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"The foetus obtain some antibodies from ...

"The foetus obtain some antibodies from the mother through the placenta during pregnancy" It is an example of

A

Active immunity

B

Passive immunity

C

innate immunity

D

Acquired immunity

Text Solution

Verified by Experts

The correct Answer is:
B
Passive immunity
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Earth's orbit is an ellipse with eccentricity 0.0167. Thus the earth's distance from the sun and speed as it moves around the sun varles from day-to-day. This means that the length of the solar day is not constant through the year. Assume that the earth's spin axis is normal to its orbital plane and find out the length of the shortest and the longest day. A day should be taken from noon to noon. Does this explain variation of length of the day during the year?

A 1.2m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60^(@) . After some time, the angle of elevation reduces to 30^(@) (see the given figure). FInd the distance travelled by the balloon during the interval.

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-HUMAN HEALTH AND DISEASE -Section - F (Multiple Choice Question) (MCQs FROM .DARPAN. BASED ON TEXTBOOK)
  1. What is called as skin cancer ?

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  2. Match the correct set :

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  3. "The foetus obtain some antibodies from the mother through the placent...

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  4. Ringworm in human is caused by :-

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  5. The organism that causes elephantiasis belongs to …………………..

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  6. Response against allergic inflammation is given by which substance whi...

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  7. Diseases are classified into

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  8. .... is a very sensitive phase of mental and psychological development...

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  9. Diseases are classified into how many types ?

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  10. Pneumonia is spreading by ..............

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  11. From where do soprozoites obtain food and become spherical in shape ?

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  12. Ringworm is a disease occurred by fungus,Trichophyton. R - Ringworm ...

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  13. By sexual reproduction oocyst is converted in to …….....

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  14. What is Elephantiasis or Filariasis, mention its causative, symptoms a...

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  15. Which of the following diseases spreads by sneezing and coughing of an...

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  16. Which of the following substances is obtained from fungus Ergot?

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  17. PMNL stands for

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  18. What is Passive immunity ?

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  19. S-Fever and weakness are the symptoms of malaria. R- Plasmodium dec...

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  20. Which immunity is acquired by hereditary?

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