Correct Answer: Blue white

Class                Temperature (Kelvin)               Color

M                     2,000–3,500 K                           red
K                      3,500–5,000 K                           orange
G                      5,000–6,000 K                           yellow
F                      6,000–7,500 K                           yellowish white
A                      7,500–10,000 K                         white
B                      10,000–30,000 K                        blue white
O                      30,000–60,000 K                        blue

The above chart is the evidence for the color of the star Bellatrix being blue white.

Correct Answer: Option 3 – Larger and have lower densities

Jovian planets are also referred to as gas giants. These include Jupiter, Uranus, Saturn and Neptune. They are primarily composed of hydrogen and helium and generally have low densities, rapid rotation, and deeper atmospheres. Giant planets have diameters greater than 48000 km. their position is outside compared to relative position of sun.

Hence, the options 1, 2 and 4 are incorrect.

Correct Answer: Option 4 – Sun, the moon and some stars

The Sun is the central entity around which the earth, other planets and stars revolve in their orbits. The Moon revolves around the earth. Earth also spins on its axis. The spinning of the earth on its own axis at a speed differing from the moon, sun and other stars causes the apparent rising and setting of all these entities.

Hence, option 4 constituting most the entities around the earth is the correct answer. And the other 3 options referring to only sun or moon or moon and stars are incomplete and incorrect.

Correct Answer: Option 2

Venus is the second planet from the Sun and it lies108 million km from the Sun. Venus is often referred to as our sister planet because of similarities in size, mass, density and volume. It is believed that both planets share a common origin forming at the same time around 4.5 billion years ago. Option 2 shows 2 shaded circles with similar sizes. Hence, this is the correct answer.

The other 3 options depict varying sizes of the planets earth and Venus. Hence, options 1, 3 and 4 are incorrect.