Class X

Point where all weight of object acts is called
  1. Central point
  2. Center of gravity
  3. Edge
  4. Center of mass
Dimensions of gravitational constant ‘G’ are:
  1. [M]-1 [L]³ [T]-2
  2. [M] [L]³ [T]-2
  3. [M]-1 [L]² [T]-1
  4. [M] [L]-1 [T]²
Angle of incidence in optically denser medium for which angle of refraction in less dense medium is 90° is termed as
  1. Normal angle
  2. Covalent angle
  3. Critical angle
  4. Internal angle
 If we put some water in a pot and put it over Bunsen burner, thermal energy supplied to water would lead to a gain in
  1. External Energy
  2. Internal energy
  3. Chemical energy
  4. Physical energy
 Mass of steel sphere having density 7850 kg m-3 and radius 0.15 m is
  1. 112 kg
  2. 290 kg
  3. 110.9 kg
  4. 300 kg
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