Physics
Assertion (A): A desert becomes extremely hot in day time and very cold at night.
Reason (R): Sand has high specific heat capacity.
- 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
Answer
assertion is true but reason is false
Explanation
Assertion (A) is true because deserts experience extreme temperatures because the surface heats up quickly during the day and cools down rapidly at night due to low specific heat capacity of sand, leading to very hot days and very cold nights.
Reason (R) is false because sand has a low specific heat capacity, which means it heats up and cools down quickly. This is why temperature changes in deserts are so extreme.
Hence, assertion is true but reason is false.
Related Questions
Two bodies A and B are of the same material but A has twice the mass of B. Both are heated up to the same temperature. Identify the correct statement ?
- Heat absorbed by A is half of that by B.
- Heat absorbed by A is equal to that by B.
- Heat absorbed by A is twice of that by B.
- Heat absorbed by A is four times that by B.
A large bucket of water at 40 °C and a small cup of water at 80 °C are kept on a table. Which of them has higher heat content ?
- The cup of water.
- The bucket of water.
- Both of them have an equal heat content.
- Cannot be said without knowing the mass of the water in each.
Write down the approximate range of temperature at which water boils in a pressure cooker.
Complete the following sentences:
- When ice melts, it's volume ……………
- Decrease in pressure over ice …………… it's melting point.
- Increase in pressure …………… the boiling point of water.
- A pressure cooker is based on the principle that boiling point of water increases with the ……………
- The boiling point of water is defined as ……………
- Water can be made to boil at 115°C by …………… pressure over it's surface.