Chemistry · NDA previous year questions

2013 32 questions

1. Q772013 · 14 Apr 2013

   The pH of fresh milk is 6. When it turns sour, the pH

   1. A.becomes $<6$
   2. B.remains the same, i.e., 6
   3. C.becomes $>6$
   4. D.becomes neutral, i.e., 7
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   Answer: A

2. Q782013 · 14 Apr 2013

   The displacement of a particle is given by $x={\cos }^2\omega t$. The motion is

   1. A.simple harmonic
   2. B.periodic but not simple harmonic
   3. C.non-periodic
   4. D.None of the above
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   Answer: A

3. Q812013 · 14 Apr 2013

   The motion of an electron in presence of a magnetic field is depicted in the figure given above. The force acting on the electron will be directed

   1. A.into the page
   2. B.out of the page
   3. C.opposite to the motion of the electron
   4. D.along the motion of the electron
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   Answer: B

4. Q882013 · 14 Apr 2013

   The acid contained in vinegar is

   1. A.acetic acid
   2. B.ascorbic acid
   3. C.citric acid
   4. D.tartaric acid
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   Answer: A

5. Q892013 · 14 Apr 2013

   Which one among the following is not a chemical change?

   1. A.Curdling of milk
   2. B.Ripening of fruit
   3. C.Evaporation of water
   4. D.Burning of coal
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   Answer: C

6. Q902013 · 14 Apr 2013

   The acid in gastric juice is

   1. A.acetic acid
   2. B.nitric acid
   3. C.hydrochloric acid
   4. D.sulphuric acid
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   Answer: C

7. Q1002013 · 14 Apr 2013

   Metal used to make wires for safety fuses must have

   1. A.very low resistivity and high melting point
   2. B.high resistivity and low melting point
   3. C.low resistivity and low melting point
   4. D.high resistivity and high melting point
   Show answer

   Answer: B