The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the South Pole and demarcates one calendar day from the next. It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates to pass around some territories and island groups. From the north, the date line first deviates to the east of 180° to pass to the east of Russia’s Wrangel Island and the Chukchi Peninsula which is the easternmost part of Russian Siberia. The date line then passes through the Bering Strait between the Diomede Islands at a distance of 1.5 km from each island. The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island. It then passes midway between Alaska’s Aleutian Islands and Russia’s Commander Islands before returning southeast to 180°. Thus all of Siberia is to the west of the International Date Line, and all of Alaska is to the east of that line.

Correct Option: A

The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the South Pole and demarcates one calendar day from the next. It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates to pass around some territories and island groups. From the north, the date line first deviates to the east of 180° to pass to the east of Russia’s Wrangel Island and the Chukchi Peninsula which is the easternmost part of Russian Siberia. The date line then passes through the Bering Strait between the Diomede Islands at a distance of 1.5 km from each island. The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island. It then passes midway between Alaska’s Aleutian Islands and Russia’s Commander Islands before returning southeast to 180°. Thus all of Siberia is to the west of the International Date Line, and all of Alaska is to the east of that line.

If the star is about the mass of the Sun or less than that, it will turn into White Dwarfs. If the star is bigger than the Sun but not more than twice as big, it will turninto a Neutron Star or Pulsar. If the star is many times bigger than the Sun, it will turn into what is called a Black Hole.

Correct Option: A

If the star is about the mass of the Sun or less than that, it will turn into White Dwarfs. If the star is bigger than the Sun but not more than twice as big, it will turninto a Neutron Star or Pulsar. If the star is many times bigger than the Sun, it will turn into what is called a Black Hole.

When the Sun is vertically above the equator, the day is of equal length all over Earth. This happens twice a year, and these are the “equinoxes” in March and in September. Between the two tropic zones, which includes the equator, the Sun is directly overhead twice per year. Outside the tropic zones, whether to the south or north, the Sun is never directly overhead.

Correct Option: C

When the Sun is vertically above the equator, the day is of equal length all over Earth. This happens twice a year, and these are the “equinoxes” in March and in September. Between the two tropic zones, which includes the equator, the Sun is directly overhead twice per year. Outside the tropic zones, whether to the south or north, the Sun is never directly overhead.

A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.

Correct Option: C

A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.

21-23 December, also known as winter solstice, is the shortest day of the year in the northern hemisphere. India, being in the northern hemisphere, experiences its shortest day and longest night on this very day. The winter solstice occurs at the moment when the North Pole is tilted furthest away from the sun.

Correct Option: A

21-23 December, also known as winter solstice, is the shortest day of the year in the northern hemisphere. India, being in the northern hemisphere, experiences its shortest day and longest night on this very day. The winter solstice occurs at the moment when the North Pole is tilted furthest away from the sun.