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Physics UTME / JAMB 2025 Semi Conductor

Charge carriers in doped semiconductors are

A electrons and protons

B electrons and neutrons

C anions and cations

D electrons and holes

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Physics UTME / JAMB 2024 Semi Conductor

A rectifier is a device that changes

A D.C to D.C

B D.C to A.C

C A.C to A.C

D A.C to D.C

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Physics UTME / JAMB 2024 Semi Conductor

The process of adding impurities to a semiconductor material to increase its conductivity is

A Rectification

B Emission

C Doping

D Stabilization

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Physics UTME / JAMB 2024 Semi Conductor

Which of the following materials has a very large energy gap band?

A Conductor

B Insulator

C Semiconductor

D Intrinsic semiconductor

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Physics UTME / JAMB 2023 Semi Conductor

The number of holes in an intrinsic semiconductor

A is not equal to the number of free electrons

B is greater than the number of free electrons

C is equal to the number of free electrons

D is less than the number of free electrons

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Physics WAEC / WASSCE 2022 Semi Conductor

In doping an intrinsic semiconductor to produce a p-type semiconductor,

A the semiconductor is heated up

B a donor element is added

C an acceptor element is added

D the semiconductor is conducted to a battery

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Physics UTME / JAMB 2022 Semi Conductor

A semiconductor is formed by?

A co-ordinate bonds

B electrovalent bonds

C a substance free of bonds

D covalent bonds

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Physics WAEC / WASSCE 2016 Semi Conductor

In a p-type semiconductor, the?

A number of holes are equal to the number of electrons

B electrical resistivity increases

C electrons are the majority charge carriers

D holes are the majority charge carriers

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Physics UTME / JAMB 2010 Semi Conductor

Transistors are used for the?

A rectification of signals

B conversion of a.c to d.c

C amplification of signals

D conversion of d.c to a.c

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Physics UTME / JAMB 2010 Semi Conductor

Which of the following is a pure semiconductor?

A carbon

B silicon

C transistor

D phosphorus

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Physics UTME / JAMB 2009 Semi Conductor

Which of the following can conduct electricity owing to the presence of free mobile electrons?

A germanium

B silicon

C grapefruit

D copper

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Physics UTME / JAMB 2009 Semi Conductor

When a pentavalent impurity is added to a pure semiconductor, it becomes?

A a p-type semiconductor

B an n-type semiconductor

C an insulator

D an intrinsic semi-conductor

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Physics UTME / JAMB 2008 Semi Conductor

zener diode is used for?

A current amplification

B power amplification

C voltage regulation

D energy conversion

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Physics UTME / JAMB 2008 Semi Conductor

When a pure semiconductor is heated, its resistance?

A increases

B decreases

C remains the same

D increases and then decreases

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Physics UTME / JAMB 2008 Semi Conductor

I. for current amplification. II. for voltage stabilization. III. for power amplification. IV. as a switch. which of the above are the uses of transistor?

A I,II,III and IV

B I,III, and IV only

C I, II and III only

D I,II and IV only

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