Question 1

When a fluid is heated, it expands and becomes

Accepted Answer

On heating, the fluid expands and occupies more space. When the same amount of fluid occupies more space, it becomes lighter. The warmer fluid is, therefore, lighter than the colder fluid.

Question 2

Which of the following expands most of heating?

Accepted Answer

Because of the less force of attraction between the molecules, gases when heated expand the most because they need less energy to break the bonds.

Question 3

Sea breeze, a local wind system characterized by a flow from sea to land

Accepted Answer

Local wind system characterized by a flow air. When the air flow from sea to land during day time is called Sea breeze and when air flow from land to water/sea at night is called Land breeze.

Question 4

By what sign can an approaching cyclone be identified?

Accepted Answer

Strong winds push water towards the&#10;shore even if the storm is hundreds of&#10;kilometres away. These are the first&#10;indications of an approaching cyclone.&#10;The water waves produced by the wind&#10;are so powerful that a person cannot&#10;overcome them.&#10;The low pressure in the eye lifts&#10;water surface in the centre. The rising&#10;water may be as high as $3-12$ metres. It appears like a water-wall&#10;moving towards the shore. High-speed winds accompany a&#10;cyclone.

Question 5

During a cyclone, air moves from :

Accepted Answer

The correct answer is option (A).We know when there is difference in atmospheric pressure, air moves from the higher to the lower pressure area, resulting in winds of various speeds. Hence during a cyclone, air moves from region of high pressure to low pressure.

Question 6

When a substance is heated, its density

Accepted Answer

As a substance is heated, its volume increases, and thus its density decreases.Option B.

Question 7

Which of the following will rise the highest?

Accepted Answer

In hot air, the particles have higher kinetic energy and hence less density, so the air with the highest temperature will rise the highest.Therefore, air at $40^oC$ will rise the highest.

Question 8

Wind currents are generated due to:

Accepted Answer

The correct answer is option(A).We know poles are cooler than equator as highest intensity of the sun's heat and light falls on the equator and it reduces as we go either side of the equator towards the poles. Cooler air from the surrounding areass of the equator comes towards the equator to fill the place of warm air which rises up due to sun's heating. Hence, wind currents are generated due to uneven heating.

Question 9

Suppose you are in a car and it is raining heavily with thunderstorms. Then what is the best way to protect yourself from a possible thunder storm fall?

Accepted Answer

Answer is option(A).The lightning charge goes around the outside of the vehicle, creating a Faraday effect and protecting the occupants inside. However the occupant should not touch the interior metallic areas on a vehicle,The car provides protection from lightning, as the metal frame directs lightning currents to the ground, but vehicle can be damaged. Lightning damage to a car includes pitting, arcing and burning along with electrical system issues.Rubber tires being insulator keep it from being grounded, which lessens the possibility that your car would get striked.If your car had anything metal making direct contact with the earth, it would be more grounded, the more contact the more grounded.Hence it is better to remain in car during thunderstorm fall.

Question 10

Which of the following is the first sign of an approaching cyclone?

Accepted Answer

Cyclones can be very destructive. Strong winds push water towards the shore even if the storm is hundreds of kilometers away. These are the first indications of an approaching cyclone. The water waves produced by the wind are so powerful that a person cannot overcome them.

Winds Storms And Cyclones

Physics
3521 Views

When a fluid is heated, it expands and becomes

Which of the following expands most of heating?

Sea breeze, a local wind system characterized by a flow from sea to land

By what sign can an approaching cyclone be identified?

During a cyclone, air moves from :

When a substance is heated, its density

Which of the following will rise the highest?

Wind currents are generated due to:

Suppose you are in a car and it is raining heavily with thunderstorms. Then what is the best way to protect yourself from a possible thunder storm fall?

Which of the following is the first sign of an approaching cyclone?

Winds Storms And Cyclones

Physics 3521 Views

When a fluid is heated, it expands and becomes

Which of the following expands most of heating?

Sea breeze, a local wind system characterized by a flow from sea to land

By what sign can an approaching cyclone be identified?

During a cyclone, air moves from :

When a substance is heated, its density

Which of the following will rise the highest?

Wind currents are generated due to:

Suppose you are in a car and it is raining heavily with thunderstorms. Then what is the best way to protect yourself from a possible thunder storm fall?

Which of the following is the first sign of an approaching cyclone?

Physics
3521 Views