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Heat Flow and Temperature (Class VII)

Heat Flow and Temperature

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Temperature is the degree of hotness or coldness of a body. The S.I. unit of temperature is

  1. ampere
  2. joule
  3. degree Fahrenheit
  4. degree Celsius
  5. watt
Question 2 Multiple Choice (Single Answer)

The range of a common thermometer used in laboratories is between

  1. - 10 degree C and 110 degree C
  2. 10 degree C and 100 degree C
  3. - 10 degree C and 10 degree C
  4. 0 degree C and 100 degree C
  5. - 110 degree C and 110 degree C
Question 3 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. It is the flow of heat energy into our body that makes us feel hot or warm.
b. The energy transferred from one body to another body due to a temperature difference between them is called heat.
c. The human sensation of touch is very reliable to find the degree of hotness or coldness of a body.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 4 Multiple Choice (Single Answer)

The substances that allow heat energy to flow through them easily are called good conductors. Which of the following is a good conductor of heat?

  1. Plastic
  2. Glass
  3. Mica
  4. Mercury
  5. Ebonite
Question 5 Multiple Choice (Single Answer)

In which of the following medium(s) is convection not possible?

a. Liquid
b. Solid
c. Gases

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 6 Multiple Choice (Single Answer)

The radiant heat is a kind of electromagnetic energy. It travels in space at a speed of

  1. 3 x 104 m/s
  2. 3 x 105 Km/sec
  3. 3 x 106 Km/sec
  4. 3 x 108 m/sec
  5. 3 x 105 m/sec
Question 7 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Radiation is the fastest mode of heat transfer from a hot body to a cold body.
b. The process by which impure and warm air inside a room is continuously replaced by fresh air from outside is called ventilation.
c. Good conductors help in the conservation of energy in a system.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 8 Multiple Choice (Single Answer)

One feels more comfortable to wear white or light coloured clothes in hot summers because light coloured clothes are

  1. poor absorbers and poor radiators of heat
  2. poor absorbers, but good radiators of heat
  3. good absorbers and good radiators of heat
  4. good absorbers, but poor radiators of heat
  5. None of these
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Conduction starts once the two objects or the parts of the same object have attained the same temperature.
b. Cooling coils of air conditioners are made of copper as they readily conduct away heat.
c. Heat energy does flows through bad conductors, but at a very small rate as compared to good conductors.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 10 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Maximum and minimum temperatures of the previous day, reported in weather reports are measured by a thermometer called bimetallic thermometer.
b. A thermometer that is used by doctors to measure temperature of his patients is known as clinical thermometer.
c. The thermometer that consists of a very fine glass tube having a very small bore called a capillary tube.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 11 Multiple Choice (Single Answer)

Celsius thermometer cannot measure higher temperatures like that of a candle flame because in that case,

  1. the thermometer will break due to excessive contraction of the mercury
  2. the thermometer will break due to excessive expansion of the mercury
  3. the thermometer will break due to the glass of thermometer getting too hot
  4. the thermometer will break due to the freezing of mercury
  5. the thermometer will break due to the melting of the capillary tube
Question 12 Multiple Choice (Single Answer)

Which of the following requires no medium to travel?

a. Conduction
b. Convection
c. Radiation

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 13 Multiple Choice (Single Answer)

Which of the following is not a precaution that should be observed while reading the laboratory thermometer?

  1. The temperature should be read keeping the line of sight in level of the mercury.
  2. The bulb of the thermometer should not touch the side or the base of the container.
  3. The stem of the thermometer should be completely dipped in the liquid.
  4. The thermometer should be kept upright.
  5. The bulb of the thermometer should be completely surrounded by the liquid.
Question 14 Multiple Choice (Single Answer)

Which of the following is the best conductor of heat?

  1. Silver
  2. Copper
  3. Aluminium
  4. Gold
  5. Iron
Question 15 Multiple Choice (Single Answer)

Match the following:

 
a. Conduction 1. It is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium.
b. Convection 2. It is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium.
c. Radiation 3. It is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium.
  1. a - 2, b - 3, c - 1
  2. a - 2, b - 1, c - 3
  3. a - 1, b - 2, c - 3
  4. a - 1, b - 3, c - 2
  5. a - 3, b - 1, c - 2
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