Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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  1. A rod of brass la held in hand and rubbed with fur. The rod is found to have
  2. A nuclear reactor is said to have become 'critical' when
  3. A photon is
  4. The inability of a body to change its state of rest or uniform motion along a straight line is called…
  5. In an electrical circuit, a fuse is connected
  6. When a particle in motion is acted upon by a force in a direction perpendicular to the direction of…
  7. Air pressure is usually highest when the air is
  8. When an electric bulb breaks, there la an explosive sound. That is due to
  9. The power of a lens is
  10. Electromagnets are used in
  11. The Indian Satellite System used for domestic communications, television and meteorology is known as
  12. One can be recognised by his voice alone due to the factor of
  13. In compact porous soil, the rising of the water is due to
  14. Light from the sun reaches the earth in
  15. Which force is used when milk is churned to separate cream?
  16. We always see only one side of the moon because
  17. The filament lamp is an example for
  18. Fish and other aquatic creatures can live inside a deep frozen pond because
  19. A pressure gauge for fluids is called
  20. The Solar System lies near the edge of a galaxy known as
  21. The tiniest of the stars belong to the group known as
  22. One finds it more difficult to walk on ice than on a concrete road because
  23. Changing of one element into another element is known as
  24. A permanent magnet may be demagnetised by
  25. Dioptre is the unit of power of
  26. Separating particles from a suspension is effected by
  27. The radiator in a car serves to
  28. The phenomenon of radioactivity was discovered by
  29. Holography is the technique of
  30. The radius of an atom is approximately