# Class 5 G.K Questions - Earth and universe

Welcome to our collection of Class 5 G.K Olympiad previous year questions on the Earth and Universe chapter. This quesyion paper features actual exam questions from previous years' G.K Olympiads like IGKO and SKGKO, giving you the opportunity to practice with real questions and get a sense of what to expect on the actual exam.

The Earth and Universe chapter is an important topic in the G.K Olympiad, and our collection of previous year questions covers a range of topics within this subject area, including the solar system, planets, galaxies, natural phenomena, and more. By practicing these questions, you can improve your understanding of the concepts and build confidence in your knowledge, ultimately increasing your chances of success on the G.K Olympiad.

Whether you are preparing for the IGKO or SKGKO, or any other prominent G.K Olympiad, our collection of previous year questions on Earth and Universe for Class 5 students is an invaluable resource to help you prepare effectively.

So start practicing today and take the first step towards achieving your G.K Olympiad goals.

## Class 5 IGKO - Previous year questions - Earth and universe

Q) What are the components of Earth's core?

a) Nickel and Iron

b) Nickel and Silicon

c) Silicon and Aluminium

d) Silicon and Magnesium

Explanation: Earth's core is divided into two layers: the outer core, which borders the mantle, and the inner core. Both layers are primarily composed of iron and nickel, with smaller amounts of lighter elements such as oxygen, silicon, and sulfur.

Q) The universe started with a ________.

a) Blast

b) Big Bang

c) Black Hole

d) Neutron

Explanation: The Big Bang is the most widely accepted theory about the origin and evolution of the universe. It suggests that the universe began as a hot, dense state and has been expanding and cooling ever since.

Q) The Big Bang happened around ________ billion years.

a) 14

b) 20

c) 25

d) 28

Explanation: The age of the universe is estimated to be around 13.8 billion years, which is close to option a) 14 billion years.

Q) What is the name given to the heavenly body that moves around a larger object?

a) Asteroid

b) Meteor

c) Meteorite

d) Satellite

Explanation: A satellite is a celestial body that orbits around a larger object, such as a planet or a star. The Moon is an example of a natural satellite that orbits around the Earth.

Q) How many years are taken by our solar system to rotate around the Milky Way?

a) 100 million

b) 150 million

c) 225 million

d) 350 million

Explanation: It takes about 225 million years for our solar system to make one complete orbit around the Milky Way.

Q) Generally, the satellites travel at a speed of 18,000 miles per hour. This means that they can travel entire circumference of the Earth about ________ times in a day.

a) 10

b) 14

c) 20

d) 35

Explanation: If a satellite travels at a speed of 18,000 miles per hour, it can travel around the entire circumference of the Earth (approximately 24,901 miles) about 14 times in a day.

Q) What is the ratio between orbits of Eris and Pluto?

a) 1:2

b) 1:3

c) 2:1

d) 3:1

Explanation: The ratio of Eris's orbit to Pluto's orbit is approximately 1:3. This means that for every one orbit that Eris makes around the Sun, Pluto makes approximately three orbits.

Q) Which planet is made up of shattered fragments of its inner satellites?

a) Mars

b) Jupiter

c) Uranus

d) Neptune

Explanation: Uranus is made up of shattered fragments of its inner satellites, which is thought to be the result of a large impact early in the planet's history.

Q) Which layer of Earth spins at a different speed as compared to the remaining layers?

a) Crust

b) Inner core

c) Outer core

d) Mantle

Explanation: The inner core of the Earth spins at a slightly faster rate than the rest of the planet, completing a full rotation about two-thirds of a second.

Q) Which eclipse takes place on full moon day?

a) Lunar eclipse

b) Solar eclipse

c) Any of the two

d) No eclipse

Explanation: A lunar eclipse occurs when the Moon passes directly behind the Earth and into its shadow. This can only happen during a full moon.

Q) Which planet becomes very hot during the day and quickly cools down during the night?

a) Mercury

b) Earth

c) Jupiter

d) Neptune

Explanation: Mercury is the planet closest to the Sun and has no atmosphere to trap heat, causing its temperature to range from -173°C to 427°C (-280°F to 800°F) during its day and night.

Q) Which planet is made up of very cold gases and is greenish in colour?

a) Neptune

b) Uranus

c) Mercury

d) Mars

Explanation: Uranus has a predominantly hydrogen and helium atmosphere with traces of methane, which gives it a greenish-blue color. It is also the coldest planet in our solar system, with temperatures reaching as low as -224°C (-371°F).

Q) The other name of the four outer planets of our Earth is

a) Terrestrial planets

b) Jovian planets

c) Satellite planets

d) None of these

Explanation: The four outer planets of our solar system, namely Jupiter, Saturn, Uranus, and Neptune, are also called the Jovian planets. They are primarily composed of gas and are much larger than the inner, rocky planets.

Q) _______ is the second largest planet of our solar system.

a) Mars

b) Jupiter

c) Saturn

d) Uranus

Explanation: Saturn is the second largest planet in our solar system, with a diameter of about 116,460 kilometers, making it almost 9.5 times the size of Earth.

Q) Earth’s inner and outer cores combined are about the same size as ___________.

a) Mars

b) Mercury

c) Uranus

d) Pluto

Explanation: The combined size of Earth's inner and outer core is approximately equal to the size of the planet Mercury. Mercury is the smallest planet in our solar system and has a diameter of about 4,880 kilometers, which is roughly one-third the size of Earth.

Q) Solar system contains _______.

a) Natural satellites

b) Artificial satellites

c) Communication satellites

d) Geostationary satellites

Explanation: Our solar system contains numerous natural satellites or moons orbiting around the planets. Earth has only one natural satellite, the Moon, while Jupiter has the most number of natural satellites in our solar system with at least 79 known moons.

Q) Mars is known as the Red Planet due to the presence of _______.

a) Oxygen

b) Carbon dioxide

c) Iron oxides

d) Bauxite

Explanation: Mars is known as the Red Planet because its surface is rich in iron oxide or rust.

Q) In which year NASA generated electricity with a satellite?

a) 1955

b) 1978

c) 1990

d) 1996

Explanation: In 1978, NASA launched the first solar power satellite called the "Satellite Power System Concept Development and Evaluation Program." This satellite used photovoltaic cells to convert solar energy into electricity and then beamed it down to Earth using microwave transmission.

Q) The Earth’s inner core is about the same temperature as the _______.

a) Moon

b) Sun

c) Jupiter

d) Mars

Explanation: The Earth's inner core is believed to have a temperature of around 5,500°C (9,932°F), which is similar to the temperature at the surface of the Sun.

Q) The Earth’s atmosphere is made up of various gases. Which of the following best describes the composition of atmosphere?

a) Oxygen 78%, Nitrogen 21%, Others 1%

b) Oxygen 60%, Nitrogen 30%, Others 10%

c) Nitrogen 78%, Oxygen 21%, Others 1%

d) Nitrogen 78%, Oxygen 21%, Carbon dioxide 1%

Answer: c) Nitrogen 78%, Oxygen 21%, Others 1%

Explanation: The Earth’s atmosphere is made up of approximately 78% nitrogen, 21% oxygen, and 1% other gases such as argon, carbon dioxide, and neon.

Q) According to estimates of scientists, there are around ________ galaxies in the universe.

a) 10 trillion

b) 20 trillion

c) 30 trillion

d) 50 trillion

Explanation: According to current estimates, there are around 50 trillion galaxies in the observable universe.

Q) Which planet takes 365 days to complete one revolution around the Sun?

a) Mercury

b) Earth

c) Mars

d) Neptune

Explanation: Earth takes 365 days to complete one revolution around the Sun.

Q) Earth and Moon are satellites because

a) The earth moves around the Sun and the Moon moves around the Earth

b) Moon moves around the Sun and the Earth moves around the Moon

c) Earth and Moon both move around the Sun

d) All of these

Answer: a) The earth moves around the Sun and the Moon moves around the Earth

Explanation: The Moon is a natural satellite of Earth because it orbits around the Earth while the Earth is a satellite of the Sun because it orbits around the Sun.

Q) How many layers does the Earth have?

a) 4

b) 7

c) 11

d) 25

Explanation: The Earth has seven layers: the inner core, outer core, lower mantle, upper mantle, transition region, lower crust, and upper crust.

Q) The smaller inner planets of our solar system are also called _________ .

a) Terrestrial planets

b) Satellite planets

c) Earth planets

d) Solar planets

Explanation: The smaller inner planets of our solar system, including Mercury, Venus, Earth, and Mars, are also called Terrestrial planets as they are rocky and earth-like in nature.

Q) Lunar eclipse occurs when the Earth comes in between the Sun and the Moon. It happens on

a) No moon day

b) Full moon day

c) New moon day

d) None of these

Explanation: A lunar eclipse occurs when the Earth comes between the Sun and the Moon and the Earth's shadow falls on the Moon. This happens only on a full moon day when the Sun, Earth, and Moon are aligned in a straight line.

Q) Which satellite helps farmers?

a) Irrigation satellite

b) Seed satellite

c) Weather satellite

Q) Which star is the closest star to the Earth?

a) Phobos

b) Ceres

c) Sun

d) Andromeda

Explanation: The Sun is the closest star to the Earth, and it is the center of the solar system around which all the planets revolve.

Q) How many natural satellites does Earth have?

a) 1

b) 3

c) 5

d) 9

Explanation: The Earth has one natural satellite, the Moon, and two other small moons that are often considered to be captured asteroids: Cruithne and 3753 Cruithne.

Q) Name the layer of the Earth on which we live?

a) Mantle

b) Outer core

c) Inner core

d) Crust

Explanation: The Earth is composed of several layers, including the crust, mantle, outer core, and inner core. We live on the crust, which is the thinnest and outermost layer of the Earth.

Q) There are ____________ continents and ____________ oceans on Earth?

a) 7, 5

b) 7, 6

c) 5, 7

d) 6, 7

Explanation: There are seven continents on Earth: Africa, Antarctica, Asia, Australia, Europe, North America, and South America. There are six oceans on Earth: Arctic Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, and the newly named Ocean around Antarctica.

Q) How many satellites have been destroyed by a meteorite?

a) 1

b) 10

c) 25

d) 40

Explanation: Only one satellite has been known to have been destroyed by a meteorite, which was the European Space Agency's Olympus-1 satellite.

Q) The Earth is also known as Blue Planet since it consists of around ____________ water.

a) 64%

b) 51%

c) 74%

d) 71%

Explanation: Around 71% of the Earth's surface is covered with water, which is why it is also known as the Blue Planet.

Q) Which planet is known as Evening or Morning Star?

a) Mercury

b) Venus

c) Jupiter

d) Uranus

Explanation: Venus is often called the Morning or Evening Star because of its brightness and proximity to Earth.

Q) Which planet has two naturally occurring satellites called Deimos and Phobos?

a) Mars

b) Venus

c) Mercury

d) Saturn

Explanation: Mars has two small natural satellites named Deimos and Phobos.

Q) A person who studies atmosphere and weather is called _______.

a) Meteorologist

b) Scientist

c) News reporter

d) None of these

Explanation: Meteorologists are experts who study the atmosphere and weather patterns to predict weather changes and natural disasters.

Q) What do we call the amount of water present in the air as?

a) Rainfall

b) Water vapour

c) Humidity

d) None of these

Explanation: Humidity is the amount of water vapor present in the air or a gas.

Q) The stars in this galaxy appear like a milky circle which gives it its name. Which galaxy are we talking about?

a) Sombrero

b) Whirlpool

c) Andromeda

d) Milky Way

Explanation: The Milky Way galaxy appears as a milky circle of stars and is named so because of its appearance.

Q) Which is the smallest planet of our solar system?

a) Venus

b) Mercury

c) Jupiter

d) Mars

Explanation: Mercury is the smallest planet in the solar system and is also the closest planet to the sun.

Q) Which planet is known for its many moons?

a) Earth

b) Mars

c) Jupiter

d) Venus

Explanation: Jupiter is known for its many moons, with a total of 79 confirmed moons to date.

Q) Where is the headquarters of NASA?

a) New York

b) San Francisco

c) Washington, D.C.

d) Dallas

Explanation: NASA's headquarters is located in Washington, D.C., specifically at 300 E Street SW.

Q) Who was the first earthling (mammal) to orbit the earth in 1957 in Sputnik II launched by the Soviet Union?

a) Laika

b) Coco

c) Ham

d) Felicette

Explanation: Laika was a Soviet space dog who became the first animal to orbit the Earth when she was launched on board the Soviet Union's Sputnik 2 spacecraft in November 1957. Unfortunately, she did not survive the mission.

Q) Jupiter’s moons stay in orbit due to ____.

a) gravitational pull

b) free space

c) its distance from the Sun

d) none of these

Explanation: Jupiter's moons are held in orbit around the planet by its strong gravitational pull.

Q) The celestial body that appears to change its shape every day.

a) Moon

b) Sun

c) Earth

d) None of these

Explanation: The phases of the moon cause it to appear to change shape as it orbits the Earth.

Q) Which of the following is no longer considered a planet?

a) Venus

b) Mercury

c) Pluto

d) None of these