Question

VI
$. Abimetallic strip consists of two strips of different metals, say one of brass and the other or , welde
together. When it is heated, why does it bend?
6. Give reason why
(i) Cloudy nights are warmer than the clear nights.
Time
(1) Sunlight is hot while moonlight is cool
Note
Answer the following questions in detail
A
1. The same quantity of heat supplied to the same amount of different substances does not necessarily
produce the same increase in their temperature. Why?
2. Since all objects are absorbing energy from their surroundings, why doesn't the temperature of all
objects keep increasing continuously?
3. When 50 calorie heat is supplied to 30 g of a substance, its temperature is observed to increase from 15°C
to 40°C. What is - (a) the specific heat of the substance. (b) its heat capacity?
4. A glass tumbler of mass 400 g at room temperature, say 20°C, is immersed into a tub of water maintained
at 80°C. If the temperature of the tumbler reaches that of the tub, how much heat does the tumbler absorb?
(Given: specific heat of glass 0.840 * 1000 J/kg"C).
5. What is the relation between Fahrenheit and Celsius degrees scale? How can they be converted into each
other?
ActivityTime
VII Group Discussion
Heating effect of Sun's radiation is causing greenhouse effect on the earth which is responsible for natural
imbalance. Discuss scientific aproaches to reduce greenhouse effect.
VIII Creative Activity
Look out in the Indian political map. In that mark out the places where land and see breezes take place, ie
which are near to water bodies. Note such places in your notebook.​

Answer 1

Answer:

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Explanation:

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