Class X

Formula for gravitational potential energy is
  1. Ep = mg/h, where m is mass, g is gravitational pull and is height
  2. Ep = m/gh, where m is mass, g is gravitational pull and is height
  3. Ep = mgh, where m is mass, g is gravitational pull and is height
  4. Ep = gh/m, where m is mass, g is gravitational pull and is height
Mass of a car is 500 kg, which is lifted up by a crane at a height of 200 m, gravity is 10 N kg-1. Ep of car will be
  1. 1000000 J
  2. 10000 J
  3. 4 J
  4. 25 J
A bus travelling eastwards at 60 m s-1 takes 10s to come to halt, its deceleration is equal to
  1. 6 m s-1 eastward
  2. -6 m s-1 eastward
  3. 6 m s-1² eastward
  4. -6 m s-1² eastward
In physics, pressure is defined as
  1. P = A × F
  2. P = A/F
  3. P = F/A
  4. P = F/d
 Volume of mercury is 0.4 m³ and mass is 5440 kg, density of mercury is
  1. 1360 kg m-3
  2. 136 kg m-3
  3. 13600 kg m-3
  4. 13.6 kg m-3
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