InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The question has statement - 1 and statement - 2 Of the four choices given after the statements , choose the one that best describes the two statements statement - 1 : Sky wave signals are used for long distance radio communication . These signals are in generel , less stable then ground wave signals statement - 2 : The state of inosphere varies from to hour day and season to season .A. Statement-1 is true, Statement-2 is falseB. Statement-1 is true, Statement-2 is true and Statement -2 is the correct explanation of Statement-1C. Statement-1 is true , Statement -2 is true and Statement-2 is not the correct explanation of Statement-1D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - B | |
| 2. |
If the lattice constant of this semiconductor is decreased, then which of the following is correct ? .A. `E_(c)` and `E_(v)` decrease, but `E_(g)` increasesB. All `E_(c) , E_(g) E_(v)` decreaseC. All `E_(c), E_(g) , E_(v)` increaseD. `E_(c)` and `E_(v)` increase, but `E_(g)` decreases |
| Answer» Correct Answer - D | |
| 3. |
The main cause of avalence breakdown isA. collision ionisationB. high dopingC. recombination of electron and holesD. none of these |
| Answer» Correct Answer - A | |
| 4. |
A cube of germanium is placed between the poles of a magnet and a voltage is applied across opposite faces of the cube as shown in Figure. Magnetic field is directed vertical downward in the plane of the paper : What effect will occur at the surface of the cube ? A. The top surface of cube will become negative chargedB. The front surface of the cube will become positively chargedC. The front surface of the cube will become negative chargedD. Both top and front surface of cube will become positively charged |
| Answer» Correct Answer - B | |
| 5. |
Statement -1: When lightning strikes a metal pipe, the pipe tends to contact. Statement-2: Parallel current attract each other.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
| Answer» Correct Answer - A | |
| 6. |
A hollow copper sphere & a hollow copper cube of same surface area & negligible thickness , are filled with warm water of same temperature and placed in an enclosure of constant temperature a few degrees below that of the bodies. Then in the beginning:-A. the rate of energy lost by the sphere is greater than that by the cubeB. the rate of energy lost by the two are equalC. the rate of energy lost by the sphere is less than that by the cubeD. the rate of fall of temperature for sphere is less than that for the cube. |
| Answer» Correct Answer - B::D | |
| 7. |
A gas is filled in an organ pipe and it is sounded in fundamental mode. Choose the correct statement(s) (T=constant)A. If gas is changed from `H_(2) to O_(2)`, the resonant frequency will increaseB. If gas is changed from `O_(2) to N_(2)`, the resonant frequency will increaseC. if gas is changed from `N_(2) to He`, the resonant frequency will decreaseD. If gas is changed from `He to CH_(4)`,the resonant frequency will decrease |
| Answer» Correct Answer - B::D | |
| 8. |
There is a cubical cavity inside a conducting sphere of radius R. A positive point charge Q is placed at the centre of the cube and another positive charge q is placed at a distance `1(gtR)` from the centre of the sphere. The sphere is earthed Net charge on the outer surface of conducting sphere isA. zeroB. positiveC. negativeD. can not be determined. |
| Answer» Correct Answer - B | |
| 9. |
In the given circuit `V_(O_(1))&V_(O_(2))` areA. `11.3` V & `0.3` VB. `0.3` V & `11.3` VC. `11.3` V & `11.3` VD. `0.3` V & `0.3` V |
| Answer» Correct Answer - A | |
| 10. |
Which is the correct diagram of a half- wave reactifier?A. B. C. D. |
| Answer» Correct Answer - B | |
| 11. |
In the diagram, the input is across the terminals `A` and `C` and the output is across the terminals `B` and `D`, then the outputs is A. zeroB. same as inputC. full wave rectifierD. half wave rectifier |
| Answer» Correct Answer - C | |
| 12. |
Statement 1: Conductivity of semiconductor increases with increase in temperature. Statement 2: Forbidden energy gap is highest for semiconductors.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement-2 is not the correct explanation of Statement -1.C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - C | |
| 13. |
If a `p-n` junction diode, a square input signal of `10 V` is applied as shown. Then the out put signal across `R_(L)` will be .A. B. C. D. |
| Answer» Correct Answer - D | |
| 14. |
When `p-n` junction diode is forward biased thenA. both the deplection region and barrier height are reducedB. the depletion region is widened and barrier is reducedC. the deplection region is reduced and barrier height is increasedD. both the depletion region and barrier height are increased |
| Answer» Correct Answer - A | |
| 15. |
The figure shows P - V diagram of a thermodynamic cycle Choose the correct V - T diagram for the given cyclic process.A. B. C. D. none of these |
| Answer» Correct Answer - B | |
| 16. |
The figure shows P - V diagram of a thermodynamic cycle Identify the diagram which correctly represents the heat inflow and outflow of the systemA. B. C. D. |
| Answer» Correct Answer - B | |
| 17. |
The figure shows P - V diagram of a thermodynamic cycle Choose the correct V - T diagram for the given cyclic process.A. B. C. D. none of these |
| Answer» Correct Answer - A | |
| 18. |
Two block` M_(1)` and `M_(2)` rest upon each other on an inclined plane Coefficient of friction between surfaces are shown if the angle 0 is slowly increased and `M_(1) le M_(2)` then A. block A slips firstB. block B slips firstC. both slip simultaneouslyD. both remain at rest |
| Answer» Correct Answer - B | |
| 19. |
A U-tube filled with a liquid of volumetric expansion coefficient `10^(-5)//^(@)C` lies in a vertical plane. The height of liquid column in the left vertical limb is 100 cm. The liquid in the left vertical limb is maintained at a temperature `=^(@)`C while the liquid in the right limb is maintained at a temperature `=100^(@)` C The difference in levels in the two limbs isA. `0.1` cmB. `0.2` cmC. `0.2` cmD. zero |
| Answer» Correct Answer - A | |
| 20. |
If the accelerating voltage across an x-ray tube is doubledA. The wavelength of characteristic lines are halved.B. The minimum wavelength of x-rays is halvedC. The x-rays are probably becomes more penetratingD. The target metal will get heat up earlier. |
| Answer» Correct Answer - B::C::D | |
| 21. |
The figure shows positions of object O and its diminished image I. This is possible If: A. a convex mirror is placed to the right of IB. a convex mirror is placed between O and IC. a convex lens is placed to the right of ID. a convex lens is placed between O and I |
| Answer» Correct Answer - B::C | |
| 22. |
Statement-1: Colour of a glowing black body changes on increasing its temperature. Statement-2: Spectral emissive power associated with each wavelength does not increase in same proportion on increasing temperature of the Black Body.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
| Answer» Correct Answer - A | |
| 23. |
A vertical electric dipole antennaA. radiates uniformly in all directionB. radiates uniformly in all horizontal directions but more strongly in the vertical direction.C. does not radiate in the horizontal directions.D. |
| Answer» Correct Answer - C | |
| 24. |
For a carrier frequency of 100 kHz and a modulating frequency of 5kHz what is the width of AM transmission-A. 5 kHzB. 10 kHzC. 20 kHzD. 200 KHz |
| Answer» Correct Answer - B | |
| 25. |
Current in the circuit will be A. 5/40 AB. 1/10 AC. 5/10 AD. 5/20 A |
| Answer» Correct Answer - B | |
| 26. |
In the given figure, which of the diodes are forward biased? A. 1,2,3B. 2,4,5C. 1,3,4D. 2,3,4 |
| Answer» Correct Answer - B | |
| 27. |
The rms value of the electric field of the light from the sun is `720 N//C` The total energy density of the electromagnetic wave isA. `4.58xx10^(-6) J//m^(3)`B. `6.37xx10^(-9)J//m^(3)`C. `81.35xx10^(-12)J//m^(3)`D. `3.3xx10^(-3)J//m^(3)` |
| Answer» Correct Answer - A | |
| 28. |
In the following circuits `PN`-junction diodes `D_(1), D_(2)` and `D_(3)` are ideal for the following potential of `A` and `B`, the correct increasing order to resistance between `A` and `B` will be `(i) -10V, -5V (ii) -5V,-10V` `(iii) -4V, -12V`A. (1)lt(2)lt(3)B. (3)lt(2)lt(1)C. (2)=(3)lt(1)D. (1)=(3)lt(2) |
| Answer» Correct Answer - C | |
| 29. |
In the figure an A.C of rms voltage 200 volt is appled to the circuit containing diode and the capacitor and it is being rectified. The maximum potential across the capacitor C in volt will beA. 500 VB. 200 VC. 283 VD. 141 V |
| Answer» Correct Answer - C | |
| 30. |
A sinusoidal voltage of peak value `200` volts is connected to a diode and resistor `R` in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to `R` the `rms` voltage (in volt) across `R` is approximately A. 200B. 100C. `200/sqrt(2)`D. 280 |
| Answer» Correct Answer - B | |
| 31. |
For the given combination of gates, if the logic states of inputs `A,B,C,` are as follows `A=B=C=0` and `A=B=1, C=0` then the logic states of output `D` are A. 0,0B. 0,1C. 1,0D. 1,1 |
| Answer» Correct Answer - D | |
| 32. |
Which logic gate is represented by the following combination of logic gates A. ORB. NANDC. ANDD. NOR |
| Answer» Correct Answer - C | |
| 33. |
Which of the following gates will have an output of 1A. B. C. D. |
| Answer» Correct Answer - C | |
| 34. |
The combination of gates shown below yields .A. XOR gateB. NAND gateC. OR gateD. NOT gate |
| Answer» Correct Answer - C | |
| 35. |
There is a cubical cavity inside a conducting sphere of radius R. A positive point charge Q is placed at the centre of the cube and another positive charge q is placed at a distance `1(gtR)` from the centre of the sphere. The sphere is earthed Net charge on the outer surface of conducting sphere isA. `-Q`, uniformly distributedB. `-Q`, non-uniformly distributedC. `-(Q+q)` non-uniformly distributedD. none |
| Answer» Correct Answer - B | |
| 36. |
An `NPN`-transistor circuit is arranged as shown in figure. It is A. a common-base amplifier circuitB. a common-emitter amplifier circuitC. a common-collector amplifier circuitD. none of the above |
| Answer» Correct Answer - B | |
| 37. |
A potential difference of `2V` is applied between the opposite faces of a `Ge` crystal plate of area `1 cm^(2)` and thickness `0.5 mm`. If the concentration of electrons in `Ge` is `2xx10^(19)//m^(3)` and mobilities of electrons and holes are `0.36(m^(2))/(vol t-sec)` and `0.14 (m^(2))/(vol t-sec)` respectively, then the current flowing through the plate will beA. `0.25` AB. `0.45` AC. `0.56` AD. `0.64` A |
| Answer» Correct Answer - D | |
| 38. |
Statement 1: Doping concentration is maximum in emitter in transistor. Statement 2: Maximum number of electrons flows from emitter to base in n-p-n transistor.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement-2 is not the correct explanation of Statement-1.C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - B | |
| 39. |
In semiconductor the concentrations of electron and holes are `8xx10^(18)//m^(3)` and `5xx10^(18)//m` respectively. If the mobilities of electrons and hole are `2.3 m^(2)//`volt-sec and `0.01m^(2)//` volt-sec respectively, then semicondutor isA. N - type and its resistivity is `0.34` ohm-metreB. P - type and its resistivity is `0.034` ohm-metreC. N - type and its resistivity is `0.034` ohm-metreD. P - type and its resistivity is `3.40` ohm-metre |
| Answer» Correct Answer - A | |
| 40. |
If the ratio of the concentration of electron to that of holes in a semiconductor is `(7)/(5)` and the ratio of current is `(7)/(4)` then what is the ratio of their drift velocities ?A. `5/4`B. `4/7`C. `5/8`D. `4/5` |
| Answer» Correct Answer - A | |
| 41. |
Statement 1: In semiconductors current is obtained due to motion of electrons and holes. Statement-2: Breaking up of covalent bond produces holes in valance band and electrons in conduction band.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement-2 is not the correct explanation of Statement-1.C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - A | |
| 42. |
A Both Valance band and conduction band can accommodate equal number of electrons. B. Conduction band has less energy then Valance band.A. A is true, B is wrongB. B is true, A is wrongC. Both are trueD. None is true |
| Answer» Correct Answer - A | |
| 43. |
Statement 1: Conductivity of semiconductors decreases with increase in temperature Statement-2: More electron goes from valance band to conduction band with increase in temperature.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement-2 is not the correct explanation of Statement-1.C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - D | |
| 44. |
A dipole radio transmitter has its rod-shaped antenna oriented vertically. At a point due south of the transmitter, the radio waves have their magnetic field.A. oriented north-southB. oriented east-westC. oriented verticallyD. oriented in any horizontal direction |
| Answer» Correct Answer - B | |
| 45. |
Although choice of standard quantity is arbitrary, however several criteria must be met if a standard is to be useful as possible. Choose the correct criteria.A. Measurements made at diefferent times using the same standard can be meaningfully compared only if standard does not vary with time.B. Measurement made at different places can be compared if standard is reproducible.C. The standard should be safe from all possible causes of damageD. The standard should be readily accessible to every one who needs to use it. |
| Answer» Correct Answer - A::B::C::D | |
| 46. |
Consider standing wave formed due to superposition of two plane waves having the same amplitude, frequency and moving in opposite direction. Mark the correct statements:A. the energy of a standing wave transforms completely into potential energy and at some other instant into kinetic energy during a part of complete cycle.B. kinetic energy and potential energy attain their maximum and minimum values simultaneouslyC. there is transition of energy from each node to its adjacent antinodes and back.D. the time averaged energy flux in any cross section of the wave is zero. |
| Answer» Correct Answer - A::C::D | |
| 47. |
Which of the following is/are the limitations of amplitude modulation?A. Clear receptionB. High efficiencyC. Small operating rangeD. Good audio quality |
| Answer» Correct Answer - C | |
| 48. |
if the maximum and minimum voltage of AM wave are `V_(max)` and `V_(min)`, respectively then modulation factorA. `m=(V_(max))/(V_(max)+V_(min))`B. `m=V_(min)/(V_(max)+V_(min))`C. `m=(V_(max)+V_(min))/(V_(max)-V_(min))`D. `m=(V_(max)-V_(min))/(V_(max)+V_(min))` |
| Answer» Correct Answer - D | |
| 49. |
Statement 1: In ground wave transmission the radio signals die out after travelling some distance. Statement-2: Radio signals have a very short wavelength and hence are scattered away by the dust particles and molecules of gases in the atmosphere.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - A | |
| 50. |
Statement 1: Ground wave communication is effective only at low frequencies in the range 500 kHz to about 1500 kHz Statement 2: The decrease in the intensity of the signal due to absorption by the earth and its atmosphere is higher for higher frequencies.A. Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.B. Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1C. Statement-1 is true but Statement-2 is false.D. Statement-1 is false but Statement-2 is true. |
| Answer» Correct Answer - A | |