Our Earth

According to the passage, who has been trying to make the Earth a better place to live in?

• Animals

• Plants

• Human beings

• Micro-organisms

Fill in the blank: Human life evolved on the earth over ______ years ago.

• one lakh

• one thousand

• ten thousand

• one million

What is the 'Pale Blue Dot'?

• The 'Pale Blue Dot' refers to a photo of Earth taken from space, showing Earth as a tiny pixel inside a yellow circle, which is our only home.

• The 'Pale Blue Dot' is a nickname for the Moon as seen from Earth.

• The 'Pale Blue Dot' refers to a rare blue diamond found in South Africa.

• The 'Pale Blue Dot' is the name of a famous painting by Vincent van Gogh.

The passage states that our reckless exploitation of the Earth has resulted in the destruction of forests, rivers, hills, fellow animals and even fellow humans.

• True

• False

According to the passage, what are some of the environmental crises mentioned?

• Global warming and poisoning of soils, water and air

• Deforestation only

• Overpopulation

• None of the above

People today are curious to know about the secrets of distant stars and galaxies and the beginning of the universe because:

• they want to understand the origins and mysteries of the universe.

• they want to travel to other planets immediately.

• they are not interested in science.

• they believe stars control their daily lives.

Knowing that we are a small insignificant speck in this vast universe makes us realize our place in the cosmos.

• It makes us realize our place in the cosmos.

• It proves we are the center of the universe.

• It shows that humans are the most important beings.

• It means the universe revolves around us.

The objects that shine in the sky are related to us in various ways and affect us in different manners. Which of the following best describes these objects and their effects on us?

• Stars, including the Sun, provide light and energy essential for life on Earth.

• Mountains shine in the sky and control the weather directly.

• Oceans reflect sunlight and are the main source of sky brightness at night.

• Clouds are the only objects that shine in the sky and they cause gravity.

Like all planets in our solar system, Earth rotates on its own axis and goes around the Sun in a definite orbit. The orbit is the path of the Earth around the Sun. This orbit is on a uniform plane which is called the plane of the orbit. Look at these pictures of the Earth, Sun and the orbit. Which one do you think is the correct picture?

• A. A circular path

• B. An elongated oval path

• C. A scaled oval path (For example the Sun is in the middle and 1.4 cm on one side and 1.5 cm on the other side)

Tick the factors which cause the formation of seasons on the earth:

• Revolution of the Earth around the Sun.

• Tilt of Earth’s axis of rotation to its orbital plane.

• Earth’s distance from the Sun during the annual revolution.

• Daily rotation of the earth on its axis.

• Monthly movement of the Moon around the Earth.