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The planet that is known as earth's twin is

A. Mercury

B. Venus

C. Moon

D. Mars

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  1. The evaporation rate depends on
  2. A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet…
  3. Commonly used safety fuse wire is made of
  4. The temperature, surface features, length of days and nights of a planet depend on
  5. X-rays are used
  6. The SI unit of electric current is
  7. If a bar magnet is broken into two pieces
  8. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints.…
  9. When light travels from one medium to another there is a change in its
  10. The radiator in a car serves to
  11. In a hydraulic pressure
  12. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  13. The maximum displacement of the particle in a mechanical wave motion is known as
  14. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy…
  15. Moon has no atmosphere because
  16. The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than…
  17. In which of the following will a piece of iron weigh most?
  18. When the earth reaches its perihelion
  19. When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight…
  20. When a body is projected upwards
  21. The solar wind is composed of
  22. Sound waves in air are
  23. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
  24. Electron-volt is a unit of
  25. A series of east moving still pictures can be made to appear as a moving picture because the eye
  26. A thermostat is a device used
  27. The Indian Satellite System used for domestic communications, television and meteorology is known as
  28. The velocity of sound in air increases with
  29. The focal length or lens or the eye is under the control or the
  30. A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps