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

15,000 J

25 J

900,000 J

150 J

None

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

Convert electrical energy into light energy

Regulate the voltage supplied to the appliance.

Increase the resistance of the appliance to save energy.

Protect the appliance from excessive current by breaking the circuit.

None

A conductor is considered 'non-ohmic' if:

It does not conduct electricity at all.

Its resistance changes as the current or voltage changes

It has a very high resistance value.

It is made from a material other than copper.

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

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 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.

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

None

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?

1 A

13 A

10 A

5 A

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?

3.75 C

2.4 C

60 C

144 C

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 conductivity.

High electrical resistance.

Low melting 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?

Power, P

Resistance, R

Electric Charge, Q

Conductance, 1/R

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?

0.167 W

9600 W

6 W

1440 W

None

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