When the earth crosses the tail of a comet, it indicates

Consider the following statements.

1) Sunspots are temporary phenomena on the photosphere of the Sun.

2) They appear visibly as bright spots compared to surrounding regions.

3) They may affect the climate on earth by changing the solar output received by earth.

Select the correct answer using the codes below.

Consider the following about ‘fast radio burst’, recently seen in news:

1. They are found in parts of the sky outside the Milky Way galaxy.

2. They last for several years but felt on earth for a very short duration of time.

Which of the above is/are correct?

Consider the following statements.

1. Ursa Major constellation is most clearly visible from Southern Hemisphere as against a partial obstruction from Northern Hemisphere.

2. Pole Star is a rough indicator of the direction toward the geographic North Pole.

Which of the above is/are correct?

With reference to planets of the solar system and their orbital characteristics, consider the following matches:

1. Uranus: Made entirely of rocks

2. Saturn: Longest spin time on own axis

3. Mars: Highest number of Moons

4. Mercury: Shortest orbital period around Sun

Select the correct answer using the codes below.