Physics
Assertion (A): The density of water decreases when it is cooled from 4 °C to 0 °C.
Reason (R): Volume of water increases in cooling from 4 °C to 0 °C.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is false but reason is true
- Assertion is true but reason is false
Related Questions
A boy travels a distance 150 m in 1 minute. His speed is:
- 150 m s-1
- 2.5 m s-1
- 25 m s-1
- 9 m s-1
The density of a substance …………… with the increase in the temperature.
- increases
- decreases
- remains same
- none of the above
Fill in the blanks:
(a) 1 m3 = …………… cm3.
(b) The volume of an irregular solid is determined by the method of …………… .
(c) Volume of a cube = …………… .
(d) The area of an irregular lamina is measured by using a …………… .
(e) Equal masses of different substances have different …………… .
(f) The S.I. unit of density is …………… .
(g) 1 g cm-3 = …………… kg m-3.
(h) 36 km h-1 = …………… m s -1.
(i) Speed of a vehicle at a particular instant is shown by …………… .
Write true or false for each statement:
(a) The S.I. unit of volume is litre.
(b) A measuring beaker of capacity 200 mL can measure only the volume of 200 mL of a liquid.
(c) cm2 is a smaller unit of area than m2.
(d) Equal volumes of two different substances have equal masses.
(e) The S.I. unit of density is g cm-3.
(f) 1 g cm-3 = 1000 kg m-3.
(g) The density of water is maximum at 4°C.
(h) The speed 5 m s-1 is less than 25 km h-1.
(i) The S.I. unit of speed is m s-1.