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GeographyClass 7All

Define dew point.

The temperature at which the air gets saturated with water vapour that it is carrying is called dew point.

GeographyClass 7All

Name the instrument used to measure the rainfall.

Ans. Rain is measured by the rain gauge.

GeographyClass 7All

Where is conventional rainfall common?

The conventional rainfall is common in equatorial region.

GeographyClass 7All

How is conventional rainfall caused?

During the day, when the land gets heated up, the air near the surface also gets heated and rises. The cooler air from above sinks down, only to be heated and forced to rise again. Thus, a conventional current is formed and when the temperature reaches below the dew point clouds are formed that give rainfall.

GeographyClass 7All

What do you understand by leeward and windward side?

Ans. The side of the mountain that faces the rain bearing winds is called windward side and side from where the rain descends is known as leeward side.

GeographyClass 7All

Describe cyclonic rainfall?

Ans. Cyclonic rainfall is also called frontal rainfall. During a cyclone, warm air and cold air from opposite directions often meet. Where they meet, a zone of separation is formed known as front. Warm air rises obliquely above the cold air. It cools, condenses and causes rain.

GeographyClass 7All

What is precipitation? How many types of precipitation are there?

Ans. The falling of condensed water vapour is known as precipitation. It can be in the form of snow, hail, rain etc.

GeographyClass 7All

How does temperature varies from place to place?

Ans. Temperature varies from place to place mainly due to variations in latitude, altitude and distance from the sea. Higher the latitude of the place lower is the temperature. Higher the altitude lower is the temperature. Greater the distance from the sea higher the temperature.

GeographyClass 7All

What is difference between cyclone and anti cyclone?

Ans. Cyclones are formed when the strong winds blow in a spiral towards the low pressure area in the centre. In the northern hemisphere, winds blow in anticlockwise direction and in the southern hemisphere, they blow in clockwise direction around the centre of the cyclone.

GeographyClass 7All

Define diurnal range of temperature and annual range of temperature.

Ans. The difference between the maximum and minimum temperature of the day is called diurnal range of temperature. The difference between the hottest and the coldest month is called the annual range of temperature.

GeographyClass 7All

Which layer of atmosphere helps in radio transmission and how?

Ans. The ionosphere helps in radio transmission. In this layer, molecules of the atmospheric gases are broken into charge particles called ions. These ions reflect and send back the radio waves towards the earth.

GeographyClass 7All

Define air pollution and pollutants?

Any undesirable change in the composition of air is known as air pollution. Substances that cause air pollution are called air pollutants.

GeographyClass 7All

Differentiate between weather and climate.

Weather Climate 1) State of atmosphere at a particular time at a particular place. 2) It is for a short duration. 3) It varies everyday; therefore, is a temporary phenomenon. 1) It is the average weather of the place. 2) It is for a long duration. 3) It do not varies over a long time; therefore, is a permanent phenomenon.

GeographyClass 7All

Why the temperature in cities is much higher than the villages?

Ans. The temperature in the cities is high because the buildings are made of concrete and metals and roads are made of asphalt, which get heated during the day and release it during the night.

GeographyClass 7All

Why does cold air tends to sink?

The cold air is denser and heavy whereas the hot air expands due to heating, becomes light and goes up

GeographyClass 7All

How do plants take in nitrogen?

Ans. Nitrogen is the most plentiful gas in the atmosphere. Plants need it for their survival. However they cannot take it directly from the atmosphere. There are bacteria in the soil and roots of some plants that take it from atmosphere and convert it for plant use.

GeographyClass 7All

How is a balance between the amounts of carbon dioxide maintained in the atmosphere?

Ans. The Carbon-dioxide is an important gas of the atmosphere. It is added and also used. The balance is maintained in the following ways: Green plants use it to make their food and release oxygen. Animals and humans release carbon dioxide in the atmosphere. There is a perfect balance, which is disturbed by the burning of fossil fuels that add large amounts than necessary.

GeographyClass 7All

What is the importance of atmosphere?

Ans. The atmosphere acts as a blanket. All living things depend on it for its survival. It provides us with the air we breathe, protects us from the harmful sun rays. Otherwise, we would be baked alive by the heat of sun during the day and get frozen during the night.

GeographyClass 7All

Define insolation.

Ans. The word insolation is made from: in + sol + ation, i.e., in means coming in, sol means solar and ation means radiation. So, insolation means in coming solar radiation.

GeographyClass 7All

Why do we feel uncomfortable on a humid day?

We feel uncomfortable on humid day because air is already full of water vapour, so its capacity to hold more moisture is not there. As a result, our body sweat does not evaporate making us uneasy.

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