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In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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  1. The frequency of an ultrasonic wave is
  2. When a body Is taken to the poles from the equator, Its weight becomes
  3. Of the following types of electromagnetic radiation which has the longest wavelength?
  4. Resistance is measured in
  5. When a bowler spins a ball, it changes its direction in the air. This is due to
  6. The stars that shine brightly then dimly and then brightly are known as
  7. Nichrome is used in electric heaters and irons because
  8. Photoelectric cell is a device which converts
  9. The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce…
  10. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching…
  11. A light year means
  12. Gamma radiations are used for
  13. The rate of cooling of a hot body depends on
  14. Sound waves In 'air travel faster if
  15. In a hydraulic pressure
  16. Atoms which have the same atomic number but different mass numbers are called
  17. A lactometer la used to
  18. What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
  19. X-rays were discovered by
  20. On applying a constant force to a mass, It moves with a uniform
  21. For detecting and, testing of small electric charges we use
  22. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  23. No current will flow between two charged bodies if they have the same
  24. The focal length or lens or the eye is under the control or the
  25. Which of the following is wrongly matched?
  26. The mixing up of two gases as a result of random motion of molecules is called
  27. The radiator in a car serves to
  28. Powder clings to the skin because of
  29. In experiments on static electricity the standard method for obtaining small amounts of positive electricity…
  30. The heating element often used in an electric iron is