Most Significant Engineering Objective Questions
Q – 1 Magnetic hysteresis phenomenon is explained by:
A. motion of domain walls
B. motion of domain walls and domain rotation
C. domain rotation
D. none of the above
Ans- Option B
Q – 2 A good dielectric should have:
A. low losses
B. good heat conductivity
C. high intrinsic strength
D. all of the above
Ans- Option D
Q – 3 The current flow in a semiconductor is due to:
A. holes
B. electrons
C. holes and electrons
D. holes, electrons and ions
Ans- Option C
Q – 4 Which of the following is used in automatic control of street lights?
A. Thermistor
B. Photo-conductor
C. Transistor
D. Varistor
Ans- Option B
Q – 5 The temperature coefficient of resistivity of semiconductors is:
A. positive
B. negative
C. may be positive or negative
D. very low
Ans- Option B
Q – 6 The units for electric dipole moment are
A. coulombs
B. colomb-metre
C. coulomb/metre
Ans- Option B
Q – 7 A piece of copper and another piece of Germanium are cooled from 30C to 80 K. The resistance of
A. copper decreases and germanium increases
B. both decreases
C. both increases
D. copper increases and germanium decreases
Ans- Option A
Q – 8 Diamagnetic materials do not have permanent magnetic dipoles.
A. True
B. False
Ans- Option A
Q – 9 A copper atom is neutral. Its core has a net charge of:
A. 0
B. + 1
C. – 1
D. + 2
Ans- Option B
Q – 10 There is no hysteresis phenomenon is any dielectric material.
A. True
B. False
Ans- Option B
Q – 11 The attraction between the nucleus and valence electron of copper atom is:
A. zero
B. weak
C. strong
D. either zero or strong
Ans- Option B
Q – 12 The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
A. True
B. False
Ans- Option B
Q – 13 In a coaxial cable, braided copper is used for:
A. conductor
B. shield
C. dielectric
D. jacket
Ans- Option B
Q – 14 Which element exhibits the property of inertia?
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance
Ans- Option C
Q – 15 In atomic physics, a state with l = 0 is called p state.
A. True
B. False
Ans- Option B
Q – 16 Material which lack permanent magnetic dipoles are known as:
A. paramagnetic
B. diamagnetic
C. ferromagnetic
D. ferrimagnetic
Ans- Option B
Q – 17 If the diameter of a wire is doubled, its current carrying capacity becomes:
A. one-fourth
B. half
C. twice
D. four times
Ans- Option D
Q – 18 The number of valence electrons in pentavalent impurity is:
A. 5
B. 4
C. 3
D. 1
Ans- Option A
Q – 19 Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be:
A. 0.08
B. 0.04
C. 0.001
D. 0.0001
Ans- Option C
Q – 20 The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be
A. 32 mH
B. 16 mH
C. 8 mH
D. 4 mH
Ans- Option D
Q – 21 Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.
A. True
B. False
Ans- Option B
Q – 22 Which capacitor-store higher amount of energy?
A. Air capacitor
B. Paper capacitor
C. Mica capacitor
D. Plastic film capacitor
Ans- Option C
Q – 23 Diamond is a paramagnetic material.
A. True
B. False
Ans- Option B
Q – 24 In a mortar, the binding material is:
A. cement
B. sand
C. surkhi
D. cinder.
Ans- Option A
Q – 25 The bodies which rebound after impact are called:
A. inelastic bodies
B. elastic bodies
C. neither elastic nor inelastic bodies
D. none of these
Ans- Option B
Q – 26 When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.
A. Correct
B. Incorrect
Ans- Option A
Q – 27 A body will begin to move down an inclined plane if the angle of inclination of the plane is __________ the angle of friction.
A. equal to
B. less than
C. greater than
Ans- Option C
Q – 28 Static friction is always __________ dynamic friction.
A. equal to
B. less than
C. greater than
Ans- Option C
Q – 29 The mechanical advantage of a lifting machine is the ratio of:
A. distance moved by effort to the distance moved by load
B. load lifted to the effort applied
C. output to the input
D. all of the above
Ans- Option B
Q – 30 Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
A. Yes
B. No
Ans- Option A
Q – 31 A smooth cylinder lying on its convex surface remains in __________ equilibrium.
A. stable
B. unstable
C. neutral
Ans- Option B
Q – 32 The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is:
A. sin θ
B. cos θ
C. tan θ
D. cosec θ
Ans- Option A
Q – 33 The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A. depends
B. does not depend
Ans- Option B
Q – 34 If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is:
A. 30
B. 60
C. 90
D. 120
Ans- Option D
Q – 35 According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
A. True
B. False
Ans- Option B
Q – 36 The friction experienced by a body, when in motion, is known as:
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction
Ans- Option B
Q – 37 Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity:
A. v
B. v/2
C. v/4
D. v/8
Ans- Option B
Q – 38 The term ‘force’ may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A. Agree
B. Disagree
Ans- Option A
Q – 39 The coefficient of restitution for elastic bodies is one.
A. Correct
B. Incorrect
Ans- Option B
Q – 40 Seven thousand volts can be expressed as:
A. 7 kV
B. 7 MV
C. 7 mV
D. either 7 kV or 7 mV
Ans- Option A
Q – 41 Which of the following is not an electrical quantity?
A. voltage
B. current
C. distance
D. power
Ans- Option C
Q – 42 The quantity 3.3 103 is the same as:
A. 330
B. 3,300
C. 33,000
D. 0.0033
Ans- Option B
Q – 43 When these numbers are added, (87 105) + (2.5 106), the result is:
A. 1.12 104
B. 11.2 105
C. 112 105
D. 1,120 106
Ans- Option C
Q – 44 When converting 0.16 mA to micro-amperes, the result is:
A. 16 A
B. 160 A
C. 1,600 A
D. 0.0016 A
Ans- Option B
Q – 45 The number 4.38 10-3 expressed as a number having a power of 10-6 is:
A. 4,380 10-6
B. 438 10-6
C. 43,800 10-6
D. 438,000 10-6
Ans- Option A
Q – 46 Fourteen milliamperes can be expressed as:
A. 14 MA
B. 14 A
C. 14 kA
D. 14 mA
Ans- Option D
Q – 47 What is (79 106)/(12 10-8):
A. 6,580 1012
B. 658 1010
C. 6.58 1014
D. 0.658 1016
Ans- Option C
Q – 48 When converting 1,600 kilohms to megohms, the result is:
A. 1,600,000 M
B. 160 M
C. 1.6 M
D. 0.160 M
Ans- Option C
Q – 49 The number 4,500,000 can be expressed as:
A. 4,500 106
B. 4.5 106
C. 4.5 10-3
D. either 4,500 103 or 4.5 106
Ans- Option B
Q – 50 Current is measured in:
A. watts
B. volts
C. henries
D. amperes
Ans- Option D
Q – 51 The quantity 43 10-3 is the same as:
A. 0.043
B. 0.430
C. 430
D. 43,000
Ans- Option A
Q – 52 The number of megohms in 0.03 kilohms is:
A. 0.00002 M
B. 0.0002 M
C. 3 10-5 M
D. either 0.00002 M or 0.0002 M
Ans- Option C
Q – 53 The number 0.0003 multiplied by 10-3 is:
A. 0.0000003
B. 0.0003
C. 3
D. 3,000
Ans- Option A
Q – 54 Voltage is measured in:
A. volts
B. farads
C. watts
D. ohms
Ans- Option A
Q – 55 The number 4.4 106 ohms expressed using a metric prefix is:
A. 4 k
B. 4.4 k
C. 4 M
D. 4.4 M
Ans- Option D
Q – 56 The number of micro-amperes in 2 milliamperes is:
A. 2 A
B. 20 A
C. 200 A
D. 2,000 A
Ans- Option D
Q – 57 The number of millivolts in 0.06 kilo-volts is:
A. 600 V
B. 6,000 mV
C. 60,000 mV
D. 600,000 mV
Ans- Option C
Q – 58 Eighteen thousand watts is the same as:
A. 18 mW
B. 18 MW
C. 18 kW
D. 18 W
Ans- Option C
Q – 59 The number 3.2 10-5 A expressed using a metric prefix is:
A. 32 A
B. 3.3 A
C. 320 mA
D. 3,200 mA
Ans- Option A
Q – 60 Resistance is measured in:
A. henries
B. ohms
C. hertz
D. watts
Ans- Option B
Q – 61 The number 65,000 expressed in scientific notation as a number between 1 and 10 times a power of ten is:
A. 0.65 104
B. 6.5 104
C. 65 104
D. 650 103
Ans- Option B
Q – 62 When converting 7,000 nA to microamperes, the result is:
A. 0.007 A
B. 0.7 A
C. 700 A
D. 7 A
Ans- Option D
Q – 63 The number of kilowatts in 135 milliwatts is:
A. 1.35 10-4 kW
B. 135 10-3 kW
C. 0.0135 kW
D. 0.00135 kW
Ans- Option A
Q – 65 When these numbers are multiplied, (6 103) (5 105), the result is:
A. 3 108
B. 30 108
C. 300 109
D. 3,000 107
Ans- Option B