Selina solutions

Selina solutions

Grade 7

Heat | Objective Questions

Question 1

Q1) Write true or false for each statement

(a) on touching a lump of ice, we feel cold because some heat passes from our body to the ice.

(b) heat flows from a body at high temperature to a body at a low temperature when they are kept in contact.

(c) all solids expand by the same amount when heated to the same rise in temperature.

(d) telephone wires are kept tight between the two poles in summer.

(e) equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.

(f) solids expand the least and gases expand the most on being heated.

(g) a mercury thermometer makes use of the property of expansion of liquids on heating.

(h) kerosene contracts on heating.

(i) water is a bad conductor of heat.

(j) medium is necessary for the transfer of heat by radiation.

(k) land and sea breezes are convection currents of cold and warm air.

(l) liquids are heated by conduction and radiation.

(m) black surfaces are the poor absorbers of heat radiations.

Solution:

(a) true

(b) true

(c) false

(d) false

(e) true

(f) true

(g) true

(h) false

(i) true

(j) false

(k) true

(l) false

(m) false

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subject-cta

Question 1

Q1) Write true or false for each statement

(a) on touching a lump of ice, we feel cold because some heat passes from our body to the ice.

(b) heat flows from a body at high temperature to a body at a low temperature when they are kept in contact.

(c) all solids expand by the same amount when heated to the same rise in temperature.

(d) telephone wires are kept tight between the two poles in summer.

(e) equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.

(f) solids expand the least and gases expand the most on being heated.

(g) a mercury thermometer makes use of the property of expansion of liquids on heating.

(h) kerosene contracts on heating.

(i) water is a bad conductor of heat.

(j) medium is necessary for the transfer of heat by radiation.

(k) land and sea breezes are convection currents of cold and warm air.

(l) liquids are heated by conduction and radiation.

(m) black surfaces are the poor absorbers of heat radiations.

Solution:

(a) true

(b) true

(c) false

(d) false

(e) true

(f) true

(g) true

(h) false

(i) true

(j) false

(k) true

(l) false

(m) false

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subject-cta
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