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

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M.C.Q

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20 questions · timed · auto-graded

MCQ 11 Mark

Assertion (A): Flow of energy in a food chain is unidirectional.
Reason (R): Energy captured by autotrophs does not revert back to the solar input and it passes to the herbivores.

✓
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: The flow of energy through different steps in the food chain is unidirectional. This means that energy captured by autotrophs does not revert back to the solar input and it passes to the herbivores.

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MCQ 21 Mark

Assertion (A): Deflection of the iron filings changes when current in the conductor varies.
Reason (R): Magnitude of the magnetic field does not change with the magnitude of current.

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: Assertion is correct but the reason is wrong. As the current changes in the conductor, magnitude of the magnetic field produced also vanes which is the reason for a change in the deflection of the iron filings.

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MCQ 31 Mark

Assertion (A): Vagina is also called a birth canal.
Reason (R): During birth, the baby passes through the vagina.

✓
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: Vagina is called as birth canal because the baby passes through the vagina during birth.

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MCQ 41 Mark

Assertion (A): Corrosion of iron is commonly known as rusting.
Reason (R): Corrosion of iron occurs in presence of moist air.

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

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

(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Both A and R are true but R is not the correct explanation of A

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MCQ 51 Mark

Exposure to ultraviolet radiation causes eye disease like:

A
Conjunctivitis
✓
Cataract
C
Short-sightedness
D
Colour blindness

Answer

Correct option: B.

Cataract

(b) Cataract
Explanation: Exposure to ultraviolet (UV) radiation can cause eye diseases like cataract. A cataract is a clouding of the lens in the eye which leads to a decrease in vision.

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MCQ 61 Mark

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

A
0.1%
✓
10%
C
100%
D
1%

Answer

Correct option: B.

10%

(b) 10%
Explanation:10%

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MCQ 71 Mark

Two LED bulbs of 10W and 5W are connected in series. If the current flowing through 5W bulb is 0.005A, the current flowing through 10W bulb is:

A
0.0025A
✓
0.005A
C
0.02A
D
0.01A

Answer

Correct option: B.

0.005A

(b) 0.005A
Explanation: The current in a circuit made up of a series of resistors is the same in every area of the circuit or is the same current flowing through every resistor.

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MCQ 81 Mark

A coil of many circular turn wrapped around a insulator forms a

✓
Solenoid
B
Bar magnet
C
Circular magnet
D
U-shaped magnet

Answer

Correct option: A.

Solenoid

(a) Solenoid
Explanation: A coil of many circular turn wrapped around a insulator forms a solenoid. It is mainly made of soft iron core as it loses the magnetism very easily on withdrawal of current.

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MCQ 91 Mark

In the experiment$,$ to show $CO_2$ is given out during respiration. Atul put boil gram seeds in a conical flask.According to his observation$,$ the water level in the bent tube:

A
Rises
B
Decreases
C
Rise or decreases in water level depends on the room temperature
✓
Remains the same

Answer

Correct option: D.

Remains the same

Remains the same because boiled gram seeds do not produce $CO_2$ gas.

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MCQ 101 Mark

In human males, all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are
i. large chromosome
ii. small chromosome
iii. Y-chromosome
iv. X-chromosome

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

Answer

Correct option: A.

(iii) and (iv)

(a) (iii) and (iv)
Explanation: Males have two distinct sex chromosomes (XY) and are called the heterogametic sex (Chromosome-23). Females have two of the same kind of sex chromosome (XX) (Chromosome-23) and are called the homogametic sex. In human males, all the chromosomes (22- Autosomes) are paired perfectly except one (23rd). These unpaired chromosomes are X and Y
(Chromosome-23).

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MCQ 111 Mark

The diagram shows a section through the male reproductive system. What is the function of part X?

i. The secretion of the gland neutralises acids from urine.
ii. It decreases the number of sperms damaged during ejaculation.
iii. It stimulates uterine contraction to help sperms move forward into the fallopian tube.
iv. Both (i) and (ii)

✓
Statement (iv) is correct.
B
Statement (iii) is correct.
C
Statement (ii) is correct.
D
Statement (i) is correct.

Answer

Correct option: A.

Statement (iv) is correct.

(a) Statement (iv) is correct.
Explanation: Gland X is Cowper's gland that is present in males. It secretes an alkaline fluid.

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MCQ 121 Mark

The statement that correctly describes the characteristic(s) of a gene is:

A
A gene is not the information source for making proteins in the cell.
✓
In individuals of a given species, a specific gene is located on a particular chromosome.
C
All the inherited traits in human beings are not controlled by genes.
D
Each chromosome has only one gene located all along its length.

Answer

Correct option: B.

In individuals of a given species, a specific gene is located on a particular chromosome.

(b) In individuals of a given species, a specific gene is located on a particular chromosome.
Explanation: In individuals of a given species, a specific gene is located on a particular chromosome.

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MCQ 131 Mark

As compared to daytime, the amount of carbon dioxide released by the plants during night is more because:

A
It is stored in the leaves of plants during daytime.
B
Plants do not respire during daytime.
C
It is not produced during daytime
✓
Major amount of carbon dioxide produced is used up for photosynthesis during daytime.

Answer

Correct option: D.

Major amount of carbon dioxide produced is used up for photosynthesis during daytime.

(d) Major amount of carbon dioxide produced is used up for photosynthesis during daytime.
Explanation: Major amount of carbon dioxide produced is used up for photosynthesis during daytime.

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MCQ 141 Mark

Which of the following represent the formula $C_6H_{14}$?

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

Answer

Correct option: C.

All of these

$A, B$ and $D$ are isomers of hexane they have the same molecular formula but different structural formulae. $C$ represents an isomer of pentane $C_5H_{12}$

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MCQ 151 Mark

Which of the following elements occurs in free state in nature?

A
Fe
B
Ni
✓
Pt
D
CO

Answer

Correct option: C.

Pt

(c) Pt
Explanation: Pt

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MCQ 161 Mark

Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes $I$ and $II$ by four students $\text{A, B, C}$ and $D$. Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours were recorded in the form of table as given below:

Student	Metal	Solution	Colour change of solution	Deposit/Coating obtained
$A$	$Fe$	$\ce{ZaSO_4}$	Turned green	Silvery grey coating
$A$	$Zn$	$\ce{FeSO_3}$	No change	No change
$B$	$Fe$	$7\Omega \ce{OO_4}$	No change	Black deposit
$B$	$Zn$	$\ce{FeSO_4}$	Colour faded	Grey coating
$C$	$Fe$	$\ce{ZnSO_4}$	No change	No change
$C$	$Zn$	$\ce{FeSO_4}$	Turned colourless	Black deposit
$D$	$Fe$	$\ce{ZnSO_4}$	No change	Grey deposit
$D$	$Zn$	$\ce{FcSO_4}$	No change	Black deposit

The correct reporting has been made in observations:

A
Student $A$
✓
Student $C$
C
Student $D$
D
Student $B$

Answer

Correct option: B.

Student $C$

$\ce{Fe + ZnSO_4}$ No reaction
It is because iron is less reactive than Zinc.
$\ce{Zn + FeSO_4} \rightarrow \ce{ZnSO_4 + Fe}$
The solution becomes colourless and black iron gets deposited.

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MCQ 171 Mark

Which of the following are not straight chain compounds?
A.$CH _3- CH _2- CH _2- CH _2- CH _3$
B.

C.

D.

A
A, B and D
✓
C and D
C
A and B
D
A and C

Answer

Correct option: B.

C and D

(b) C and D
Explanation: A and B are straight chain compounds. A has a straight chain of 5 carbon atoms. B has a straight chain of 7 carbon atoms. C and D are not straight chain compounds.

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MCQ 181 Mark

Bleaching powder is produced by the action of chlorine on

A
calcium chloride
B
calcium hydroxide
C
dry slaked lime
✓
moist slaked lime

Answer

Correct option: D.

moist slaked lime

Bleaching powder is manufactured $($prepared on a large scale$)$ by passing chlorine gas over dry slaked lime$: \ce{Ca(OH)_2 + Cl_2\rightarrow CaOCl_2 + H_2O}$

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MCQ 191 Mark

Chemically rust is:

A
Metal oxide
B
Ferric oxide
C
Ferrous oxide
✓
Hydrated ferric oxide

Answer

Correct option: D.

Hydrated ferric oxide

Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Chemically, rust is a hydrated ferric oxide $\ce{(Fe_2O_3. H_2O).}$

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MCQ 201 Mark

The food items like cheese that is shown in the given below image become unfit for eating. This happens due to:

A
Corrosion
B
Rusting
C
Dusting
✓
Rancidity

Answer

Correct option: D.

Rancidity

(d) Rancidity
Explanation: Rancidity spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating. Hence, the cheese shown in the image becomes unfit for eating due to rancidity.

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