Class 7 Heat CBSE Questions & Answers

Class 7 · Heat

This is Science Class 7 Heat CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Boiling point of pure water at sea levels is -------- 0F.
  • A
    312
  • B
    98
  • C
    112
  • D
    212.0
    Correct
2
Mercury is a highly toxic element although it is used in thermometer because it
  • A
    Can be easily disposed
  • B
    It is easily visible and found in liquid state
  • C
    It has dark colour and melt at low temperature
  • D
    Has shining surface and expand uniformly
    Correct
3
A wooden spoon is dipped in cup of ice-cream, its other end
  • A
    Become cold by convection
  • B
    Become cold by conduction
  • C
    Does not become cold
    Correct
  • D
    Become cold by radiation
4
Woollen sweaters have small pore although, they keep us warm because pore contain
  • A
    Woollen is warmer in nature
  • B
    Air, which is bad conductor of heat
    Correct
  • C
    Air, which is good conductor of heat
  • D
    Moisture that keep us warm
5
In conduction
  • A
    Molecules are in contact of each other
    Correct
  • B
    Molecules are away from each other
  • C
    Can take place in air
  • D
    Molecules are not required
6
Hotness and coldness are
  • A
    Comparative to other object
    Correct
  • B
    Same as the hotter object
  • C
    Same as the colder object
  • D
    Same as surround
7
Clinical thermometer is used to measure the temperature of body because
  • A
    It is easily available in market
  • B
    It is smaller can be easily carried
  • C
    It contain mercury that expand uniformly
  • D
    It has kink and suitable temperature range
    Correct
8
Heat: Calorie :: Temperature : ?
  • A
    Kelvin
  • B
    Fahrenheit
  • C
    Watt
  • D
    Celsius
    Correct
9
We should wash the thermometer before use with antiseptic solution to
  • A
    Remove the coating of moisture
  • B
    Make the number visible
  • C
    Decrease the temperature
  • D
    Make it germ free
    Correct
10
S.I. unit of heat is
  • A
    Calories
  • B
    Watt
  • C
    Newton
  • D
    Joule
    Correct
11
We should avoid to keep the thermometer in sun or near the flame
  • A
    To prevent the range of thermometer
  • B
    To prevent from braking
    Correct
  • C
    To make it unsuitable for human use
  • D
    To prevent colour of mercury
12
Which of the following thermometer do not use mercury?
  • A
    Laboratory thermometer
  • B
    Fahrenheit thermometer
  • C
    Clinical thermometer
  • D
    Digital thermometer
    Correct
13
Land Breeze: Day:: Sea Breeze : ?
  • A
    Mid night
  • B
    Morning
  • C
    Noon
  • D
    Night
    Correct
14
If two containers of same metals, one having black bottom and other with white bottom, which will heat up early?
  • A
    None of these will get heated
  • B
    Both will heated together
  • C
    Containers with white bottom
  • D
    Containers with black bottom
    Correct
15
We feel more comfortable with dark coloured clothes during winter because
  • A
    Dark coloured clothes are very cool
  • B
    Dark coloured clothes reflects more heat
  • C
    Dark colured clothes absorbs more heat
    Correct
  • D
    Dark coloured clothes looks good