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

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

One joule of energy is dissipated in one second.

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

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.

None

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

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

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?

2.4 C

60 C

144 C

3.75 C

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?

Power, P

Conductance, 1/R

Resistance, R

Electric Charge, Q

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?

High electrical resistance.

Low melting point.

High electrical conductivity.

It is a non-ohmic conductor

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?

9600 W

0.167 W

1440 W

6 W

None

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

Changing the material from nichrome to silver.

Increasing its diameter.

Increasing its temperature.

Decreasing its length.

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

0.25V

135V

8100V

None

10.

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 = 1/2RB

RA = 2RB

RA = 4RB

RA = 1/4RB

None

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