All Free Everyday Science MCQs with Answers

51. ___________ is a star at the center of the solar system?

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

Explanation: The Sun is a star whose gravity holds the planets and other bodies in the solar system in orbit. It lies at the system’s centre.

52. The outermost layer of the sun is called __________?

• A. Coach
• B. Core
• C. Corona
• D. Comma

Explanation: The corona is the Sun’s extremely hot, thin outer atmosphere, extending millions of kilometres into space. It is especially visible during a total solar eclipse.

53. The sun is _________times bigger than the Earth.

• A. 105
• B. 107
• C. 109
• D. 111

Explanation: The Sun’s diameter is about 109 times Earth’s diameter, although its volume is roughly 1.3 million Earths. These questions usually use “times bigger” to mean diameter.

54. Comets revolves around?

• A. The sun
• B. The Moon
• C. The Earth
• D. Venus

Explanation: Comets are icy bodies that orbit the Sun, usually on highly elongated paths. Their tails become visible when solar heating releases gas and dust near the Sun.

55. The outermost layer of the Earth is called ____________?

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

Explanation: The crust is Earth’s thin, rigid outermost layer, lying above the mantle and core. “Mental” is a misspelling of mantle, which is beneath the crust rather than at the surface.

56. The Planet of the solar system which has Maximum number of moons is___________?

• A. Jupiter
• B. Venus
• C. Saturn
• D. Uranus

Explanation: Saturn currently has the greatest number of confirmed moons in the solar system. Moon counts can change as new small satellites are discovered, but Saturn remains the expected answer here.

57. which human made object to venture into interstellar space?

• A. Apollo 1
• B. Sputnik
• C. Apollo II
• D. Voyager 1

Explanation: Voyager 1 crossed the heliopause and entered interstellar space in 2012, making it the first human-made object to do so. Apollo missions and Sputnik remained within the solar system.

58. The Chandrayaan-3 mission by the Indian Space Research Organisation (ISRO) was successfully lifted off from which Space Centre?

• A. Paresh Dhawan Space Centre
• B. Satish Dhawan Space Centre
• C. Ram Dhawan Space Centre
• D. Shiri Dhawan Space Centre

Explanation: Chandrayaan-3 was launched from the Satish Dhawan Space Centre at Sriharikota, India. The other names are not the official name of the launch centre.

59. Which planets are called ice giants?

• A. Outer planets (Uranus and Neptune)
• B. Outer planets (Jupiter and Neptune)
• C. Outer planets (Jupiter and Saturn)
• D. Inner planets (Mercury and Earth)

Explanation: Uranus and Neptune are called ice giants because their interiors contain large amounts of water, ammonia and methane ices. Jupiter and Saturn are classified as gas giants instead.

60. The ice giants are mostly made of 'volatile' substances such as?

• A. Water, mercury and methane
• B. Water, ammonia and mercury
• C. Water, plasma and methane
• D. Water, ammonia and methane

Explanation: The principal volatile materials in the ice giants are water, ammonia and methane. Mercury is a metal, while plasma is an ionised state of matter rather than a characteristic planetary volatile.