To concentrate light on the defective teeth, the dentists use

A. convex mirrors

B. concave mirrors

C. convex lens

D. concave lens

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  1. The temperature, surface features, length of days and nights of a planet depend on
  2. Increase in pressure
  3. Raindrops assume a spherical shape because or
  4. The Indian Satellite System used for domestic communications, television and meteorology is known as
  5. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints.…
  6. When the earth reaches its perihelion
  7. A convex mirror always produces
  8. Meteors
  9. The earth's nearest neighbour in space is
  10. The focal length or lens or the eye is under the control or the
  11. The frequency of an ultrasonic wave is
  12. The neutron, one of the constituent particles of which the nuclei of atoms are composed was discovered…
  13. Every action has an equal and opposite reaction is Newton's law of Motion
  14. A tube light works on the principle of
  15. An electric charge is measured in
  16. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
  17. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs…
  18. The mixing up of two gases as a result of random motion of molecules is called
  19. The Indian Space Research Organisation (ISRO) is located at
  20. For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is…
  21. The instrument used to measure the strength of electric current at a point is
  22. When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
  23. The ballistic missile, Agni 11, tested by India has a maximum range of
  24. The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named
  25. In a refrigerator cooling is produced by
  26. The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the…
  27. It is easier to climb down a staircase than climb up because in climbing down
  28. A piece of cork la embedded inside an ice block which floats in water. What will happen to the level…
  29. The device for tracking and locating the position of a moving object in space is called
  30. A wire conveying a current deflects a pivoted magnetic needle. This was discovered by