Standard 7 Balbharti Solutions

 Standard 7



3. Properties of Natural Resources



6. Measurement of Physical Quantities

7. Motion, Force and Work

8. Static Electricity

9. Heat




13. Changes – Physical and Chemical

14. Elements, Compounds and Mixtures

15. Materials we Use

16. Natural Resources

17. Effects of Light

18. Sound: Production of Sound

19. Properties of a Magnetic Field

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

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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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