The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by

A. Copernicus

B. Ptolemy

C. Newton

D. Kepler

You can do it yup
  1. Which is the densest planet of the solar system?
  2. The rings of Saturn were discovered by
  3. The audible range of a normal human ear is frequencies ranging from
  4. Among the following the most suitable material for the core of an electro-magnet is
  5. The evaporation rate depends on
  6. When temperature decreases, resistance of metals to flow of electricity
  7. Two tumblers stuck together can be separated by
  8. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
  9. A convex mirror always produces
  10. During thunder storm you are travelling in a car. To protect yourself from the lightning you will have…
  11. Skating on ice is possible because
  12. Photoelectric cell is a device which converts
  13. Who first established the fact that the earth revolves round the sun?
  14. Which of the following is fissionable?
  15. The weight of a body is
  16. A proton is
  17. Hydrophone is an instrument used
  18. The strength of an electromagnet can be increased by
  19. Nichrome is used in electric heaters and irons because
  20. Mercury does not stick to glass because
  21. When we sweat, we feel comfortable under a fan because
  22. The spectrum of white light can be studied by
  23. The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons…
  24. In an electrical circuit, a fuse is connected
  25. We see the flash of lightning before hearing the thunder because
  26. A lactometer la used to
  27. A projectile is fired at an angle with the horizontal with a small velocity. Its horizontal range will…
  28. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints.…
  29. Of the following types of electromagnetic radiation which has the longest wavelength?
  30. The transistor was invented by