Electrical Impedance Resistance Conductance Sample Questions

Electrical Impedance Resistance Conductance Sample Questions
Current and resistance MCQ Quiz

1. A cycle of ac wave can be represented by
(a) ח radians
(b) 2 ח radians
(c) 90^
(d) None of these
Ans : b
2. The relationship between the frequency of ac wave and the periodic time is given by
(a) f = T
(b) f = 1/T
(c) f = 1/T2
(d) f = 1/T2
(e) Ans : b
3. DC power is given by
(a) VI cosф
(b) VI sinф
(c) VI
(d) IR
Ans : C
4 Capacitive reactance of the purely capacitive circuit is
(a) Xc= ωC
(b) Xc=1/ωC
(c) Xc=ω/C
(d) Xc=ω/C
Ans : b
5. A capacitive circuit of 50µF and of negligible resistance is connected across a 300 V.
50 Hz, single phase supply. The rms value of current drawn by the circuit is
(a) 4.72A
(b) 6A
(c) 16.68A
(d) 59.44A
Ans : a
6. The average power drawn by an inductive circuit given by
(a) P= ½ Emax Lmax
(b) P= Emax Lmax COS Ø
(c) P = ½ Emax Lmax COS Ø
(d) P = ½ E I COS Ø
Ans : c
7.The instantaneous value of current in ac circuit is represented by 150 sin (2п30t ) the amplitude and frequency of the ac wave is respectively equal to,
(a) 150 √2; 30
(b) 150; 60
(c) 150; 30
(d) 150√2; 60
Ans : c
8. Kirchhoff’s second law can be algebraically represented as
(a) ΣLR +ΣE ΣLR
(b) LR+E=0
(c) ΣLR=0
(d) ΣL=0
Ans : a

9. If the maximum current of half wave rectified wave is IMAX, then its rms value is
Given by
(a) 1.5Imax
(b) Imax /ח
(c) 0.707Imax
(d) 1.637 Imax
Ans : a
10. A sinusoidal voltage wave shape represented by 250 sin (2 ח X 50 t) .Find the
maximum value
(a) 250/2
(b) 50
(c) 250
(d) 250/ ח
Ans : c
11. The instantaneous value of current in ac circuit is represented by 100 sin (2п30t ).
RMS value of current is
(a) 77A
(b) 70.7A
(c) 707A
(d) 1A
Ans : b
12. The rms value of voltage for ac sine wave terms of its maximum value, Emax is
(a) EMax /ח
(b) 0.637Emax
(c) 0.707Emax
(d) 0.5Emax
Ans : c
13. A series ac circuit consisting of a resistor of 10 ohm and inductance of 0.2 Henry is connected across a single phase, 230 V, 50 Hz supply. The impedance of the circuit is
(a) 10.2 ohm
(b) 63.65 ohm
(c) 32.98 ohm
(d) None
Ans : b

14. Power in a pure inductive circuit is
(a) VI cosф watts
(b) VI sinф watts
(c) 1 watts
(d) 0 watts
Ans : d
15 Power in a pure capacitive circuit is
(a) VI cosф watts
(b) VI sinф watts
(c) 1 watts
(d) 0 watts
Ans : d
16. If the maximum value of current of sine Imax, its average value is
given by,
(a)0.707 Imax
(b) 0.637 Imax
(c)Imax / ח
(d)0
Ans : a
17. Resistance of 8 ohm is connected with an inductance of L Henry. The current flowing in the circuit 15 A, when 230 V 50 Hz is applied across it. The value of inductance is
(a) 0.0208 H
(b) 0.123 H
(c) 0.0416 H
(d) 0.416 H
Ans : c
18. An alternating voltage, V= Vmax sinωt is applied to a purely capacitive circuit of C
Farads. The charging current in the circuit the circuit is given by
(a) I= cV
(b) I= C dV/dt
(c) I= C dI/dt
(d)I =Emax/ωc
Ans : b
19. Capacitive reactance of the above circuit is expressed as,
(a) Xc= ωc
(b) Xc = 1/ ωc
(c) Xc = ω/c
(d) Xc = c/ω
Ans : b
20. A resistor and inductor are connected in series across a voltage of V volts. The voltage across the resistor and inductor are 100V and 190 V respectively. The magnitude of applied voltage V will be,
(a) 214.71 V
(b) 190 V
(c) 100 V
(d) None of the above
Ans : a
21. A resistance of 5 ohm is connected in series with a capacitance of 795.4 µF. the
circuit is connected across a supply of 230 V, 50 Hz. The power factor of this
circuit is,
(a) 0.78 lagging
(b) 0.67 lagging
(c) 0.78 lagging
(d) 0.82 lagging
Ans : c
22. The resistance of the coil A and B are 4 ohm and 1.75 ohm, respectively. Their
reactance’s are 3 ohm and 1.785 ohm respectively. These two coils are connected in
series across a supply of 230 V, 50 Hz. The current in the circuit will be
(a) 52.68 A
(b) 30.75 A
(c) 65.88 A
(d) 45.92 A
Ans : b
23. The capacitive reactance of an ac circuit is 5 ohm. The capacitance of the circuit will
be,
(a) 318.31 µF
(b) 0.2 µF
(c) 1273. 24 µF
(d) 636.62 µF
Ans : d
24. In a series RC circuit, the voltage drop across the resistance and capacitive reactance
are respectively, 150 V and 120 V. the power factor of this circuit will be,
(a) 0.8 leading
(b) 0.8 lagging
(c) 0.781 leading
(d) 0.781 lagging
Ans :c
25. An ac circuit consisting of an inductance of 50 mH is connected across a 230 V 60
Hz supply. The RMS value of current flowing through the circuit is
(a) 4.6 A
(b) 12.2 A
(c) 24.4 A
(d) None of these
Ans : b
26. The capacitive reactance of a circuit is 5 ohm, when the voltage applied and its frequency is 200 V and 50 Hz respectively. If the frequency of the applied voltage is reduced to 30Hz, the capacitive reactance of the circuit will be,
(a) 5 ohm
(b) 8. 33 ohm
(c) 8. Ohm
(d) 3 ohm
Ans : b
27. A purely capacitive circuit connected to a 230 V, 50 Hz supply draws 10 A. If the
capacitance of the circuit and the frequency of the applied voltage are both reduced to
half, the current drawn will be
(a) 10 A
(b) 5 A
(c) 40
(d) 2.5 A
Ans : d
28. A resistance of 15 ohm, an inductance of 0.05 H and capacitance of 90µF are
connected in series. The impedance of the circuit, when connected across supply of
230 V, 50Hz is
(a) 24. 73 ohm
(b) 19. 92 ohm
(c) 22. 73 ohm
(d) 29. 54 ohm
Ans : a
29. A current of 5 A leading its applied voltage by 90° is flowing in an ac circuit on the
application of single phase, 230 V 50 Hz supply. The parameters of the circuit are
(a) 69. 2 µF
(b) 46. ohm
(c) 69.2 mH
(d) None of these
Ans : a
30. Unit of magnetic field strength is equal to
(a) Am
(b) m/A
(c) A/m
(d) 1/Am
Ans : c
31. Which is the correct expression?
(a) B= φ.A
(b) φ= B.A
(c) B=A/ φ
(d) φ= B/A
Ans : b
32. Resistance of electrical circuit can be expressed as
(a) ) ρA/L
(b) ρL/A
(c) ρ/AL
(d) L/ρA
Ans : b
33. Reluctance of magnetic circuit can be expressed as
(a) )µL/A
(b) L/µA
(c) µA/L
(d) A/µL
Ans : b
34. Which concept is correct in magnetic circuit?
(a) ) flux flows in circuit
(b) Energy is needed till flux flow
(c) Reluctance independent of flux
(d) Flux flow due to MMF
Ans : d
35. Relation between total flux, useful flux and leakage flux is
(a) ) φT = φI- φ
(b ) φT = φ- φI
(c ) φT = φ+ φI
(d) φT = φI.φ
Ans : c
36. Leakage factor is expressed as
(a) φI= φ
(b ) φT= φI
(c ) φT= φ
(d) φ/φT
Ans : c
37. Imaginary lines around the magnet is called as
(a) Reluctance
(b) Flux
(c) Resistance
(d) Current
Ans : b


38. Expression for dynamically induced emf is given as
(a) BIv cos θ
(b) BIv sin θ
(c) BIv
(d) BIvθ
Ans : b
39. Change in linkage when conductor is stationary is called as _________ induced emf.
(a) Mutual
(b) Self
(c) Dynamically
(d) Statically
Ans : d

40. Induced emf by the movement of the conductor in magnetic filed is called induced emf.
(a) Mutually
(b) Self
(c) Dynamically
(d) Statically
Ans : c

Solved electrical engineering for IES

 Solved electrical engineering for IES
SAMPLE PAPER
1. A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its
plane becomes    ?
(a) inclined at 45° to the magnetic field
(b) inclined at any arbitrary angle to the
magnetic field
(c)   parallel to the magnetic field
(d)   perpendicular to magnetic field
Ans:c
2. Tesla is the unit of
(a)    magnetic flux
(b)    magnetic field
(c)    magnetic induction
(d)    magnetic moment
Ans:b
3. Energy in a current carrying coil is stored in the
form of   ?
(a) electric field
(b) magnetic field
(c) dielectric strength
(d) heat
Ans:b
4. The total charge induced in a conducting loop when it is moved in magnetic field depends on?
(a) the rate of change of magnetic flux
(b) initial magnetic flux only
(c) the total change in magnetic flux
(d) final magnetic flux only.
Ans:c
5. The magnetic induction at a point P which is at the distance of 4 cm from a long current carrying wire is 10^-3 T. The field of induction at a distance 12 cm from the current will be ?
(a) 3.33 x 10^-4 T
(b) 1.11x 10^-4 T
(c) 3×10^-3 T
(d) 9×10^-3 T
Ans:a
6. A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in negative X-direction. As a result, the charge will
(a) remain unaffected
(b) start moving in a circular path in Y—Z plane
(c) retard along X-axis
(d) moving along a helical path around X-axis
Ans:a
7. A uniform magnetic field acts right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2cm. If the speed of electrons is doubled, then the radius of the circular path will be ?
(a)2.0 cm
(b) 0.5 cm
(c)4.0cm
(d) 1.0cm
Ans:c
8. A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 metre in the same plane with
the same B is
(a)25 keV
(b) 50 keV
(c)200 keV
(d) 100 keV
Ans:d
9. A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in uniform magnetic field of induction 2 Tesla. The magnetic field is perpendicular to the length of the wire. The force on the wire is ?
(a) 2.4N
(b) 1.2N
(c) 3.0 N
(d) 2.0 N
Ans:b
10. To convert a galvanometer into an ammeter, one needs to connect a ?
(a) low resistance in parallel
(b) high resistance in parallel
(c) low resistance in series
(d) high resistance in series.
Ans:a
11. A coil carrying electric current is placed in uniform magnetic field
(a) torque is formed
(B) e.m.f is induced
(c) both (a) and (b) are correct
(d) none of the above
Ans:a
12. The magnetic field at a distance ‘r’ from a long wire carrying current ‘i’ is 0.4 Tesla. The magnetic field at a distance ‘2r’ is ?
(a)0.2Tesla
(b) 0.8 Tesla
(c)0.1 Tesla
(d) 1.6 Tesla
Ans:a
13. A electron enters a region where magnetic (B) and electric (E) fields are mutually
perpendicular, then ?
(a) it will always move in the direction of B
(b) it will always move in the direction of E
(c) it always possesses circular motion
(d) it can go un deflected also.
Ans:d
14. A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of I mm diameter carrying same current. The strength of magnetic field far away is?
(a) twice the earlier value
(b) same as the earlier value
(c) one-half of the earlier value
(d) one-quarter of the earlier value
Ans:b
15. At what distance from a long straight wire carrying a current of 12 A will the magnetic field
be equal to 3×10^-6 Wb/metre Square
(a) 8×10^-2 m
(b) 12×10^-2 m
(c)18x 10^-2 m
(d) 24×10^-2 m
Ans:a
16. An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to ?
(a) √(B/v)
(b) B/v
(c) √(v/B)
(d)v/B
Ans:d
17. A 10 eV electron is circulating in a plane at right angles to a uniform field at magnetic induction 10^-4 Wb/m² (= 1.0 gauss). The orbital radius of the electron is ?
(a) 12cm
(b) 16cm
(c) 11cm
(d) 18cm
Ans:c
18. A galvanometer acting as a voltmeter will have?
(a) a low resistance in series with its coil.
(b) a high resistance in parallel with its coil
(c) a high resistance in series with its coil
(d) a low resistance in parallel with its coil
Ans:c
19. A beam of electrons is moving with constant velocity in a region having simultaneous perpendicular electric and magnetic fields of strength 20 Vm^-1 and 0.5 T respectively at right angles to the direction of motion of the electrons. Then the velocity of electrons must be?
(a) 8m/s
(b) 20 m/s
(c) 40m/s
(d) 1/40 m/s
Ans:c
20. A galvanometer of resistance 20 Ohms gives full scale deflection with a current of 0.004 A. To convert it into an ammeter of range 1 A, the required shunt resistance should be?
(a) 0.38 Ohms
(b) 0.21 Ohms
(c) 0.08 Ohms
(d) 0.05 Ohms
Ans:c
21. A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is ?
(a) 4B
(b) B/2
(c) B
(d) 2B
Ans:c
22. A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
(a) continue to move due east
(b) move in a circular orbit with its speed unchanged
(c) move in a circular orbit with its speed increased
(d) gets deflected vertically upwards.
Ans:b
23. Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current The force of attraction per unit length between the two wires is?
(a)2 x10^-7 N/m
(b) 2 x10^-8 N/m
(c) 5×10^-8 N/m
(d)10^-7 N/m
Ans:a
24. A galvanometer having a resistance of 8 ohms is shunted by a wire of resistance 2 ohms. If the total current is 1 amp, the part of it passing through the shunt will be?
(a)0.25 amp
(b) 0.8 amp
(c)0.2 amp
(d) 0.5 amp
Ans:b
25. A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be?
(a)2:1
(b)1:4
(c)4:1
(d)1:2
Ans:b
26. Magnetic field intensity in the centre of coil of 50 turns, radius 0.5 m and carrying a current of
2A is ?
(a) 0.5 x 10^-5 T
(b) 1.25x 10^-4 T
(c) 3x 10^-5 T
(c) 4 x 10^-5 T
Ans:b
27. When a proton is accelerated through I V, then its kinetic energy will be?
(a)1840 eV
(b) 13.6eV
(c)1 eV
(d) 0.54eV
Ans:c
28. If a long hollow copper pipe carries a current,thin magnetic field is produced
(a)inside the pipe only
(b)outside the pipe only
(c)both inside and outside the pipe
(d) no where
Ans:b
29. A charged particle moves through a magnetic field in a direction perpendicular to it. Then the
(a) velocity remains unchanged
(b) speed of the particle remains unchanged
(c) direction of the particle remains unchanged
(d) acceleration remains unchanged
Ans:b
30. Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance of 5 m between them. If P and Q carry current of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half-way between the wires is ?
(a)3µ/2∏
(b)µ/∏
(c)√3µ/2∏
(d)µ/2∏
Ans:a
31. A proton moving with a velocity 3 x 10⁵ m/s enters a magnetic field of 0.3 Tesla at an angle of 30° with the field. The radius of curvature of its path will be (e/m for proton – 10⁸ C/kg)
(a)2cm
(b) 0.5 cm
(c)0.02 cm
(d) 1.25 cm
Ans:b
32. A charged particle of charge q and mass m enters perpendicularly in a magnetic field B. Kinetic energy of the particle is E; then frequency of rotation is?
(a)qB/m∏
(b) qB/2m∏
(c)qBE/2m∏
(d) qB/2E∏
Ans:b
33. A galvanometer can be converted into a voltmeter by connecting?
(a) A high resistance in parallel
(b) A low resistance in series
(c) A high resistance in series
(d) A low resistance in parallel
Ans:c
34. A wire carries a current. Maintaining the same current it is bent first to form a circular plane coil of one turn which produces a magnetic field B at the centre of the coil. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre of the double loop, caused by the same current is ?
(a)4B
(b) B /4
(c) B/2
(d) 2B
Ans:a
35.A bar magnet is oscillating in earth’s magnetic field with a period T. What happens to its period of motion, if its mass is quadruped ?
(a) Motion remains simple harmonic with new period =T/2
(b) Motion remains simple harmonic with new period = 2 T
(c) Motion remains simple harmonic with new period =4T
(d) Motion remains simple harmonic and the period stays nearly constant
Ans:b
36. The work done in turning a magnet of magnetic moment M by an angle of 90° from the meridian, is n times the corresponding work done to turn it through an angle of 60°.
The value of n is given by
(a)2
(b) 1
(c) 0.5
(d) 0.25
Ans:a
37 . For protecting a sensitive equipment from the external electric arc, it should be ?
(a) Wrapped with insulation around it when passing current through it
(b) Placed inside an iron can
(c) Surrounded with fine copper sheet
(d) Placed inside an aluminium can
Ans:b
38. If a diamagnetic substance is brought near north or south pole of a bar magnet, it is?
(a) attracted by the poles
(b) repelled by the poles
(c) repelled by north pole and attracted by the south pole
(d) attracted by the north pole and repelled by the south pole
Ans:b
39. Current i is flowing in a coil of area A and number of turns N, then magnetic moment of
the coil is M= ?
(a) NiA
(b) Ni/A
(c)Ni/√A
(d) N²Ai
Ans:a
40. Two magnets of magnetic moments M and 2M are placed in a vibration magnetometer, with the identical poles in the same direction. The time period of vibration is T₁. If the magnets are placed with opposite poles together and vibrate with time period T₂ then ?
(a) T₂ is infinite
(b) T₂=T₁
(c)T₂>T₁
(d) T₂ is less than T₁
Ans:c
41. A diamagnetic material in a magnetic field moves
(a) perpendicular to the field
(b) from stronger to the weaker pans of the field
(c) from weaker to the stronger parts of the field
(d) in none of the above directions
Ans:b
42. According to Curie’s law, the magnetic susceptibility of a substance at an absolute
temperature T is proportional to?
(a) T²
(b) 1/T
(c) T
(d) 1/T²
Ans:b

electronics MCQ Objective solved questions for IES

electronics MCQ Objective solved questions for IES
Electronics engineering objective type questions
Solved Multiple Choice Questions Electronics engineering For SAIL GAIL ONGC IES
Engg Multiple Choice Questions: IES ELECTRONICS

1 Selenium photo cells are sensitive to the visible spectrum of
a) 400 – 700 mµ
b) 350 – 700 mµ
c) 300 – 700 mµ
d) 450 – 700 mµ
Ans : (c)


2 Respiratory volume is measured using
a) Myograph
b) Pneumograph
c) Spiro meter
d) Goniometer
Ans : (b)

3. Match the following
1. Sensitivity A. Ability to detect very small change
2. Stability B. Ability to produce constant output
3. Precision C. Measure of reproducibility
4. Accuracy D. Closeness to true value
a) 1- B, 2 - A, 3 - C, 4 - D
b) 1 - B, 2 - A, 3 - D, 4 - C
c) 1- C, 2 - A, 3 - B, 4 - D
d) 1 - A, 2 - B, 3 - C, 4 - D
Ans : (d)
4. Piezo electric materials have ___________ resistivity
a) Zero
b) Infinite
c) Finite
d) Null
Ans : (c)
5Dummy gauge is mounted on the opposite arm of the active gauge to cancel output differentials due to
a) Temperature variation of resistance
b) Pressure variation of resistance
c) pH concentration variation
d) Change in blood flow
Ans : (a)

6. For fiber optic sensors,
a) Single mode transmission is used
b) Multimode transmission is used
c) Both single mode and multimode transmission is used
d) Transmission is not used

Ans (a)

7 One of the combination of materials used for optical fibers are ___________
a) Copper core and glass cladding
b) Glass core and aluminum cladding
c) Glass core and plastic cladding
d) Plastic core and glass cladding
Ans (c)

8 The optical sensors may be classified as _________
a) Intensity and intrinsic types
b) Interferometric and extrinsic types
c) Intensity or intrinsic type and Interferometric or extrinsic types
d) Only extrinsic type
Ans (c)






9.The gauge factor is given as
a) ∆R/R
∆I/I
b) ∆I/I
∆R/R
c) ∆R/R
∆D/D
d) ∆D/D
∆R/R
Ans : (a)

10. The gauge factor G and the poisons ratio µ are related as
a) G = 1+µ
b) G = µ
c) G = 1+2µ
d) G = 1+µ /2
Ans : (a)


11. In variable capacitance transducer, C=
a) kξo/Ad
b) kξoA/d
c) kξod/A
d) Aξo/kd
Ans : (b)



12. Inductance of a coil is given by L =
a) N2R
b) N2 + R
c) N2 - R
d) N2 / R
Ans : (d)





13 ______________ is called as linistor when it provides a linear change in resistance with respect to temperature
a) Thermistor
b) Thermocouple
c) Thermometer
d) Thermo resistive transducer
Ans : (a)


14.. An operational amplifier is a
S1: Direct coupled high gain amplifier
S2: Device to perform linear operation
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (c)

15. The input impedance of the operational amplifier is
a) Infinite
b) Zero
c) Very high but not infinite
d) Very small
Ans : (c)

16. Power supply rejection ratio of an OPAMP should be
a) Ideally unity
b) Zero
c) As small as possible
d) As large as possible
Ans : (d)




17. The ideal value of CMRR is
a) 1
b) 0
c) -∞
d) ∞
Ans : (d)

18. To get very high input impedance ________________ is also used as an isolation amplifier.
a) Boost strapping circuit
b) Darlington pair
c) Push pull circuit
d) Emitter follower
Ans : (a)

19. Carrier amplifiers are characterized by
a) Low gain
b) Medium gain
c) High gain
d) Drift
Ans : (c)

20. DC amplifiers are generally
S1: Negative feedback type
S2: Positive feedback type
a) S1 is true & S2 is false
b) S2 is true & S1 is false
c) Both S1 & S2 are true
d) Both S1 & S2 are false
Ans : (a)

21. Isolation amplifiers are commonly used for providing protection against
a) Grounding
b) Leakage currents
c) Stray field
d) Shock

Ans : (b)
22 __________is the recording of the bio potentials generated by the movement of the eye ball.
a) Electro oculograph
b) Electro retinograph
c) Apexcardiograph
d) Ballistograph
Ans : (b)




23. The heart sounds are recorded by
a) Electrocardiography
b) Endoscope
c) Phono cardiograph
d) Angio cardiograph
Ans : (c)

24.. Type of laser used in photo chemical process is
a) CO2
b) Nd-YAG
c) He-Ne
d) Excimer lasers
Ans : (c)

25.. MRI makes use of the _____ region of the electromagnetic spectra to provide an image.
a) Ultra Violet
b) Radio Frequency
c) Infra Red
d) Ultra High frequency
Ans : (b)

26.. (A) Spin Density – (1) Signal is proportional to no. of nuclei present
(B) Spin lattice – (2) Longitudinal relaxation time
(C)Spin-spin – (3) Transverse relaxation time
a) A-1, B-2, C-3
b) A-2,B-3,C-1
c) A-3,B-1,C-2
d) A-2,B-1,C-3
Ans : (a)

27.. (A) A mode – (1) Reflected echoes are depicted as dots
(B) B mode – (2) unidirectional graphic representation
(C)M /T-M mode – (3) Reflected echoes are depicted as vertical spikes
a) A-1, B-2, C-3
b) A-2,B-3,C-1
c) A-3,B-1,C-2
d) A-2,B-1,C-3
Ans : (c)





28.. Ultra sound is a form of energy which consists of
S1: Mechanical vibrations of high frequency
S2: Elecrical vibrations of high frequency
a) S1 is true
b) S2 is true
c) S1 and S2 are true
d) S1 and S2 are false
Ans : (a)

29.. CT scanner is highly helpful in
a) Bone tumours
b) Thorax scanning
c) Neck scanning
d) Brain scanning
Ans : (d)

30. The first medical application of LASER was in
a) Gastrology
b) Bronchoscopy
c) Opthalmology
d) Cardiography
Ans : (c)

31. In D.C. defibrillator, a pulse width of 5 to 10 msec duration is generated by means of
a) Astable multivibrator
b) Monostable multivibrator
c) IC 555
d) Capacitor discharge
Ans : (d)

32.. Micro shock may occur due to flow of
a) 1 ampere current across body surface
b) Few milli ampere current across the cardiac muscles
c) 5 milli ampere current across the body surface for 1 minute
d) 5 milli ampere current across the body surface
Ans : (b)

33. The use of super conducting magnets in MRI is to obtain
a) Signals from surface tissue
b) High R.F. field
c) High strength gradient fields
d) High strength magnetic fields
Ans ; (d)