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The focal length or lens or the eye is under the control or the

A. iris

B. pupil

C. ciliary body

D. cornea

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  1. Which is the densest planet of the solar system?
  2. If a body weight 12N on the surface of the earth, how much will it weigh on the surface of the moon…
  3. The device that is used to measure the electromotive force of a cell is
  4. The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons…
  5. Pyrometers are instruments used
  6. For detecting and, testing of small electric charges we use
  7. In an oil lamp, holes are provided below the chimney so that
  8. In the case of bodies falling under gravity which of the following remains constant at a given place?
  9. When we sweat, we feel comfortable under a fan because
  10. The attraction between similar molecules is called
  11. Ultrasonic waves are used
  12. When light travels from one medium to another there is a change in its
  13. Electromagnets are used in
  14. The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the…
  15. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
  16. When a swing la drawn to a side Its potential energy In relation to the earth
  17. The force that keeps a body in a circular motion la called
  18. A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field…
  19. The colour of a star is an indication of its
  20. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the…
  21. Cosmic rays contain
  22. The earth satellite Aryabhatta was put in orbit by India on
  23. The temperature, surface features, length of days and nights of a planet depend on
  24. The device used to record the sound is
  25. The coil of an electric heater is made of
  26. The Indian Satellite System used for domestic communications, television and meteorology is known as
  27. The ozone layer absorbs
  28. A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it…
  29. One can be recognised by his voice alone due to the factor of
  30. To get 5 images of a single object one should have two plane mirrors inclined at an angle of