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A radio active element "90X^238 decays i...

A radio active element `"_90X^238` decays into `"_83X^222`. The no. of B particles emitted are—

A

`4`

B

`6`

C

`2`

D

`1`

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UNITED BOOK HOUSE-MODEL PAPER SET-10-EXERCISE
  1. When Ge crystals are doped with phosphorous atom, then it becomes —

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  2. A microphone converts—

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  3. A radio active element "90X^238 decays into "83X^222. The no. of B par...

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  4. The splitting of white light into several colours on passing through a...

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  5. No two electric field lines can intersect each other. Why?

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  6. What is the value of an electron-volt?

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  7. Can there be magnets with single-pole?

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  8. What is the unit of magnetic flux?

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  9. Can we cast the image formed by a convex mirror on a screen?

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  10. What is S.I. unit of power of a lens?

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  11. What is the phase difference between any two points on the same wavefr...

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  12. Name the phenomenon which illustrates the particle nature of light.

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  13. A TV tower is 80m tall. Calculate the maximum distance upto which the ...

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  14. What is the purpose of modulating a signal in transmission?

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  15. Write down the binary addition of 101010 and 010101.

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  16. Give the symbol of NOR gate.

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  17. An object is placed in front of a convex mirror of radius or curvature...

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  18. What is Lorentz force? Also write the expression for it?

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  19. Write down the dimension of magnetic field. Also write its unit in S.I...

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  20. Two electric bulbs A and B are marked 220V, 40W and 220V, 60W respecti...

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