Sec 2 Science Electrical System and Digestive System (1)

Which bulb is the dimmest?

• Left

• Centre

• Right

Answer explanation

Resistors in parallel lowers the overall resistance of the circuit.

Which of the following measures the amount of electric charge flowing through a circuit?

• Volt meter

• Ammeter

• Resistor

• Wire

What does this diagram represent?

• Fixed resistor

• Variable resistor

• Ammeter

• Voltmeter

Which of the following statements is correct?

• Variable resistors have a fixed resistance.

• A circuit connected in series has more than one path for current flow.

• Heating elements are made of high-resistance material.

• The less coils on the electromagnet, the stronger the magnetism.

Which of the following about the voltmeter is true?

• It is must be connected in parallel to the cell to measure its potential difference.

• It measures the amount of current flowing through a circuit.

• It has variable resistance.

• Its positive terminal must be connected to the negative terminal of the cell.

From the diagram, at the end of the electroplating process, the silver spoon is

• completely dissolved in the solution.

• lighter than before the process.

• now an insulator.

• coated with a thin layer of gold.

Which of the following statements about the fuse is true?

• The fuse increases the amount of current flowing through the circuit.

• If the current flowing is too large, the wire in the fuse melts.

• The wire is made of an insulating material, preventing too much current from flowing.

• The same fuse can be used over and over again after it breaks a circuit.

Which of the following statements is FALSE?

The circuit breaker

• turns off by itself when the current is too small.

• stops current from flowing when the current is too large.

• is an electrical safety device found in individual households.

• can be easily reset to resume normal operation.

Which of the following is NOT one of the nutrients our body get from food?

• carbohydrates

• fats

• insulin

• proteins

The enzyme in our body that is needed for the digestion of fats is

• carbohydrases

• proteases

• fatty acids

• lipase