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What is an echo? What factors are import...

What is an echo? What factors are important to get a distinct echo?

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CHETANA PUBLICATION-MAS03-EXERCISE
  1. What is dye?

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  2. Match the columns:

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  3. Bats can navigate in dark.

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  4. Give reasons, (any 2) Methane is used as a domestics fuel.

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  5. Give scientific reasons: Bleaching powder has the odour of chlorine.

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  6. Give the uses of Coal.

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  7. If you hear the thunder 20 seconds after you see the flash of lightnin...

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  8. An object 10 cm in height is placed at a distance of 36 cm from a conc...

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  9. The speed of sound in air at 0^@C is 332 m//s. If it increases at the ...

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  10. Give structural formula and electron dot model of methane.

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  11. What is an echo? What factors are important to get a distinct echo?

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  12. Write a short note on biogas plant. (3) Give the properties and uses o...

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  13. Explain the sign conventions for reflection by spherical mirrors

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  14. Hydrogen gas is filled in two identical bottles, A and B, at the same ...

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  15. Explain the following SCImical reactions with the help of a balanced e...

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  16. Explain the following SCImical reactions with the help of a balanced e...

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  17. Write the properties and uses of Teflon.

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  18. Draw ray diagram for object at infinity for a concave mirror.

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  19. Write in short note on SONAR?

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  20. With the help of a neat labelled diagram, explain the laboratory prepa...

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