The two versions of a trait (character) which are brought in by the male and female gametes are situated on

A
any chromosome
B
two different chromosomes
C
sex chromosomes
✓
copies of the same chromosome

Answer

Correct option: D.

copies of the same chromosome

(d) copies of the same chromosome
Explanation: The two versions of a trait that are brought in by the male and female gametes are situated on copies of the same chromosome. Each parent contributes one copy of the gene for a particular trait.

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MCQ 111 Mark

A student decides to study the impact of removing certain flower parts on fruit formation in plant species X. He chooses three separate plants that are growing in the same plot under uniform conditions. The data is given in the table below.

Plant	Part removed	Impact on formation
1	Anther	30% less fruit formed than average plan in the plot
2	Stigma	No fruit formed
3	Petal	No significant impact

Which of the following cannot be inferred from the above data?

A
Anthers and stigmas are crucial in sexual reproduction in species X.
✓
Species X relies com pletely on cross- pollination.
C
Species X is likely to be wind-pollinated.
D
Pollen grains are probably unable to germinate if they land on other parts of the carpel besides the stigma.

Answer

Correct option: B.

Species X relies com pletely on cross- pollination.

(b) Species X relies com pletely on cross-pollination.
Explanation: The removal of anthers affect fruit formation in plant 1, this implies that species X relies partially on self- pollination. The removal of either anthers or stigmas affects rate of fruit formation significantly. No fruits are observed when the stigmas in plant 2 are removed. This shows that pollen grains are probably unable to germinate if they land on any other part of the carpel besides the stigma. The petals do not seem to play a significant role in facilitating fruit formation. Species X is therefore likely to be wind-pollinated.

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MCQ 121 Mark

The branch of biology-related with heredity and variation is called

A
Livinglogy
✓
Genetics
C
Evolution
D
Taxonomy

Answer

Correct option: B.

Genetics

(b) Genetics
Explanation: Genetics is the study of genes, genetic variation, and heredity in living organisms. It is generally considered a field of biology, but intersects frequently with many other life sciences and is strongly linked with the study of information systems.

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MCQ 131 Mark

In the slide of an epidermal peel, the parts which appear pink coloured after staining with safranin are

A
nuclei only
✓
all parts in the peel
C
cell membrane and cytoplasm
D
stomata only

Answer

Correct option: B.

all parts in the peel

(b) all parts in the peel
Explanation: Safranin stains epidermal cells of the onion peel.

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MCQ 141 Mark

Which of the following represents the incorrect IUPAC name of the given compound?

✓
$CH _3 CH _2- COOCH _3$ : Ethanoic acid
B
$CH _3 CH _2- CO - CH _3$ : Butanone
C
$CH _3 CH _2- CHO :$ Propanal
D
$CH _3- CH _2- CH _2- CH _2- OH$ : Butanol

Answer

Correct option: A.

$CH _3 CH _2- COOCH _3$ : Ethanoic acid

(a) $CH _3 CH _2- COOCH _3$ : Ethanoic acid
Explanation:

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MCQ 151 Mark

Select the incorrect match.

✓
A metal used in joining electric wires - Magnesium
B
A metal extracted by using electrolytic reduction - Aluminium
C
A metal whose oxide is soluble in both acids and bases Zinc
D
A metal unreactive towards oxygen and dilute acids - Gold

Answer

Correct option: A.

A metal used in joining electric wires - Magnesium

(a) A metal used in joining electric wires - Magnesium
Explanation: Copper metal is used in joining electric wires due to its high electrical conductivity, enough tensile strength and ductility.

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MCQ 161 Mark

The property of metal by which it can be drawn into wires is called:

✓
Ductility
B
Malleability
C
Conductivity
D
Sonorous

Answer

Correct option: A.

Ductility

(a) Ductility
Explanation: Ductility

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MCQ 171 Mark

An organic compound $X$ has the molecular formula $C_2H_6O.$ Upon reaction with alkaline $KMnO_4$ it gets oxidised to compound $Y$. Which of the following reagents can be used to distinguish between compounds $X$ and $Y$?

A
All of these
B
Sodium hydroxide
C
Sodium metal
✓
Sodium carbonate

Answer

Correct option: D.

Sodium carbonate

Compound $X$ is ethanol $(CH_3CH_2OH)$ and compound Vis ethanoic acid $(CH_3COOH).$ Alcohols and acids can be distinguished by sodium carbonate as alcohols do not react with sodium carbonate while acids react with sodium carbonate to give a brisk effervescence of $CO_2$
$2 CH _3 COOH + Na _2 CO _3 \rightarrow 2 CH _3 COONa + CO _2+ H _2 O$
$CH _3 CH _2 OH + Na _2 CO _3 \rightarrow$ No reaction

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MCQ 181 Mark

Which of the following gives the correct increasing order of acidic strength?

A
Hydrochloric acid < Water < Acetic acid
✓
Water < Acetic acid < Hydrochloric acid
C
Water < Hydrochloric acid < Acetic acid
D
Acetic acid < Water Hydrochloric acid

Answer

Correct option: B.

Water < Acetic acid < Hydrochloric acid

(b) Water < Acetic acid < Hydrochloric acid
Explanation: Water < Acetic acid < Hydrochloric acid
Distilled water is neutral. Acetic acid is an organic acid so it is less acidic than hydrochloric acid which is an inorganic acid.

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MCQ 191 Mark

Methane gas released from waste water treatment plants can be used as a source of fuel. Which chemical equation represents combustion of methane to produce heat energy?

A
$2 O _2+2 H _2 O \rightarrow CO _2+ CH _4$
B
$CH _4+ CO _2 \rightarrow 2 O _2+2 H _2 O$
C
$CO _2+2 O _2 \rightarrow CH _4+2 H _2 O$
✓
$CH _4+2 O _2 \rightarrow CO _2+2 H _2 O$

Answer

Correct option: D.

$CH _4+2 O _2 \rightarrow CO _2+2 H _2 O$

(d) $CH _4+2 O _2 \rightarrow CO _2+2 H _2 O$
Explanation: $CH _4+2 O _2 \rightarrow CO _2+2 H _2 O$

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MCQ 201 Mark

What happens in the test tube shown here?

A
$H_2O$ will produce
B
$S_2O$ will produce
✓
No reaction
D
$F_eO$ will produce

Answer

Correct option: C.

No reaction

No reaction
No reaction takes place because $Fe$ is less reactive than $Zn$
$Fe + ZnSO _4 \rightarrow$ No reaction

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M.C.Q - Science STD 10 Questions - Vidyadip