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Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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  1. The aneroid barometer uses
  2. A series of east moving still pictures can be made to appear as a moving picture because the eye
  3. Pyrometers are instruments used
  4. Which of the following wires of same dimensions offers least resistance to the ,flow of current?
  5. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  6. The earth satellite Aryabhatta was put in orbit by India on
  7. A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will
  8. The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the…
  9. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the…
  10. Which mirror is used as a rear view mirror in Vehicles?
  11. A person cups his hand around the mouth when shouting. Why?
  12. The theory that the earth constituted the centre of the universe around which the sun and the planets…
  13. Choose the correct answer
  14. Mercury is used in thermometers because
  15. The image of an object formed on the retina of the eye is
  16. Increase in pressure
  17. If a body weight 12N on the surface of the earth, how much will it weigh on the surface of the moon…
  18. The plants in a greenhouse are enclosed in a glass enclosure because
  19. If the speed of the rotation of the earth increases the weight of a body
  20. A pressure gauge for fluids is called
  21. Out of the following which element has the longest half-life period?
  22. Lightning conductors are made of
  23. In a longitudinal wave, the direction of propagation of the wave is
  24. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
  25. The heating element often used in an electric iron is
  26. How is it that Pluto is not always the farthest planet of the solar system?
  27. If a bar magnet is broken into two pieces
  28. When an electric bulb breaks, there la an explosive sound. That is due to
  29. The mixing up of two gases as a result of random motion of molecules is called
  30. Which part of the eye photographic camera?