NCERT Class VII Science Solutions: Chapter 4 – Heat Part 1

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Question 1:

State similarities and differences between the laboratory thermometer and the clinical thermometer.

Answer:

  1. Similarities:

  2. Working principle of both the thermometer is same.

  3. Both are used to measure temperature.

  4. Both have a thick walled glass tube enclosing a fine uniform bore capillary tube.

  5. Mercury is used in both thermometers to measure temperature.

  6. Both have Celsius and Fahrenheit markings.

  7. Differences:

  8. Laboratory thermometer is used to measure temperature of different objects in factories and laboratory where as clinical thermometer is used to measure the temperature of human beings only.

  9. Generally, laboratory thermometer has temperature range from −10℃ to 110℃ where as clinical thermometer has temperature range from 35℃ to 42℃.

  10. Usually laboratory thermometer does not have any constriction where as clinical thermometer has the small constriction near the mercury bulb.

  11. Laboratory thermometer has to be kept upright while taking the reading where as clinical thermometer can be tilted while taking reading.

As showing in images is a clinical thermometer and laborator …

Clinical Thermometer and Laboratory Thermometer

Question 2:

Give two examples each of conductors and insulators of heat.

Answer:

Conductors: Copper, aluminum and iron.

Insulators: Wood, water and air.

As showing in images is a conductors and insulator

Conductors and Insulator

Question 3:

Fill in the blanks:

  1. The hotness of an object is determined by its __________.

  2. Temperature of boiling water cannot be measured by a _____________ thermometer.

  3. Temperature is measured in degree ______________.

  4. No medium is required for transfer of heat by the process of __________.

  5. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ______________.

  6. Clothes of ______________ colours absorb heat better than clothes of light colours.

Answer:

  1. The hotness of an object is determined by its temperature.

  2. Temperature of boiling water cannot be measured by a clinical thermometer.

  3. Temperature is measured in degree Celsius.

  4. No medium is required for transfer of heat by the process of radiation.

  5. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction.

  6. Clothes of dark colours absorb heat better than clothes of light colours.

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