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Air-India Paper-1

Posted on July 10, 2017
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Air-India Paper-1

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Question 1 of 50

1. Question
1 points
The output of OR gate is 1 when?
- if either input is zero
- if both inputs are zero
- if either or both inputs are 1
- only if both inputs are I
Correct

Incorrect
Question 2 of 50

2. Question
1 points
Line spectrum is obtained from the?
- Sun
- Filament of the bulb
- Mercury lamp
- Burning coal
Correct

Incorrect
Question 3 of 50

3. Question
1 points
A moving charge produces:
- neither electric field nor magnetic field
- electro-static field only
- magnetic field only
- both magnetic and electro-static fields
Correct

Incorrect
Question 4 of 50

4. Question
1 points
In semiconductors at a room temperature
- the conduction band is completely empty
- the valence band is partially empty and the conduction band is partially filled
- the valence band is completely filled and the conduction band is partially filled
- the valence band is completely filled
Correct

Incorrect
Question 5 of 50

5. Question
1 points
Light year is a unit of
- time
- distance
- velocity
- acceleration
Correct

Incorrect
Question 6 of 50

6. Question
1 points
It is easier to draw up wooden block along an inclined plane than bang it up vertically principally because:
- the friction is reduced
- only a part of the weight has to be overcome
- the mass becomes smaller
- g becomes smaller
Correct

Incorrect
Question 7 of 50

7. Question
1 points
If a piece of ice floating on the surface of water in a beaker melts completely, the level of water
- rises
- remains the same
- falls
- initially rises and then falls
Correct

Incorrect
Question 8 of 50

8. Question
1 points
A Kelvin thermometer and a Fahrenheit thermometer used to record temperature of melting metal, read the same. What will a celcius thermometer read at that temperature?
- 301.25°
- 273°
- 457°
- 760°
Correct

Incorrect
Question 9 of 50

9. Question
1 points
A hydrogen-filled balloon expands as it rises and may even burst after rising very high in the atmosphere. This happens because:
- the temperature increases with height
- the temperature decreases with height
- the atmospheric pressure increases with height
- the atmospheric pressure decreases with height
Correct

Incorrect
Question 10 of 50

10. Question
1 points
if two substances of equal volumes but of different densities are dropped from the same height simultaneously, then
- the body of lower density will reach the earth earlier
- both the bodies will reach the earth simultaneously
- The body of higher density will reach earlier
- It depends upon the place
Correct

Incorrect
Question 11 of 50

11. Question
1 points
When the bob of a pendulum is at the mean position (minimum displacement) of its motion,its total energy is:
- all potential
- zero
- all kinetic
- partly kinetic partly potential
Correct

Incorrect
Question 12 of 50

12. Question
1 points
A red and a green pencil are taken in a room illuminated with green light. In the room:
- both pencils will appear dark
- pencils will appear as red and green respectively
- red pencil.will appear dark and green pencil as green
- red pencil will appear red and green pencil dark
Correct

Incorrect
Question 13 of 50

13. Question
1 points
The consumption of electrical energy in the household is measured in terms of:
- Kilowatt hour
- Kilowatts
- Joules
- Kilo Joules
Correct

Incorrect
Question 14 of 50

14. Question
1 points
A magnet is placed in earth?s magnetic field with north pole of the magnet pointing north. At the neutral point:
- the earth?s magnetic field is zero
- the magnet?s magnetic field is zero
- the fields of the magnet and the earth are equal and in the same direction
- the fields of the magnet and the earth are equal and opposite
Correct

Incorrect
Question 15 of 50

15. Question
1 points
Sudden fall of a barometer reading indicates:
- storm
- dry weather
- fine weather
- cold weather
Correct

Incorrect
Question 16 of 50

16. Question
1 points
If a ball and a rectangular block of different metal when completely immersed in a liquid,have the same loss of weight, then
- ball and rectangular block have same density
- ball and rectangular block have Weight in air
- ball and rectangular block have same volume
- ball and rectangular block have immersed to the same depth
Correct

Incorrect
Question 17 of 50

17. Question
1 points
If the period of oscillation of a simple pendulum is 4 seconds and we want to convert it into a second pendulum, then we have to:v
- make the length of the pendulum one fourth of the previous length
- double the length of the pendulum
- make the length of the pendulum half of the previous length
- double the mass of the bob
Correct

Incorrect
Question 18 of 50

18. Question
1 points
The escape velocity of a body from the earth depends upon:
- mass of the body
- radius of the earth as well as the value of g
- the radius of the earth only
- volume of the body
Correct

Incorrect
Question 19 of 50

19. Question
1 points
A cyclist taking a turn bends inside because:
- he feels pleasure in doing so
- he increases speed in doing so
- he obtains necessary Centripetal force
- he avoids accidents
Correct

Incorrect
Question 20 of 50

20. Question
1 points
If the surface of water in a lake is just going to freeze, then the temperature of water at the bottom is
- 0°C
- 4°C
- 3°C
- none of these
Correct

Incorrect
Question 21 of 50

21. Question
1 points
The tangent law is applicable only when:
- there are at least two magnetic fields
- there two uniform magnetic fields mutually perpendicular to each other
- one strong magnetic field and the other weak magnetic field
- in the present magnetic fields one should be horizontal component of the earth?s magnetic field
Correct

Incorrect
Question 22 of 50

22. Question
1 points
A moving coil galvanometer is converted into an ammeter by putting:
- a high resistance in parallel
- a low resistance in series
- a low resistance in parallel
- a high resistance in series
Correct

Incorrect
Question 23 of 50

23. Question
1 points
Lenz?s law is derived from the law of conservation of:
- momentum
- energy
- charge
- magnetism
Correct

Incorrect
Question 24 of 50

24. Question
1 points
On which one of the factors does the sensivity of a galvanometer depend?
- number of the turns of the coil
- the temperature of the room
- the current flowing in it
- the potential difference between the two ends.
Correct

Incorrect
Question 25 of 50

25. Question
1 points
A depletion layer consists of?
- electrons
- protons
- mobile ions
- immobile ions
Correct

Incorrect
Question 26 of 50

26. Question
1 points
The transfer ratio beta of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1 kOhm. The peak value of the co current for an A.C. input voltage of 0.01 V peak is ?
- 100 microA
- 0.01 mA
- 0.25 mA
- 500 microA
Correct

Incorrect
Question 27 of 50

27. Question
1 points
The cause of the potential barrier in a p-n diode is ?
- Depletion of positive charges near the junction
- Concentration of positive charges near the junction
- Depletion of negative charges near the junction
- Concentration of positive and negative charges near the junction
Correct

Incorrect
Question 28 of 50

28. Question
1 points
In forward bias, the width of potential barrier in a p-n junction diode?
- increases
- decreases
- remains constant
- first increases then decreases
Correct

Incorrect
Question 29 of 50

29. Question
1 points
A depletion layer consists of?
- electrons
- protons
- mobile ions
- immobile ions
Correct

Incorrect
Question 30 of 50

30. Question
1 points
Which of the following when added acts as an impurity into silicon produced n-type semi conductor?
- P
- Al
- B
- Mg
Correct

Incorrect
Question 31 of 50

31. Question
1 points
In a junction diode, the holes are due to
- protons
- extra electrons
- neutrons
- missing electrons
Correct

Incorrect
Question 32 of 50

32. Question
1 points
The intrinsic semiconductor becomes an insulator at
- 0°C
- 0K
- 300K
- ?100°C
Correct

Incorrect
Question 33 of 50

33. Question
1 points
For a common emitter circuit if IC/IE = 0.98 then current gain for common emitter circuit will be
- 49
- 98
- 4.9
- 25.5
Correct

Incorrect
Question 34 of 50

34. Question
1 points
In a p-n junction
- The potential of the p and n sides becomes higher alternately
- The p side is at higher electrical potential than the n side
- The n side is at higher electrical potential than the p side
- Both the p and n sides are at the same potential
Correct

Incorrect
Question 35 of 50

35. Question
1 points
In the case of a common emitter transistor amplifier the ratio of the collector current to the emitter current Ic/Ie is 0.96. The current gain of the amplifier is ?
- 6
- 48
- 24
- 12
Correct

Incorrect
Question 36 of 50

36. Question
1 points
if a full wave rectifier circuit is operating from 5oHz mains, the fundamental frequency in the tipple will be
- 100Hz
- 25Hz
- 50Hz
- 70.7 Hz
Correct

Incorrect
Question 37 of 50

37. Question
1 points
A n-p-n transistor conducts when ?
- both collector and emitter are negative with respect to, the base
- both collector and emitter are positive with respect to the base
- collector is positive and emitter is negative with to the base
- collector is positive and emitter is at same potential as the base
Correct

Incorrect
Question 38 of 50

38. Question
1 points
Barrier potential of a p-n junction diode does not depend on?
- doping density
- diode design
- temperature
- forward bias
Correct

Incorrect
Question 39 of 50

39. Question
1 points
Reverse bias applied to a junction diode
- increases the minority carrier current
- lowers the potential barrier
- raises the potential barrier
- increases the majority carrier current
Correct

Incorrect
Question 40 of 50

40. Question
1 points
In semiconductors at a room temperature
- the conduction band is completely empty
- the valence band is partially empty and the conduction band is partially filled
- the valence band is completely filled and the conduction band is partially filled
- the valence band is completely filled
Correct

Incorrect
Question 41 of 50

41. Question
1 points
The output of OR gate is 1 when?
- if either input is zero
- if both inputs are zero
- if either or both inputs are 1
- only if both inputs are I
Correct

Incorrect
Question 42 of 50

42. Question
1 points
In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to ?
- the voltage applied at the p-n junction
- the barrier voltage at the p-n junction
- the intensity of the light falling on the cell
- the frequency of the light falling on the cell
Correct

Incorrect
Question 43 of 50

43. Question
1 points
Choose the only false statement from the following.
- in conductors the valence and conduction bands may overlap.
- Substances with energy gap of the order of 10 eV are insulators.
- The resistivity of a semiconductor increases with increase in temperature.
- The conductivity of a semiconductor increases with increase in temperature.
Correct

Incorrect
Question 44 of 50

44. Question
1 points
Carbon, Silicon and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)Si and (Eg)Ge respectively. Which one of the following relationship is true in their case?
- (Eg)C> (Eg)Si
- (Eg)C< (Eg)Si
- (Eg)C=(Eg)Si
- (Eg)C< (Eg)Ge
Correct

Incorrect
Question 45 of 50

45. Question
1 points
Application of a forward bias to a p?n junction
- widens the depletion zone.
- increases the potential difference across the depletion zone.
- increases the number of donors on the n side.
- increases the electric field in the depletion zone.
Correct

Incorrect
Question 46 of 50

46. Question
1 points
Zener diode is used for?
- Amplification
- Rectification
- Stabilisation
- Producing oscillations in an oscillator
Correct

Incorrect
Question 47 of 50

47. Question
1 points
A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes ?
- inclined at 45° to the magnetic field
- inclined at any arbitrary angle to the magnetic field
- parallel to the magnetic field
- perpendicular to magnetic field
Correct

Incorrect
Question 48 of 50

48. Question
1 points
Tesla is the unit of
- magnetic flux
- magnetic field
- magnetic induction
- magnetic moment
Correct

Incorrect
Question 49 of 50

49. Question
1 points
Energy in a current carrying coil is stored in the form of ?
- electric field
- magnetic field
- dielectric strength
- heat
Correct

Incorrect
Question 50 of 50

50. Question
1 points
Besides his parents, he _________also present at the function.
- is
- was
- has
- has been
Correct

Incorrect

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