M.C.Q. [1 M]

MCQ 11 Mark

Which one of the following is not a draught animal?

A
Horse
B
Elephant
C
Camel
✓
Sheep

Answer

Correct option: D.

Sheep

(d) Sheep
Explanation: Draught animals are used in agriculture and transportation. Camel, elephant, and horse all are used for

agriculture and transportation whereas sheep are not used for agriculture and transportation.

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MCQ 21 Mark

To prepare a colloidal solution of starch, we should:

✓
add the thin paste of starch to hot water with stirring
B
add starch powder to cold water and boil
C
add the starch powder to boiling water and cool
D
heat starch, add it to cold water and then bring it to boil

Answer

Correct option: A.

add the thin paste of starch to hot water with stirring

(a) add the thin paste of starch to hot water with stirring
Explanation: The colloid of starch is prepared by the dispersion method. 2-3 g of powdered/crushed starch is dissolved in 3-4

ml of water to make a thin paste. This paste is added to100 ml of boiling water while stirring. Allow the solution to cool and

filter. The filtrate is colloid of starch.

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MCQ 31 Mark

The substance which does not form a true solution in water is:

A
alum
✓
egg albumin
C
common salt
D
sugar

Answer

Correct option: B.

egg albumin

Egg albumin has a particle size of the order $10^{-9}$ to $10^{-12}$ i.e. of the order of colloidal size. Due to which it is not able to form a clear solution in water and results into a colloidal solution.

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MCQ 41 Mark

Which of the following are covered by a single membrane?

A
Mitochondria
✓
Vacuole
C
Nucleus
D
Plastid

Answer

Correct option: B.

Vacuole

(b) Vacuole
Explanation: Vacuole is a cavity within the cytoplasm of a cell, surrounded by a single membrane and containing fluid, food,

or metabolic waste. Mitochondria, Nucleus and Plastids are surrounded by double membrane.

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MCQ 51 Mark

The common characteristic of xylem tracheids and sieve tubes is that both are:

A
thick-walled cells
B
dead cells
C
living cells
✓
meant for conduction

Answer

Correct option: D.

meant for conduction

(d) meant for conduction
Explanation: Xylem is composed of tracheids, vessels, xylem parenchyma, and xylem fibres. Tracheids and vessels are tubular

structures and thus they provide a channel for conduction of water and minerals. Phloem is composed of sieve tubes,

companion cells, phloem fibre and phloem parenchyma. Sieve tubes are tubular cells with perforated walls. Sieve tubes are the

conducting elements of phloem.

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MCQ 61 Mark

An atom with 3 protons and 4 neutrons will have valency of

A
4
✓
1
C
7
D
3

Answer

Correct option: B.

(b) 1
Explanation: Atomic number = Number of protons = 3
Mass number = Number of protons + number of neutrons =3 + 4 = 7

Electronic configuration of the atom is 2,1(K,L)

Hence, its valency is 1.

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MCQ 71 Mark

The area below v-t graph is a measure of:

A
Angular speed
✓
Displacement
C
Angular acceleration
D
Acceleration

Answer

Correct option: B.

Displacement

(b) Displacement
Explanation: The area under the velocity-time graph gives the distance (magnitude of displacement) which has the unit is metre (m).

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MCQ 81 Mark

Four students A, B, C and D while performing an experiment on establishing the relation between the loss of weight of small solid when fully immersed in tap water, and the weight of water displaced by it, used four different shapes of overflow cans containing water as shown: The arrangement, that would given correct results is that of student:

A
A
B
B
C
C
✓
D

Answer

Correct option: D.

(d) C
Explanation: Water has to be filled to the level of overflow.

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MCQ 91 Mark

Roshini is making a temporary mount of onion peel. What precautions should be taken to avoid the entry of air bubbles in the slide?

✓
Coverslip should be gently dropped over the peel
B
Peel should be immersed in stain for over an hour
C
Peel should be allowed to fold over itself once or twice
D
Coverslip should be dropped on to the peel from a certain height

Answer

Correct option: A.

Coverslip should be gently dropped over the peel

(a) Coverslip should be gently dropped over the peel
Explanation: Precautions:
i. The staining of the peel must be appropriate. Excess stain can be removed by rinsing the peel with water taken in the watch glass.
ii. Always hold the slide by its edges to avoid making the slide dirty.
iii. Use a brush to transfer the peel to the slide.
iv. The peel should never be folded.
v. The peel should be mounted in the centre of the slide.
vi. Always keep the coverslip gently to avoid the entry of air bubbles.

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MCQ 101 Mark

$440 g$ of carbon dioxide can be represented as
$i. 5 g$ mole of carbon dioxide
$ii. 10$ moles of carbon dioxide
$iii. 6.023 \times 10^{23}$ molecules of carbon diaxide
$iv. 6.023 \times 10^{24}$ molecules of carbon diaxide.

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

Answer

Correct option: D.

$(ii)$ and $(iv)$ only

$44 g$ of carbon dioxide $=1$ mole of carbon dioxide
$=6.023 \times 10^{23}$ molecules of carbon dioxide
$440 g$ of carbon dioxide $=10$ moles of carbon dioxide
$=6.023 \times 10^{24}$ molecules of carbon dioxide

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MCQ 111 Mark

Following are a few definitions of osmosis read carefully and select the correct definition.

A
Movement of solvent molecules from its higher concentration to lower concentration
B
Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane
C
Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane
✓
Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane

Answer

Correct option: D.

Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane

(d) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane
Explanation: Osmosis is the passive movement of water or any other solvent molecules from a region of higher water

concentration to a region of lower water concentration through a semipermeable membrane.

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MCQ 121 Mark

Lignified, narrow, elongated and dead cells are found in

A
collenchyma
B
phloem
C
parenchyma
✓
sclerenchyma

Answer

Correct option: D.

sclerenchyma

(d) sclerenchyma
Explanation: Sclerenchyma tissue is dead simple permanent tissue of the plant. The cells of sclerenchyma are closely packed

without intercellular spaces, like tiles in the mosaic floor so that, it can provide the strength, rigidity, flexibility, and elasticity to

the plant to withstand various strains.

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MCQ 131 Mark

Irrigation ensures that the crops get water whenever they need it during growing season. Tube wells are surface water source of irrigation. They get water from porous soil strata. Canal system of irrigation draws water from rivers and is also related to generation of hydroelectricity. River lift system is advantageous in those areas where river water is easily available. Both canals and river lifts are groundwater sources of irrigation.
Select the correct option regarding this.

A
Canal should be replaced by tank.
✓
The positions of surface water and groundwater should be interchanged.
C
Soil strata should be replaced by river.
D
The positions of canal and river lift should be interchanged.

Answer

Correct option: B.

The positions of surface water and groundwater should be interchanged.

(b) The positions of surface water and groundwater should be interchanged.
Explanation: The positions of surface water and groundwater should be interchanged.

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MCQ 141 Mark

Usha swims in a 90 m long pool. She covers 180 m in one minute going either way. The average velocity is:

A
$30 ms^{-1}$
✓
zero
C
$180 ms^{-1}$
D
$90 ms^{-1}$

Answer

Correct option: B.

zero

(b) zero
Explanation: The average velocity for the entire swing would be zero because its final position and initial position are identical.

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MCQ 151 Mark

Take a clean glass slide and put few drops of water on it. Now place a complete Rheo leaf on water droplets and examine the cells of leaf under the high power of compound microscope. Put a few drops of concentrated salt/sugar solution on the mounted Rheo leaf on the glass slide. Wait for few minutes and again observe the leaf under the high power of microscope.
What will be your observation after few minutes?

A
Cytoplasm along with plasma membrane has come to lie on one side of cell wall.
✓
All of these
C
Cell contents are separated from the cell wall
D
A clear space is seen between the cell wall and protoplast of the cell.

Answer

Correct option: B.

All of these

(b) All of these
Explanation: Shrinkage of the protoplast of a plant cell from its cell wall under the influence of a hypertonic solution is called

plasmolysis. If we put a Rheo leaf in a concentrated salt/ sugar solution, it will cause exosmosis or withdrawal of water from

cytoplasm and then the central vacuole of cell. As a result, the size of cytoplasm as well as central vacuole decreases and hence

protoplast reduces. The plasma membrane gets withdrawn from the cell wall and a clear space is seen between the cell wall and

protoplast of the cell.

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MCQ 161 Mark

Which experiments set-up is correct for determining the melting pt. of ice?

A
Both P and Q
✓
Q
C
P
D
Neither P nor Q

Answer

Correct option: B.

(b) Q
Explanation: Q is correct arrangement of determination of melting point of Ice because its contains crushed ice cubes. In P ice

cubes added in place of crush ice, so its not correct arrangement of determination of melting point of Ice.

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Science M.C.Q. [1 M]

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