Explore topic-wise InterviewSolutions in .

1. 5

2. ice, saline water 

3. Core 

4. Crust 

5. Polish Astronomer 

6. Egyptian Astronomer 

7. Belgian

Correct option is D) Ptolemy

The universe includes innumerable galaxies, the space between them and also energy.

A planet’s day is how long it takes to complete one rotation on its own axis. Venus takes 243 earth days to complete one rotation because of its slow rotation around its axis. A year is the time taken by the planet to complete one revolution around the sun. Venus completes one revolution around the sun in 225 days. This makes a day longer than a year on Venus.

As the moon revolves around the earth it also rotates around itself. The moon takes 27.3 days to complete one revolution around the earth. It takes the moon the same time to complete one rotation around itself. Therefore, only one side of moon is visible.

A belt of celestial bodies called as asteriods is found between the planets Mars and Jupiter.

The size of the sun is so huge that around 13 lakh planets of the size of the earth can be easily placed within it.

Yes, it is a comet – a large celestial body with a long tail. I have not seen it, but heard that in 1986 there was a Halley’s comet seen in the Indian sky.

Jupiter, Saturn, Uranus, Neptune have rings around them.

Due to the gravitational force of the sun, the celestial bodies in the solar system revolve around it.

Sun, the eight planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, their satellites, Dwarf planets, asteroids, meteors and comets all together form our solar system.

Pluto is a small sized celestial body that revolves independently around the sun.

Galaxy includes stars, their planetary system, cluster of stars, nebulae, clouds of gases, clouds of dust, dead stars, newly bom stars etc.

The different types of stars are:

1. Sun-like stars e.g. stars like Sirius, Alpha Centauri 

2. Red Giants Stars 

3. Super Nova 

4. Binary or Twin Stars 

5. Variable Stars e.g. Polaris (pole star)

Comets are made up of frozen matter and dust particles. When they are close to the sun this frozen matter gets converted into gas due to the solar heat. These gases get thrown in a direction away from the sun. As a result comets appear to have a long feathery tail.

Correct option is B) Jupiter

1.  Comets are of two types: Long-period comets and short-period comets. 

2. Classification of comets is based on the time (period) taken by the comets to complete one revolution around the sun.

1. Meteors are rocky pieces originating from the asteroid belt. Smaller rocky pieces get completely burnt due to friction with air after they enter the earth’s atmosphere. 

2. Meteors which do not bum completely and fall to the surface of the earth are called meteorites.

Comets consist of an icy cluster of various constituents like dust particles. Hence it is called dirty snowballs.

Correct option is c) Big Bang

A) Increasing the use of natural gas

Milky way : The galaxy which has Solar System.

1. Galileo was an Italian astronomer. 

2. He made a device called a telescope. 

3. When Galileo first looked at the sky through this instrument, he saw many wonders unknown to him. 

4. Galileo discovered that the Sun is in the centre of the Universe and planets revolve around it. 

5. The planets are revolving on their own axis.

Slogans :

1. R₃ – Reduce, Reuse and Recycle. 

2. Clean air is vital for all to survive on the planet. 

3. Tree planting is the most reliable solution to pollution. 

4. Save the Earth, Save our environment. 

5. Don’t be cruel, preserve fuel, 

6. Unite to make planet Earth pollution – free.

Disasters : Disaster is a serious disruption that occurs in the short or long term, causing extensive human, physical, economic or environmental damage that exceeds the ability of the affected community to use its own resources.

In Andhra Pradesh Recently (2020) the following disasters are occurred.

1. Niver cyclone. 

2. L-G-Polymers – company disaster.

1. A little bit of awareness can save hundreds of iives. 

2. Stay alert and move out of the vulnerable areas. 

3. Move fast and avoid wasting time. 

4. Your life is precious – Save it.

Six ways to prevent water pollution.

1. Pick up litter and throw it away in a garbage can. 

2. Don’t put fertilizer on the grass right before it rains. 

3. Don’t pour your motor oil down the storm drain. 

4. Effluent sewage treatment. 

5. Reusing the water. 

6. Proper incineration, etc.

The following list of activities are made by human beings causing air pollution :

1. The burning of Fossil fuels. 

2. Industrial activities emit several pollutants in the air.

3. Wild fires. 

4. Transportation. 

5. Open burning of Garbage waste. 

6. Use of pesticides and fertilizers in the agriculture lands. 

7. Use of chemical and synthetic products. 

8. Use of refrigerators and AC’s etc.

Human can affect the lithosphere by farming, building structures, mining and all manner of activities that change the Lithosphere.

Measures to reduce air pollution : 

1. Using of public transport. 

2. Using of echo friendly products. 

3. Use solar energy. 

4. Recycle and Reuse. 

5. No to plastic bags. 

6. Use filters for chimneys. 

7. Avoid usage of crackers. 

8. Afforestation etc.

In my school water is being used for 

1. Drinking purpose. 

2. Washrooms purpose. 

3. Watering plants in the school. 

4. Sometimes to clean our classrooms. 

Near hand wash basins and toilets cleaning sections much of water is being wasted.

Disaster is a serious disruption that occurs in the short or long term, causing extensive human, physical, economic or environmental damage that exceeds the ability of the affected community to use its own resources.

1. Natural Disaster. 

2. Man-made Disaster.

Humans are the main cause of water pollution, which is triggered in many ways. 

1. By the dumping of industrial waste. 

2. Sewage and waste water. 

3. Mining activities. 

4. Accidental oil leakage.

5. Use of chemical fertilizers and pesticides. 

6. Leakage from sewer lines etc.

The following factors are responsible for total water that we can’t use are, 

1. 97.25% of water belongs to ocean bodies means salt water. 

2. 2.5% of the earth’s fresh water is unavailable due to following reasons : 

1) Locked up in glaciers, polar ice caps, atmosphere and soil. 

2) Highly polluted or lies too far under the Earth’s surface to be extracted at an affordable cost. 3) 0.5% of the Earth’s water is available as fresh water.So, the total water on the Earth can’t be used fully.

Disaster is a serious disruption that occurs in the short or long term, causing extensive human, physical, economic or environmental damage that exceeds the ability of the affected community to use its own resources.

C) Industrial effluents

In 1994, the United Nations General Assembly proclaimed 16th Sept, the International day for the preservation of the Ozone layer, commemorating the date of the signing in 1987, of the Montreal protocol on substances that deplete the ozone layer

According to United Nations World Water Day celebrates since 1993. Water and raises awareness of the 2.2 billion people living without access to safe water.

It is taking action to tackle the global water crisis. 

Significance : To focus on the importance of fresh water.

Ash, salt particles, smoke, acid rain, fuel consumption, industrial dust, CFC, etc.

A) 22^nd April 

1. April 22^nd 

2. March 2^2nd 

3. Hydrosphere 

4. Atmosphere 

5. September 16^th 

6. gases 

7. Human environment