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

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 resistance.

Low melting point.

High electrical conductivity.

It is a non-ohmic conductor

None

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

To decrease the overall resistance of the heating element.

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

To allow the wire to expand and contract without breaking.

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

None

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

6 W

9600 W

0.167 W

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?

13 A

5 A

1 A

10 A

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 has a very high resistance value.

It is made from a material other than copper.

None

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

135V

0.25V

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 = 4RB

RA = 1/4RB

RA = 1/2RB

RA = 2RB

None

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

150 J

15,000 J

900,000 J

25 J

None

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

One joule of energy is dissipated in one second.

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

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

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

None

10.

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

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.

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

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

None

1 out of 10