Solar System — Set 5
Geography · सौर मंडल · Questions 41–50 of 70
On which day does the Summer Solstice occur in the Northern Hemisphere?
Correct Answer: A. June 21
The Summer Solstice in the Northern Hemisphere occurs on June 21. It is the longest day of the year in that hemisphere. On this day, the Sun is directly over the Tropic of Cancer.
Which star is known as the 'Pole Star' indicating the North direction?
Correct Answer: D. Polaris
Polaris is known as the 'Pole Star' or North Star. It is located nearly directly above the Earth's North Pole. It remains in a fixed position in the sky, aiding navigation.
The darker, cooler patches on the surface of the Sun are called?
Correct Answer: B. Sunspots
Sunspots are temporary phenomena on the Sun's photosphere that appear as dark spots. They are darker because they are cooler than the surrounding areas. They are caused by concentrations of magnetic field flux.
Who formulated the Laws of Planetary Motion?
Correct Answer: D. Johannes Kepler
Johannes Kepler formulated the three Laws of Planetary Motion. These laws describe how planets orbit the Sun. They improved upon the earlier circular orbit models by proposing elliptical orbits.
Which is the second largest planet in the solar system?
Correct Answer: B. Saturn
Saturn is the second-largest planet in the solar system after Jupiter. It is a gas giant known for its rings. Despite its size, it is the least dense planet.
The imaginary line that divides the day from night on Earth is called?
Correct Answer: A. Circle of Illumination
The Circle of Illumination is the imaginary line that separates the lighted half of Earth from the dark half. It does not coincide with the axis due to Earth's tilt. It moves as the Earth rotates.
Which unit is used to measure distances between stars and galaxies?
Correct Answer: A. Parsec
Parsec is a unit used to measure large distances to astronomical objects outside the Solar System. One parsec is equal to about 3.26 light years. It is derived from the parallax of one arcsecond.
What is the approximate age of the Solar System?
Correct Answer: D. 4.6 billion years
The Solar System is approximately 4.6 billion years old. It formed from the gravitational collapse of a giant interstellar molecular cloud. This age is determined by radiometric dating of meteorites.
Which constellation is shaped like a hunter?
Correct Answer: D. Orion
Orion is a prominent constellation often referred to as 'The Hunter'. It contains bright stars like Betelgeuse and Rigel. Its belt consists of three stars in a line.
The Kuiper Belt is located beyond the orbit of which planet?
Correct Answer: D. Neptune
The Kuiper Belt is a circumstellar disc located beyond the orbit of Neptune. It contains many small icy bodies and dwarf planets like Pluto. It is similar to the asteroid belt but much larger.