Class 7 Science

Sample Paper - 2

MAX. MARKS: 80                                                                                                                               DURATION:  2½ HRS

General Instructions:          

(i) All questions are compulsory.

(ii) This question paper contains 23 questions divided into four Sections A, B, C and D.

(iii) Section A comprises 3 Questions (Fill in the Blanks, Multiple choice questions and True and False) of 20 marks.

(iv) Section B comprises 8 questions of 2 marks each.

(v) Section C comprises 8 questions of 3 marks each.

(vi) Section D comprises 4 questions of 5 marks each.

 

Question 1:

FILL IN THE BLANKS:                                                          (1 x 10 = 10)

1. The food synthesised by plant is stored as__________.

2. The largest gland in the human body is____________.

3. No medium is required for transfer of heat by the process of __________.

    4. When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.

5. A place receives very little rainfall and the temperature is high throughout the year, the climate of that place will be ___________ and ___________.

6. Near the earth’s surface __________air rises up whereas ___________ air comes down.

7. The main excretory product in human beings is________.

8. A flower may have either male or female reproductive parts. Such a flower is called_____________.

9. The safety device based on the heating effect of electric current is called a __________.

10. An image that cannot be obtained on a screen is called ____________.

 

Question 2:

Choose the correct answer:

1. When the switch is in the ________ position, the circuit is complete.

(a) off

     (b) on

(c) half on

(d) none of the above

 

2. Fat is completely digested in the

(a) stomach

     (b) mouth

(c) small intestine

(d) large intestine

 

3. A virtual image larger than the object can be produced by a

(a) concave lens

     (b) concave mirror

(c) convex mirror

(d) plane mirror

 

      4. The plant which traps and feeds on insects is:

(a) Cuscuta

     (b) china rose

(c) pitcher plant

(d) rose

 

5. A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in

(a) polar regions

    (b) deserts

(c) oceans

(d) tropical rainforests

 

Question 3:

     1. Iron and rust are the same substances.

2. Plants which synthesise their food are called saprotrophs.

3. The size of the chest cavity increases during inhalation.

     4. We can obtain a real, enlarged and inverted image by a concave mirror.

5. Indicator is a substance which shows different colours in acidic and basic solutions.

 

Section – B (2 marks each)

Question 4:

Name the following:

(a) A parasitic plant with yellow, slender and branched stem.

    (b) A plant that is partially autotrophic.

 

Question 5:

Describe the process of neutralisation with the help of an example.

 

Question 6:

________ is the point of attachment of the leaf at the node.

 

Question 7:

Classify the changes involved in the following processes as physical or chemical changes:

(a) Photosynthesis

(b) Dissolving sugar in water

(c) Burning of coal

(d) Melting of wax

     (e) Beating aluminium to make aluminium foil

(f) Digestion of food

 

Question 8:

Explain why holes are made in hanging banners and hoardings.

 

Question 9:

A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

 

Question 10:

State two differences between a convex and a concave lens.

 

Question 11:

Name two chemicals used to disinfect water.

Section – D (3 marks each)

Question 12:

Why does an athlete breathe faster and deeper than usual after finishing the race?

 

Question 13:

State similarities and differences between the laboratory thermometer and the clinical thermometer.

 

Question 14:

Does transpiration serve any useful function in the plants? Explain.

 

Question 15:

Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

 

Question 16:

Describe how crystals of copper sulphate are prepared.

 

Question 17:

What are decomposers? Name any two of them. What do they do in the forest?

 

Question 18:

Give two reasons for excessive currents in electrical circuits.

 

Question 19:

Why do organisms take food?

 

Section – D (5 marks each)

Question 20:

Explain why:

(a) An antacid tablet is taken when you suffer from acidity.

(b) Calamine solution is applied on the skin when an ant bites.

(c) Factory waste is neutralised before disposing it into the water bodies.

OR

(a) How does a Bryophyllum reproduce?

(b) Name some plants in which the roots can also give rise to new plants.

 

Question 21:

What are stomata? Give two functions of stomata.

OR

What are the components of blood?

 

Question 22:

Describe the function of the heart.

 

Question 23:

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

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