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

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?

3.75 C

2.4 C

144 C

60 C

None

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

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.

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

To decrease the overall resistance of the heating element.

None

A conductor is considered 'non-ohmic' if:

It has a very high resistance value.

Its resistance changes as the current or voltage changes

It is made from a material other than copper.

It does not conduct electricity at all.

None

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

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 energy is dissipated in one second.

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

None

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

Regulate the voltage supplied to the appliance.

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

None

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

900,000 J

150 J

15,000 J

25 J

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

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 = 1/2RB

RA = 4RB

RA = 2RB

RA = 1/4RB

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?

Resistance, R

Electric Charge, Q

Conductance, 1/R

Power, P

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?

6 W

9600 W

1440 W

0.167 W

None

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