1.
Pressure of gas decreases if:
A
Temperature increases
B
Volume decreases
C
Volume increases
D
Collisions increase
2.
Superconductivity was first discovered in:
A
Copper
B
Iron
C
Mercury
D
Silver
3.
Superconductors are mainly used in:
A
Electric heaters
B
Transformers
C
MRI machines
D
Electric bulbs
4.
Evaporation takes place at:
A
Boiling point only
B
Melting point
C
All temperatures
D
Freezing point
5.
In solids, particles are:
A
Far apart and free
B
Closely packed and vibrate about fixed positions
C
Completely free to move
D
Not moving at all
6.
According to the kinetic theory of matter, particles of matter are always in:
A
Rest
B
Circular motion
C
Random motion
D
Linear motion only
7.
Which state of matter has the strongest intermolecular forces?
A
Gas
B
Liquid
C
Solid
D
Plasma
8.
Which property disappears in superconductors?
A
Electric current
B
Voltage
C
Electrical resistance
D
Charge
9.
Water has maximum density at:
10.
Evaporation causes cooling because:
A
Temperature increases
B
High energy molecules escape
C
Pressure increases
D
Density increases
11.
At constant volume, pressure of a gas is directly proportional to:
A
Mass
B
Density
C
Temperature
D
Area
12.
Thermal expansion occurs due to:
A
Decrease in mass
B
Increase in density
C
Increase in kinetic energy of particles
D
Change in color
13.
Thermal expansion in liquids is measured by:
A
Linear expansion
B
Area expansion
C
Volume expansion
D
Mass expansion
14.
Which factor increases the rate of evaporation?
A
Low temperature
B
High humidity
C
Large surface area
D
Low wind speed
15.
Which material can act as a superconductor?
A
Copper
B
Iron
C
Lead
D
Wood
16.
When gas particles strike the walls of container, they exert:
A
Heat
B
Force
C
Energy
D
Mass
17.
During melting of ice, temperature:
A
Increases
B
Decreases
C
Remains constant
D
Becomes zero
18.
Which has higher latent heat of vaporization?
A
Water
B
Alcohol
C
Petrol
D
Mercury
19.
Which factor mainly increases the kinetic energy of gas molecules?
A
Pressure
B
Volume
C
Temperature
D
Mass
20.
When temperature of a gas increases, pressure increases because:
A
Mass increases
B
Collisions increase
C
Volume decreases
D
Density decreases