All Free Everyday Science MCQs with Answers

211. The Sun is at an average distance of about________ million kilometers away from Earth?

• A. 100 million
• B. 150 million
• C. 200 million
• D. 250 million

Explanation: Earth's average distance from the Sun is about 149.6 million kilometres, commonly rounded to 150 million kilometres. This distance is also called one astronomical unit.

212. Which rays are trapped in our galaxy by magnetic waves?

• A. Alpha rays
• B. Gamma rays
• C. Cosmic rays
• D. None of these

Explanation: Cosmic rays are high-energy particles that are largely confined within the Milky Way by its magnetic fields. Alpha and gamma rays are types of radiation, but the standard term for these trapped high-energy particles is cosmic rays.

213. According to Einsteins general theory of relativity the universe:________________?

• A. Must be expanding
• B. Must be contracting
• C. Must be either expanding or contracting
• D. Must be neither expanding nor contracting

Explanation: In the standard interpretation of general relativity, a universe without a stable static state must undergo expansion or contraction. Observations show that our universe is expanding, but the option describes the theoretical alternatives.

214. There is no connection of supernova explosion with___________?

• A. Cosmic rays
• B. Pulsars
• C. The formation of heavy elements
• D. Quasars

Explanation: Supernovae are linked with cosmic rays, pulsars and the creation or dispersal of many heavy elements. Quasars are extremely luminous active galactic nuclei and are not a direct consequence of supernova explosions.

215. The Temperature of the surface of Sun is_______?

• A. 5,778 Kelvin
• B. 6,778 Kelvin
• C. 7,778 Kelvin
• D. 9,778 Kelvin

Explanation: The Sun's visible surface, or photosphere, has an effective temperature of about 5,778 K, often rounded to 5,800 K. Its core is vastly hotter, so the question's surface specification is important.

216. Mass of Earth is___________?

• A. 5.972 × 1024 kg.
• B. 6.972 × 1024 kg
• C. 7.972 × 1024 kg
• D. 8.972 × 1024 kg

Explanation: Earth's mass is approximately 5.972 × 10²⁴ kilograms, determined from its gravitational effect and standard gravitational constant. The other figures differ substantially from the accepted value.

217. When a single month has two full moons, the second moon is called________?

• A. Super moon
• B. Blue moon
• C. Super blue moon
• D. Red moon

Explanation: When two full moons occur in the same calendar month, the second is traditionally called a blue moon. The name refers to the calendar occurrence, not to the Moon actually appearing blue.

218. Moon is a__________?

• A. Star
• B. Planet
• C. A & B
• D. Satellite

Explanation: The Moon is Earth's natural satellite because it orbits Earth and does not produce its own light. It is neither a star nor a planet.

219. In 2013, Planck measured the age of the universe at ___________?

• A. 13.82 billion years
• B. 4.53 billion years
• C. 4.6 billion years
• D. 4.53 billion years

Explanation: Planck's 2013 cosmological measurements gave the universe an age of about 13.82 billion years. Values near 4.5 billion years refer to the age of Earth, not the universe.

220. The study of heavenly bodies is known as_________?

• A. Astrology
• B. Astronautics
• C. Astronomy
• D. Astrophysics

Explanation: Astronomy is the broad scientific study of stars, planets, moons, galaxies and other celestial objects. Astrology makes non-scientific predictions, while astronautics concerns space travel and spacecraft.