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Sound waves with frequency greater than ...

Sound waves with frequency greater than 20 kHz are called……….. .

A

infrasound

B

ultrasound

C

sonic

D

damped sound

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CHETANA PUBLICATION-MAS03-EXERCISE
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  2. Molecular mass of methane is………….. .

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  3. Sound waves with frequency greater than 20 kHz are called……….. .

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  4. The ……….% aqueous solution of salt is called brine.

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  7. Complete the analogy: Propene : double bond : : Propyne : …………. .

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  8. State True or False. Correct the false statement: A convex mirror is ...

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  9. What is dye?

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  10. Match the columns:

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  11. Bats can navigate in dark.

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

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

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  14. Give the uses of Coal.

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

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

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

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

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

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