All Free Everyday Science MCQs with Answers

261. Study of the Universe is known as___________?

• A. Sociology
• B. Cosmology
• C. Universology
• D. Petology

Explanation: Cosmology studies the origin, structure, evolution and ultimate fate of the universe as a whole. Sociology studies society, so it is not the relevant field here.

262. Big Bang theory explains_____________?

• A. Origin of Universe
• B. Origin of Sun
• C. Laws of physics
• D. None of above

Explanation: The Big Bang theory describes the early origin and expansion of the universe from an extremely hot, dense state. It does not specifically explain the origin of the Sun or establish all laws of physics.

263. Big Bang was an explosion that occurred ?

• A. 10 Billion years ago
• B. 15 Billion years ago
• C. 20 Billion years ago
• D. 25 Billion years ago

Explanation: The Big Bang is estimated to have occurred about 13.8 billion years ago, so 15 billion years is the closest option. Older textbooks commonly round the age of the universe to approximately 15 billion years.

264. Which is correct order of solar system starting from Sun ?

• A. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• B. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus
• C. Mercury, Venus, Mars, Earth, Jupiter, Saturn, Neptune, Uranus
• D. Mercury, Venus, Earth, Jupiter, Mars, Saturn, Uranus, Neptune

Explanation: The planets are arranged outward from the Sun as Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. This order follows increasing distance from the Sun.

265. Diameter of Sun is_____________?

• A. 12 Lakh kms
• B. 13 Lakh kms
• C. 14 Lakh kms
• D. 15 Lakh kms

Explanation: The Sun's diameter is approximately 1.39 million kilometres, which is about 14 lakh kilometres in the South Asian numbering system.

266. Phobos is the natural satellite of which planet__________ ?

• A. Mars
• B. Venus
• C. Saturn
• D. Neptune

Explanation: Phobos is one of Mars’s two small natural satellites, the other being Deimos. It orbits very close to Mars and moves around the planet faster than Mars rotates.

267. The final phase of a star's evolution is determined by the star's:

• A. Age
• B. Gravitational pull
• C. Density
• D. Mass

Explanation: A star's mass determines how strongly gravity compresses its core and how rapidly it consumes nuclear fuel. It therefore largely determines whether the final remnant is a white dwarf, neutron star, or black hole.

268. The season changes because of the ____________?

• A. Moon is revolving round the earth
• B. Earth is revolving round its axis
• C. Earth is revolving round the sun
• D. Planet Mars is attracting the sun

Explanation: Seasons result from Earth’s revolution around the Sun combined with the tilt of its axis, which changes the angle and duration of sunlight received. Among the options, Earth’s revolution around the Sun is the relevant cause; rotation on its axis produces day and night.

269. The distance of longitude represents how many minutes difference in time?

• A. 10 minutes
• B. 4 minutes
• C. 15 minutes
• D. 1 minute

Explanation: Earth rotates 360° in about 24 hours, so each degree of longitude corresponds to 4 minutes of time difference. Locations to the east are ahead in time, while locations to the west are behind.

270. What is meant by "Equinox"?

• A. The longest day
• B. The shortest day
• C. The sun-month long day
• D. Equal duration of day and night

Explanation: An equinox occurs when the Sun is over the Equator, making day and night nearly equal in duration across Earth. It occurs around March and September each year.