MCQOPTIONS
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MCQOPTIONS
This section includes 778 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The energy band occupied by the valence electrons is called___________________? |
| A. | Energy state |
| B. | Valence band |
| C. | ve energy state |
| D. | conduction band |
| Answer» C. ve energy state | |
| 202. |
A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________? |
| A. | The extension of the wire is proportional to the force applied |
| B. | The weight of the wire is negligible |
| C. | The wire is not stretched beyond its elastic limit |
| D. | The cross sectional area of the wire remains constant |
| Answer» B. The weight of the wire is negligible | |
| 203. |
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 | |
| 204. |
In the electron microscope, electric & magnetic fields are used as_______________? |
| A. | Electromagnetic gun |
| B. | Source of electromagnetic waves |
| C. | Deflecting charged particle |
| D. | Converging source of electrons |
| Answer» E. | |
| 205. |
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 | |
| 206. |
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 | |
| 207. |
On the basis of band theory of solids the semiconductors have _____________________? |
| A. | A party filled valence band and totally empty conduction band |
| B. | A completely filled valence band a totally empty conduction band and a very wide forbidden band |
| C. | A completely filled valence band a partially filled conduction band and a narrow forbidden band |
| D. | A partly filled valence band a totally empty conduction band and a wide forbidden band |
| Answer» D. A partly filled valence band a totally empty conduction band and a wide forbidden band | |
| 208. |
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. | |
| 209. |
UV radiation can be produced by______________? |
| A. | Heating the filament |
| B. | Electron excitation in the gas |
| C. | Ionization of atoms |
| D. | All the above |
| Answer» C. Ionization of atoms | |
| 210. |
In forward bias the width of potential barrier_____________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | No effect |
| Answer» C. Remains same | |
| 211. |
Which one has the greatest energy gap ? |
| A. | Semi conductor |
| B. | Conductor |
| C. | Metals |
| D. | Non metals |
| Answer» E. | |
| 212. |
A completely filled band is called__________________? |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Core band |
| Answer» E. | |
| 213. |
The band theory of solids explains satisfactorily the nature of_________________? |
| A. | Electrical insulators alone |
| B. | Electrical conductors alone |
| C. | Electrical semi conductors alone |
| D. | All of the above |
| Answer» E. | |
| 214. |
With increase in temperature the electrical conductivity of intrinsic semi conductor___________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | First increases then decreases |
| Answer» C. Remains same | |
| 215. |
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 | |
| 216. |
Very weak magnetic fields are detected by___________________? |
| A. | Squids |
| B. | Magnetic resonance imaging (MRI) |
| C. | Magnetometer |
| D. | Oscilloscope |
| Answer» B. Magnetic resonance imaging (MRI) | |
| 217. |
Energy needed to magnetize and demagnetize is represented by _________________? |
| A. | Hysteresis curve |
| B. | Hysteresis loop area |
| C. | Hysteresis loop |
| D. | Straight line |
| Answer» C. Hysteresis loop | |
| 218. |
What is the SI unit of modulus of elasticity of substance ? |
| A. | Nm-2 |
| B. | Jm-2 |
| C. | Nm-1 |
| D. | Being a number it has no unit. |
| Answer» B. Jm-2 | |
| 219. |
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. | |
| 220. |
Which one of the following is not a donor impurity ? |
| A. | antimony |
| B. | phosphorus |
| C. | aluminium |
| D. | arsenic |
| Answer» D. arsenic | |
| 221. |
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 | |
| 222. |
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ? |
| A. | 2×108 Nm-2 |
| B. | 5×106 Nm-2 |
| C. | 0.5×10-6 Nm-2 |
| D. | 0.2×10-6Nm-2 |
| Answer» C. 0.5×10-6 Nm-2 | |
| 223. |
The velocity of laser light is___________________? |
| A. | Less than ordinary light |
| B. | More than ordinary light |
| C. | Equal to ordinary light |
| D. | Different for different colours or frequency |
| Answer» D. Different for different colours or frequency | |
| 224. |
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 | |
| 225. |
The device used for conversion of D.C. to A.C. is called______________? |
| A. | Converter |
| B. | A rectifier |
| C. | Inverter |
| D. | Oscillator |
| Answer» D. Oscillator | |
| 226. |
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 | |
| 227. |
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 | |
| 228. |
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________? |
| A. | (F1+F2) (121+122) |
| B. | (F1+F2) (122-112) |
| C. | (F1+F2) (12-11) |
| D. | (F1+F2) (12-11) |
| Answer» D. (F1+F2) (12-11) | |
| 229. |
The curie temperature is that at which ____________________? |
| A. | Semi-conductor becomes conductors |
| B. | Ferromagnetic becomes paramagnetic |
| C. | Paramagnetic becomes diamagnetic |
| D. | Metals become super conductor |
| Answer» C. Paramagnetic becomes diamagnetic | |
| 230. |
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________? |
| A. | Stiffness |
| B. | Toughness |
| C. | Extension |
| D. | Deformation |
| Answer» E. | |
| 231. |
Coercive force is the force which opposes ____________________? |
| A. | Demagnetization |
| B. | Breakage |
| C. | Extension |
| D. | Surface cracking |
| Answer» B. Breakage | |
| 232. |
The breaking of crystals along definite direction is called _____________________? |
| A. | Cleavage |
| B. | Symmetry |
| C. | Isotropy |
| D. | Homogeneity |
| Answer» B. Symmetry | |
| 233. |
A vacant or partially filled band is called _____________________? |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Empty band |
| Answer» B. Valence band | |
| 234. |
The bulk properties of materials such as their mode of fracture can be related to their____________________? |
| A. | Polymerization |
| B. | Cleavage |
| C. | Microstructure |
| D. | Dislocation |
| Answer» D. Dislocation | |
| 235. |
In simple cube one atom or molecule lies at its______________________? |
| A. | Force corners |
| B. | Nine corners |
| C. | Eight corners |
| D. | Six corners |
| Answer» D. Six corners | |
| 236. |
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. | |
| 237. |
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 | |
| 238. |
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 | |
| 239. |
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 | |
| 240. |
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 | |
| 241. |
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 | |
| 242. |
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 | |
| 243. |
Which one of the following has the greatest energy gap ? |
| A. | insulator |
| B. | conductor |
| C. | semi conductor |
| D. | any of above |
| Answer» B. conductor | |
| 244. |
Holes can exist in____________________? |
| A. | Conductors |
| B. | Insulators |
| C. | Semi conductors |
| D. | All of the above |
| Answer» D. All of the above | |
| 245. |
The net charge on n-type material is____________________? |
| A. | Positive |
| B. | Negative |
| C. | Both positive and negative |
| D. | Neutral |
| Answer» E. | |
| 246. |
Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________? |
| A. | magnetic flux |
| B. | magnetic field intensity |
| C. | magnetic induction |
| D. | self inductance |
| Answer» D. self inductance | |
| 247. |
The time period of a second pendulum is______________? |
| A. | 4 seconds |
| B. | 3 seconds |
| C. | 2 seconds |
| D. | 6 seconds |
| Answer» D. 6 seconds | |
| 248. |
Two parallel wires carrying currents in the opposite directions____________________? |
| A. | repel each other |
| B. | attract each other |
| C. | have no effect upon each other |
| D. | they cancel out their individual magnetic fields |
| Answer» B. attract each other | |
| 249. |
When K.E energy of SHM is maximum its__________________? |
| A. | P.E is zero |
| B. | Acceleration is zero |
| C. | Restoring force is zero |
| D. | All P.E acceleration and restoring force are zero |
| Answer» E. | |
| 250. |
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 | |