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Motions of the Earth - Standard 5 - Environmental Studies - Part 1 - Balbharati

  Motions of the Earth Exercise Q.1 What’s the solution ? Amit wants to take his granny to  Australia which is in the southern  hemisphere. But she cannot bear very  cold weather. When should they make  this trip ? Ans.  Amit and his granny should make the trip to Australia during their summer, which is our winter. This way, they can avoid the cold weather and enjoy a more pleasant climate in the southern hemisphere. Q.2 Use your brain power ! (a) How many rotations does the earth  complete during one revolution  around the sun? Ans.   The Earth completes one full rotation every day, which gives us day and night. It takes about 365 days for the Earth to go around the Sun once, and during that time, the Earth rotates about 365 times on its axis. (b) It is sunrise at Itanagar in Arunachal  Pradesh. Write the names of the  following cities in the order in  which the sun will rise there.  Mumbai (Maharashtra), Kolkata  (W...
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Our Earth and Our Solar System - Standard 5 - EVS part 1

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Our Earth and Our Solar System Exercise Q.1 What's the solution? One of the asteroids has fallen out of its place in the asteroid belt and is hurtling toward the sun. Our earth is in its way and there is all likelihood of a collision. What can be done to prevent this  collision? Ans.  If an asteroid is heading towards the Sun and might collide with Earth, scientists will study its path to figure out if it's really going to hit us. If they find that it is going to hit us, they might try to change the asteroid's path by sending a spacecraft to it. This spacecraft could push the asteroid slightly off course so that it misses Earth. This way, we can prevent a collision and keep Earth safe. Q.2 Use your brain power! (1) What will happen to our solar system if the sun were to suddenly disappear ? Ans. If the sun disappeared, planets would go off course, and Earth would become very cold and dark. Life would not survive without the sun's wa...
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Sound - Standard 6 - General Science - Balbharati

 13. Sound  Exercise Q. 1 Fill in the blanks. (a) The propagation of sound does not occur through a vacuum . (b) Noise pollution is a social issue. (c) The sound which is disagreeable to the ears is called noise . (d) Noise has adverse effects on our health . Q. 2 What should we do? (a) The silencer of a motorcycle is broken. Ans. Get the silencer repaired immediately. Do not use the vehicle unnecessarily and avoid disturbing others. (b) A factory in the surroundings is producing continuous loud noise. Ans. Inform the factory management politely and request noise-control measures. If it continues, report to local authorities. Use ear protection if needed. Q. 3 Answer in your own words. (a) What is meant by vibration? Ans. Vibration is the rapid back-and-forth movement of an object. Sound is produced when an object vibrates. (b) Explain with practical examples how sound is propagated through solids. Ans. Sound travels through solids ...
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