QuestionKart - Questions

cds- Question :

Assertion (A): Water in an open pond remains cool even on a hot summer day.

Reason (R): Water on heating evaporates and heat energy gets converted into latent heat.

A :

Both the statement are individually true and statement 2 is correct explanation of statement 1

B :

Both the statements are individually true but the statement 2 is not the correct explanation of statement 1

C :

statement 1 is true but its statement second is false

D :

the statement one is false but statement second is true

cds- Question :

Which one of the following is an example of chemical change?

A :

(a) Burning of paper

B :

(b) Magnetization of soft iron

C :

D :

(d) Preparation of ice cubes from water

cds- Question :

A close bottle containing water at room temperature was taken to the Moon and then the lid is opened The water will

A :

freeze

B :

boil

C :

decompose into oxygen and hydrogen

D :

not change at all

cds- Question :

Water is a good coolant and is used to cool the engines of cars,buses, trucks, etc. It is because water has a

A :

high specific heat

B :

low surface tension

C :

high boiling point

D :

low expansivity

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