### SAT - Science - Physics - Heat

#### Question - 1

When the temperature increases the density of a substance

• A decreases
• B increases
• C first increase then decreases
• D first decrease then increases

#### Question - 2

Two spheres of the same size are made of the same metaI, but one is hollow and the other is solid. When they are heated to the same temperature

• A solid sphere will expand more
• B hollow sphere will expand more
• C only the solid sphere will expand
• D both spheres will expand almost equally

#### Question - 3

With the increase of temperature, coefficient of linear expansion always

• A increases
• B double itself
• C decreases
• D remains the same

#### Question - 4

The rate of evaporation of water when it is placed under partial vacuum without changing the temperature will

• A drop to zero
• B decrease
• C increase
• D remain unaffected

#### Question - 5

When water is heated from 00C, its volume

• A remains the same
• B decrease till 40C
• C increases
• D first increases then decreases

#### Question - 6

Steam at 100°C causes more severe burns than water at the same temperature because

• A steam gives more heat
• B steam cannot do work
• C steam is a gas
• D steam is highly combustible

#### Question - 7

When salt is properly mixed with ice, the melting point of ice

• A lowered
• B raised
• C becomes infinite
• D remains the same

#### Question - 8

Glaciers always melt first at the

• A top surface
• B sides
• C bottom
• D middle surface

#### Question - 9

When the coffee in thermos flask is vigorously shaken then the temperature of the coffee will

• A fall
• B increase slightly
• C remain the same
• D never be determined

#### Question - 10

When an inflated tyre bursts, the air escaping out

• A will be liquified
• B will be heated
• C will be cooled
• D will not undergo any change