Question

Date:
Page No
LIONS PUBLIC SCHOOL
SUB-SCIENCE
CLASS- 7 (2019-20
REVISION ASSIGNMENT-2
A. Tick the correct option:-
1) Shining surfaces are:
a) good absorbers of heat
c) poor absorber and radiato
b) good radiators of heat
d) good absorbers and radiators
2) The fastest mode of transfer of heat from a hot body to a cold body is ?
a) conduction b) convection c) radiation d) induction
3) A device in which heat loss due to conduction, convection and radiation is minimized is:
a) solar cooker b) thermos flask c) thermometer d) electric heater
​

Answer 1

Answer:

1)"C"

   SHINING SURFACES LIKE ICE ARE GOOD REFLECTORS/RADIATORS

   BUT DARK SURFACES LIKE RAIN FORESTS ABSORB A GOOD AMOUNT                  

   OF HEAT

2)"C"

   RADIATION OCCURS IN SPEED OF LIGHT

3)"B"