Free Astronomy and Space MCQs with Answers

281. which of the following planets is known as "morning star"?

• A. Mercury
• B. VENUS
• C. Mars
• D. Saturn

Explanation: Venus is called the morning star when it appears brightly before sunrise, and the evening star when it appears after sunset. It is bright because of its reflective clouds and relative closeness to Earth.

282. Which of the following planets have the longest day?

• A. Jupiter
• B. Mercury
• C. Earth
• D. Venus

Explanation: Venus has the longest rotational day of the planets, taking about 243 Earth days to rotate once on its axis. Its rotation is also retrograde, meaning it spins opposite to most planets.

283. The inner most part of the earth is__________?

• A. Crust
• B. Mental
• C. Core
• D. None of these Biological Sciences

Explanation: The core is Earth's innermost layer, surrounded by the mantle and then the crust. “Mental” is a misspelling of mantle, which is not the innermost layer.

284. The distance of mercury from sun is__________?

• A. 56 million km
• B. 57.9 million km
• C. 58.9 million km
• D. 59.1 million

Explanation: Mercury's mean distance from the Sun is about 57.9 million kilometres, although its elliptical orbit causes this distance to vary. The other figures are only rough alternatives and are less accurate.

285. Moon light reaches to earth in___________seconds?

• A. 0.3 seconds
• B. 1.3 seconds
• C. 2.3 seconds
• D. 3.3 seconds

Explanation: Moonlight is reflected sunlight, so it takes approximately the same time as sunlight to travel from the Moon to Earth, about 1.3 seconds. The Moon is roughly 384,000 km away.

286. Which planet is much brighter in our solar system?

• A. Earth
• B. Venus
• C. Mercury
• D. Jupiter

Explanation: Venus is the brightest planet as seen from Earth because it is relatively close and has highly reflective clouds. Jupiter can also appear bright, but it is generally fainter than Venus.