1. The Kelvin, the S.I. unit of thermodynamic temperature is defined as :
(a) one hundredth of the temperature difference between the triple-point of water and the steam­point
(b) one hundredth of the temperature-difference between the ice-point and the steam-point
(c) the fraction 1/273.16 of the thermodynamic temperature of the triple-point of water
(d) the fraction 1/373.15 of the thermodynamic temperature of the steam-point

2. Fish can survive inside a frozen lake because:
(a) Fish are cold-blooded animals
(b) Fish can breathe when embedded in ice
(c) Fish move to the bottom of the lake where the water is at 4°C and hence cannot freeze
(d) Fish move to the top of the take where the water is at 4°C and hence cannot freeze

3. What happens if water is cooled from 8°C to 0°C?
(a) its volume decreases uniformly, becoming minimum at 0°C
(b) its volume increases uniformly, becoming maximum at 0°C
(c) its volume decreases upto 4°C and then increases
(d) its volume increases upto 4°C and then decreases

4. When a ship floats on water
(a) it displaces no water
(b) the mass of water displaced is more than the mass of the ship
(c) the mass of the water displaced is equal to the mass of the ship
(d) the mass of water displaced is less than the ship

5. The passengers in a boat are not allowed to stand because :
(a) this will raise the centre of gravity and the boat be rocked
(b) this will lower centre of gravity and the boat will rocked
(c) the effective weight of system increases
(d) of surface tension effects

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