Kuiz Fizik Tingkatan 5 Bab 5 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 5 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

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 parabolic path.

An elliptical path.

A circular path.

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 produces a perfectly smooth DC output without a capacitor.

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

None

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

Doping

Rectification

Photoelectric effect

Thermionic emission

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 provide the main power for the circuit.

To emit the majority of charge carriers

To collect the charge carriers

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 on.

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

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

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

None

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

To block the flow of direct current.

To increase the frequency of the output signal.

To smooth the pulsating DC output.

To rectify the alternating current

None

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

Potential difference between cathode and anode

Temperature of the cathode

Surface area of the cathode

Specific heat capacity of the cathode

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 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.

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 allow current to flow in only one direction.

To amplify a small current into a larger current.

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 decreases.

Its resistance increases

Its resistance remains constant.

Its resistance becomes zero.

None

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