Class X

When state is being changed from gas to liquid through process of condensation, temperature
  1. Increases
  2. Decreases
  3. Remains constant
  4. May increase or decrease
If a cup of tea at 50 °C is allowed to cool to room temperature, heat released would be (assume room temperature to be equal to 25 °C and heat capacity of cup and tea to be = 5.0 kJ ⁄ K)
  1. 25 kJ
  2. 50 kJ
  3. 125 kJ
  4. 250 kJ
In a typical power station, amid a series of energy transfers and conversions, about 70% of energy input gets wasted in form of thermal energy, efficiency of such a power station is about
  1. 0.3
  2. 0.2
  3. 0.4
  4. 0.7
Mass of oil is 11040 kg and volume is 12 m³, its density would be
  1. 92 kg m-3
  2. 920 kg m-3
  3. 9.2 kg m-3
  4. 1.08 × 10-3
Sound passes from one place to another in form of
  1. Rays
  2. Waves
  3. Energy
  4. Light
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