Science 7.docx

B.S.A. PUBLIC SCHOOL,BEGUSARAI Time- 2 hours

SUMMATIVE ASSESSMENT-II

Class- VII

F.M- 80

2018-19

Subject- Science

1.Choose and write the correct answer.

10x1=10

(i) The heart on an average beats _____. (a) 60 times/min

(b) 52 times/min

(c) 72 times/min

(ii) _____ reproduce by budding. (a) amoeba

(b) hydra

(c) Paramecium

(d) Spirogyra

(iii) The movement of sea-saw shows _____ motion. (a) Periodic

(b) Oscillatory motion (c) Vibratory

(d) random

(iv) A solenoid carrying current behaves like a/an _____. (a) magnet

(b) insulator

(c) electric bell (d) torch

(v) _____ is a fundamental atmospheric rate. (a) cyclone

(b) thunderstorm

(c) tornado

(d) wind speed

(vi) The power of a lens is expressed in _____. (a) meter

(b) centimetre

(c) dioptre

(d) kilometre

(c) 0°C

(d) 100°C

(vii) The density of water at max. is _____. (a) -4°C

(b) 4°C

(viii) The volume ratio of H and O in water is _____ (a) 1:8

(b) 8:1

(c) 1:2

(d) 2:1

(ix) _____ is a producer. (a) Herbivore

(b) Carnivore

(c) green plant

(d) Humans

(x) Biodegradable waste is _____. (a) dead plants

(b) plastic

(c) DDT

(e) none.

2. Write True or False:(i) Fruit plants propagate by grafting.

10x1=10 (ii) Movement of bullet is a mixed motion.

(iii) A current carrying wires behaves like a magnet. (iv) Tornado circles around high pressure area. (v) Angle of incidence is always greater than angle of reflection. sin 𝑖

(vi) The value of sin 𝑟 is always constant. (viii) Tanks are called sludge.

(vii) Water is denser than ice. (ix) Forests prevent soil erosion.

(x) The reverse osmosis can be used to purify water. 3. Filll in the blanks:-

10x1=10

(i) The human heart is made up of _____ chambers. (ii) _____ produced by Anther. (iii) Sundial is used to ______.

(iv) Voltaic cell is a _____ cell.

(v) A cyclone is also called a _____.

(vii) The freezing point of water is _____.

(vi) A lens thinner at center is called _____ lens.

(viii) Forests helps in regulating _____.

(ix) Last stage in sewage treatment is _____.

(x) Light always travels in _____.

4. Match the following:-

5x1=5

Xylem

No movement

Ampere

Non-biodegradable

Plastic

Single parent

Rest

Conductive tissue

Asexual reproduction

Current

5. Give examples:- (2 each)

5x1=5

(i) Asexual reproduction (modes) (ii) Conductive tissues (plants) (iii) Motion (types)

(iv) Waste management (modes)

(v) Destructive phenomena (natural). 6. Answer the following questions:(i) Define dialysis.

10x2=20

(ii) What is pollination.

(iii) Differentiate between periodic and non-periodic motion. (iv) What is electromagnet induction. (v) Why roofs get blown off during a storm. (vi) Write the laws of refraction.

(vii) Define eutrophication.

(viii) What is difference betwen a concave lens and convex lens. (ix) Write down steps to conserve forests. (x) Differentiate between biodegradable and non-biodegradable wastes. 7. What is heart? Explain in brief:-

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8. Describe the images formed by a convex lens.

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9. What is reverse osmosis? Explain how this process is used to purify water. 4 10. Define and explain the modes of asexual reproduction.

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11. Explain with the help of a diagram that how a sewage is treated.

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