Worksheet Solutions: Learn What Causes Day and Night | General Knowledge for Young Learners - Class 1 PDF Download

Section A: Multiple Choice Questions

Q1: What is the primary cause of day and night on Earth?
(a) Rotation of the Earth on its axis
(b) Revolution of the Earth around the Sun
(c) Lunar phases
(d) Gravitational pull

Ans: (a)
Explanation: The rotation of the Earth on its axis is the primary cause of day and night. As the Earth rotates, different parts of it face towards or away from the Sun, resulting in the alternation of day and night.

Q2: Which of the following statements is true regarding day and night?
(a) The Sun moves around the Earth.
(b) Day and night occur simultaneously worldwide.
(c) Day and night occur due to the rotation of the Moon.
(d) Different parts of the Earth experience day and night at the same time.

Ans: (d)
Explanation: Different parts of the Earth experience day and night at the same time because the rotation of the Earth occurs uniformly. However, the time of day may vary due to time zones.

Q3: Why does the Sun appear to rise in the east and set in the west?
(a) The Sun orbits the Earth in an east-to-west direction.
(b) The Earth rotates from west to east.
(c) The Sun moves faster than the Earth's rotation.
(d) The Sun is stationary, and the Earth revolves around it.

Ans: (b)
Explanation: The Earth rotates from west to east, causing the Sun to appear to rise in the east and set in the west. This apparent motion is a result of the Earth's rotation on its axis.

Q4: What is the approximate duration of one complete rotation of the Earth?
(a) 12 hours
(b) 24 hours
(c) 30 days
(d) 365 days

Ans: (b)
Explanation: It takes approximately 24 hours for the Earth to complete one rotation on its axis. This period determines the length of a day and night cycle.

Q5: Which of the following latitudes experiences the longest duration of daylight during the summer solstice?
(a) Equator
(b) Tropic of Cancer
(c) Arctic Circle
(d) South Pole

Ans: (c)
Explanation: During the summer solstice, which occurs around June 21st in the Northern Hemisphere, the Arctic Circle experiences the longest duration of daylight. This is due to the tilt of the Earth's axis towards the Sun during this time.

Q6: What happens during the winter solstice in the Southern Hemisphere?
(a) The Southern Hemisphere experiences longer days and shorter nights.
(b) The Southern Hemisphere experiences shorter days and longer nights.
(c) The Southern Hemisphere experiences equal day and night durations.
(d) The Southern Hemisphere experiences no day or night during this time.

Ans: (b)
Explanation: During the winter solstice in the Southern Hemisphere, which occurs around June 21st, the Southern Hemisphere experiences shorter days and longer nights. This is because the tilt of the Earth's axis causes the Sun to be at its lowest point in the sky.

Q7: Which of the following factors does NOT influence the length of a day and night cycle?
(a) Earth's rotation speed
(b) Earth's distance from the Sun
(c) Earth's axial tilt
(d) Earth's revolution around the Moon

Ans: (d)
Explanation: The length of a day and night cycle is primarily influenced by the Earth's rotation speed, axial tilt, and its distance from the Sun. The Earth's revolution around the Moon does not have a direct impact on this cycle.

Q8: What is the term used to describe the exact moment when the Sun is at its highest point in the sky?
(a) Midnight
(b) Noon
(c) Sunset
(d) Sunrise

Ans: (b)
Explanation: Noon is the term used to describe the exact moment when the Sun is at its highest point in the sky. It is halfway between sunrise and sunset.

Q9: Which celestial body plays a significant role in causing tides on Earth?
(a) Moon
(b) Sun
(c) Mars
(d) Venus

Ans: (a)
Explanation: The Moon plays a significant role in causing tides on Earth. The gravitational pull of the Moon creates tidal bulges in the Earth's oceans, leading to the phenomenon of tides.

Q10: What would happen if the Earth stopped rotating on its axis?
(a) The duration of a day would become longer.
(b) The duration of a day would become shorter.
(c) There would be no day or night cycle.
(d) The Earth's orbit would be disrupted.

Ans: (c)
Explanation: If the Earth stopped rotating on its axis, there would be no day or night cycle. One side of the Earth would constantly face the Sun, resulting in continuous daylight on one side and perpetual darkness on the other.

Section B: Fill in the Blanks

Q1: The primary cause of day and night on Earth is the __________ of the Earth on its axis.

Ans: rotation
Explanation: The primary cause of day and night on Earth is the rotation of the Earth on its axis.

Q2: Different parts of the Earth experience day and night at the same time due to the __________ of the Earth.

Ans: rotation
Explanation: Different parts of the Earth experience day and night at the same time due to the rotation of the Earth.

Q3: The Earth rotates from __________ to __________.

Ans: west, east
Explanation: The Earth rotates from west to east, causing the Sun to appear to rise in the east and set in the west.

Q4: If the Earth stopped rotating on its axis, there would be __________.

Ans: no day or night cycle
Explanation: One side of the Earth would constantly face the Sun, resulting in continuous daylight on one side and perpetual darkness on the other.

Q5: The term used to describe the exact moment when the Sun is at its highest point in the sky is __________.

Ans: noon
Explanation: Noon is the term used for this moment, which is halfway between sunrise and sunset.

Section C: True or False

Q1: The Sun moves around the Earth.

Ans: False
Explanation: The Sun does not move around the Earth. Instead, the Earth revolves around the Sun.

Q2: Day and night occur simultaneously worldwide.

Ans: True
Explanation: Different parts of the Earth experience day and night at the same time due to the Earth's rotation.

Section D: Match the Columns

Ans: