A timer in a race is at the finish line. He should start his stop watch

A. as soon as he hears the report of the gun

B. the moment he sees the flash

C. either (a) or (b) since that makes no difference

D. None of the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Body A is kept in contact with body B. Heat will flow from A to B if
  2. SONAR (Sound Navigation Ranging) is
  3. When a particle in motion is acted upon by a force in a direction perpendicular to the direction of…
  4. Rain drops acquire spherical shape due to
  5. The velocity of sound in air increases with
  6. Which of the following is not electromagnetic waves?
  7. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
  8. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
  9. A man weighing 50 kg floats on water in a lake. His apparent weight is
  10. The overhead wires supported by high towers in the grid system carry
  11. The principle of equivalence of mass and energy was established by
  12. Astigmatism, a structural defect of the eye, is due to
  13. Why is it cool near an open pond on a hot summer day?
  14. A hydraulic brake in an automobile uses
  15. Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because
  16. An electric charge is measured in
  17. When we sweat, we feel comfortable under a fan because
  18. The strength of an electromagnet can be increased by
  19. When a bullet is fired from a gun
  20. At temperature near OK, (zero kelvin) metals such as lead and tin become
  21. Which of the following is fissionable?
  22. If you want to open a door with les difficulty you push it
  23. The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons…
  24. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
  25. In the case of bodies falling under gravity which of the following remains constant at a given place?
  26. In very cold countries alcohol is used as a thermometric liquid because
  27. The radiator in a car serves to
  28. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the…
  29. The fact that two large ships travelling on close parallel courses in the same direction tend to move…
  30. Sun spots are