MCQOPTIONS
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MCQOPTIONS
This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An OP-AMPs can amplify |
| A. | D.C. |
| B. | A.C. |
| C. | Both A.C. & D.C. |
| D. | None of the above |
| Answer» C. Both A.C. & D.C. | |
| 2. |
An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a _ |
| A. | Non-inverting voltage at output |
| B. | Reference voltage on the other |
| C. | Virtual input |
| D. | Output |
| Answer» C. Virtual input | |
| 3. |
Acceptor and donor impurities donate |
| A. | N-carriers only |
| B. | P-carriers only |
| C. | P-carriers and n-carriers respectively |
| D. | N-carriers and p-carriers respectively |
| Answer» D. N-carriers and p-carriers respectively | |
| 4. |
Depletion region of a junction is formed |
| A. | During the manufacturing process |
| B. | Under forward bias |
| C. | Under reverse bias |
| D. | When temperature varies |
| Answer» B. Under forward bias | |
| 5. |
Electrons present in p-type material due to thermal pair generation are |
| A. | Majority carriers |
| B. | Minority carriers |
| C. | Dual carriers |
| D. | Blockers |
| Answer» C. Dual carriers | |
| 6. |
Forward current through a semi conductor diode circuit is due to |
| A. | Minority carriers |
| B. | Majority carriers |
| C. | Holes |
| D. | Electrons |
| Answer» C. Holes | |
| 7. |
Hole is equivalent to |
| A. | A negative charge |
| B. | A positive charge |
| C. | A neutral particle |
| D. | An electron |
| Answer» C. A neutral particle | |
| 8. |
In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is |
| A. | Equal to D.C. value |
| B. | More than D.C. value |
| C. | Less than D.C. value |
| D. | Zero |
| Answer» C. Less than D.C. value | |
| 9. |
Identify the correct statement about minority carriers |
| A. | Holes in n-type and free electrons in p-type |
| B. | Holes in n-type and p-type |
| C. | Free electrons in n-type and holes in p-type |
| D. | Free electrons in n-type and p-type |
| Answer» B. Holes in n-type and p-type | |
| 10. |
In forward bias the width of potential barrier |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | No effect |
| Answer» C. Remains same | |
| 11. |
Non-inverting amplifier circuits have |
| A. | A very high input impedance |
| B. | A very low input impedance |
| C. | A low output impedance |
| D. | None of the above |
| Answer» B. A very low input impedance | |
| 12. |
p-n junction when reversed biased acts as a |
| A. | Capacitor |
| B. | Inductor |
| C. | On switch |
| D. | Off switch |
| Answer» E. | |
| 13. |
Semi-conductor germanium and silicon are |
| A. | Pentavalent |
| B. | Trivalent |
| C. | Divalent |
| D. | Tetravalent |
| Answer» E. | |
| 14. |
Semi-conductors with donor atoms and free electrons belong to the type |
| A. | N |
| B. | P |
| C. | Mix |
| D. | Any of above |
| Answer» B. P | |
| 15. |
The alternating voltage is an example of |
| A. | A digital waveform |
| B. | An analogue waveform |
| C. | Discrete waveform |
| D. | None at all |
| Answer» C. Discrete waveform | |
| 16. |
The device or circuit used for conversion of A.C. into D.C. is called |
| A. | An amplifier. |
| B. | A rectifier |
| C. | Filtering circuit |
| D. | Converter. |
| Answer» C. Filtering circuit | |
| 17. |
The device used for conversion of D.C. to A.C. is called |
| A. | Converter |
| B. | A rectifier |
| C. | Inverter |
| D. | Oscillator |
| Answer» E. | |
| 18. |
The electronic circuits which implement the various logic operations are called |
| A. | Logic gates |
| B. | Boolean algebra |
| C. | Amplifier gain |
| D. | Logic functions |
| Answer» B. Boolean algebra | |
| 19. |
The operation of a transistor requires |
| A. | That the emitter be heated |
| B. | That the base be heated |
| C. | That the collector be heated |
| D. | None of the above |
| Answer» E. | |
| 20. |
The especially designed semiconductor diodes used as indicator lamps in electronic circuits are |
| A. | The switch |
| B. | The light emitting diode |
| C. | The photo diodes |
| D. | Solar cells. |
| Answer» C. The photo diodes | |
| 21. |
The operational amplifier is |
| A. | A high gain amplifier |
| B. | A high-power amplifier |
| C. | A high resistance amplifier |
| D. | A low resistance amplifier |
| Answer» B. A high-power amplifier | |
| 22. |
The rectangular voltage is an example of |
| A. | An analogue waveform |
| B. | Continuous wave form |
| C. | Electronic waveform |
| D. | A digital waveform |
| Answer» E. | |
| 23. |
The semiconductor diode can be used as a rectifier because _ |
| A. | It has low resistance to the current flow when forward biased & high resistance when reverse biased. |
| B. | It has low resistance to the current flow when forward biased. |
| C. | It has high resistance to the current flow when reverse biased |
| D. | Its conductivity increases with rise of temperature. |
| Answer» B. It has low resistance to the current flow when forward biased. | |
| 24. |
The simplest type of rectification known as half wave rectification is obtained by |
| A. | Using a transistor |
| B. | Suppressing the harmonics in A.C voltage |
| C. | Suppressing half wave of A.C supply by using diode |
| D. | Using a Coolidge tube |
| Answer» D. Using a Coolidge tube | |
| 25. |
The specially designed semi-conductor diodes used as fast counters in electronic circuits are |
| A. | The light emitting diodes |
| B. | Photo diodes |
| C. | Photo voltaic cell |
| D. | Solar cells. |
| Answer» C. Photo voltaic cell | |
| 26. |
In the transistor schematic symbol, the arrow |
| A. | Is located on the emitter |
| B. | Is located on the base |
| C. | Is locate on the collector |
| D. | Points form north to south |
| Answer» B. Is located on the base | |
| 27. |
In full wave rectification the output D.C. voltage across the load is obtained for |
| A. | The positive half cycle of input A.C. |
| B. | The negative half cycle of input A.C. |
| C. | The complete cycle of input A.C. |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 28. |
In n-p-n transistor, p works as |
| A. | Collector |
| B. | Emitter |
| C. | Base |
| D. | Any of above |
| Answer» D. Any of above | |
| 29. |
In half-wave rectification the output D.C. voltages is obtained across the load for |
| A. | The negative half cycle of A.C. |
| B. | The positive half cycle of A.C. |
| C. | The positive and negative half cycles |
| D. | Either positive or negative half of A.C. |
| Answer» C. The positive and negative half cycles | |
| 30. |
In p-n-p transistor the collector current is |
| A. | Equal to emitter current |
| B. | Slightly less than emitter current |
| C. | Greater than emitter current |
| D. | Any of above |
| Answer» C. Greater than emitter current | |
| 31. |
The value of resistivity for insulator is of the order of |
| A. | 105 ohm metre |
| B. | 106 ohm metre |
| C. | 107 ohm metre |
| D. | 108 ohm metre |
| Answer» E. | |
| 32. |
The symbol of n-p-n transistor is |
| A. | D |
| Answer» A. D | |
| 33. |
The velocity of an oscillating charge as it moves to and fro along a wire is always |
| A. | Constant |
| B. | Zero |
| C. | Changing |
| D. | Infinite |
| Answer» D. Infinite | |
| 34. |
The working of transistor as amplifier is similar to |
| A. | Step up transformer |
| B. | Step down transformer |
| C. | Three diodes in common |
| D. | Triode vacuum tube |
| Answer» E. | |
| 35. |
Thermions are |
| A. | Protons |
| B. | Positrons |
| C. | Electrons |
| D. | Photons |
| Answer» D. Photons | |
| 36. |
To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 37. |
Which one of following band is completely filled in case of conductors? |
| A. | Conduction band |
| B. | Fermi band |
| C. | Valence band |
| D. | Forbidden band |
| Answer» B. Fermi band | |
| 38. |
To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 39. |
Which one of the following has the greatest energy gap? |
| A. | Insulator |
| B. | Conductor |
| C. | Semi conductor |
| D. | Any of above |
| Answer» B. Conductor | |
| 40. |
Which one of the following is not a donor impurity? |
| A. | Antimony |
| B. | Phosphorus |
| C. | Aluminium |
| D. | Arsenic |
| Answer» D. Arsenic | |