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
When two objects are in direct contact, heat always flows from
  • A
    Colder to hotter
  • B
    Hotter to colder
    Correct
  • C
    Wet to drier
  • D
    Drier to wet
2
In weather report, daily temperature is measured with
  • A
    Maximum-minimum temperature
    Correct
  • B
    Weather thermometer
  • C
    Daily thermometer
  • D
    Day-night thermometer
3
The temperature of human body normally does not go below
  • A
    31\(^0{\text{C}}\)
  • B
    15\(^0{\text{C}}\)
  • C
    35\(^0{\text{C}}\)
    Correct
  • D
    25\(^0{\text{C}}\)
4
Heat flows from
  • A
    Any direction
  • B
    Hotter to colder region
    Correct
  • C
    Colder to hotter region
  • D
    Heat does not flows
5
Poor conductors are also called as
  • A
    Absorbers
  • B
    Insulators
    Correct
  • C
    Semiconductors
  • D
    Reflectors
6
The range of laboratory thermometer is
  • A
    -20\(^0{\text{C}}\) to 110\(^0{\text{C}}\)
  • B
    -15\(^0{\text{C}}\) to 110\(^0{\text{C}}\)
  • C
    -15\(^0{\text{C}}\) to 120\(^0{\text{C}}\)
  • D
    -10\(^0{\text{C}}\) to 110\(^0{\text{C}}\)
    Correct
7
The process by which heat is transferred from hotter end to colder end is called
  • A
    Conduction
    Correct
  • B
    Radiation
  • C
    Transduction
  • D
    Convection
8
The windows of house in coastal areas are made to face the sea to
  • A
    To get warm sea breeze
  • B
    All of these
  • C
    To see the beauty of sea
  • D
    To receive the cooler sea breeze
    Correct
9
Temperature of hot milk can not be measured by clinical thermometer because
  • A
    Hot milk have temperature higher than maximum range
    Correct
  • B
    Hot milk temperature is less than minimum range
  • C
    Clinical thermometer can not be used for liquid
  • D
    Clinical thermometer is used for body temperature only
10
Level of mercury change when come in contact of hotter object as
  • A
    Mercury is best conductor of heat
  • B
    Mercury expands on heating
    Correct
  • C
    Mercury contract on cooling
  • D
    Mercury melt due to heat
11
An iron ball at 40 degree is dropped in a mug containing water at 40 degree the temperature of water
  • A
    Increase
  • B
    Slightly increase
  • C
    Decrease
  • D
    Remain same
    Correct
12
One litre of water at 30\(^0{\text{C}}\) is mixed with one litre of water at 50\(^0{\text{C}}\) the temperature of mixture will be
  • A
    More than 30\(^0{\text{C}}\)
    Correct
  • B
    Less than 30\(^0{\text{C}}\)
  • C
    More than 50\(^0{\text{C}}\)
  • D
    Less than 50\(^0{\text{C}}\)
13
Heat is defined as
  • A
    Energy transferred between objects at different temperature
    Correct
  • B
    Degree of hotness or coldness
  • C
    Measure of average kinetic energy
  • D
    The equivalent to temperature
14
We feel more comfortable with dark coloured clothes during winter because
  • A
    Dark coloured clothes looks good
  • B
    Dark coloured clothes reflects more heat
  • C
    Dark colured clothes absorbs more heat
    Correct
  • D
    Dark coloured clothes are very cool
15
On absolute temperature scale, the freezing point of pure water at sea level is __________ K.
  • A
    215
  • B
    273.13
    Correct
  • C
    132
  • D
    173.15