Q: What is Indian standard time what is its importance

IST is a meridian of longitude. It is at a distance of \$82.5^{\circ} \$ from the Greenwich towards the EAST. It passes through ALLAHABAD which is the approximate centre of India.IMPORTANCE:This meridian of longitude (82.5°E) is 5 and a half hours ahead from the time at Greenwich. India has the IST as it's standard time because if it wouldn't have been there, the country would have difference of \$2\$ hours (as India is a large country and has a large East-west extent --- there's a difference of \$2\$ hours from Gujarat in the west to Assam in the east). Hence, IST is an important meridian of longitude.

Question 1

Distinguish between Weather and Climate.

Accepted Answer

Weather: Weather is a day-to-day conditions of atmosphere at any place in regard to temperature, pressure wind, humidity and rainfall.Climate: Climate is the average state of weather for a longer period  of time at any place. Weather records of a minimum period $35$ years are found necessary to obtain reliable average.

Question 2

Variations in the length of day time and night time from season to season are due to _______.

Accepted Answer

Variations in the length of day and night time from season to season on the earth's surface is due to the axial tilt of earth's rotation axis with respect to its orbital axis. This causes variations in the intensity of Sun's rays falling at a given place over the span of a year leading to variations in day and night time.

Question 3

The colour of a star is an indication of its ________________.

Accepted Answer

The color of a star mostly indicates a star's temperature, and it can also suggest the star's age. Class O stars, which are blue in color, are the hottest, and class M stars, which are red in color, are the coldest.

Question 4

What is Indian standard time what is its importance

Accepted Answer

IST is a meridian of longitude. It is at a distance of $82.5^{\circ} $ from the Greenwich towards the EAST. It passes through ALLAHABAD which is the approximate centre of India.IMPORTANCE:This meridian of longitude (82.5&#176;E) is 5 and a half hours ahead from the time at Greenwich. India has the IST as it's standard time because if it wouldn't have been there, the country would have difference of $2$ hours (as India is a large country and has a large East-west extent --- there's a difference of $2$ hours from Gujarat in the west to Assam in the east). Hence, IST is an important meridian of longitude.

Question 5

Why is it 5:30pm in India & 12:00 noon in London ?

Accepted Answer

In London, the Greenwich Mean Time (GMT) is followed. The Indian Standard Meridian is located $82\,1/2^\circ$ east of the Prime Meridian. Thus the Indian Standard Time (IST) is 5 hours and 30 minutes ahead of GMT. That is why, when it is 12 noon in London, it is 5.30 P.M. in India. As we know the earth rotates form west to east the sun rays first fall on the eastern most longitudes.  so, the countries which are on the eastern side of Prime meridian are ahead of it whereas western parts of Prime Meridian are behind it.

Question 6

Tides are caused by the gravitational pull of the ___________.

Accepted Answer

Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.

Question 7

Which type of forests occupies the highest percentage of area in India?

Accepted Answer

Tropical Deciduous Forests, also called the Monsoon forests occupies highest percentage of area in India. They grow in the areas with annual rainfall of 70-200 cm. Sandal wood, Shisam, Mahua, Sal, Teak and Bamboo are important species of trees. Moist deciduous and the dry deciduous forests are two major categories of these forests.

Question 8

What is the importance of international date line?

Accepted Answer

International Date Line is very important. As we know that it is drawn in a zigzag manner because it deviates at places on map so that it does not cut through any island or cause confusion of dates in country.

Question 9

What is meant by Indian Standard Time? Why do we need a Standard Meridian for India?

Accepted Answer

The time applicable allover India is Indian Standard Time.To avoid time gap of two hours between east and west part ofIndia which may create confusion in working, it is essential to have a Standard Meridian.

Question 10

The latitude is the angular distance of a point on the Earth's surface, north or South of the equator as measured from the ______.

Accepted Answer

The latitude denotes a geographical coordinate of a place located on the surface of the earth and is the angular distance of that point (north or south of the equator) measured with respect to the Centre of the Earth. Its value is zero at equator and 90 degrees at poles.

Heating of the Atmosphere

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Insolation

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Meaning of Insolation and Terrestrial Radiation