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It has got local effect on lining of ute...

It has got local effect on lining of uterus .
(A) Third level IUDs
(B) Second level IUDs
(C) First level IUDs
(D) All of the given

A

Third level IUDs

B

Second level IUDs

C

First level IUDs

D

All of the given

Text Solution

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The correct Answer is:
A
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An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

KUMAR PRAKASHAN-REPRODUCTIVE HEALTH -Section - F Multiple Choice Questions (MCQs)
  1. It is a family planning method to prevent transport of gamete cell

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  2. In this process , genital duct is tied. (A) Sterilization (B) Male...

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  3. It has got local effect on lining of uterus . (A) Third level IUDs ...

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  4. They are developed by CDRI in india.

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  5. It obstructs ovum releasing from ovary .

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  6. ........is a non steroidal pills .

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  7. By what sterilization in male is called?

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  8. Which of the following devices of family planning releases metal ion?

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  9. Which of the following options is associated with diagnosis of STD?

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  10. In which age group of STI is seen more ?

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  11. Which of the following methods is proper for assisted reproductive met...

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  12. ZIFT method and GIFT method.

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  13. The sample for amniocentesis is taken from which of the following ?

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  14. For which of the following amniocentesis is done?

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  15. Which of the following options is correct to prevent STD ?

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  16. When do couple use the embryo of donor? (A) A male is having genetic...

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  17. Embryo obtained by ART is placed at which place in female? (A) In fa...

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  18. A : Reproductive health is considered as a social goal. R : In rep...

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  19. A : Improved reproduction related programmes are called RCH. R : Go...

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  20. A : Breast feeding mother have least possibilities of conception. ...

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