Junior 2 Physics

How is thermal energy transferred between X and Y?

• by conduction and convection.

• by conduction only.

• by convection only.

• by radiation only.

A seesaw is unbalanced with two people of different masses sitting equal distances from the centre. Which of the following will result in equilibrium?

• The larger person moving further away from the centre.

• Moving the smaller person closer to the centre.

• Moving the smaller person further from the centre.

The centre of gravity of each object is labelled M. Which is not in equilibrium and will therefore fall over?

• A

• B

• C

• D

There is a significant risk to submarines which dive to very great depths. Why is it dangerous to do this?

• The temperature of water is too low at greater depths.

• The density of water is less at greater depths.

• The pressure is too great at greater depths.

• The gravitational pull increases at greater depths.

What 3 colors of light would produce white light?

• Red, Yellow, Blue

• Red, Yellow, Green

• Red, Blue, Green

• Red, Orange, Yellow

If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

• A positive charge.

• A negative charge.

• A neutral charge.

• No charge at all.

If you replace the paper clip with a plastic spoon, what will happens?

• The bulb doesn't light

• The bulb is dimmer

• The wires get hot

• The bulb still light up

A student placed a pencil in a cup of water. The pencil appears broken because light_________________.

• always travels in a straight line

• makes the water in the glass evaporate

• bends when it passes through water

• reflects the pencil on the water's surface

The water is heated strongly at the top, but the ice only melts very slowly. Why does the ice melt so slowly?

• Thermal energy always travels upwards.

• Hot water is more dense than cold water.

• Metal gauze does not allow heat to pass through.

• Water is a poor thermal conductor.

In which container does the water exert the greatest liquid pressure on the base of the container?

• A

• B

• C

• A.The liquid pressure is the same in all three.