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PODAR INTERNATIONAL SCHOOL, Revision Question Bank (2021-22), Std: VIII, , Subject: Science, , Section A, 1. Which of the following statement/s is/are incorrect?, Statement1: Coal has a large amount of stored energy., Statement 2: Peat, lignite, bituminous and anthracite are the four varieties of coal., (a), , Statement 2 is correct and statement 1 is incorrect, , (b), , Both statements 1 and 2 are incorrect, , (c), , Both statements 1 and 2 are correct, , (d), , Statement 1 is correct and statement 2 is incorrect, , 2. Study the given passage and answer the following question., The burning of fossil fuels such as coal and petroleum leads to the release of harmful, products into the environment. Natural gas is the cleanest burning fossil fuel. Some of, the harmful effects of burning of fossil fuels on the environment are global warming, air, pollution and acid rain., Which of the following is not an effect of global warming?, (a), , Freezing of the polar caps, , (b), , Rise in sea levels, , (c), , Flooding of coastal regions, , (d), , Increase in overall temperature of Earth, , 3. Study the given passage and answer the following question., The burning of fossil fuels such as coal and petroleum leads to the release of harmful, products into the environment. Natural gas is the cleanest burning fossil fuel. Some of, the harmful effects of burning of fossil fuels on the environment are global warming, air, pollution and acid rain., Natural gas is the cleanest burning fossil fuel because:, (a), , it does not release any by-product, , (b), , it releases fewer by-products than other fossil fuels, , (c), , it has low calorific value, , (d), , it does not release any greenhouse gas, , CB/VIII/2122, , Revision Question Bank 2, , page 1 of 3
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4. Sound cannot travel in a __________________., (a), , vacuum, , (b), , solid, , (c), , gas, , (d), , liquid, , 5. What type of image is formed on the retina of the human eye when light rays are, refracted by it?, (a), , virtual and erect, , (b), , real and inverted, , (c), , virtual and inverted, , (d), , real and erect, Section B, , 6. (a), , For question number (i) and (ii), two statements are given- one labelled, Assertion (A) and the other labelled Reason (R). Select the correct answer to, these questions from the codes (A), (B), (C) and (D) as given below:, A. Both A and R are true, and R is the correct explanation of the assertion., B. Both A and R are true, but R is not the correct explanation of the assertion., C. A is true, but R is false., D. A is false, but R is true., (i), , Assertion: Water should be not used to control fires involving electrical, equipment., Reason: Water conducts electricity., , (ii), , Assertion: Due to friction and heat, meteoroids are destroyed and form, meteors., Reason: Meteors are called shooting stars., , CB/VIII/2122, , Revision Question Bank 2, , page 2 of 3
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(b), , 7., , (a), , (b), , (c), , (i), , Define refraction., , (ii), , What do you mean by destructive distillation of coal?, , (iii), , Mars is called as the red planet. Give reason., , Calculate the number of images formed if two plane mirrors are placed at an, angle of 30o., (i), , Give one point of difference between inexhaustible and exhaustible, resources. Mention your answer in a tabular format., , (ii), , Moon has craters on its surface. Give reason, , (iii), , The high frequency or pitch of a baby’s voice is considered shriller than, an adult male. Justify., , Observe the figure of the human eye. Analyse the diagram and answer the, questions that follow:, , (i), , Name the labelled parts 1, 2, 3 and 4., , (ii), , Give the function of the part labelled as 3., , (iii), , Ramesh’s grandfather is suffering from an eye defect. His eye lens has, become cloudy, causing a blurred or dimmed vision., Identify the type of eye defect he is most likely suffering from. How can, this defect be corrected?, , >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>, , CB/VIII/2122, , Revision Question Bank 2, , page 3 of 3
