PSC Assistant Professor Information Technology Model Questions and Answers

26. Centre of gravity of a right circular cone of base radius r and height h from the base is:
(A) ¾ h
(B) ¼ h
(C) 3/8 h
(D) 1/8 h
Answer: B

27. What is the maximum weight that can be lowered by a person who can exert a 500 N pull on a rope if the rope is wrapped 2 ½ turns around a horizontal spur? Coefficient of friction between spur and rope is 0.3:
(A) 4.5N
(B) 45 N
(C) 556.59 N
(D) 55659 N
Answer: D

28. What is the length of a Surveyors chain?
(A) 33 ft
(B) 66 ft
(C) 33 m
(D) 66 m
Answer: B

29. R.L of a factory floor is 100.00. Staff reading on the floor is 5.62 ft, and the staff reading when the staff is held inverted with bottom touching the tie beam of the roof truss is 10.16 ft. What is the height of the tie beam above the floor?
(A) 15.78 ft
(B) 115.78 ft
(C) 4.54 ft
(D) 104.54 ft
Answer: A

30. The horizontal distance between the vertical joints in successive courses in brick work is called:
(A) Perpends
(B) Lap
(C) Arries
(D) Closer
Answer: B

31. Knocking in a spark ignition engine Is promoted by:
(A) a short flame travel length
(B) normally at the beginning of the combustion process
(C) increased clearance volume of cylinder
(D) reduced turbulence of the fuel-air mixture during combustion
Answer: D

32. Centrifugal pumps operating in series will result in:
(A) Higher discharge
(B) Reduced power consumption
(C) Higher head
(D) Low speed operation
Answer: C

33. A good refrigerant should have:
(A) High COP and high freezing point
(B) High operating pressures and low freezing point
(C) High latent heat of vaporization and low freezing point
(D) High specific volume and high latent heat of vaporization
Answer: C

34. In sheet metal blanking, shear is provided on punches and dies so that:
(A) press load is reduced
(B) good cut edge is obtained
(C) warping of sheet is minimised
(D) cut blanks are straight
Answer: A

35. A curve generated by a fixed point on the circumference of a circle which rolls without slipping on the outer side of a fixed circle is known as:
(A) Hypocycloid
(B) Epicycloid
(C) Involute
(D) Cycloid
Answer: B

36. Direction of dynamically induced EMF can be found by:
(A) Maxwell’s cork screw rule
(B) Flemings Right Hand rule
(C) Flemings Left Hand rule
(D) Coulomb’s law
Answer: B

37. Form factor of sinusoid ally varying alternating current is:
(A) 1.414
(B) 1.11
(C) 1.21
(D) 2.11
Answer: B

38. In a Delta connected three phase supply system phase current is given by:
(A) √3 times line current
(B) line current
(C) 1/√2 times line current
(D) 1/√3 times line current
Answer: D

39. Earth wire is usually connected to ……….. part of the electric heater.
(A) Metallic body
(B) Phase point
(C) Neutral point
(D) Heating coil
Answer: A

40. Which of the following DC Motor gives highest No-load speed?
(A) Shunt motor
(B) Cumulatively compound motor
(C) Series motor
(D) Differentially compound motor
Answer: C

41. The BJT used in an oscillator circuit is biased in …………….. region.
(A) Active
(B) Cut-off
(C) Saturation
(B) None of these
Answer: A

42. The ripple factor of a capacitor filter ‘C’ connected to the output of a full-wave rectifier with input line frequency ‘ f ’ Hz and load resistance ‘RL’ is:
(A) 1 / 2√3fRLC
(B) 1 / 4√3fRLC
(C) 1 / 2πfRLC
(D) 1 / 2√2fRLC
Answer: B

43. The bandwidth of wide band frequency modulated wave as per Carson’s rule is:
(A) BT ≈ 2(D+2)W
(B) BT ≈ (2D+1)W
(C) BT ≈ 2(D+1)W
(D) None of these
where D is the deviation ratio and W is the message signal bandwidth.
Answer: C

44. For a voltage shunt negative feedback amplifier using operational amplifier, select the TRUE statement:
(A) Input impedance decreases and output impedance decreases
(B) Input impedance increases and output impedance increases
(C) Input impedance increases and output impedance decreases
(D) Input impedance decreases and output impedance increases
Answer: A

45. The type of negative feedback introduced in the Common Emitter amplifier using voltage divider bias network when the bypass capacitor is removed:
(A) Current shunt
(B) Voltage shunt
(C) Voltage series
(D) Current series
Answer: D

46. The CPU gets the address of the next instruction to be executed from the:
(A) Instruction Register
(B) Memory Address Register
(C) Program Counter
(D) Accumulator
Answer: C

47. What is the value of b at the end of execution of the following C program?

int add(int a)
 {
 static int count = 0;
 count = count + a;
 return (count);
 }
 main()
 {
 int a, b;
 for (a=0; a<=4; a++)
 b = add(a);
 }

(A) 10
(B) 12
(C) 4
(D) 6
Answer: A

48. What will be the output of the following C program segment?

int n=1;
 switch (n)
 {
 case 1: printf(“One”);
 case 2: printf(“Two”);
 case 3:
 case 4:
 case 5:
 default: printf(“Wrong Choice”);
 }

(A) One
(B) One Two Wrong Choice
(C) Two
(D) One Two
Answer: B

49. The default parameter passing mechanism of functions is:
(A) Call by value
(B) Call by reference
(C) Call by result
(D) None of the above
Answer: A

50. What is the output of this C code?

#include <stdio.h>
 int main()
 {
 do
 printf(“lnside while loop”);
 while(0);
 printf(“After while loop”);
 }

(A) Infinite loop
(B) Compilation error
(C) After while loop
(D) Inside while loop After while loop
Answer: D