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:

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.

It has a very high resistance value.

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?

135V

0.25V

4.0V

8100V

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

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 = 1/4RB

RA = 1/2RB

RA = 4RB

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 allow the wire to expand and contract without breaking.

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.

None

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

Changing the material from nichrome to silver.

Increasing its temperature.

Increasing its diameter.

Decreasing its length.

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?

0.167 W

6 W

1440 W

9600 W

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

One joule of energy is dissipated in one second.

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

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

Power, P

Conductance, 1/R

None

10.

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

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