Question

TICK THE CORRECT OPTION



1. Heat causes
(a)change of state
(b) change of temperature
(c) expansion
(d) all of these


2. Heat causes expansion because
(a) heat occupies space
(b)of increase in the movement of molecules
(c)matter tries to escape from the heat
(d)none of the above is true-it is not yet known why heat causes expansion.

3.Which of these will expand the most on heating
(a)gold
(b)water
(c)mercury
(d)air

4.Temperature is measured by expansion on heating.Expansion in which of these is most commonly used.
(a)solid
(b)liquid
(c)gas
(d)none of these

5.When you touch a cold object
(a)heat flows from your body to the object
(b)heat flows from the object to your body
(c) temperature flows from your body to the object
(d)temperature flows the object to your body

6.If overhead electric cables are being laid in summers, should they be tightened up, or left a little loose?​

Answer 1

Answer:

1)d,2) b or c3)b4)a,5)a,6) left little loose to allow expansion

Answer 2

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➡(1) (D)

➡(2)(B)

➡(3)(D)

➡(4)(B)

➡(5)(a)