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Can two different bulbs, similar in all ...

Can two different bulbs, similar in all respect act as coherent sources ? Give reasons for your answer.

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LAKHMIR SINGH & MANJIT KAUR-FRICTION-EXERCISE
  1. Why does a matchstick light when we strike it on a rough surface ?

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  2. Why is it difficult to light a matchstick by striking it on a smooth s...

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  3. Can two different bulbs, similar in all respect act as coherent source...

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  4. Why do brake pads of bicycles have to be replaced quite often ?

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  5. A pencil earser loses tiny pieces of rubber each time you use it. Why ...

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  6. What happen when you rub your hands vigorously for a few seconds ? Why...

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  7. Explain how, friction enables us to walk without slipping.

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  8. How does a bicycle stop when its brakes are applied ?

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  9. Explain why, the soles of our shoes wear out gradually .

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  10. Why do tyres of cars wear out gradually ?

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  11. State two advantages and two disadvantages of friction.

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  12. Explain why, sportsmen use shoes with spikes.

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  13. How will you reduce friction between those machine parts which rub ag...

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  14. What is meant by lubriication ? Why is it important ?

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  15. Explain why , wheels are so useful.

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  16. Why are lubricants (oil or greses) applied to rubbing surface of machi...

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  17. Explain, how the use of oil reduces friction between two surface in co...

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  18. Why are cars, aeroplanes and rockets streamlined ?

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  19. The equation (cos p-1) x^(2) + cos p*x + sin p = 0 where x is a varia...

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  20. What are fluids ?

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