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Antiparticle of electron is

A. proton

B. antiproton

C. positron

D. neutron

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  1. Radio waves sent out by radio stations are reflected by
  2. Which of the following is known as freon?
  3. In a refrigerator, the refrigerant is
  4. Who discovered that the Cree Call acceleration Is the same for any object at a given place?
  5. The mixing up of two gases as a result of random motion of molecules is called
  6. If a body is taken from the earth to the moon
  7. The orbit of Venus lies between those of
  8. A convex mirror always produces
  9. The atmosphere gets heated up mainly by
  10. Which of the following can produce electricity?
  11. Dioptre is the unit of power of
  12. A person cups his hand around the mouth when shouting. Why?
  13. You want a supply of a small but constant current. Which of the following cells will you prefer?
  14. Where does the centre of gravity of a rubber ring lie?
  15. Formation of shadows can be explained by
  16. When the earth reaches its perihelion
  17. Before the invention of geostationary satellites, television stations could not transmit their programmes…
  18. Which is the densest planet of the solar system?
  19. A ruse wire is characterised by
  20. A nuclear reactor is said to have become 'critical' when
  21. The transistor was invented by
  22. The asteroids belt lies between the orbits of
  23. The radiator in a car serves to
  24. The weight of a body is
  25. The planet that spins Caster than any other planet is
  26. A light year means
  27. The heat generated in a conductor carrying current is proportional to
  28. The source of electric energy in an artificial satellite is
  29. The radius of curvature of a spherical mirror is
  30. When a whistling engine approaches a person standing on the platform, the frequency or the note