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State two conditions for the formation o...

State two conditions for the formation of an echo.

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At least 16 to 18 m from the source, size of reflecting surface should be greater than wavelength of sound wave.
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ICSE-SELF ASSESSMENT PAPER -1-SECTION .B.
  1. (a) Name the high energetic invisible electro magnetic wave which help...

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  2. What is an echo?

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  3. State two conditions for the formation of an echo.

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  4. A ray of light PQ is incident normally on the hypotenuse of a right an...

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  5. Two resistors of 4Omega and 6 Omega are connected in parallel to a cel...

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  6. Two resistors of 4Omegaand6Omega are connected in parallel to a cell t...

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  7. A lens produces a virtual image between the object and the lens. N...

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  8. A lens produces a virtual image between the object and the lens. D...

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  9. State Ohm's law.

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  10. A metal wire of resistance 62 Ohms is stretched so that its length inc...

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  11. A person is tuning his radio set to a particular station. What is the ...

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  12. Name the phenomenon involved, in tuning the radio set.

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  14. A half meter rod is pivoted at the centre with two weights of 20 gf an...

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  15. A half meter rod is pivoted at the centre with two weights of 20 gf an...

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  16. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  17. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  18. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  19. The current rating of fuse is 10 A., Explain the statement.

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  20. Answer the following: (1) Name the three wires of the cable. (2)...

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