Hello Friends !!! I am from quickstudyhelper.com. In today’s post, we are going to see 85 important ‘Introduction to Solid Engineering Physics MCQs’ which help you in your examination. If you are preparing for a competition exam, board exam, and engineering exam then you can read these MCQs.
RGPV Unit – 3 Introduction to Solid MCQs
Q1. _____can be used for the measurement of the strength of the magnetic field.
- Zener diode
- Hall effect
- K. P. Model
- Solar cell
Answer:- 2) Hall effect
Q2. A solar cell converts the optical energy into the
- mechanical energy
- chemical energy
- electrical energy
- optical energy
Answer:- 3) electrical energy
Q3. _____ is made by heavily doped P and N-type semiconductors.
- Zener diode
- Hall effect
- K P Model
- Solar cell
Answer:- 1) Zener diode
Q4. _____ has an empty conduction band and a filled valence band with a very narrow gap.
- Conductor
- Insulator
- Semiconductor
- All of these
Answer:- 3) Semiconductor
Q5. The solid having a bond gap 3eV exhibit negligible low electrical conductivity at all temperature is called
- Conductor
- Insulator
- Semiconductor
- All of these
Answer:- 2) Insulator
Q6. _____ is a solid in which the conduction band and valence band overlap and there is no energy gap between the two bands.
- Conductor
- Insulator
- Semiconductor
- All of these
Answer:- 1) Conductor
Q7. How many types of semiconductors?
- Three
- Four
- One
- Two
Answer:- 4) Two
Q8. N-type semiconductors are known as
- Acceptor
- Donar
- Both 1 & 2
- None
Answer:- 2) Donar
Q9. P-type semiconductors are known as
- Acceptor
- Donar
- Both 1 & 2
- None
Answer:- 1) Acceptor
Q10. The high occupied energy level is called
- Valence band
- Fermi level
- Conduction band
- Extrinsic semiconductor
Answer:- 2) Fermi level
Q11. How many types of biasing in the P-N junction diode
- Two
- Three
- Four
- Five
Answer:- 2) Three
Q12. To obtain p-type silicon semiconductor, we need to dope pure silicon with
- aluminium
- phosphorus
- oxygen
- germanium
Answer:- 1) aluminium
Q13. On applying a reverse bias to a junction diode, it
- lowers the potential barrier
- raise the potential barrier
- increases the majority carrier current
- increases the minority carrier current
Answer:- 2) raise the potential barrier
Q14. What happens during the regulation action of a Zener diode?
- the current through the series resistance changes
- the resistance offered by the Zener changes
- the Zener resistance is constant
- both 1 & 2
Answer:- 4) both 1 & 2
Q15. Solar cells is also called
- Photovoltaic cell
- Electrical cell
- Chemical cell
- None of these
Answer:- 1) Photovoltaic cell
Q16. Hall effect can be used to measure _____ field.
- electrical field
- magnetic field
- chemical field
- physical field
Answer:- 2) magnetic field
Q17. Hall coefficient formula is
- ne
- 1/ne
- -ne
- -1/ne
Answer:- 4) -1/ne
Q18. A semiconductor has generally _____ valence electrons.
- two
- five
- one
- four
Answer:- 4) four
Q19. When a pentavalent impurity is added to a pure semiconductor, it becomes
- an insulator
- an intrinsic semiconductor
- p-type semiconductor
- n-type semiconductor
Answer:- 4) n-type semiconductor
Q20. Addition of pentavalent impurity to a semiconductor creates many
- free electrons
- holes
- valence electrons
- bound electrons
Answer:- 1) free electrons
Q21. Addition of trivalent impurity to a semiconductor creates many
- free electrons
- holes
- valence electrons
- bound electrons
Answer:- 2) holes
Q22. In the depletion region of a P-N junction, there is a shortage of
- acceptor ions
- holes and electrons
- donor ions
- none of the above
Answer:- 2) holes and electrons
Q23. With forwarding bias to a P-N junction, the width of the depletion layer
- decreases
- increases
- remains the same
- none of the above
Answer:- 1) decreases
Q24. Who discovered the Hall effect?
- Heinrich Hertz
- Edward Jenner
- Thomas Young
- Physicist Edwin Hall
Answer:- 4) Physicist Edwin Hall
Q25. When a forward bias is applied to a
crystal diode, it
- raises the potential barrier
- lowers the potential barrier
- reduces the majority carrier current
- none of these
Answer:- 2) lowers the potential barrier
Q26. Avalanche breakdown in a crystal diode occurs when
- the potential barrier is reduced to a zero
- forward current exceeds a certain value
- reverse bias exceeds a certain value
- all of these
Answer:- 3) reverse bias exceeds a certain value
Q27. A Semiconductor is electrically neutral because it has
- majority Carries
- no majority carriers
- equal no of positive & negative carries
- no free carrier
Answer:- 4) no free carrier
Q28. When the temperature of an intrinsic semiconductor is increased
- resistance of semiconductor is also increased
- conductivity is decreased
- energy of atoms is increased
- holes are created
Answer:- 3) energy of atoms is increased
Q29. The conduction band of a semiconductor material may be
- completely filled
- partially filled
- empty
- either 2 & 3
Answer:- 3) empty
Q30. In an intrinsic semiconductors, the fermi level lies
- in the middle of conduction band & valence band
- near CB
- near VB
- none of these
Answer:- 1) in the middle of the conduction band & valence band
Q31. Which of the following atoms can be used as a p-type impurity.
- Boron
- Arsenic
- Antimony
- Phosphorus
Answer:-1) Boron
Q32. The energy bond which possesses the free electron is called
- Valance band
- Conduction band
- Forbidden band
- None of these
Answer:- 2) Conduction band
Q33. Which of the following behaves as insulate?
- Diamond
- Germanium
- Silicon
- Silver
Answer:- 1) Diamond
Q34. In a semiconductor
- there are no free electrons at 0 k
- no free elenchus at any temperature
- the number of free electrons increases with pressure
- the number of free electrons to more than that in a Conductor
Answer:- 1) there are no free electrons at 0 k
Q35. Electric conduction in a Semiconductor takes place due to
- Elections only
- Holes only
- Both electrons & holes
- Neither electrons nor holes
Answer:- 1) Both electrons & holes
Q36. What is the resistivity of a pure semiconductor at absolute zero?
- Infinity
- Same as that of Conductors at room temperature
- Same as that of insulators at non temperature.
- Zero
Answer:- 1) Infinity
Q37. The mobility of free elections is greater than that of free holes because
- they are light
- they carry negative change
- they mutually collide loss
- they require low energy to continue their motion
Answer:- 1) they are light
Q38. The relation b/w number of free electrons in a Semiconductor and temperature given by
- n directly proportional T
- n directly proportional T½
- n directly proportional T³
- n directly proportional T³/²
Answer:- 1) n directly proportional T
Q39. One serious drawback of semi-conductor devices is
- they do not cast for long time
- they are costly
- they can not be used with high voltage
- they pollute the environment
Answer:- 3) they can not be used with high voltage
Q40. The Drift Current in a p-n Junction forms the
- n-side to the p-side
- p-side to the n-side
- n-side to the p-side of the Junction is forward biased and in the opposite direction if it is reversed
- p-side to n-side if the junction is forward biased and in the opposite direction if is reverse biased
Answer:- 1) n-side to the p-side
Q41. Diffusion Current in a P-N Junction is greater than drift current in magnitude.
- If the junction is forward biased
- If the junction is reversed biased
- If the Junction is unbiased
- In no Case
Answer:- 2) If the junction is reversed biased
Q42. Zener Diode is used for
- amplification
- rectification
- stabilisation
- all of the above
Answer:- 4) all of the above
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Q43. The depletion region of P-N Junction is one that is depleted of
- tom
- mobile charges
- no mobile charges
- velocity of the carries
Answer:- 3) no mobile charges
Q44. A Silicon P-N Junction in forwarding conduction has a voltage drop closer to
- 0.7 v
- 1.7 v
- 2.1 v
- 1.2 v
Answer:- 1) 0.7 v
Q45. The Leakage current of a P-N Junction is caused by
- Heat energy
- Chemical energy
- Barrier potential
- Majority Carriers
Answer:- 1) Heat energy
Q46. The resistivity of semiconductors depends on
- Shape of the semiconductor
- Atomic nature of semiconductor
- Width of Semiconductor
- Length of Semiconductor
Answer:- 2) Atomic nature of semiconductor
Q47. In diode reverse current is due to
- Mobile donor ions
- Mobile acceptor ions
- Minority carriers
- Majority carriers
Answer:- 3) Minority carriers
Q48. Doping of Zener diode is
- Heavy doping
- Low Doping
- No doping
- Both 1 & 2
Answer:- 1) Heavy doping
Q49. In Zener, diode current is controlled by
- Zenes voltage
- External load resistance
- Zener resistance
- By reverse voltage
Answer:- 2) External load resistance
Q59. In Zener diode, Zones Breakdown takes place
- Above 6v
- Below 6v
- Above 8v
- Below 8v
Answer:- 2) Below 6v
Q60. A Zener diode when used in voltage regulation is biased in
- Reverse breakdown region
- Forward bias region
- Forward bias constant current mode
- Reverse bias region below the Breakdown voltage
Answer:- 1) Reverse breakdown region
Q61. The Breakdown voltage of the Zener diode is controlled by
- Doping level
- Current
- Voltage
- Both 1 & 2
Answer:- 1) Doping level
Q62. Zener diode maximum current is obtained when loading resistance
- Infinite
- Becomes zero
- High
- Low
Answer:- 4) Low
Q63. In a PN junction with no external voltage, the electric field between acceptor and donor ions is called a
- Peak
- Barrier
- Threshold
- Path
Answer:- 2) Barrier
Q64. The reverse current in a diode is of the order of
- KA
- MA
- μA
- A
Answer:- 3) μA
Q65. A crystal diode is used as
- An Amplifier
- A rectifier
- An Oscillater
- A voltage regulator
Answer:- 2) A rectifier
Q67. The temperature of a crystal diode increases then the leakage current
- Remains the Same
- Becomes zero
- Decreases
- Increases
Answer:- 4) Increases
Q68. If the doping level of a crystal diode is increased, the breakdown voltage
- Remains the same
- Is Increased
- Is decreased
- None of these
Answer:- 3) Is decreased
Q68. The doping level in a Zener diode is that of a crystal diode
- Less than
- More than
- Same
- None of the above
Answer:- 2) More than
Q69. A Zener diode is used as
- As amplifier
- A voltage regulator
- A rectifier
- A multivibrator
Answer:- 2) A voltage regulator
Q70. In the breakdown region a Zener diode behaves like a source
- Constant voltage
- Constant current
- Constant resistance
- None of the above
Answer:- 1) Constant voltage
Q71. A Zener diode is destroyed if it
- forward biased
- reverse biased
- carrier more than rated current
- none of these
Answer:- 3) carrier more than rated current
Q72. Series resistance is connected in the Zener circuit to
- properly reverse bias the zener
- protect the Zener
- properly forward bias the zener
- none of these
Answer:- 2) Protect the Zener
Q73. A Zener diode has a breakdown voltage
- Undefined
- Sharp
- Zero
- Defined
Answer:- 2) Sharp
Q74. A Zener diode is a device
- A nonlinear
- A linear
- An amplifying
- None of these
Answer:- 1) A nonlinear
Q75. Solar cells are used as a source of power in the earth satellite because they have
- Very high efficiency
- Unlimited life
- Higher Power capacity per weight
- Both 2 & 3
Answer:- 4) Both 2 & 3
Q76. Which of the following, has the lowest temperature coefficient of resistivity?
- Copper
- Silver
- Gold
- Aluminum
Answer:- 3) Gold
Q77. In a metal,
- The electrical conduction is by electrons and holes
- With rising in temperature, the conductivity decreases
- The conduction band is empty
- There is a small energy gap between the two bnds
Answer:- 2) With rising in temperature, the conductivity decreases
Q78. The forbidden energy gap in semiconductors:
- Lies just below the valence band
- Is the same as the valence band
- Lies just above the conduction band
- Lies between the valence band and the conduction band
Answer:- 4) Lies between the valence band and the conduction band
Q79. The unit of mobility of charge carriers is
- m²/volt-sec
- m/volt-sec²
- m³/volt-sec
- m/volt-sec
Answer:- 1) m²/volt-sec
Q80. A semiconductor is electrically neutral because it has
- large number of holes
- a few hole and same number of electrons
- acts as an insulator
- acts as metallic character
Answer:- 3) Acts as an insulator
Q81. Which of the following atoms can be used as a p-type impurity
- Boron
- Arsenic
- Antimony
- Phosphorus
Answer:- 1) Boron
Q82. Due to illumination of light, the electron and hole concentration in a heavily doped n-type semiconductor, increase by ∆n and ∆p respectively. If ni is the intrinsic concentration, then
- ∆n<∆p
- ∆n>∆p
- ∆n=∆p
- ∆n×∆p=n²
Answer:- 4) ∆n×∆p=n²
Q83. Which of the following can be used in series with a Zener diode so that combination has almost zero temperature coefficient?
- Diode
- Resistor
- Transistor
- MOSFET
Answer:- 1) Diode
Q84. Zener diodes are also known as
- Voltage regulators
- Forward bias diode
- Breakdown diode
- None of the them
Answer:- 3) Breakdown diode
Q85. The ratio of reverse resistance and forward resistance of a germanium crystal diode is about
- 1 : 1
- 100 : 1
- 1000 : 1
- 40,000 : 1
Answer:- 4) 40,000 : 1
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