8/10/2019 CBSE Class 7 Science Sample Paper SA2 2014

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SCIENCE

Time : 3 hrs. Class VII M.M. : 100Date 24.2.2014

General Instructions: Read the question paper carefully.

Draw neat and labelled diagrams wherever necessary Attempt the questions in serial order.

Q.1 Fill in the blanks with appropriate words. (16=6)a) Wool has a __________ tensile strength.b) A long wire has __________ resistance than a short wire.c) A magnifying glass is a __________ lens.d) The dark radiating rows under the head of a mushroom are called __________.e) A __________ tank allows the water to seep into the soil and recharge ground

water.f) Underground pipes that carry waste water are called __________.

Q.2 Choose the correct option. (16=6)a) Quinine is obtained from the bark of -

i) chincona ii) eucalyptusiii) Tulsi iv) Kikar

b) The smallest particle of soil are called

i) silt ii) sandiii) clay iv) gravel

c) Rose and lemon are grown from i) tubers ii) bulbsiii) stem cuttings iv) leaf buds

d) On mixing the light of colours of rainbow, we will get -i) pink light ii) brown lightiii) colourless light iv) black light

e) To make a battery of 9 volts, how many 1.5V cells are needed ?i) 6 ii) 3 iii) 5 iv) 4

f) Rusting takes place in -i) air and moisture ii) air free moistureiii) moisture free air iv) none of these

Q.3 Name the following. (16=6)a) The process of obtaining silk from silk moth.b) One device that uses the heating effect of electric current.c) A mirror in which the reflecting surface bulges out.d) Tiny cells protected by a wall and capable of producing new plants.e) Soil found in the fertile plains of Punjab and Uttar Pradesh.f) Process of eating and being eaten.

Q.4 Give reasons for the following. (any three) (23=6)a) Rain water should be carried out by underground sewer.b) A bulb get warmer than the wires that connect it to a battery.

c) Soft iron core is used in an electromagnet.d) Burning of candle is a physical as well as chemical change.

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8/10/2019 CBSE Class 7 Science Sample Paper SA2 2014

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Q.5 Define the following terms. (any five) (25=10)a) Chemical changes b) Refraction c) Focus of lens d) Water table e) Extinct f) Secondary sludge

Q.6 Answer the following questions in not more than 20 words. (any six) (26=12)a) How do forests check pollution? b) How do changes in temperature help in weathering rocks? c) Why do seeds need to be dispersed? d) Write two properties of the image formed by a plane mirror. e) Draw the symbols for the following :

cell, bulb, battery, switch (open) f) What do you mean by throwing of silk? g) State two uses of a convex lens.

Q.7 Answer the following questions in not more than 40 words. (any six) (36=18)a) Discuss why the dissolving of salt in water is a physical change.b) What is a circuit diagram? Draw the circuit diagram of a torch working

on three cells.c) What is an electromagnet? Write two properties of an electromagnet.d) Why is the image formed by a pinhole camera inverted?e) What are the special features of wind-pollinated flowers?f) What about the pattern of rainfall in our country that leads to scarcity of

water? Which part of country gets rainfall twice a year?g) Write one way of overcoming the problem of lack of sewage systems in

villages.Q.8 Answer the following questions in not more than 100 words. (any five) (55=25)

a) What are the advantages and disadvantages of sandy and clayey soils?b) Distinguish between self pollination and cross pollination. How is pollen

from other flowers prevented from reaching the stigma of a self-pollinatedflower?

c) Describe the features of fruits and seed dispersed by animal and wind.d) What are real and virtual images? What are the differences between them?e) Explain with the help of a diagram, the construction and working of an

electric bell.f) Discuss moulting in silkworms. What is raw silk and spun silk?g) What is a fuse? How does it works?

Q.9 Draw well labelled diagram of any two of the following. (32=6)a) Layers of the soil b) Stages of sewage treatmentc) Biogas plant

Q.10 Look at the diagram given below and answer the questions thatfollow.

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a) Label the parts numbered 1-5.b) What do you mean by pollination?c) Which parts of flower develops

into fruit and seed?d) Give one example of a complete

flower.

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