A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze

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  1. The strength of an electromagnet can be increased by
  2. Metals are good conductors of heat because
  3. The period of oscillation of a simple pendulum depends upon
  4. Which of the following can produce electricity?
  5. Every action has an equal and opposite reaction is Newton's law of Motion
  6. It is difficult to bon potatoes at the top or a mountain because
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  16. SONAR (Sound Navigation Ranging) is
  17. The acoustical quality of a room depends on
  18. The mixing up of two gases as a result of random motion of molecules is called
  19. On applying a constant force to a mass, It moves with a uniform
  20. The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the…
  21. When a bottle of perfume la opened in one corner of a room the smell spreads soon throughout the room.…
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  27. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  28. An electric charge is measured in
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