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

What is the definition of one volt (1 V)?

A current of one ampere flows through a resistance of one ohm.

One joule of work is done to move one coulomb of charge between two points.

One ampere of current flows when one coulomb of charge passes a point

One joule of energy is dissipated in one second.

None

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

Changing the material from nichrome to silver.

Decreasing its length.

Increasing its temperature.

Increasing its diameter.

None

A conductor is considered 'non-ohmic' if:

Its resistance changes as the current or voltage changes

It does not conduct electricity at all.

It is made from a material other than copper.

It has a very high resistance value.

None

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

Convert electrical energy into light energy

Protect the appliance from excessive current by breaking the circuit.

Increase the resistance of the appliance to save energy.

Regulate the voltage supplied to the appliance.

None

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

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

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

None

A microwave oven operates on a 240 V supply and draws a current of 5.5 A. Which of the following standard fuses (1 A, 5 A, 10 A, 13 A) is the most appropriate choice for this appliance?

10 A

1 A

13 A

5 A

None

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

150 J

900,000 J

25 J

15,000 J

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?

144 C

60 C

2.4 C

3.75 C

None

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

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

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

To allow the wire to expand and contract without breaking.

To decrease the overall resistance of the heating element.

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

9600 W

0.167 W

6 W

None

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