Assertion and Reason: Motions of the Earth | Class 6: Additional Practice PDF Download

Q1: Assertion(A): The Earth has two types of motions, namely rotation and revolution.
Reason(R): Rotation is the movement of the Earth around the sun in a fixed path or orbit. Revolution is the movement of the earth 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: (c)
The Earth, indeed has two types of motions: rotation and revolution. However, the reason provided is incorrect. Rotation refers to the Earth's movement on its axis, causing day and night, while revolution is the Earth's movement around the Sun, leading to changes in seasons.

Q2: Assertion(A): Only one-half of the Earth gets light from the sun at a time.
Reason(R): Only one-half of the Earth gets light at a particular time because of the round shape of the 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. Only one-half of the Earth receives sunlight at any given time due to its rotation. However, the reason provided is not accurate. The round shape of the Earth is the reason why the sunlight doesn't cover the entire Earth at once, but it's not the reason why only one-half gets light. It's due to the Earth's rotation.

Q3: Assertion(A): The period of Earth rotation is known as the Earth Day. This is the daily motion of the Earth.
Reason(R): The Earth takes about 24 hours to complete one rotation around 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: (b)
Both the assertion and reason are true.
However, the reason doesn't directly explain why the period of Earth's rotation is known as "Earth Day." It's the Earth's rotation that leads to the alternation between day and night, which is why the period is called a "day."

Q4: Assertion(A): A surplus day is added to the month of February every four years.
Reason(R): Six hours are saved every year and are added to make one day over a span of 4 years.
(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 reason are true.
Every year has about 365.25 days due to the extra 0.25 days (6 hours) in each year. This accumulation of hours leads to the addition of an extra day (leap day) in February every four years to make up for the fractional day, keeping the calendar year synchronized with the solar year.

Q5: Assertion(A): The shortest day and the longest night occur on 21st of June every year.
Reason(R): The northern hemisphere is tilted towards the sun on 21st of June. The rays of the sun fall directly on the Tropic of Cancer.
(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 false. The shortest day and longest night occur on the winter solstice, which is around December 21st in the northern hemisphere.
The reason is true. On June 21st, the northern hemisphere is tilted towards the sun, and the Tropic of Cancer receives direct rays of the sun, leading to the summer solstice in the northern hemisphere.

Q6: Assertion(A): Christmas is celebrated in Australia in the summer season.
Reason(R): Australia resides in the Northern Hemisphere.
(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. Christmas is celebrated in Australia during the summer season because Australia is located in the southern hemisphere, and its seasons are opposite to those in the northern hemisphere. The reason is false. Australia is actually located in the southern hemisphere, not the northern hemisphere.

Q7: Assertion(A): On 23rd September it is autumn season in the Northern Hemisphere and spring season in the Southern Hemisphere.
Reason(R): The opposite of the above-mentioned assertion happens on the 21st of March.
(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 reason are true. The reason is not the correct explanation of the assertion. The equinoxes occur on March 21st and September 23rd when neither of the poles is tilted toward the sun, resulting in approximately equal day and night lengths. The change in seasons is due to the tilt of the Earth's axis, not the equinox dates.

Q8: Assertion(A): The earth is tilted on its axis.
Reason(R): Collision with a large asteroid is believed to be the reason behind the tilting of Earth 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: (a)
Both the assertion and reason are true. The reason is the correct explanation of the assertion. It's believed that the collision of a large celestial body with Earth billions of years ago could have caused the axial tilt, which is responsible for the Earth's seasons.

Q9: Assertion(A): On 21st March it is spring in the Northern Hemisphere and autumn in the Southern Hemisphere.
Reason(R): At this position, neither of the Poles is tilted towards the sun, so the whole Earth experiences equal days and equal nights. This is known as equinox.
(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 reason are true. The reason is the correct explanation of the assertion. Equinoxes occur on or around March 21st and September 23rd, during which neither pole is tilted toward the sun, resulting in approximately equal day and night lengths. This marks the start of spring in the northern hemisphere and autumn in the southern hemisphere.

Q10: Assertion(A): Every 4th year, February is 29 days instead of 28 days.
Reason(R): There is a surplus of six hours every year.
(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 reason are true. The reason is the correct explanation of the assertion. The surplus of about 6 hours each year (one-quarter day) accumulates to almost a full day in four years. To account for this, a leap year is added with an extra day in February.

Q11: Assertion(A): The axis of the Earth is a manmade physical line.
Reason(R): The axis of earth makes an angle of 66 and a half degree with its orbital plane.
(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 false. The axis of the Earth is not a manmade line; it's a natural concept. The reason is true. The Earth's axis is tilted at an angle of approximately 23.5 degrees with respect to its orbital plane.

Q12: Assertion(A): The portion facing the Sun experiences Day while the other half away from the Sun experiences night.
Reason(R): The circle that divides the day from night on the globe is called the circle of illumination.
(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 reason are true. The reason is true, but it doesn't fully explain the assertion. The circle of illumination is indeed the line that separates day and night on the Earth's surface, but it doesn't directly explain why the portion facing the Sun experiences day while the other half experiences night.

Q13: Assertion(A): The second motion of the earth around the sun in its orbit is called revolution.
Reason(R): It takes 375 days to revolve around the sun for the 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 true. The second motion of the Earth around the Sun is indeed called revolution. The reason is false. It takes approximately 365.25 days for the Earth to complete one revolution around the Sun, not 375 days.

Q14: Assertion(A): Seasons change due to the change in the position of the Earth around the Sun.
Reason(R): A Year is usually divided into summer, winter, spring, and autumn seasons.
(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 reason are true.
The reason is not the correct explanation of the assertion. While it's true that a year is divided into various seasons, the assertion's focus is on the change in the Earth's position relative to the Sun causing the changes in seasons.

Q15: Assertion(A): The winter solstice takes place on 21st December every year.
Reason(R): The Tropic of Capricorn receives direct rays of the sun as the South Pole tilts towards it on winter solstice.
(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 false. The winter solstice typically occurs around December 21st, but the exact date can vary slightly from year to year. The reason is true. The Tropic of Capricorn receives direct rays of the sun on the winter solstice due to the South Pole being tilted away from the Sun.

Q16: Assertion(A): On 21st March and September 23rd, a phenomenon occurs which is known as Equinox.
Reason(R): On 21st March and September 23rd, direct rays of the Sun fall on the Equator, which results in this phenomenon.
(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 reason are true. The reason is the correct explanation of the assertion. On the equinoxes, which occur around March 21st and September 23rd, the direct rays of the Sun fall on the Equator, resulting in equal day and night lengths.

Q17: Assertion(A): There are days and night changes in the seasons.
Reason(R): This is largely due to the rotation and revolution of the earth respectively.
(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 reason are true. The reason is the correct explanation of the assertion. The changes in day and night and the changes in seasons are indeed influenced by the Earth's rotation and revolution, respectively.

Q18: Assertion(A): On 21st June. The areas near the Poles receive less heat as the rays of sun Zar slanting.
Reason(R): The North Pole is inclined towards the sun and the places beyond the Arctic Circle experience continuous daylight for about 6 months.
(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)

Q19: Assertion(A): The earth goes around the sun in an elliptical orbit.
Reason(R): The Earth is inclined in the same direction in the elliptical orbit.
(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 reason are true. The reason is not the correct explanation of the assertion. The Earth's inclination doesn't relate to the elliptical shape of its orbit. The Earth's orbit is indeed elliptical, but the inclination refers to the tilt of its axis.

Q20: Assertion(A): There was knowledge in ancient India about the shape of the earth.
Reason(R): The ancient Indian astronomer Aryabhatta had stated that the Earth is round and rotates on its own 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: (a)
Both the assertion and reason are true. The reason is the correct explanation of the assertion. Aryabhatta, an ancient Indian astronomer, states that the Earth is round and rotates on its axis, demonstrating knowledge about the Earth's shape and rotation.