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

A conductor is considered 'non-ohmic' if:

It does not conduct electricity at all.

Its resistance changes as the current or voltage changes

It is made from a material other than copper.

It has a very high resistance value.

None

A graph of potential difference (V) on the y-axis against current (I) on the x-axis is plotted for a constantan wire. What does the gradient of this graph represent?

Electric Charge, Q

Power, P

Resistance, R

Conductance, 1/R

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?

0.25V

135V

4.0V

8100V

None

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

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

One joule of energy is dissipated in one second.

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

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 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.

None

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

15,000 J

150 J

25 J

900,000 J

None

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

Protect the appliance from excessive current by breaking the circuit.

Convert electrical energy into light energy

Regulate the voltage supplied to the appliance.

Increase the resistance of the appliance to save energy.

None

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 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 decrease the overall resistance of the heating element.

None

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

Increasing its temperature.

Increasing its diameter.

Decreasing its length.

Changing the material from nichrome to silver.

None

10.

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

1 out of 10