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Which instrument is used to measure curvature of spherical objects ?

  • Spectroscope
  • Spherometer
  • Spectrometer
  • Sextant
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2. Atom is the smallest part of matter which takes part in chemical reactions.

  • True
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3. Energy posses by a body in motion is called

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4. The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.

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5. What is escape velocity ?

  • Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
  • Escape velocity is the minimum velocity with which a body should be projected from the surface of earth so it do not go beyond gravitational field of earth.
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  • Escape velocity is the maximum velocity with which a body should be projected from the surface of earth so as it goes out of gravitational field of earth and never return to earth.
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