Kuiz Fizik Tingkatan 5 Bab 5 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 5 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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 requires a lower input voltage to operate.

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

It produces a perfectly smooth DC output without a capacitor.

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 increases with temperature, switching the transistor off.

The thermistor’s resistance decreases 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 on.

None

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

Potential difference between cathode and anode

Temperature of the cathode

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

A circular path.

A parabolic path.

An elliptical path.

None

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

To amplify a small current into a larger current.

To allow current to flow in only one direction.

To store electrical energy in an electric field.

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

None

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 disappears and the resistance becomes zero

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

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

None

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

To control the flow of current between the emitter and collector

To collect the charge carriers

To emit the majority of charge carriers

To provide the main power for the circuit.

None

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

To increase the frequency of the output signal.

To rectify the alternating current

To smooth the pulsating DC output.

To block the flow of direct current.

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

Doping

Rectification

Photoelectric effect

None

10.

The current amplification factor (β) of a transistor is the ratio of the collector current (IC) to the base current (IB). If IB = 40μA and IC = 6.0mA, what is the value of β?

0.0067

1.5

150

240

None

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