Which statement describes what happens as ice at 0 C starts to melt to become water?
Energy is absorbed and the temperature remains constant.
Energy is absorbed and the temperature rises.
Energy is released and the temperature remains constant.
Energy is released and the temperature rises.
Which quantity gives the thermal capacity of a beaker?
the thermal energy required to change the state of the beaker at constant temperature
the thermal energy required to raise the temperature of the beaker by 1 C
the total mass of hot liquid that the beaker can hold
the total volume of hot liquid that the beaker can hold
In an experiment, a thermometer is placed in a test-tube of hot liquid. The temperature of the liquid is recorded every half minute. The table shows the results.
Equal masses of two different liquids are put into identical beakers.
Liquid 1 is heated for 100 s and liquid 2 is heated for 200 s by heaters of the same power.
The temperature of both liquids increases by the same amount.
Which statement is correct?
Both liquids receive the same amount of energy.
Liquid 1 receives more energy than liquid 2.
Both liquids have equal thermal capacity.
The thermal capacity of liquid 1 is less than the thermal capacity of liquid 2.
A rod is made half of glass and half of copper. Four pins, A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. Which pin falls off first?
Which process involves convection?
bread toasting under a grill
energy from the Sun warming a road surface
hot air rising to the top of a cool room
thermal energy transfer through a copper bar
The air in a room is heated by a heater. The diagram shows the circulation of the air in the room. Which statement about the air that is heated is correct?
The air contracts and becomes less dense.
The air contracts and becomes more dense.
The air expands and becomes less dense.
The air expands and becomes more dense.
What is the name of the process of heat transfer using electromagnetic waves?
Two states of matter are described as follows.
In state 1, the molecules are very far apart. They move about very quickly at random in straight lines until they hit something.
In state 2, the molecules are quite closely packed together. They move about at random. They do not have fixed positions.
What is state 1 and what is state 2?
State 1 is gas and state 2 is liquid
State 1 is gas and state 2 is solid
State 1 is liquid and state 2 is gas
State 1 is solid and state 2 is liquid
The diagram represents molecules of gas moving in a container. What happens to the gas molecules when the temperature of the gas increases?
They vibrate more quickly.
They vibrate more slowly.
They move more slowly.
They move more quickly.
A sealed gas cylinder is left outside on a hot, sunny day.
What happens to the average speed of the molecules and to the pressure of the gas in the
cylinder as the temperature rises?
speed decrease, pressure decrease
speed decrease, pressure increase
speed increase, pressure decrease
speed increase, pressure increase
The diagrams represent the molecules in two different states of matter. The arrows show the motion of the molecules. What is state 1 and what is state 2?
State 1 is gas, state 2 is liquid
State 1 is gas, state 2 is solid
State 1 is liquid, state 2 is gas
State 1 is liquid, state 2 is solid
A helium filled weather balloon is held at ground. The volume of balloon is 3600 . The pressure of helium is 100 kPa. The balloon is released and rise to height where the volume of the balloon is 7200 . Calculate the new pressure of helium. (Assume temperature is constant).
To mark a temperature scale on a thermometer, standard temperatures known as fixed points are needed.
Which of these is a fixed point on the Celsius scale?
the temperature inside a freezer
the temperature of pure melting ice
the temperature of pure warm water
The thermal capacity of solid Y is greater than that of solid Z.
What is a consequence of this?
Solid Y needs less thermal energy to melt it than solid Z.
Solid Y needs more thermal energy to melt it than solid Z.
Solid Y needs less thermal energy to raise its temperature by 1 ºC than solid Z.
Solid Y needs more thermal energy to raise its temperature by 1 ºC than solid Z.
A rod is made of copper and wood joined together. The rod is heated at the join in the centre for about a minute.
At which labelled point will the temperature be lowest, and at which point will it be highest?
P is lowest and Q is highest
P is lowest and R is highest
S is lowest and P is highest
S is lowest and R is highest
The same quantity of thermal (heat) energy is given to two objects X and Y. The temperature rise of object X is less than the temperature rise of object Y.
What accounts for this difference?
X has a larger thermal capacity than Y.
X is a better thermal conductor than Y.
Y has a larger thermal capacity than X.
Y is a better thermal conductor than X.
The following are the ways to increase the sensitivity of thermometer, except
make smaller capillary
use less dense liquid
use more dense liquid
make bigger bulb
The quantity of heat needed to change unit mass from liquid to vapour without change of temperature is called _________
Specific latent heat of freezing
Specific latent heat of vaporation
Specific latent heat of fusion
Specific latent heat of condensation
Take a look of the following graph!
What is happening in (B) ?
The temperature of ice rising
The water is boiling
The ice is melting
The water is evaporate
The movement of tiny grains of dust because it collides with fast moving air particles is called?
When a hot object get in contact with cold object the temperature of both object will become same. What is the term for this equilibrium?
Rail ways bar is always placed with some gap between them. What is the reason of this?
At hot temperature the bar will get shorter
At cold temperature the bar will get longer
At hot temperature the bar will get longer
at hot temperature the length will be the same
It takes 4000 J to turn 8 g of water at 100°C into steam. Calculate the specific latent heat of vaporation of water?
The diagram shows a quantity of gas trapped in a cylinder. The piston is pushed in slowly and the gas is compressed. The temperature of the gas does not change. Which graph shows the relationship between the pressure and the volume of the gas?
The diagram shows a sealed jar containing a gas. Which statement about the gas in the jar is correct?
The gas molecules move more slowly as the temperature increases
The gas molecules collide with the inside of the jar more often as the temperature increases.
The pressure of the gas decreases as the temperature increases.
The pressure of the gas is higher at the top of the jar than at the bottom of the jar.
Change the upper and lower fixed point is called _________.
Change in length or volume per degree is called ____________.
What the following is the unit for specific latent heat?
Inside a thermometer there is liquid. What is the name of that liquid?