Free Astronomy and Space MCQs with Answers

121. What is the degree of rotation of the earth each hour?

• A. 1°
• B. 5°
• C. 7.5°
• D. 15°Exploring Educational Science Kits

Explanation: Earth rotates 360° in approximately 24 hours, so its average rotation is 15° per hour. The extra text after option d is unrelated to the question.

122. The Distance of Neptune From Sun is ________ astronomical unit.

• A. 28
• B. 30
• C. 32
• D. None of these

Explanation: Neptune’s average distance from the Sun is about 30 astronomical units, with one AU equal to the average Earth-Sun distance. Its actual distance changes slightly along its orbit.

123. NASA unveils the new Moon suit, which is known formally as____________?

• A. Exploration Extravehicular Mobility Unit (xEMU)
• B. Spacesuit
• C. Berkut
• D. Non of these

Explanation: NASA's planned lunar exploration suit was formally called the Exploration Extravehicular Mobility Unit, abbreviated xEMU. It is more specific than the general term spacesuit.

124. A rocket needs the speed of _______ to escape from earth's gravity?

• A. 22 miles per second
• B. 15 miles per second
• C. 12 miles per second
• D. 7 miles per second

Explanation: Earth's escape velocity is about 11.2 km/s, or approximately 7 miles per second. A rocket must reach this ideal speed, ignoring atmospheric drag and other losses, to escape Earth's gravity.

125. Huge cloud of gass and dust in the universe is called?

• A. Constellation
• B. Satellite
• C. Meteorite
• D. Nebula

Explanation: A nebula is a vast cloud of gas and dust in space, often associated with star formation or the remains of a dying star. A constellation is only an apparent pattern of stars.

126. Apart from Venus, which planet rotates from east to west?

• A. Jupiter
• B. Mars
• C. Uranus
• D. Neptune

Explanation: Uranus has retrograde rotation, meaning it turns from east to west relative to most planets. Its extreme axial tilt makes its rotation unusual as well as giving it severe seasonal changes.

127. Our sun is classified as ?

• A. A blue giant
• B. Yellow draft
• C. Supernova
• D. None of above

Explanation: The Sun is a yellow dwarf, technically a G-type main-sequence star. “Yellow draft” is evidently a spelling error for “yellow dwarf”; it is neither a blue giant nor a supernova.

128. In what year did Galileo first use an optical telescope to study the moon?

• A. 1492
• B. 1609
• C. 1212
• D. 1743Exploring Educational Science Kits

Explanation: Galileo began using an improved optical telescope for astronomical observations in 1609, including observations of the Moon. The unrelated text after option d is a scraping error.

129. A body can escape the gravitational pull of the earth if it is thrown up with a velocity of ________ miles/second ?

• A. 35
• B. 25
• C. 12
• D. 07Trying Interactive Physics Simulation Software

Explanation: Earth's escape velocity is about 11.2 km/s, which is approximately 7 miles per second. A launch speed of about 7 miles per second is therefore required when air resistance is ignored.

130. Earth revolves around the sun from?

• A. East to West
• B. West to East
• C. South to North
• D. North to South

Explanation: Earth's revolution around the Sun is from west to east when viewed from above the North Pole. Its daily rotation is also generally west to east, which helps anchor the direction.