InterviewSolution
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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. |
In the given circuit, the potential difference between A and B is |
| Answer» Correct Answer - C | |
| 2. |
The circuit as shown in the figure is equivalent to A. AND gateB. NOT gateC. OR gateD. NAND gate |
| Answer» Correct Answer - D | |
| 3. |
Two radioactive materials `X_(1)` and `X_(2)` have decay constant `11 lambda` and `lambda` respectively. If initially they have same number of nuclei, then ratio of number of nuclei of `X_(1)` to `X_(2)` will be `(1)/(e^(2))` after a timeA. `(1)/(10 lambda)`B. `(1)/(11 lambda)`C. `(11)/(10 lambda)`D. `(1)/(9 lambda)` |
| Answer» Correct Answer - D | |
| 4. |
Which one of the following combinations of radioactive decay results in the formation of an isotope of original nucleus ?A. One alpha, four betaB. One alpha, two betaC. One alpha, one betaD. Four alpha, one beta |
| Answer» Correct Answer - B | |
| 5. |
In common emitter amplifier, the current gain is 62. The collector resistance and input resistance are `5 k Omega` an `500 Omega` respectively. If the input voltage is 0.01V, the output voltage isA. `0.62 V`B. `6.2 V`C. `62V`D. `620 V` |
| Answer» Correct Answer - B | |
| 6. |
The critical angle of a certain medium is `sin ^(-1)((3)/(5))`. The polarizing angle of the medium is :A. `sin^(-1)((4)/(5))`B. `tan^(-1)((5)/(3))`C. `tan^(-1)((3)/(4))`D. `tan^(-1)((4)/(3))` |
| Answer» Correct Answer - B | |
| 7. |
In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?A. `63%`B. `69.3%`C. `37%`D. `50%` |
| Answer» Correct Answer - A | |
| 8. |
Critical angle of glass is `theta_(1)` and that of water is `theta_(2)`. The critical angle for water and glass surface would be `(mu_(g)=3//2, mu_(w)=4//3)`A. between `theta_(1)` and `theta_(2)`B. greater than `theta_(2)`C. less than `theta_(1)`D. less than `theta_(2)` |
| Answer» Correct Answer - B | |
| 9. |
In an AC circuit, a resistance of `Rohm` is connected is series with an inductance `L`. If phase angle between volage and current be `45^(@)`, the value of inductive reactance will beA. `(R)/(4)`B. `(R)/(2)`C. RD. cannot be found with given data |
| Answer» Correct Answer - C | |
| 10. |
A particle of mass m and charfe Q is placed in an electric filed W which varies with time t as E = `E_(0) sin omegat`. It will undergo simple harmonic motion of amplitude.A. `(QE_(0)^(2))/(m omega^(2))`B. `(QE_(0))/(m omega^(2))`C. `sqrt((QE_(0))/(m omega^(2)))`D. `(QE_(0))/(m omega)` |
| Answer» Correct Answer - B | |
| 11. |
A short conducting rod P of length `3.0 cm` is placed parallel to an near the centre of a long conducting rod Q of length 3.0 m. Conductors P and carry currents of 3.0 A and 4.0 A respectively in the same direction. The two conductors are separated by a distance of `2.0 cm` in air. What is the force experienced by the long conductor Q ?A. `1.6 xx 10^(-6)N`B. `2.6 xx 10^(-6)N`C. `3.6 xx 10^(-6)N`D. `4.6 xx 10^(-6)N` |
| Answer» Correct Answer - C | |
| 12. |
Consider a uniform electric field `E = 3xx10^(3) hat(i) N//C`. (a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the yz plane ? (b) What is the flux through the same square if the normal to its plane makes a `60^(@)` angle with the x-axis ?A. `10 N C^(-1) m^(2)`B. `20 N C^(-1) m^(2)`C. `30 N C^(-1) m^(2)`D. `40 N C^(-1) m^(2)` |
| Answer» Correct Answer - C | |
| 13. |
The potential field of an electric field `vec(E)=(y hat(i)+x hat(j))` isA. V = -(x+y) + constantB. V = constantC. `V = -(x^(2)+y^(2)) + " constant"`D. V = -xy + constant |
| Answer» Correct Answer - D | |
| 14. |
An electric of `5A` is passing through a circuit contaning three arrengement in parallel if the length and radius of the wires are in the ratio `2:3:4 and 3:4:5` then the ratio of current passing through wires should beA. `3 : 6 : 10`B. `4 : 9 : 16`C. `9: 16 : 25`D. `54 : 64 : 75` |
| Answer» Correct Answer - D | |
| 15. |
Four charges are arranged at the corners of a square ABCD as shown in the figure. The force on the charge kept at the ccentre O is A. along the diagonal BDB. along the diagonal ACC. zeroD. perpendicular to side AB |
| Answer» Correct Answer - D | |
| 16. |
Electric charges `q, q, –2q` are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system isA. qlB. `sqrt(3)ql`C. zeroD. 4ql |
| Answer» Correct Answer - B | |
| 17. |
When a pentavalent imputrity is added in Ge crystal then, what type of semiconductor is obtained ?A. a p-typeB. an n-typeC. intrinsicD. none of these |
| Answer» Correct Answer - B | |
| 18. |
The circular plates A and B of a parallel plate air capacitor have a diameter of 0.1 m and are `2 xx 10^(-3) m` apart. The plates C and D of a similar capacitor have a diameter of `0.12 m` and are `3 xx 10^(-3)m` apart. Plate A is earthed. Plates B and D are connected together. Plate C is connected to the positive pole of a 120V battery whose negative is earthed. The energy stored in the system isA. `0.1224 mu J`B. `0.2224 mu J`C. `0.3224 mu J`D. `0.4224 mu J` |
| Answer» Correct Answer - A | |
| 19. |
What is the conductivity of a semiconductor (in `Omega^(-1) m^(-1)`) if electron density `= 5 xx 10^(12) cm^(-3)` and hole density `= 8 xx 10^(13) cm^(-3)`? `(mu_(e) = 2.3 V^(-1) s^(-1)m^(2), mu_(h) = 0.01 m^(2) V^(-1) s^(-1))`A. `5.634`B. `1.968`C. `3.421`D. `8.964` |
| Answer» Correct Answer - B | |
| 20. |
The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is `9:1.` The intensities of the used light sources are in ratioA. `3:1`B. `4:1`C. `9:1`D. `10 : 1` |
| Answer» Correct Answer - B | |
| 21. |
The binding energy per nucleon for `C^(12)` is `7.68 MeV` and that for `C^(13)` is 7.47 MeV. What is the energy required to remove a neutron from `C^(13)` ?A. `0.21 MeV`B. `2.52 MeV`C. `4.95 MeV`D. `2.75 MeV` |
| Answer» Correct Answer - C | |
| 22. |
In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the second slit. The ratio of the maximum intensity to the minimum intensity on the interference fringe pattern observed isA. `2:1`B. `4:1`C. `9:1`D. `8:1` |
| Answer» Correct Answer - C | |
| 23. |
When a resistance of 100`Omega` is connected in series with a galvanometer of resistance R, then its range is V. To double its range, a resistance of 1000`Omega` is connected in series. Find the value of R.A. 1100B. 1000C. 900D. 800 |
| Answer» Correct Answer - C | |
| 24. |
A galvanometer of resistance `25Omega` is connected to a battery of 2 volt along with a resistance in series. When the value of this resistance is `3000Omega`, a full scale deflection of 30 units is obtained in the galvanometer. In order to reduce this deflection to 20 units, the resistance in series will beA. `4512 Omega`B. `5413 Omega`C. `2000 Omega`D. `6000 Omega` |
| Answer» Correct Answer - A | |
| 25. |
Two capacitors A and B of capacitances `2muF` and `5 mu F` are connected to two battery as shown in figure The potential difference in volt between the plate of A is A. 2B. 5C. 11D. 18 |
| Answer» Correct Answer - B | |
| 26. |
In a reflecting astronomical telescope, if the objetcive (a spherical mirror) is replaced by a parabolic mirror of the same focal length and aperture, thenA. the final image will be erectB. a large image will be obtainedC. the telescope will gather more lightD. spherical aberration will be absent |
| Answer» Correct Answer - D | |
| 27. |
A concave lens forms the image of an object such that the distance between the object and image is focal length of the lens will beA. `-6.2 cm`B. `-4.4 cm`C. `-8.6 cm`D. `-10 cm` |
| Answer» Correct Answer - B | |
| 28. |
A potentiometer wire of length `100 cm` having a resistance of `10 Omega` is connected in series with a resistance `R` and a cell of emf `2V` of negligible internal resistance. A source of emf of `10 mV` is balanced against a length of `40 cm` of the potentiometer wire. What is the value of resistance `R` ?A. `790 Omega`B. `890 Omega`C. `990 Omega`D. `1090 Omega` |
| Answer» Correct Answer - A | |
| 29. |
A straight wire carring current I is turned into a circular loop. If the magnitude of magnetic moment associated with it in M.K.S. unit is M, the length of wire will beA. `(4piI)/(M)`B. `sqrt((4pi M)/(I))`C. `sqrt((4pi I)/(M))`D. `(M pi)/(4I)` |
| Answer» Correct Answer - B | |
| 30. |
The length of a telescope is 36 cm . The focal lengths of its lenses can beA. 30 cm, 6cmB. `-30cm, -6 cm`C. `30cm, -6cm`D. `-30cm, 6cm` |
| Answer» Correct Answer - A | |
| 31. |
A uniform wire of resistance `36 Omega` is bent in the form of a circle. The effective resistance across the points A and B is A. `5 Omega`B. `15 Omega`C. `7.2 Omega`D. `30 Omega` |
| Answer» Correct Answer - A | |
| 32. |
A wire `ABCDEF` ( with each side of length `L`) bent as shown in figure and carrying a current `I` is placed in a uniform magnetic induction `B` parallel to the positive ` y- direction `. The force experienced by the wire is ……….. In the ………. direction . A. 2 BILB. `(BIL)/(2)`C. BILD. `(BIL)/(4)` |
| Answer» Correct Answer - C | |
| 33. |
A transformer with efficiency `80%` works at `4 kW` and `100 V`. If the secondary voltage is `200 V`, then the primary and secondary currents are respectivelyA. 40A, 16 AB. 16 A, 40 AC. 20 A, 40 AD. 40 A, 20 A |
| Answer» Correct Answer - A | |
| 34. |
Current flows through uniform square frames as shown. In which case is the magnetic field at the centre of the frame not zero ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 35. |
A microammeter has as resistance of `100 Omega` and full scale range of `50 muA`. It can be used a voltmeter or as ahigher range ammeter provided a resistance is added to it. Pick the correct range and resistance combinations 50 V range with `10 kOmega` resistance in series b.`10 V` range with `200 kOmega` resistance in series c. 5mA rangw with `1Omega` resistance in parallel `10 mA` range with `1Omega` resistance in parallelA. 50 V range with `10 kOmega` resistance in seriesB. 10 V range with `200 kOmega` resistance in series.C. 5mA range with `2 Omega` resistance in parallelD. 10 mA range with `2Omega` resistance in parallel |
| Answer» Correct Answer - B | |
| 36. |
The primary and secondary coils of a transmformer have `50` and `1500` turns respectively. If the magnetic flux `phi` linked with the primary coil is given by `phi=phi_(0)+4t`, where `phi` is in weber, `t` is time in second and `phi_(0)` is a constant, the output voltage across the secondary coil isA. 90 VB. 120 VC. 220 VD. 30V |
| Answer» Correct Answer - B | |
| 37. |
A current of `3 A` flows through the `2 Omega` resistor as shown in the circuit. The power dissipated in the `5 Omega` resistor is A. 1WB. 5WC. 4WD. 2W |
| Answer» Correct Answer - B | |
| 38. |
A voltmeter having a resistance of `1800 Omega` employed to measure the potential difference across a `200 Omega` resistor which is connected to the terminals of a dc power supply having an emf of 50 V and an internal resistance of `20 Omega`. What is the percentage decrease in the potential difference across the `200 Omega` resistor as a result of connecting the voltmeter across it?A. `1%`B. `5%`C. `10%`D. `25%` |
| Answer» Correct Answer - A | |
| 39. |
Four capacitors and a battery are connected as shown in. If the potential difference aross the `7 muF` capacitor is `6 V`, then which of the following statement(s) is//are correct? A. The potential drop across the `12 mu F` capacitor is 10 V.B. The charge on the `3mu F` capacitor is `42mu C`.C. The potential drop across the `3mu F` capacitor is 10V.D. The emf of the battery is 30 V. |
| Answer» Correct Answer - C | |
| 40. |
For perfectly coupled coils, the coupling coefficient should be equal toA. oneB. zeroC. infiniteD. more than one |
| Answer» Correct Answer - A | |
| 41. |
The efficiency of a transformer is 90%. The transformer is rated for output of 9000 W. If the primary voltage is 1000 V and resistance of primary is one ohm then the copper losses in the primary coil will beA. 400 WB. 200 WC. 100 WD. 300 W |
| Answer» Correct Answer - C | |
| 42. |
The steady state current in a `2 Omega` resistor when the internal resistance of the battery is negligible and the capacitance of the condenser is `0.1 mu F` is A. `0.6 A`B. `0.9A`C. `1.5 A`D. `0.3 A` |
| Answer» Correct Answer - D | |
| 43. |
A `200 muF` capacitor in series with a `100 Omega` resistance is connected to a 240 V, 50 Hz supply. What is the maximum current in the circuit ?A. `1.4 A`B. `3.4 A`C. `4.4A`D. `2.4 A` |
| Answer» Correct Answer - B | |
| 44. |
A `100 V` a.c. source of frequency `500 Hz` is connected to a `LCR` circuit with `L = 8.1` millihenry, `C = 12.5 mu F` and `R = 10` ohm, all connected in series. What is the potential difference across the resistance?A. 25 VB. 50 VC. 75 VD. 100 V |
| Answer» Correct Answer - D | |
| 45. |
What is the energy stored in the capacitor between terminals a and b of the network shown in the figure ? (Capacitance of each capacitance `C=1muF`) A. 75JB. 100 JC. 150JD. 125 J |
| Answer» Correct Answer - A | |
| 46. |
The focal length of a biconvex lens of refractive index 1.5 is 0.06m. Radii of curvature are in the ratio 1:2. Then radii of curvature of two lens surfaces areA. `0.045 m, 0.09m`B. `0.09m, 0.18m`C. `0.04m, 0.08m`D. `0.06m, 0.12m` |
| Answer» Correct Answer - A | |
| 47. |
A beam of light of wavelength 600 nm from a distant source falls on a single slit 1.0 mm wide and the resulting diffraction pattern is observed on a screen 2m away. What is the distance between the first dark fringe on either side of the central bright fringe?A. `1.2 cm`B. `1.2 mm`C. `2.4 cm`D. `2.4 mm` |
| Answer» Correct Answer - D | |
| 48. |
A metallic surface is irradiated by a monochromatic light of frequency `v_(1)` and stopping potential is found to be `V_(1)`. If the light of frequency `v_(2)` irradiates the surface, the stopping potential will beA. `V_(1)+(h)/(e)(v_(1)+v_(2))`B. `V_(1)+(h)/(e)(v_(1)-v_(2))`C. `V_(1)+(e)/(h)(v_(2)-v_(1))`D. `V_(1)-(h)/(e)(v_(1)+v_(2))` |
| Answer» Correct Answer - B | |
| 49. |
An ac source is of `(200)/(sqrt(2))` V, 50 Hz. The value of voltage after `(1)/(600)s` from the start isA. 200 VB. `(200)/(sqrt(5))`C. 100 VD. 50 V |
| Answer» Correct Answer - D | |
| 50. |
A wire when connected to 220 V mains supply has power dissipation `P_1`. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is `P_2`. Then `P_2: P_1` isA. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - D | |