Warm Air and Cool Air
Trending Questions
As the temperature of the gas increases, the volume occupied by the gas:
Increases
Decreases
Can’t be said
Remains constant
Question 20
Describe an activity to demonstrate that warm air is lighter than cool air.
How does Charles Law Affect The Human Body?
Molecules at a higher temperature have more energy.
True
False
Question 9
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in Figure.
Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.
Question 16
Match Column I with Column II. There can be more than one match.
- Warm air is lighter than cold air.
- Warm air rises up.
- Cold air descends.
- Cold air is lighter than warm air.
Why does density of a substance decrease with increase in temperature ?
Mass of an object remains same irrespective of the surroundings.Give reason.Why?
Supriya while doing an experiment in a science laboratory keep a laboratory thermometer 'p' 10 cm above from the flame of the candle .Her friend Riya kept the similar thermometer 'Q' 10 side from the flame of the candle .
In which thermometer 'p'or 'q'the rise in temperature will be faster give reason for your answer
Why is the air inside a hot-air balloon heated?
With the increase in kinetic energy of the air molecules, the tendency to occupy space by those air molecules will _____________.
decrease
become zero
increase
remain the same
Monsoons are not caused in torrid or frigid zone why
When hot air rises up from a region, the region becomes:
High pressure region.
- Independent of pressure.
Low pressure region.
Independent of temperature.
What do you understand by the term ventilation?
The kinetic energy of the air particle increases if we increase its speed.
- False
- True
- Due to heating, air contracts. When same mass occupies less volume it becomes lighter.
- Due to heating, the pressure of air decreases and air with lower pressure is lighter than air with higher pressure.
- Due to heating, air expands. When same mass occupies more volume it becomes lighter.
- Due to heating, the pressure of air increases and air with higher pressure is lighter than air with lower pressure.
- If wind flows from land to the ocean, then it is daytime.
- A very high pressure system, with very high speed wind surrounding it forms a cyclone.
- The coast line of India is not vulnerable to cyclones.
- Warm air is lighter than cool air.
- True
- False
Question 4
You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Statement 2: Cold air is lighter than hot air.
- Both statements are false.
- Both statements are true.
- Statement 2 is true and statement 1 is false.
- Statement 1 is true and statement 2 is false.
The boiling point of water is 212 °F. Express it in celsius and kelvin.
[NCERT]
- In winter the winds flow from the land to the ocean.
- In summer the winds flow from the land towards the ocean.
- A cyclone is formed by a very high-pressure system with very
high-speed winds revolving around it. - The coastline of India is not vulnerable to cyclones.
Question 17
Paheli kept an empty bottle made of plastic inside a refrigerator. After few hours, when she opened the refrigerator she found the bottle had collapsed. Explain the possible reason.
Question 9
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in Figure.
Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.
- The balloon will stay unaffected
- The balloon will deflate
- The balloon will inflate
- Anything can happen.
Near the earths surface _____ air rises up whereas ______ air comes down.
