Chemistry · NDA previous year questions

2021 28 questions

1. Q802021 · 18 Apr 2021

   Reaction of quick lime ($\mathrm{CaO}$) with water to produce slaked lime ($\mathrm{Ca}(\mathrm{OH}{)}_2$) is an example of

   1. A.Displacement reaction
   2. B.Endothermic reaction
   3. C.Decomposition reaction
   4. D.Exothermic reaction
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   Answer: D

2. Q852021 · 18 Apr 2021

   Which one of the following statements is true for a simple harmonic oscillator?

   1. A.Force acting is directly proportional to the displacement from the mean position and is in same direction.
   2. B.Force acting is directly proportional to the displacement from the mean position and is in opposite direction
   3. C.Acceleration of the oscillator is constant
   4. D.The velocity of the oscillator is not periodic
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   Answer: B

3. Q1022021 · 18 Apr 2021

   When light scattered by a molecule and the frequency of the scattered light is changed, this phenomenon is called

   1. A.Rayleigh scattering
   2. B.Raman effect
   3. C.Photoelectric effect
   4. D.Rutherford scattering
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   Answer: B