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Published on: 27/08/2019
Heat
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Questions + Answers key
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1.
Cooking utensils are made of metals because they are:
Durable
Malleable
Good conductors of heat
Do not break on heating
2.
Heat is a form of:
Energy
Light
Electricity
Work
3.
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
copper bottom makes the pan more durable
such pans appear colourful
copper is a better conductor of heat than the stainless steel
copper is easier to clean than the stainless steel
4.
A wooden spoon is dipped in a cup of icecream, then its other end
becomes cold by the process of conduction
becomes cold by the process of convection
becomes cold by the process of radiation
does not become cold
5.
An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
flow from iron ball to water
not flow from iron ball to water or from water to iron ball
flow from water to iron ball
increase the temperature of both
6.
The three modes of heat transfer are radiation ________ and conduction.
7.
Heat flows from a _________ surface to________surface.
8.
__________ has highest specific heat.
9.
The thermometer used to measure human body temperature is called ______ thermometer.
10.
Temperature is the measure of _____ of an object.
11.
Marking on clinical thermometer is from 00C to 1000C.
12.
Water at higher temperature feels more hot.
13.
In all cases, heat flows from a hotter object to a colder object.
14.
Normal temperature of human body is 98.6°C.
15.
Our sense of touch about hotness or coldness is not always reliable
16.
Heat
17.
Hair and fur of animals
18.
Conductors
19.
Radiation
20.
Convection
21.
Name the three modes of transfer of heat.
22.
What is the SI unit of temperature.
23.
Which metal is used in the bulb of thermometer?
24.
Name another type of thermometer.
25.
What is clinical thermometer?
1.
(c)
Good conductors of heat
2.
(a)
Energy
3.
As copper is a better conductor of heat than the stainless steel. So, stainless steel pans are usually provided with copper bottom.
4.
It does not become cold because it is an insulator.
5.
As heat can only flow from higher temperature to lower temperature. Thus, the heat will not flow from iron ball to water or vice-versa.
6.
( )
convection
7.
( )
hotter, colder
8.
( )
water
9.
( )
clinical
10.
( )
hotness
11.
(b)
12.
(a)
13.
(a)
14.
(b)
15.
(a)
16.
( )
A form of energy
17.
( )
Poor conductor of heat
18.
( )
Metals
19.
( )
Requires no medium
20.
( )
Liquids
21.
( )
Conduction, convection and radiation.
22.
( )
Kelvin.
23.
( )
Mercury (Hg).
24.
( )
Celsius thermometer.
25.
( )
The thermometer which is used to measure our body temperature is called clinical thermometer.
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CBSE 7th Standard CBSE Subjects
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