Thursday, 14 August 2014

FILL IN THE BLANKS AND CHOOSE QUESTIONS ON HEAT ICSE BASED


QUESTIONS
I.FILL IN THE BLANK SPACES BY CHOOSING CORRECT WORDS FROM THE LIST GIVEN BELOW:
List: rollers, air, poor, solids, cubical, conduction, melting,sublime,condensation,expands,
1.       Convection cannot take place in-----------------------
2.       The Liquids and gases have only------------------------
3.       Bridges are mounted on ------------------------ to prevent their collapse.
4.       Shining bodies are -------------------------- absorbers of radiant heat.
5.       Radiant heat can easily pass through -------------------------------------------.
6.       A fixed temperature at which a solid changes into a liquid state is called ------------------------
Point.
7.       The process due to which a gas changes into a liquid state a t fixed temperature is called
---------------------------------
8.       A gaseous form of solid formed directly on heating is called -------------------
9.       Alcohol -------------------------- more than mercury.
10.   Solids get heated only by  ---------------------------------------

II. Choose the most appropriate answer.

1.  Heat energy produces a sensation of
a)Warmth b) coldness c) both warmth and coldness d) none of these
             2. During a day time the air becomes warm due to the process of
                     a) conduction b) Convection c) radiation d) expansion
            3. A loose woollen cloth keeps us warm in summer, because:
                     a) it produces large amount of heat
                     b)  it prevents heat radiation from body by conduction
                     c) it prevents heat radiation from body by convection
                     d) it prevents heat radiation from body by radiation
             4. Fastest mode of transmission of heat is
                     a) Conduction b) convection c) radiation d) None of these
             5.  Black surface are:
                     a) good absorbers of heat only
                     b) good radiators of heat only
                     c) Poor absorbers of heat
                     d) good absorbers and good radiators of heat
              6. A bimetallic strip is made of iron and Brass : when heated in a flame
                    a) the iron expands more than Brass
                    b) the brass expands more than iron
                    c) both iron and brass expands equal
                    d) none of these
              7. The only liquid at room temperature in which conduction is possible, is
                   a) water b) benzene c) alcohol d)mercury
                 
              8. A device in which heat losses are minimized due to conduction ,convection and radiation is
                   a) thermometer b) bimetallic strip c) thermos flask d) solar cooker