Social Science STD 6 Chapter 9: The Earth: Our Habitat - Exercises

Social Science STD 6 Chapter 9: The Earth: Our Habitat - Exercises

1. Choose the correct alternative and write the correct answer:
  • 1. Which planet is closest to the sun?
    Answer: (B) Mercury
  • 2. 0° Latitude is known by which name?
    Answer: (C) Equator
  • 3. Which tropics is located between 23.5° N Latitude and 66.5° N latitude?
    Answer: (B) Temperate zone
  • 4. I make an angle of 23.5° on my axis. Identify me.
    Answer: (C) Earth
  • 5. How many times, in a year does the sun intersect the equator?
    Answer: (B) Two
  • 6. Because of whose obstruction 'Solar Eclipse' is seen on Earth?
    Answer: (A) Moon
2. Identify me:
  • 1. I am called a giant planet also.
    Answer: Jupiter
  • 2. On crossing me date has to be changed.
    Answer: International Date Line
  • 3. I am 90° south latitude.
    Answer: South Pole
  • 4. I revolve around the earth.
    Answer: Moon
  • 5. If I were not there, the organisms would have died.
    Answer: Sun
3. Tell whether the following statements are true or false:
  • 1. Moon is self-illuminated.
    Answer: False
  • 2. Neptune is a blue-coloured planet.
    Answer: True
  • 3. The horizontal lines drawn on the earth are called latitudes.
    Answer: True
  • 4. On 21st June, it is winter on the tropic of cancer.
    Answer: False
  • 5. It's very cool on the equator.
    Answer: False
  • 6. 90° N latitude is called the North pole.
    Answer: True
4. Answer the following questions in short:
  • 1. What is the speed of the earth?
    The Earth completes a cycle of 1670 km per hour at the equator.
  • 2. The polar star is seen in which direction?
    The polar star is seen in the North direction.
  • 3. Which is the brightest planet in the solar system?
    Venus is the brightest planet in the solar system.
  • 4. By which name is 180° longitude known?
    180° longitude is known as the International Date Line.
5. Answer in three or four sentences:
  • 1. If the earth doesn't rotate on its axis, what will happen?
    If the Earth did not rotate on its axis, one half of the Earth would constantly face the Sun, experiencing perpetual day and extreme heat. The other half would be in perpetual darkness and cold. The regular cycle of day and night would cease to exist.
  • 2. What do you mean by latitude and longitude?
    Latitude Longitude

    1. Latitudes are imaginary horizontal lines drawn on the Earth's surface.

    2. They indicate the distance of a location north or south of the Equator.

    3. They are parallel to the Equator and to each other.

    1. Longitudes are imaginary vertical lines that connect the North and South Poles.

    2. They help determine the exact time and location of a place.

    3. They are not parallel to each other.
  • 3. The February month sometimes has 29 days. Explain the statement.
    A year is approximately 365 days and six hours long. To account for the extra six hours each year, which adds up to a full day every four years, an extra day is added to the month of February. This year is called a leap year. This is why February has 29 days once every four years.
  • 4. Which planets are known as inner planets?
    The planets Mercury, Venus, Earth, and Mars are known as the inner planets. They are located closest to the Sun in the solar system.
  • 5. What is Uttarayan?
    Uttarayan is the period when the direct rays of the sun begin to shift towards the North of the equator. This movement, also known as the Northern Solstice, starts on December 22nd. On January 14th, the sun enters the Makar rashi, which is why it is called 'Makarsankranti.'
6. Write short note on the following:
  • 1. Lunar Eclipse
    A lunar eclipse occurs when the Earth comes between the Sun and the Moon, and the Earth's shadow falls on the Moon, obstructing the sunlight from reaching it. The moon becomes dark because it is a non-luminous body and only shines with reflected sunlight. This event occurs on a full moon night, but not on every full moon night.
  • 2. Solar system
    The solar system consists of the Sun, which is a self-illuminated star, and all the celestial bodies that revolve around it. These include eight planets, their moons, asteroids, comets, and meteors. All these bodies are held in their orbits by the gravitational force of the Sun. The planets do not have their own light and are illuminated by the Sun's light.
  • 3. Tropics [zones]
    The Earth's surface is divided into different zones based on the amount of heat and light received from the Sun. The area between the Tropic of Cancer and the Tropic of Capricorn is the Torrid Zone, which receives the most direct sunlight and is very hot. The areas between the Torrid Zone and the Arctic/Antarctic Circles are the Temperate Zones, which experience moderate temperatures. The regions around the poles, within the Arctic and Antarctic Circles, are the Frigid Zones, which are extremely cold.
  • 4. Equinox
    An equinox is a phenomenon that occurs twice a year when the Sun's rays fall directly on the Equator. As a result, the lengths of day and night are equal all over the world. These events take place on March 21st and September 23rd. During these times, the Sun's position is neither in the Northern Hemisphere nor the Southern Hemisphere.