Page 144 - Genius Kidz Prudence Learning Sc-8

TEST PAPER - 2
TEST PAPER - 2
(BASED ON CHAPTERS 9-16)

1. Short answer type questions.
(a) What is a streamlined body? How is it helpful for a body to have such a shape?
(b) How are echoes used in medicine?

(c) What would you expect in the following cases?
(i) A glass rod rubbed with a piece of silk is brought near a negatively charged paper cylinder.

(ii) A negatively charged body is brought in contact with the disc of a positively charged
electroscope.

(iii) Someone touches the disc of a negatively charged electroscope.
(d) Where do we apply the force while walking?

(e) Does force of gravity act on dust particles?
(f) Two thermocol balls held close to each other move away from each other, when they are released.
Name the force responsible for this phenomenon and explain as well.

2. Find out the wrong statements and write them in their correct form.
(a) We can survive for some time without air but we cannot survive even for a few minutes without
food.

(b) A brick kiln emits lot of smoke and other harmful gases causing air pollution.
(c) Carbon monoxide is produced by complete burning of fuels such as coal, petrol, diesel.
(d) Chlorination is a commonly used chemical method for killing germs in water.

3. Complete the following.
(a) In the electrolysis of water, hydrogen is formed at the _____________ .
(b) In the electrolysis of potassium iodide, iodine is formed at the _____________ .

(c) A person suffering from _____________ cannot see nearby objects clearly.
(d) The leading cause of blindness is _____________ .
(e) Ganymede, the largest moon of the solar system, is even larger than the planet _____________ .

(f) The giant planets of our solar system are made up mainly of _____________ .
(g) The tectonic plates move continually on the _____________ .

4. Long answer types questions.

(a) With the help of a diagram describe the gold leaf electroscope.
(b) What conditions make life possible on earth?
(c) What do you mean by comet. How is its tail formed?

(d) If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is
brought in contact with it, will there be any effect on the aluminium strips? Explain.
(e) How is sound produced and how is it transmitted and heard by us.
(f) What precautions you should take while you are inside your room and you experience sudden
shaking of the ground.

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