Heat- 7th

Which one of the following is a reliable measure of heat?

• Hotness

• Coldness

• Temperature

• None of these

Heat always flows ___________.

• from a colder object to a hotter object

• from a hotter object to a colder object

• in both directions

• from a stationary object to a moving object

Paheli and Boojho measured their body temperature. Paheli found hers to be 98.6°F and Boojho recorded 37°C. Which of the following statements is true?

• Paheli has a higher body temperature than Boojho.

• Paheli has a lower body temperature than Boojho.

• Both have normal body temperature.

• Both are suffering from fever.

SI Scale of temperature is ___________.

• Celsius scale

• Kelvin scale

• Fahrenheit scale

• Reaumur scale

Small gaps are left between railway lines because ___________.

• rails of very long dimensions will shatter

• expansion of rails occurs during summer

• contraction of rails occurs during winter

• both (b) and (c)

Which of the following expands only in volume when heated?

• Solid

• Liquid

• Gas

• Both (b) and (c)

The extreme range of temperature in a day is measured using

• Celsius thermometer

• Fahrenheit thermometer

• maximum-minimum thermometer

• Kelvin thermometer

In case of ________ cool air moves from the land to the sea

Which of the following is a good conductor of heat?

• Iron

• Aluminium

• Steel

• all of these

A metal spoon is left in a pot of hot soup. After a few minutes, the handle of the spoon becomes hot. This is due to ____________

• Radiation

• Reflection

• Convection

• Conduction