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 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 decrease the overall resistance of the heating element.

To allow the wire to expand and contract without breaking.

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

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?

It is a non-ohmic conductor

High electrical resistance.

High electrical conductivity.

Low melting point.

None

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

Protect the appliance from excessive current by breaking the circuit.

Increase the resistance of the appliance to save energy.

Convert electrical energy into light energy

Regulate the voltage supplied to the appliance.

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?

4.0V

8100V

135V

0.25V

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

Decreasing its length.

Changing the material from nichrome to silver.

Increasing its temperature.

Increasing its diameter.

None

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

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.

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

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?

Conductance, 1/R

Resistance, R

Power, P

Electric Charge, Q

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 = 2RB

RA = 1/2RB

RA = 4RB

RA = 1/4RB

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?

10 A

1 A

13 A

5 A

None

1 out of 10