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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

1.

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

900,000 J

15,000 J

25 J

150 J

None

2.

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?

60 C

3.75 C

144 C

2.4 C

None

3.

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

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

To decrease the overall resistance of the heating element.

To allow the wire to expand and contract without breaking.

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

None

4.

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

Increase the resistance of the appliance to save energy.

Convert electrical energy into light energy

Protect the appliance from excessive current by breaking the circuit.

Regulate the voltage supplied to the appliance.

None

5.

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

6.

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

Low melting point.

High electrical conductivity.

It is a non-ohmic conductor

High electrical resistance.

None

7.

A conductor is considered 'non-ohmic' if:

It does not conduct electricity at all.

It is made from a material other than copper.

Its resistance changes as the current or voltage changes

It has a very high resistance value.

None

8.

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 joule of energy is dissipated in one second.

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

None

9.

A battery does 180 J of work to move 45 C of charge through a component in a circuit. What is the potential difference across the component?

8100V

4.0V

0.25V

135V

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?

0.167 W

9600 W

1440 W

6 W

None

1 out of 10

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