Class X

A boy of mass 50 kg runs with a force of 100 N, his acceleration would be
  1. 5000 m s-2
  2. 50 m s-2
  3. 150 m s-2
  4. 2 m s-2
Heat capacity of sodium metal is 1500 JK-1, if mass of sodium metal is 75 kg, specific heat capacity would be
  1. 10 J kg-1 °C-1
  2. 20 J kg-1 °C-1
  3. 40 J kg-1 °C-1
  4. 80 J kg-1 °C-1
True statement about reflection is
  1. Incident ray, reflective ray and normal lies at a different point
  2. Angle of incidence is not equal to angle of reflection
  3. Point on which ray touches mirror is called critical point
  4. Angle of reflection is equal to angle of incidence
 In an experiment, 250 g of water uses 5000 J of thermal energy to raise its temperature from 50 °C to 75 °C, heat capacity of water is
  1. 200 J K-1
  2. 400 J K-1
  3. −100 J K-1
  4. −200 J K-1
Resistance of a metal wire at ice point is 800 Ω and 810 Ω at steam point, and resistance of wire is 801 Ω room temperature would be
  1. 10 °C
  2. 20 °C
  3. 30 °C
  4. 40 °C
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