All Free Everyday Science MCQs with Answers

• A. Ice and dust
• B. Dust and lights
• C. Ice, dust and lights
• D. All of the above

Explanation: A comet's nucleus is mainly a mixture of ice and dust, with frozen gases and rocky grains also present.

• A. Steam and dust
• B. Gas and dust
• C. Steam, gas and dust
• D. None of the above

Explanation: Near the Sun, cometary ices sublimate directly into gas, carrying dust away from the surface.

• A. 10
• B. 11
• C. 12
• D. 13

Explanation: Twelve astronauts walked on the Moon during the six successful Apollo landing missions, from Apollo 11 through Apollo 17.

• A. the Simerian Basin
• B. the Inbrium Basin
• C. the Imbrium Basin
• D. Black Bowl Basin

Explanation: The Imbrium Basin is the large impact basin associated with the Moon's Mare Imbrium.

• A. The moon has both atmosphere and magnetic field
• B. The moon has no atmosphere or magnetic field
• C. The moon has atmosphere but no magnetic field
• D. The moon has magnetic field but no atmosphere

Explanation: The Moon has no substantial atmosphere and no global magnetic field, so basic astronomy texts describe it this way.

• A. - 173 degrees Celsius at night to 127 degrees Celsius during the day
• B. - 172 degrees Celsius at night to 172 degrees Celsius during the day
• C. Remains constant during day and night
• D. - 170 degrees Celsius at night to 107 degrees Celsius during the day

Explanation: With virtually no atmosphere to distribute heat, the lunar surface becomes extremely cold at night and very hot in daylight, roughly from…

• A. Krypton
• B. Xenon
• C. Neon
• D. Helium

Explanation: Helium was first identified through a spectral line in the Sun's chromosphere before it was discovered on Earth.

• A. These gases are not present
• B. These gases are like plasma
• C. These gases are frozen
• D. These gases are volatile

Explanation: As Pluto moves farther from the Sun, its surface becomes colder and nitrogen and methane condense and freeze onto the surface.

• A. Saturn, Jupiter, Hydrogen
• B. Uranus, Neptune, Nitrogen
• C. Saturn, Neptune, Nitrogen
• D. Mars, Venus, Hydrogen

Explanation: Titan is Saturn's moon and Triton is Neptune's moon; both have nitrogen-dominated atmospheres.

• A. Gravity is low and temperature of atmosphere is great
• B. Gravity and temperature both are great
• C. Gravity and temperature both are constant
• D. Gravity is great and temperature of atmosphere is low

Explanation: A planet retains an atmosphere more effectively when its gravity is strong enough to hold gas particles and the atmospheric temperature is…

• A. Southern pole region
• B. Northern pole region
• C. Equator
• D. All of the above

Explanation: Water ice has been conclusively detected in permanently shadowed craters near the Moon’s south pole, where sunlight cannot warm the…

• A. 363-feet
• B. 364-feet
• C. 365-feet
• D. 366-feet

Explanation: The Saturn V used for Apollo 11 stood about 363 feet, or roughly 111 metres, tall.

• A. Time capsule
• B. Light capsule
• C. Meta capsule
• D. Natural capsule

Explanation: The permanently shadowed lunar polar regions are described as a natural time capsule because their extreme cold greatly slows chemical and…

• A. Triangulum
• B. Andromeda
• C. Messier 81
• D. Whirlpool

Explanation: Among the major galaxies commonly listed near the Milky Way, the Andromeda Galaxy is the nearest large spiral and the Triangulum Galaxy is…

• A. Einstein
• B. Newton
• C. Copernicus
• D. Archimedes

Explanation: Copernicus is commonly called the father of modern astronomy because his heliocentric model placed the Sun, rather than Earth, at the…

• A. It has negligible mass
• B. It has not nearly round shaped
• C. It does not have always same neighbouring planet
• D. All of the above

Explanation: A dwarf planet is nearly round but has not cleared the neighbourhood around its orbit of other bodies.

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

Explanation: Mars appears reddish because iron-bearing minerals in its surface rocks have oxidised, producing iron oxides similar to rust.

• A. Time
• B. Energy
• C. distance
• D. Mass

Explanation: A light-year measures distance, specifically the distance light travels in one year, about 9.46 trillion kilometres.

• A. Oxygen and Ammonia
• B. Hydrogen and Helium
• C. Hydrogen and Oxygen
• D. Methane and Hydrogen

Explanation: The Sun is composed mainly of hydrogen, which provides most of its mass, and helium, produced and already present through stellar…

• A. Saturn
• B. Mars
• C. Venus
• D. None

Explanation: Saturn has an average density lower than that of water, about 0.69 g/cm³, so it would float in a sufficiently large water body.