Assertion and Reason: The Earth in the Solar System | Class 6: Additional Practice PDF Download

Q1: Assertion(A): The sun is a star.
Reason(R): Some suggested bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. The sun is a star.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. The sun is indeed a star, and stars are massive, hot celestial bodies composed primarily of gases. Stars emit heat and light due to the nuclear fusion reactions happening in their cores. The reason provided correctly explains why the sun is classified as a star.

Q2: Assertion(A): There was no way of determining the directions or time during the ancient times.
Reason(R): The North Star indicates the north direction. It is also called the pole star.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (d)
The assertion is incorrect. While ancient civilizations didn't have the advanced technology we have today, they did have methods to determine directions and time, such as using the position of the North Star (Polaris) as a reference point for navigation and timekeeping. The reason, however, is correct as it explains the role of the North Star in indicating the north direction.

Q3: Assertion(A): The word planet comes from the Greek word ‘planetai’, which means Wanderers.
Reason(R): The earth on which we live is a planet. It gets all its heat and light from the moon, which is our nearest star.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (c)
The assertion is correct. The term "planet" does indeed come from the Greek word "planetai," which means "wanderers," because planets appear to move against the background of fixed stars. However, the reason is incorrect. The Earth is not getting its heat and light from the moon, and the moon is not a star; it's a natural satellite of the Earth.

Q4: Assertion(A): The Earth is a unique planet in the solar system.
Reason(R): The Earth is neither too hot, nor too cold. It has water and air which are very essential for one’s survival.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are true. Earth is indeed a unique planet in the solar system because it supports a wide variety of life due to its moderate temperature range and the presence of liquid water and an atmosphere containing oxygen. The reason accurately explains some of the factors that contribute to Earth's uniqueness.

Q5: Assertion(A): Only one side of the moon is visible to the people of earth.
Reason(R): The moon revolves around the earth in about 27 days. It takes exactly the same time to complete one spin.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (a)
Both the assertion and the reason are true. The moon's synchronous rotation means that only one side of the moon faces the Earth at all times. This is a result of the moon's rotation period being the same as its orbital period around the Earth. The reason accurately explains the phenomenon of synchronous rotation.

Q6: Assertion(A): Small pieces of rock switch move around the sun are called meteoroids.
Reason(R): Sometimes a meteor without being completely burnt falls on the earth and creates a hollow.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. Meteoroids are small pieces of rock or metal that orbit the sun, and when they enter Earth's atmosphere and produce a bright streak of light, they are called meteors or "shooting stars." If a meteor survives its journey through the atmosphere and lands on Earth's surface, it's known as a meteorite. The reason provides a description of the process of meteors entering Earth's atmosphere.

Q7: Assertion(A): Jupiter, Saturn and Uranus have rings around them.
Reason(R): These are belts of small debris which can be seen from the Earth with a powerful telescope.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
The assertion is correct. Jupiter, Saturn, and Uranus do have rings around them, composed of various particles and debris. However, the reason is incorrect. Rings are not belts of debris that can be seen with a powerful telescope from Earth. Rings are made up of countless small particles that are often too faint to be seen with the naked eye from Earth.

Q8: Assertion(A): Light travels at a speed of about 300,000 kilometres per second.
Reason(R): It takes about 7 minutes for the light of the Sun to reach Earth.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (c)
The assertion is correct. The speed of light is approximately 300,000 kilometers per second. The reason is also correct. It takes about 7 to 8 minutes for sunlight to travel from the Sun to Earth because of the vast distance between them.

Q9: Assertion(A): The solar system is part of the Milky Way Galaxy.
Reason(R): A Galaxy is a huge system of billions of stars and clouds of dust and gases.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. The solar system is located within the Milky Way Galaxy, which is a vast collection of stars, planets, gas, dust, and other celestial objects. The reason correctly defines what a galaxy is.

Q10: Assertion(A): Ursa major or Big Bear is a constellation.
Reason(R): Various patterns formed by different groups of stars. These are called constellations.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. A constellation is a recognizable pattern formed by stars in the sky as seen from Earth. Ursa Major (Big Bear) is indeed a constellation, and it's recognized by its distinctive shape. The reason accurately explains what constellations are.

Q11: Assertion(A): All celestial bodies have their own heat and light.
Reason(R): Some celestial bodies are lit by the light of the stars. Such bodies are called planets.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (d)
The assertion is incorrect. Not all celestial bodies have their own heat and light. For instance, planets do not generate their own heat and light; they reflect the light from stars like the sun. The reason is also incorrect because it doesn't accurately define planets; planets are not lit by the light of stars, they reflect that light.

Q12: Assertion(A): The sun is in the centre of the solar system.
Reason(R): It provides the pulling force that binds the solar system. The sun is the ultimate source of heat and light for the solar system.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. The sun is indeed at the center of the solar system, and its gravitational force holds the planets, moons, and other objects in orbit around it. The sun is also the primary source of heat and light for the solar system.

Q13: Assertion(A): Earth is the only planet in the Solar System which supports life.
Reason(R): The Earth is slightly flattened at the pole. That is why its shape is described as a Geoid.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
The assertion is incorrect. While Earth is the only planet in our solar system known to support life, it's not the only one being considered in the broader universe. The reason is also incorrect. Earth's shape is not primarily described as a geoid because of flattening at the poles; rather, a geoid is a shape that closely approximates global mean sea level and accounts for the Earth's irregularities.

Q14: Assertion(A): From outer space, the earth appears blue.
Reason(R): 1/3 of Earth’s surface is covered by water. It is therefore called a blue planet.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (c)
The assertion is true. Earth does appear predominantly blue from outer space due to the reflection of sunlight off its oceans and water bodies. However, the reason is incorrect. Earth is called the "Blue Planet" not because 1/3 of its surface is covered by water, but because of its overall appearance when viewed from space.

Q15: Assertion(A): Stars, planets, and satellites are the only celestial bodies in the solar system.
Reason(R): There are numerous tiny bodies which also move around the sun. These bodies are called asteroids.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
The assertion is incorrect. Stars, planets, and satellites are not the only celestial bodies in the solar system. There are indeed numerous small bodies like asteroids, comets, and meteoroids that also orbit the sun. The reason is correct as it provides an example of one such small celestial body: asteroids.

Q16: Assertion(A): The solar system is a gravitationally bound system of the Sun and the objects that orbit it.
Reason(R): In 2006 Pluto was declared as a dwarf planet.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. The solar system indeed consists of the Sun and all the celestial objects that orbit it due to gravitational attraction. In 2006, the International Astronomical Union (IAU) redefined the criteria for classifying celestial bodies. Pluto, which was once considered the ninth planet, was reclassified as a dwarf planet due to these new criteria.

Q17: Assertion(A): Those who study celestial bodies and their movements are called astronomers.
Reason(R): The Earth is the fourth largest planet in the Solar system.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (c)
The assertion is correct. Astronomers are scientists who study celestial bodies and their properties, movements, and interactions. However, the reason is incorrect. The Earth is not the fourth largest planet in the solar system; it's the third-largest, after Jupiter and Saturn.

Q18: Assertion(A): A human-made satellite is an artificial body.
Reason(R): A satellite is a celestial body that moves around the planets in the same way as the planets move around the sun.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (b)
Both the assertion and the reason are correct. A human-made satellite is indeed an artificial object placed into orbit around a celestial body. The reason accurately explains what satellites are by comparing their motion to that of planets orbiting the sun.

Q19: Assertion(A): All planets move around the sun in a circular path.
Reason(R): The earth is tilted on its axis.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (d)
The assertion is incorrect. Planets do not move around the sun in perfect circular paths; their orbits are generally elliptical (oval-shaped). The reason is correct. The Earth's axis is indeed tilted, which causes the changing seasons and the inclination of its orbit.

Q20: Assertion(A): All eight planets of the solar system move around the sun in a fixed path.
Reason(R): These elongated paths are called orbits. Mercury is the nearest to the sun.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true
Ans: (a)
Both the assertion and the reason are correct. The planets in the solar system do indeed move around the sun in elliptical (oval-shaped) paths called orbits. Mercury is the closest planet to the sun, and its orbit is the smallest among all the planets.