NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 8

EASY

7th Foundation

IMPORTANT

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The bimetallic strip made up of aluminium and copper, when heated bends in the direction shown here. Which metal expands more when the two are heated at the same temperature?

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Important Questions on Heat

EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 9

Read the given statements and select the correct option.
Statement 1: An iron ball at

35 ° C

is dropped in a mug containing water at

305.15 K

. Then the heat will flow from the water to the iron ball.
Statement 2: In convection, heated molecules of a liquid themselves move to carry heat from the hot region to the cold region.

EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 10

A thermos flask is a household item that is used to keep things warm or cold for a long time. What is the use of silvered wall in thermos flask?

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EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 11

Which of the following statement(s) is/are incorrect?
(i) Two thin woollen sweaters are warmer than a thick woollen sweater.
(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides.
(iii) The cable wires between two poles are left loose, because in summers the wires may not break on expanding.

EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 12

A saucepan is usually made up of two different materials, $P$ and $Q$ . Identify $P$ and $Q$ .

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EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 13

Which of the following statements is incorrect?

EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 14

Two glass test tubes are heated from two different places of the test tubes. In which test tube will all the water heat up first?

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EASY

7th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 7>Chapter 3 - Heat>EXERCISES>Q 15

A hot liquid is carefully poured into a beaker. The graph shows how its temperature changes as it cools towards room temperature. Which process(es) is/are taking place at region $X$ ?

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