Types of Machines - JSS2 Basic science Past Questions and Answers - page 1
According to the kinetic theory, what happens to particles in matter when it's heated?
They slow down
They vibrate in place
They gain kinetic energy
They disappear into nothingness
Why do substances expand when heated, according to the kinetic theory?
Because their particles slow down
Because their particles disappear
Because their particles gain kinetic energy
Because their particles stop moving
What causes pressure in a gas, as per the kinetic theory?
Particles sticking together
Particles vibrating in place
Particles colliding with the container walls
Particles turning into vapor
At what point does boiling occur, according to the kinetic theory?
When the vapor pressure is lower than atmospheric pressure
When the vapor pressure equals the atmospheric pressure
When the vapor pressure is higher than atmospheric pressure
When the liquid freezes
How does the kinetic theory explain the process of boiling?
By particles freezing together
By particles gaining kinetic energy
By particles slowing down
By particles disappearing into vapor
In evaporation, what particles escape from the liquid's surface?
Low-energy particles
Random particles
Particles with insufficient energy
High-energy particles
When does evaporation occur, based on the kinetic theory?
Only at high temperatures
Only at low temperatures
At any temperature
Only during boiling
How does the kinetic theory explain the cooling effect of evaporation?
By raising the temperature
By lowering the temperature
By increasing pressure
By expanding the liquid
What happens to the average kinetic energy of remaining liquid during evaporation?
It decreases
It increases
It remains constant
It disappears
What determines which particles escape during evaporation?
Particle size
Particle shape
Particle color
Particle energy