The container has two openings, p and Q. Which way th e smoke from an external source placed near P moves when it reaches P and leaves from Q. Give reason for your answer. .

Name the process by which we receive heat from the sun.

One Line Answer

We receive heat from the sun by the process of Radiation.

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Chapter 5: Heat and Energy - Transmission of Heat [Page 227]

Chapter 5 Heat and Energy
Transmission of Heat | Q 20 | Page 227

State the three units of temperature.

When a substance having mass 3 kg receives 600 cal of heat, its temperature increases by 10°C. What is the specific heat of the substance?

Explain, why are the taps left dripping in sub-zero temperatures during winter?

What do you mean by heat?

1 joule = 4.2 calorie
Is this relation correct?

What is the upper fixed point on the Celsius scale?

Convert 80 K temperatures on the Celsius scale.

One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be

Assertion (A): 0 °C = 273.16 K. For our convenience we take it as 273 K after rounding off the decimal.

Reason (R): To convert a temperature on the Celsius scale we have to add 273 to the given temperature.

Figure (a–d) shows the readings on four different thermometers. Indicate which of the reading shows the normal human body temperature?