Kuiz Sains Tambahan Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 7 Set 1

Elektrik (English)

KUIZ INI MENGANDUNGI 10 SOALAN

Which statement correctly describes the relationship defined by Ohm's Law for an ohmic conductor?

The potential difference across the conductor is directly proportional to the current flowing through it, provided physical conditions remain constant.

The potential difference across the conductor is inversely proportional to the current flowing through it.

The current flowing through the conductor is directly proportional to the resistance.

The resistance of the conductor is directly proportional to the current flowing through it.

None

Which of the following changes would increase the electrical resistance of a metallic conductor?

Changing the material from nichrome to silver.

Increasing its temperature.

Increasing its diameter.

Decreasing its length.

None

What is the primary reason for coiling the wire of a heating element in an appliance like an electric kettle?

To allow the wire to expand and contract without breaking.

To create a magnetic field that helps heat the water faster.

To decrease the overall resistance of the heating element.

To fit a very long wire into a compact space to achieve high total resistance.

None

An electric current of 0.8 A flows through a lamp for 3 minutes. What is the total electric charge that passes through the lamp?

2.4 C

3.75 C

60 C

144 C

None

Nichrome is often used for heating elements in appliances like toasters and electric kettles. Which property of nichrome makes it suitable for this purpose?

High electrical conductivity.

It is a non-ohmic conductor

Low melting point.

High electrical resistance.

None

A conductor is considered 'non-ohmic' if:

It is made from a material other than copper.

It has a very high resistance value.

It does not conduct electricity at all.

Its resistance changes as the current or voltage changes

None

An electric heater has a power rating of 1500 W. How much electrical energy does it consume in 10 minutes?

15,000 J

900,000 J

150 J

25 J

None

The main purpose of a fuse in an electrical appliance is to:

Increase the resistance of the appliance to save energy.

Protect the appliance from excessive current by breaking the circuit.

Regulate the voltage supplied to the appliance.

Convert electrical energy into light energy

None

Two copper wires, A and B, have the same length. Wire A has twice the diameter of wire B. How does the resistance of wire A (RA) compare to the resistance of wire B (RB)?

RA = 1/4RB

RA = 1/2RB

RA = 4RB

RA = 2RB

None

10.

A toaster has a heating element with a resistance of 40Ω. If it is connected to a 240 V power supply, what is its power dissipation?

1440 W

0.167 W

9600 W

6 W

None

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