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The world's first artificial satellite Sputnik I was launched by Russia in

A. 1985

B. 1957

C. 1959

D. 1960

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  1. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
  2. X-rays are
  3. In a freezer ice cubes will be formed more quickly in trays made of
  4. When a swing la drawn to a side Its potential energy In relation to the earth
  5. The evaporation rate depends on
  6. SONAR (Sound Navigation Ranging) is
  7. No current will flow between two charged bodies if they have the same
  8. The tiniest of the stars belong to the group known as
  9. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
  10. The Milky Way is
  11. The speed of sound in air at 0° C is approximately
  12. In compact porous soil, the rising of the water is due to
  13. Rays from the headlight of a motor car are rendered parallel by suitably using
  14. The heat produced in a conductor due to the passage of a current through it is proportional to
  15. When water is cooled from 4C to 2C its density
  16. X-rays were discovered by
  17. Velocity of sound in high altitudes is low because at such a height
  18. A thermostat is a device used
  19. If a band is played on the moon the sound will
  20. The stem of a vibrating tuning fork is pressed against a sound box. Then
  21. Electromagnets are used in
  22. A transformer
  23. A pressure gauge for fluids is called
  24. The force of attraction or repulsion between two charged bodies is directly proportional to the product…
  25. The transistor was invented by
  26. Every action has an equal and opposite reaction is Newton's law of Motion
  27. Which force is used when milk is churned to separate cream?
  28. Commonly used safety fuse wire is made of
  29. The attraction of unlike molecules at the common surface is known as
  30. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water