WA2 Sci Revision

What is the energy conversion in a solar panel?
______ energy to electrical energy

Rui Tai pushes against a wall. Which statement is true?

• He does a lot of work as he gets tired pushing it for 10 minutes.

• There is no work done as the wall does not move.

• There is negative amount of work done.

• Work is done as it is independent of the direction of the force applied.

When an object is heated, ______ increases.

• volume

• mass

• density

• weight

When an object is heated, ______ decreases.

• volume

• mass

• density

• weight

When water is heated, it ______ as _______ decreases.

• sinks, density

• sinks, mass

• rises, density

• rises, volume

This type of heat transfer does not require a medium.

• conduction

• convection

• convention

• radiation

The diagram shows the formula to calculate effective resistance

• when resistors are connected in parallel.

• when resistors are connected in series.

• when variable resistors are connected.

• when resistors are connected side by side.

Two resistors are connected in series. Each resistor has a value of 2 Ω. Find the effective resistance in the circuit.

• 2 Ω

• 1 Ω

• 4 Ω

• 6 Ω

Two resistors are connected in series. Each resistor has a value of 4 Ω. Find the effective resistance in the circuit.

• 2 Ω

• 4 Ω

• 8 Ω

• 16 Ω

Two resistors are connected in series. One resistor has a value of 4 Ω and the other has a value of 2 Ω. Find the effective resistance in the circuit.

• 2 Ω

• 4 Ω

• 6 Ω

• 8 Ω