When water is cooled from 4C to 2C its density

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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  1. A proton is
  2. Velocity of sound in high altitudes is low because at such a height
  3. Which is the densest planet of the solar system?
  4. X-rays were discovered by
  5. Who first established the fact that the earth revolves round the sun?
  6. When temperature decreases, resistance of metals to flow of electricity
  7. The radius of curvature of a spherical mirror is
  8. Rays from the headlight of a motor car are rendered parallel by suitably using
  9. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  10. When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight…
  11. The phenomenon of spontaneous disintegration of certain heavy nuclei is termed
  12. The mirage is a phenomenon
  13. When ice melts, Its volume
  14. Which of the following apparatus is used in the electrolysis of water?
  15. At what temperature do the Fahrenheit and Kelvin scales give the same reading?
  16. Besides protons, the nucleus of an atom contains
  17. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
  18. In a concert hall reverberation is controlled by
  19. The body of an electrical appliance is earthed in order that
  20. The device used to record the sound is
  21. A star contains
  22. Alpha particles are
  23. In hot climatic conditions, the buildings are painted white because
  24. The best estimates of the age of the earth comes from the studies of
  25. The image of an object formed in a plane mirror
  26. One can be recognised by his voice alone due to the factor of
  27. Which force is used when milk is churned to separate cream?
  28. Heat is transmitted from one end of a metal rod to its other end by the method of
  29. The atmosphere gets heated up mainly by
  30. The Milky Way is