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CBSE 7th Standard Science Water: A Precious Resource Model Questions Papers Study Material - QB365 Set C

Published on: 31/10/2025

Question Set C

CBSE 7th Standard Science Water: A Precious Resource Model Questions Papers Study Material - QB365

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Std: 7th Standard CBSE - Science

chapter: Water: A Precious Resource - Model Questions Papers

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Questions:

Generic 3

5 x 3 = 15

Some definitions are given which can be corrected by changing one word. Correct them.
(a) Aquifer is groundwater stored between layers of hard rock above the water table.
(b) The process of evaporation of water in the ground is called infiltration.
(c) The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.

Observe the given diagram of human respiratory system. List the organs from (A) to (G).

Differentiate between a uniform and non-uniform motion.

How would you test the presence of starch in leaves?

Generic 5

3 x 5 = 15

Water is very precious for all the living beings. What will happen in future, if we do not save water now?

Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness both of them connected with wires as shown in the circuit given in figure. The current flowing in both the circuits is the same.
(a) Will the heat produced in both the cases be equal? Explain.
(b) Will the heat produced be the same, if the wires taken by them are of equal lengths but of different thickness? Explain.

List some animals around you. Now group them as follows:
(a) Animals that can breathe only through skin.
(b) The animal that can breathe through skin as well as through lungs.
(c) The animal that can breathe through lungs.
(d) Animals that can breathe through gills.
(e) Animals that can breathe through spiracle and tracheae?

Multiple Choice Question

6 x 1 = 6

Distance is a

(a)

Vector quantity

(b)

Scalar quantity

(c)

Both (a) and (b)

(d)

None of these

10.

Algae is:

(a)

Parasite

(b)

Saprotroph

(c)

Autotroph

(d)

None of these

11.

Which of the following characteristic is most suitable material for making the care of an electromagnet?

(a)

Brass

(b)

Aluminium

(c)

Iron

(d)

Steel

12.

Choose the correct option. The total water

(a)

in the lakes and rivers of the world remains constant

(b)

under the ground remains constant

(c)

in the seas and oceans of the world remains constant

(d)

of the world remains constant

13.

Two students were asked to plot a distance-time graph for the motion described by Table A and Table B.

**Table A**
Distance moved (m)	0	10	20	30	40	50
Time (min)	0	2	4	6	8	10

**Table B**
Distance moved (m)	0	5	10	15	20	25
Time (min)	0	1	2	3	4	5

The graph given in figure is true for:

(a)

Both A and B

(b)

Only A

(c)

Only B

(d)

Neither A nor B

14.

Spiracles on the body of insect are connected to a network of thin air tubes called

(a)

lungs

(b)

tracheae

(c)

gills

(d)

blow holes

1 Marks

4 x 1 = 4

15.

What are the main respiratory organs in humans?

16.

Which property of a conducting wire is utilised in making electric fuse?

17.

What is water table?

18.

What are Nutrients?

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Answers Key:

Generic 3

5 x 3 = 15

(a) Aquifer is groundwater stored between layers of hard rock below the water table.
(b) The process of seeping of water in the ground is called infiltration.
(c) The evaporation of water from oceans and its arrival back into oceans is called water cycle.

Since the magnetic effect directly depends on the number of turns of the coil. As, Paheli's coil has more number of turns than Boojho. So, her electromagnet is stronger than Boojho.
So, electromagnet of Paheli attracts more pins as compared to Boojho.

The human respiratory system have following organs:
A- Ribs
B- Trachea
C- Pharynx
D - Diaphragm
E- Lungs
F- Nasal passage
G- Oral cavity

When a body travels equal distance in an equal interval of time, then the body is said to be in a uniform motion.
When a body travels unequal distance in an equal interval of time, then the body is said to be in non-uniform motion.

The presence of starch, a carbohydrate in leaves can be tested by iodine test. Iodine turns starch solution into blue-black colour. Pour few drops of dilute iodine solution on a boiled leaf. The leaf becomes blue-black in colour which proves the presence of starch in it.

Generic 5

3 x 5 = 15

Water is needed for various life activities. If we continue the misuse of water and do not conserve it, the groundwater level will be depleted. This may result into various consequences like
(i) Lowering of the water table Excessive pumping can lower the groundwater table.
(ii) Reduced surface water supply Groundwater and surface water are connected. When groundwater is overused, the lakes, streams and rivers connected to groundwater, can also have little supply.
(iii) Loss of plants from land We fully depend on the plants for food directly or indirectly. Plants need water to prepare their food. If there will be scarcity of water on earth, the plants will be unable to prepare their food. This inturn will lead to the end of the life because world without plants means no food, no oxygen, not enough rain and other innumerable problems. Therefore, it is true that water is a precious resource

(a) No, the amount of heat produced in both the wires will be different because amount of heat produced in a wire on passing electric current depends on the length of wire and here length is different for both the wires.
(b) No, the amount of heat produced in the wire of same length but different thickness cannot be same because amount of heat produced in a wire also depends on the thickness of the wire.

(a) Animals that can breathe only through skin are earthworm and leech.
(b) Animals that can breathe through skin as well as through lungs are frogs.
(c) Animals that can breathe through lungs are buffaloes, human, and dolphins.
(d) Animals that can breathe through gills are tadpole and fish.
(e) Animals that can breathe through spiracles and tracheae are grasshopper, cockroaches, ants, housefly and mosquito.