Kuiz Fizik Tingkatan 5 Bab 5 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 5 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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

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

The depletion layer disappears and the resistance becomes zero

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

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

None

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

240

1.5

150

None

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

To smooth the pulsating DC output.

To block the flow of direct current.

To rectify the alternating current

To increase the frequency of the output signal.

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 store electrical energy in an electric field.

To amplify a small current into a larger current.

To allow current to flow in only one direction.

None

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

Surface area of the cathode

Specific heat capacity of the cathode

Temperature of the cathode

Potential difference between cathode and anode

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.

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

An elliptical path.

A parabolic path.

None

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

Rectification

Photoelectric effect

Thermionic emission

Doping

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 off.

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

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

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

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 requires a lower input voltage to operate.

It is a simpler circuit with fewer components.

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

It produces a perfectly smooth DC output without a capacitor.

None

10.

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 increases

Its resistance becomes zero.

None

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