All Free Everyday Science MCQs with Answers

• A. 2065
• B. 2061
• C. 2040
• D. None of These

Explanation: Halley's Comet takes about 75 years to orbit the Sun, so its return after 1986 is expected in 2061.

• A. 10 - 20
• B. 20 - 30
• C. 30 - 40
• D. 40 - 50

Explanation: Modern measurements place the Big Bang at about 13.8 billion years ago, which falls within the 10–20 billion-year range.

• A. 3
• B. 4
• C. 5
• D. 6Physics

Explanation: Five planets can normally be seen with the unaided eye: Mercury, Venus, Mars, Jupiter and Saturn.

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

Explanation: Jupiter’s enormous mass and strong gravity can attract or deflect some comets and asteroids, leading to its popular description as Earth’s…

• A. 9.5×106 km
• B. 9.5×109 km
• C. 9.5×1012 km
• D. 9.5×1018 km

Explanation: A light-year is the distance light travels in one year, approximately 9.46 × 10¹² kilometres. It is a unit of distance, not time.

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

Explanation: The Great Red Spot is a gigantic, long-lasting storm in Jupiter’s atmosphere.

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

Explanation: Venus is the easiest planet to see because its clouds reflect sunlight strongly, making it the brightest planet in Earth’s sky.

• A. Elliptical
• B. Highly elliptical
• C. Circular
• D. Parabolic

Explanation: Most comets follow highly elliptical orbits, travelling far from the Sun and returning after a period.

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

Explanation: Mercury moves fastest around the Sun because it is the closest planet and has the shortest orbital period, about 88 Earth days.

• A. Venus
• B. Mercury
• C. Mars
• D. Moon

Explanation: Venus is traditionally identified as Earth's nearest planet because it can come closer to Earth than any other planet.

• A. Oxygen
• B. Hydrogen
• C. Carbon Dioxide
• D. Silicon

Explanation: Hydrogen is the most abundant element in the universe, making up most of the material in stars and much of the interstellar gas.

• A. Star
• B. Planet
• C. Asteroid
• D. Meteor

Explanation: The Sun is a star because it produces its own light and heat through nuclear fusion. Planets and asteroids only reflect light from a star.

• A. Mercury
• B. Pluto
• C. Neptune
• D. Uranus

Explanation: Neptune is the outermost of the eight officially recognized planets. Pluto lies farther out at times but is classified as a dwarf planet…

• A. William Caxton
• B. John Davise
• C. Herschel
• D. Shellay

Explanation: William Herschel discovered Uranus in 1781 while conducting telescopic observations.

• A. 6
• B. 4
• C. 7
• D. 3Chemistry

Explanation: The Sun is commonly described as having six layers: core, radiative zone, convection zone, photosphere, chromosphere and corona.

• A. Less than on Earth due to its lower mass and smaller radius
• B. More than on Earth due to its smaller radius
• C. The same as on Earth because escape velocity is a constant
• D. Dependent on the time of day

Explanation: The Moon’s escape velocity is about 2.38 km/s, compared with about 11.2 km/s for Earth.

• A. Mass of the object trying to escape
• B. Radius of the planet or celestial body
• C. Both mass and radius of the planet or celestial body
• D. The velocity of the rotating planet

Explanation: Escape velocity depends on the mass and radius of the attracting celestial body, according to vₑ = √(2GM/R).

• A. 7.9 km/s
• B. 9.8 km/s
• C. 11.2 km/s
• D. 12.4 km/s

Explanation: Escape velocity depends on Earth’s mass and radius, not on the mass of the escaping object, and is about 11.2 km/s at the surface.

• A. pen needs less velocity
• B. home needs more velocity
• C. both need the same velocity
• D. none

Explanation: Ignoring air resistance, a pen and a house require the same escape velocity because escape velocity depends on the Earth’s mass and…

• A. 365 days
• B. 30 days
• C. 25 days
• D. 23 days

Explanation: The Sun rotates differentially, taking about 25 days to rotate once at its equator.