universe & solar system section 1 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (b)

Answer: (a)

Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material.

Comets show a perceptible growing tail, while asteroids do not.

Answer: (d)

Jupiter is the fifth planet from the Sun and the largest planet in the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined.

Answer: (c)

1. A prime meridian is a meridian (a line of longitude) in a geographical coordinate system at which longitude is defined to be 0°. A prime meridian and its opposite in a 360°-system, the 180th meridian (at 180° longitude), form a great circle. This great circle divides the sphere, e.g., the Earth, into two hemispheres.
2. The Tropic of Cancer also referred to as the Northern Tropic, is the most northerly circle of latitude on the Earth at which the Sun may appear directly overhead at its culmination.
3. The International Date Line (IDL) is an imaginary line of longitude on the Earth’s surface located at about 180 degrees east (or west) of the Greenwich Meridian.
4. Arctic Circle is an imaginary circle around the earth, parallel to the equator, at latitude66° 32' N; it marks the northernmost point at which the sun appears above the level of the horizon on the winter solstice.
5. Tropic of Capricorn is the parallel of latitude that is approximately $23 1/2$ degrees south of the equator and that is the southernmost latitude reached by the overhead sun 40.

Answer: (a)

The earth was nearly covered with snow and ice in pleistocene Era.

The Pleistocene is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the world’s recent period of repeated glaciations.