Winds, storms and cyclones

Increased wind speed is accompanied by

• No change in temperature

• Reduced pressure

• Increased pressure

• No change in pressure

Which of the following plays an important role in the early-warning systems for cyclones?

• Helicopters

• Submarines

• Satellites

• Stars

Which part of the earth gets the maximum amount of sunlight?

• North Pole

• South Pole

• Equator

• Tropics

The instrument that measures the wind speed is

• Anemometer

• Barometer

• Thermometer

• Ammeter

A dark funnel shaped cloud that reaches from the sky to the ground is

• Hurricane

• Tornado

• Typhoon

• Thunderstorm

What happens to air on heating?

• It contracts

• It expands

• Moves down

• Stops moving

A thunderstorm may cause:

• Flood

• Loss of life

• spoiling harvest

• All of the above

Leaves of trees, banner or flags flutter when wind is blowing. Why?

• Air occupies space

• Air is a mixture of gases

• Air exerts pressure

• Air is colourless

When we blow over a paper strip it goes upward as shown in the figure given. why?

• Blowing over the paper reduces the air pressure above the strip

• Blowing over the paper increases the air pressure above the strip

• None of these is a correct reason

• The strip will not go upward at all

A fire alarm usually detects smoke in case of fire. Where should such an alarm be placed in a room?

• Near the door

• On the floor

• On any wall

• On the ceiling