Melting

Q. 0 degree Celcius is equal to ______ Kelvin.

1. 0
2. -273
3. 273
4. 100

Q.

When a gas is cooled, what happens to its molecules?

Q. As ice melts to form water,

Q. During melting, the state of a chocolate is changed from _______________.

1. solid to liquid
2. liquid to solid
3. liquid to gas
4. gas to liquid

Q.

Give two reasons to justify.

(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.

Q. 10. What is the effect of heat on the states of matter?Illustrate the effect of heat on ice.

Q. Which among the three states of matter are called fluids?

1. Liquids and gases
2. Only liquids
3. Only gases
4. Solids and gases

Q. A few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents a correct arrangement?
(A) Water < air < sugar
(B) Air < sugar < oil
(C) Air < water < sugar
(D) Salt < juice < air

Q. Which of the following substance is a solid?

1. Rock
2. Juice
3. Oxygen
4. Water

Q.

The motion of water particles will be fastest at °C.

1. 100
2. 0
3. 10
4. 50

Q. The temperature at which a liquid boils to form vapours is called its .

1. freezing point
2. melting point
3. boiling point

Q. Which of the following states of matter has the highest kinetic energy of the particles?

1. Solids
2. Gases
3. All the states have same kinetic energy
4. Liquids

Q. During melting, the state of a chocolate is changed from _______________.

1. liquid to gas
2. gas to liquid
3. solid to liquid
4. liquid to solid

Q. Which among the following has the strongest intermolecular force of attraction between its particles at the room temperature?

1. Chalk
2. Nitrogen
3. Mercury
4. Iron

Q. Complete the given flow chart regarding melting.​

1. P: increases​
   Q: increases
2. P: increases​
   Q: decreases
3. P: decreases​
   Q: decreases
4. P: decreases​
   Q: increases

Q. Which of the following is not a characteristic of fluids?

1. They have mass.
2. They can flow.
3. They are compressible.
4. They have a definite shape.

Q. Arrange the following in the decreasing order of particle sizes.
1. Milk in water
2. Salt in water
3. Flour in water

1. 3 > 1 > 2
2. 1 > 2 > 3
3. 2 > 3 > 1
4. 3 > 2 > 1

Q. Which of the following is not a characteristic of fluids?

1. They have mass.
2. They are compressible.
3. They have a definite shape.
4. They can flow.

Q. For ice to melt, heat energy needs to be removed from the ice.

1. True
2. False