Heat and it's effects

------------Colour absorbs most of the radiation

• Red

• Blue

• Black

• Green

------------------- is used for measuring body temperature by detecting/capturing the thermal radiation of body

• A. Infrared thermometer

• B. Clinical thermometer

• C. Thermal scanner

• D. Both A and C

Cool air moving from land to sea is known as

• Day breeze

• Sea breeze

• Cool breeze

• Land breeze

After sun set

• Sea cools faster than land

• land cools faster than sea

• both cools at the same rate

• None of the above

Which among the following heat transfer doesn't require any medium ?

• Conduction

• Convection

• Radiation

• Both A and C

two litres of water at 60 degree celsius mixed with two litres of water at 100 degree celsius. The final temperature of the mixture would be

• 50

• 110

• Between 60 and 100

• None of the above

A wooden spoon is dipped in a cup of ice cream. It's other end

• Becomes cold by the process of conduction

• Becomes cold by the process of convection

• Becomes cold by the process of radiation

• Does not become cold

Stainless Steel pans are usually provided with copper bottoms. The reason for this could be that

• Copper bottoms make the pan more durable

• Such pan appears colourful

• Copper is better conductor of heat than stainless steel

• Copper is easier to clean than the stainless steel

. 1 calorie is = ---------------- Joule

• 4184

• 4.184

• 418.4

• 41.54

Heat transfer from an electric heater is via

• Conduction

• Radiation

• Convection

• None of the above