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Who discovered Atom ?

  • Madam Curie
  • James Chadwick
  • Rutherford
  • John Dalton

Answer: Option D

Explanation:

John Dalton discovered Atom in 1808,

Madam Curie discovered Radium in 1898,

James Chadwick discovered Neutron in 1932,

Rutherford discovered Proton in 1919.

Similar Questions :

1. Which instrument is used to measure heat radiation ?

  • Radar
  • Salinometer
  • Refractometer
  • Radio micrometer

Answer: Option D

Explanation:

Radar - is used to detect the direction and speed of an object by means of radiowaves,

Salinometer - is used to determine salinity of solutions,

Refractometer - is used to measure refractive indices.

2. The absorption of ink by blotting paper involves

  • capillary action phenomenon
  • viscosity of ink
  • siphon action
  • diffusion of ink through the blotting

Answer: Option A

3. The rotational effect of a force on a body about an axis of rotation is described in terms of

  • Centre of gravity
  • Centripetal force
  • Centrifugal force
  • Moment of force

Answer: Option D

4. The angle of reflection is equal to the angle of incidence.

  • True
  • False

Answer: Option A

5. Electric Motor converts

  • Electrical energy into mechanical energy
  • Mechanical energy into Electrical energy
  • Electrical energy into light energy
  • None of above

Answer: Option A

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