JEE, NEET, Foundation & CBSE (JEE Advanced 2018

A Vernier callipers has 1 mm marks on the main scale. it has 20 equal on the Vernier scale which match with 16 main scale divisions. For this Vernier callipers, the least count is
  1. 0.1mm
  2. 0.2mm
  3. 0.02mm
  4. 0.05mm
Cp and Cv are specific heats at constant pressure and constant volume respectively. It is observed that Cp – Cv = a for hydrogen gas Cp – Cv = b for nitrogen gas The correct relation between a and b is-
  1. a=b
  2. a=14 b
  3. a=28 b
  4. a=(1/4)b
Cp and Cv are specific heats at constant pressure and constant volume respectively. It is observed that Cp – Cv = a for hydrogen gas Cp – Cv = b for nitrogen gas The correct relation between a and b is
  1. a = b
  2. a = 28 b
  3. a = 14 b
  4. a = (1/14)b
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by : (Given : room
  1. 800⁰C
  2. 825⁰C
  3. 885⁰C
  4. 1250⁰C
A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in the leg will change by a factor of-
  1. 9
  2. 1/2
  3. 81
  4. 1/81
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