Winds, Storms and Cyclones - Class 7 - Science
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Extra Questions - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
In India, a hurricane is called: A) Tornado B) Thunderstorm C) Cyclone D) Typhoon
The correct option is C) Cyclone. Hurricanes are known by various names depending on their geographical location. In India, they are referred to as tropical cyclones. The term typhoon is used in the Northwestern Pacific Basin, while hurricane is commonly used in the American continent.
"What is the best thing to do to prevent the thatched roofs of huts from being blown off during strong winds?
A) Open the doors and windows
B) Close all the doors and windows
C) Make holes in the roof
D) Burn wood inside"
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Sign up nowIn each of the questions below, four statements are given followed by three conclusions numbered I, II, and III. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements, disregarding commonly known facts.
Statements: All chairs are fires. Some fires are winds. All winds are nets. Some nets are clocks.
Conclusions: I. Some clocks are winds. II. Some nets are fires. III. Some winds are chairs.
A. None follow B. Only I follows C. Only II follows D. Only III follows E. Only II and III follow
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Sign up nowHOTS - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
The mouth of a balloon is stretched and fixed tightly over the neck of an empty boiling tube. When this boiling tube is placed in a beaker containing hot water, the balloon fixed over the neck of boiling tube gets inflated. Why ?
When the boiling tube with the balloon is placed in hot water, the air inside the boiling tube heats up. As air expands on heating, its molecules move faster and push against the balloon's interior, causing the balloon to inflate. This demonstrates that heated air occupies more space, visibly inflating the balloon. The increase in air pressure inside the tube due to the expansion of air molecules forces the balloon to expand.
Which one of the following place is unlikely to be affected by a cyclone? Why?
(a) Chennai
(b) Mangaluru (Mangalore)
(c) Amritsar
(d) Puri
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Sign up nowLong Questions - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
What is a tornado ? Describe the damage which can be caused by a tornado. What precautions should be taken for protection from a tornado ?
A tornado is a violent storm characterized by a twisting, funnel-shaped cloud. It is highly destructive due to its high speed winds. Damage caused includes uprooting trees, destroying buildings, and hurling objects and people through the air. For protection, one should take shelter in a basement or an inner room without windows, protect the head and neck with arms, and stay indoors. If outdoors, lying flat in a ditch or low area away from vehicles and power lines is advised. Avoid damaged areas after the tornado has passed.
What is a cyclone? Where is a cyclone formed? Name any five factors which help in the development of a cyclone. What is the centre of cyclone known as ?
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Sign up nowMCQ Questions - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
A violent storm lifts people and cars off the ground and hurls them hundreds of metres away. This storm is likely to be a :
(a) thunderstorm
(b) tornado
(c) cyclone
(d) typhoon
The correct answer is:
(b) tornado
A tornado is noted for its violent storm nature with a column of rapidly rotating winds, forming a dark, funnel-shaped cloud that reaches from the sky to the ground. It is capable of lifting people, cars, and other objects off the ground and hurling them hundreds of meters away due to its extremely high wind speeds and the intense low pressure within its narrow funnel.
Which of the following phenomenon does not occur in the atmosphere?
(a) cyclone
(b) earthquake
(c) wind
(d) tornado
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Sign up nowThe centre of a cyclonic storm called the 'eye of cyclone' is an area of :
(a) very low air pressure
(b) moderate air pressure
(c) very high air pressure
(d) gradually rising air pressure
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Sign up nowDuring a wind-storm, when high speed winds blow over the tin roofs of houses, the tin roofs get lifted and blown away. This happen because :
A. High speed winds reduce air pressure over the tin roofs
B. High speed winds increase air pressure over the tin roofs
C. High speed winds do not change air pressure over the tin roofs
D. Higher air pressure acts from below the tin roofs
(a) A and B
(b) B and C
(c) A and D
(d) Only D
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Sign up nowShort Questions - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
Explain why, holes are made in hanging banners and hoardings.
Holes are made in hanging banners and hoardings to allow wind to pass through them easily. This reduces the wind pressure and prevents the banners or hoardings from being torn or knocked down by high-speed winds, enhancing their durability and stability in windy conditions.
State two observations (or experiences) which tell us that air exerts pressure.
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Sign up nowWhat is meant by saying that 'air expands on heating' ?
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Sign up nowExplain how, uneven heating of 'land' and 'ocean water' in summer generates winds.
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Sign up nowVer Short Answers - Winds, Storms and Cyclones | Lakhmir Singh | Science | Class 7
When cold water is poured over a tightly corked tin can containing steam, the tin can gets crushed. What crushes the tin can?
When cold water is poured over a tightly corked tin can containing steam, atmospheric pressure crushes the can as the steam inside condenses, dramatically reducing the internal pressure.
What conclusion do you get from the observation that when cold water is poured over a tin can full of steam and corked tightly, the tin can gets crushed ?
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Sign up nowName the direction from which monsoon winds blow into our country during summer.
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Sign up nowWhat is the name of a storm consisting of a column of rapidly rotating air and having the appearance of a funnel-shaped cloud whose lower end touches the ground ?
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