General Science Class 9 MCQS

The amount of heat needed to convert a substance from liquid to gas is called?

1. Heat of vaporization
2. Specific heat
3. Latent heat of fusion
4. All

Thermal energy transfer required per unit mass to increase the temperature by 1°C or 1 K is called?

1. Latent heat of Vaporization
2. Specific heat capacity
3. Latent heat of fusion
4. Thermal capacity

A fixed temperature at which a pure liquid boils is called :

1. Melting point
2. Freezing point
3. Boiling point
4. Both 'a' and 'b'

The melting point of ice at normal atmospheric pressure is :

1. 0 °C
2. 0 K
3. 100 °C
4. Both 'a' and 'b'

Thermal energy transfer required to change a liquid into gas without changing its temperature is called?

1. Latent heat of freezing
2. Latent heat of vaporization
3. Latent heat of boiling
4. Latent heat of melting

Evaporation can occur at :

1. Freezing point
2. Melting point
3. Boiling point
4. All temperatures

Rate of evaporation of a liquid can be increased by :

1. Increasing humidity
2. Decreasing temperature
3. Increasing its boiling point
4. Decreasing atmospheric pressure

Linear thermal expansion of a solid depend upon :

1. Increasing in temperature
2. Original length
3. Properties of material
4. All of these

Techniques for manipulation of gene to achieve desirable characters are called?

1. Biotechnology
2. Biochemistry
3. Genomics
4. Gene Therapy

Part of agriculture for the development of new varieties of plant, and their fruit is :

1. Agronomy
2. Floriculture
3. Horticulture
4. Pomology