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

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MCQ 11 Mark

Assertion (A): An ecosystem consists of biotic components and abiotic components.
Reason (R): Biotic and abiotic components play important roles for the sustenance of life and work independently in all ecosystems.

✓
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: There are both biotic (living) and abiotic (non-living) elements in an ecosystem. This is accurate because ecosystems consist of both living and non-living elements, including soil, water, air, and other non-living things like animals, plants, and bacteria. Since living things depend on nonliving resources like water, air, and soil nutrients for survival, both biotic and abiotic components are crucial to the maintenance of life. On the other hand, abiotic factors like sunshine and climate also affect how living things are distributed and behave in an ecosystem. The justification, which states that biotic and abiotic elements function separately in every ecosystem, also bolsters the assertion. This is so that life can continue to exist in an ecosystem even while living things and non-living resources do not rely on one another.

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MCQ 21 Mark

Assertion (A): For a point on the axis of a circular coil carrying current, magnetic field is maximum at the centre of the coil.
Reason (R): Magnetic field is proportional to the distance of point from the circular coil.

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 magnitude of magnetic field produced by a current carrying circular coil is maximum at the centre and is not proportional to the distance of a point from the circular coil.

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MCQ 31 Mark

Assertion (A): Urethra in human males acts as a urinogenital canal.
Reason (R): Urethra carries only urine while sperms are carried by vasa deferentia only.

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): A chemical reaction becomes faster at higher temperatures.
Reason (R): At higher temperatures, molecular motion becomes more rapid.

✓
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: A chemical reaction becomes faster at higher temperatures because at high temperature, the movement of particles are greater.

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MCQ 51 Mark

Which group(s) of organisms is/are not a constituent of a food chain?
A. Grass, lion, rabbit, wolf
B. Plankton, man, fish, grasshopper
C. Wolf, grass, snake, tiger
D. Frog, snake, eagle, grass, grasshopper

A
B and D
B
All of these
✓
B and C
D
A and C

Answer

Correct option: C.

B and C

(c) B and C
Explanation: Organisms in groups B and C do not make up a food chain. A food chain is a series of organisms in order of who eats whom. In B, grasshopper is out of place. In D, nobody out of wolf, snake or tiger eats grass.

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MCQ 61 Mark

Accumulation of non-biodegradable pesticides in the food chains in increasing amount at each higher trophic level is known as:

✓
Biological magnification
B
Accumulation
C
Eutrophication
D
Pollution

Answer

Correct option: A.

Biological magnification

(a) Biological magnification
Explanation: The chemicals used to protect crops from diseases and pests are washed down into the soil or the water bodies. From the soil, these are absorbed by the plants along with water and minerals. From the water bodies, these are taken up by aquatic plants and animals. The non-biodegradable chemicals thus enter the food chain. They get accumulated progressively at each trophic level. As human beings occupy the top level in any food chain, the maximum concentration of these chemicals gets accumulated in
human bodies. This phenomenon is known as biological magnification.

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MCQ 71 Mark

Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?

✓
2500°C
B
1500°C
C
500°C
D
4500°C

Answer

Correct option: A.

2500°C

(a) 2500°C
Explanation: 2500°C

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MCQ 81 Mark

The magnetic field strength of a solenoid can be increased by inserting:

A
A wooden piece into it
✓
An iron piece into it
C
A glass piece into it
D
Paper roll into it

Answer

Correct option: B.

An iron piece into it

(b) An iron piece into it
Explanation: An iron piece into it

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MCQ 91 Mark

In submerged water plants like Hydrilla:

✓
Light is necessary for photosynthesis
B
Photosynthesis does not occur
C
Carbon dioxide is not needed for photosynthesis
D
Light is not needed for photosynthesis

Answer

Correct option: A.

Light is necessary for photosynthesis

(a) Light is necessary for photosynthesis
Explanation: Light is necessary for photosynthesis

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MCQ 101 Mark

It a round green seeded pea plant $\text{(RRYY)}$ is crossed with wrinkled yellow seeded pea plant $($ir yy$)$ the seeds to be produced in $F_1$ generation will be:

✓
round and green
B
wrinkled and green
C
Wrinkled and yellow
D
round and yellow

Answer

Correct option: A.

round and green

round and green
Since roundness and green colour are shown by capital letters in the genotype so they are dominant traits. We know that only dominant traits are expressed in $F_1$ generation.

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MCQ 111 Mark

In the list of organisms given below, those that reproduce by the asexual method are
i. banana
ii. dog
iii. yeast
iv. Amoeba

A
(i) and (iv)
B
(ii), (iii) and (iv)
C
(ii) and (iv)
✓
(i), (iii) and (iv)

Answer

Correct option: D.

(i), (iii) and (iv)

(d) (i), (iii) and (iv)
Explanation: Asexual reproduction is the mode of reproduction in single-parent produces offsprings.
■ Amoeba reproduces asexually by binary fission.
■ Asexual reproduction occurs in yeast by means of budding and in banana asexual reproduction occurs by the means of vegetative propagation from the stem.
■ Dogs reproduced sexually.

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MCQ 121 Mark

Mendel selected garden peas as his experimental material because
i. Pea plants possess a number of well defined contrasting characters.
ii. Pea plants contain unisexual flowers.
iii. Pea plants have a short life cycle.
iv. Pea plants produce many seeds in one generation.

A
(i) and (iii) only
B
(i) and (ii) only
✓
(i), (iii) and (iv) only
D
(i) and (iv) only

Answer

Correct option: C.

(i), (iii) and (iv) only

(c) (i), (iii) and (iv) only
Explanation: (i), (iii) and (iv) only

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MCQ 131 Mark

A black strip of paper was clipped onto a destarched leaf in a potted plant to cover a part of the leaf. The plant was then exposed to sunlight for four hours, the paper strip was removed and the leaf was tested for starch.
When iodine solution was added:

A
The entire leaf turned blue-black.
✓
The uncovered part of the leaf became blue- black.
C
The colour of the iodine solution remain unchanged.
D
The covered part of the leaf became blue- black.

Answer

Correct option: B.

The uncovered part of the leaf became blue- black.

(b) The uncovered part of the leaf became blue-black.
Explanation: The uncovered part of the leaf became blue-black.

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MCQ 141 Mark

Which of the following are unsaturated hydrocarbons?
i. $H _3 C - CH _2- CH _2- CH _3$
ii. $H _3 C - C \equiv C - CH _3$

✓
(ii) and (iv)
B
(iii) and (iv)
C
(i) and (iii)
D
(ii) and (iii)

Answer

Correct option: A.

(ii) and (iv)

(a) (ii) and (iv)
Explanation: (i) and (iv) are unsaturated hydrocarbons (they contain double or triple bonds between two carbon atoms). (i) is ethyne (an alkyne). (iv) is iso-butene (2-methyl propene) A and C are saturated hydrocarbons (they contain only single bonds between the carbon atoms).

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MCQ 151 Mark

Select the correct statements.
I. Oxide ores of heavy metals are concentrated by hydraulic washing.
II. Froth floatation process is used for the concentration of magnetic ores.
III. Oxides of highly reactive metals can be reduced to metals by the action of heat alone.
IV. Carbonate ores are decomposed to form metal oxides by heating in the absence of air.

A
II and III only
B
I, III and IV only
✓
I and IV only
D
I, II, III and IV

Answer

Correct option: C.

I and IV only

(c) I and IV only
Explanation: Froth floatation process is used for the concentration of sulphide ores. Oxides of highly reactive metals are reduced to metals by electrolysis of their molten or fused oxides.

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MCQ 161 Mark

During smelting, an additional substance is added which combines with impurities to form a fusible product known as

A
Flux
✓
Slag
C
Gangue
D
Mud

Answer

Correct option: B.

Slag

During the smelting of iron, limestone is added as a flux.
The temperature inside the blast furnace decomposes limestone to calcium oxide which removes silicate impurity.
Impurities like silicon are passed into the slag. The metal is separated from the molten slag.
$\ce{CaCO _3 \rightarrow CaO + CO _2}$
$\ce{CaO + SiO_2 \rightarrow CaSiO_3(Slag)}$

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MCQ 171 Mark

$CH _2= CH _2+ BR _2( aq ) \rightarrow BrCH _2- CH _2 Br$
The above reaction is an example of:

A
Hydrogenation reaction
B
Substitution reaction
C
Combustion reaction
✓
Addition reaction

Answer

Correct option: D.

Addition reaction

(d) Addition reaction
Explanation: The given reaction is an example of the addition reaction. In this reaction, a bromine atom adds to each carbon atom of ethene. The double bond in ethene is broken and the hydrocarbon becomes saturated.

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MCQ 181 Mark

An aqueous solution A turns phenolphthalein solution pink. On addition of an aqueous solution B to A, the pink colour disappears. The following statement is true for solution A and B.

A
A is strongly acidic and B is a weak acid.
B
A has pH less than 7 and B has pH greater than 7.
C
A is strongly basic and B is a weak base.
✓
A has pH greater than 7 and B has pH less than 7.

Answer

Correct option: D.

A has pH greater than 7 and B has pH less than 7.

(d) A has pH greater than 7 and B has pH less than 7.
Explanation: A has pH greater than 7 and B has pH less than 7.

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MCQ 191 Mark

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

A
Ammonium nitrate
B
Potassium sulphate
✓
Lead acetate
D
Lead sulphate (insoluble)

Answer

Correct option: C.

Lead acetate

(c) Lead acetate
Explanation: To get lead iodide we need a compound containing lead. Hence, Ammonium nitrate and Potassium sulphate are ruled out. Lead sulphate is insoluble hence it cannot be used. So the answer is Lead acetate can be used in place of Lead Nitrate.

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MCQ 201 Mark

On adding zinc granules to freshly prepared ferrous sulphate solution, a student observes that

A
a dull brown coating is formed
✓
a greyish black coating is formed
C
coating a white coating is formed
D
no coating is formed

Answer

Correct option: B.

a greyish black coating is formed

(b) a greyish black coating is formed
Explanation: The colour of the coating is grayish black. When Zinc Reacts with ferrous sulphate zinc displaces iron forming zinc sulphate and iron metal is precipitated and settles on the surface of zinc granules. This is because zinc is more electropositive than iron so it can displace iron from its solution. Also, the solution turns colourless from light green.
$FeSO _4(a q)+ Zn (s) \rightarrow \underset{\text { Black }}{ ZnSO _4(a q)}+ Fe (s)$

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