Kuiz Fizik Tingkatan 5 Bab 5 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 5 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

Which of the following factors, if increased, would lead to a decrease in the rate of thermionic emission?

Specific heat capacity of the cathode

Surface area of the cathode

Temperature of the cathode

Potential difference between cathode and anode

None

What is the main purpose of a semiconductor diode in a circuit?

To act as an automatic switch controlled by light or heat.

To allow current to flow in only one direction.

To amplify a small current into a larger current.

To store electrical energy in an electric field.

None

A transistor has three terminals: emitter (E), base (B), and collector (C). What is the primary role of the base?

To emit the majority of charge carriers

To control the flow of current between the emitter and collector

To provide the main power for the circuit.

To collect the charge carriers

None

A beam of cathode rays is directed into a uniform magnetic field that is perpendicular to the beam's velocity. What path will the electrons follow?

A circular path.

An elliptical path.

A parabolic path.

A straight line, as electrons are not affected by magnetic fields.

None

A full-wave bridge rectifier uses four diodes to convert AC to DC. What is the primary advantage of this setup over a half-wave rectifier that uses a single diode?

It is a simpler circuit with fewer components.

It produces a perfectly smooth DC output without a capacitor.

It utilizes both the positive and negative half-cycles of the AC input.

It requires a lower input voltage to operate.

None

What is the function of a capacitor placed in parallel with the load resistor in a rectifier circuit?

To rectify the alternating current

To smooth the pulsating DC output.

To block the flow of direct current.

To increase the frequency of the output signal.

None

In a light-controlled switch that turns on a bulb in the dark, a Light Dependent Resistor (LDR) is used. How does the resistance of the LDR change as it gets darker?

Its resistance remains constant.

Its resistance decreases.

Its resistance becomes zero.

Its resistance increases

None

A transistor circuit is used as a temperature-controlled switch for a fire alarm. The alarm should turn on when the temperature rises significantly. Which statement correctly describes the operation?

The thermistor’s resistance decreases with temperature, switching the transistor on.

The thermistor’s resistance increases with temperature, switching the transistor off.

The thermistor’s resistance increases with temperature, switching the transistor on.

The thermistor’s resistance decreases with temperature, switching the transistor off.

None

What is the phenomenon called when free electrons are emitted from a metal surface that has been heated to a high temperature?

Thermionic emission

Photoelectric effect

Doping

Rectification

None

10.

When a diode is in a reverse-biased configuration, what happens to its depletion layer and resistance?

The depletion layer becomes thinner and the resistance becomes very low.

The depletion layer width remains the same, but the resistance increases.

The depletion layer disappears and the resistance becomes zero

The depletion layer becomes wider and the resistance becomes very high.

None

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