Containing physics MCQ Questions on
magnetic field intensity
(d) Young’s modulus
(a) area between the distance-time graph and distance axis
(b) area between the speed-time graph and time axis
(c) area between the distance-time graph and time axis
(d) area between the speed-time graph and distance axis.
(d) alpha particle
(b) moments of forces
(d) masses of pans
7. When two quantities are plotted on the graph paper against each other and the result so obtained is a st. line, then
(a) Both the quantities are equal
(b) The quantities are inversely proportional to each other
(c) Sum of both is zero
(d) The quantities are proportional to each other
8. What is the order of magnitude of 260°?
9. The maximum value of g is:
(a) At the poles
(b) At the top of the Mount Everest
(c) At the equator
(d) Below the sea level
(a) 12 Newtons
(b) 8 Newtons
(c) 4 Newtons
(d) 1 Newton
(a) conservation of energy
(b) conservation of momentum
(c) conservation of mass
(d) conservation of temperature
(a) Area of sharp knife is much less than the area of the blunt one
(b) sharp knife is brighter
(c) sharp knife is colder
(d) sharp knife is costly
In this he does?
(a) maximum work
(b) no work
(c) negative work
(d) minimum work
(a) 4 sec.
(c) 2 sec.
(b) 1 sec
(d) 3 sec.
(a) gas thermometer
(b) mercury thermometer
(d) maximum-minimum thermometer
(a) go up
(b) remain the same
(c) go down
(d) first go up then go down
(a) radiations of all wavelengths
(b) no radiations
(c) radiations of only one wavelength
(d) radiations of selected wavelengths
(a) heat content remains constant
(b) temperature remains constant
(c) both heat content and temperature remain constant
(d) pressure and temperature of the gas remain constant
(d) 660 m.
(d) 2 cm
(b) greater than one
(c) less than one
(d) equal to one
(a) a convex tens of 10 cm. focal length
(b) a concave lens of 10 cm. focal length
(c) a convex lens of focal length greater than 10cm.
(d) a convex lens of focal length less than 10 cm.
29. Two particles having charges q1 and q2 when kept at a certain distance exert a force F on each other. If the distance between the two particles is reduced to half and the charge on each particle is doubled the force between the particles would be ?
(c) no motion at all
(d) rotation as well as translation
(a) the potential is zero but the electric field is finite
(b) the electric field is zero but the potential is finite
(c) both the electric field and the potential are finite
(d) both the electric field and the potential are zero
(b) 200 Watts
(d) 50 Watts
(a) a device for stepping up D.C.
(b) a generator of current
(c) device for converting direct current into alternating current
(d) a device for stepping up or down the voltage of A.C. supply
(d) thermionic valve
(a) there is more blue light in the sunlight
(b) of scattering of sunlight by air molecules in the atmosphere
(c) of scattering of sunlight by dust particles in the atmosphere
(d) other colours are absorbed by heavenly bodies
pressure there is a:
(b) gradual rise
(d) gradual fall
(a) increases towards the centre
(b) decreases towards the centre
(c) is finite and constant throughout
(d) is zero
(a) which contain impurities
(b) which do not obey Charle’s and Boyle’s laws
(c) whose molecules are not spherical
(d) whose molecules cannot be regarded as point masses
(a) location and ranging of aircraft’s
(b) location and ranging submarines
(c) producing a musical note of high quality
(d) measuring frequency of musical notes
(a) atomic energy
(b) high energy electrons
(c) high energy photons
(d) high energy protons
(a) the lead ball reaches the ground earlier
(b) the 1 kg. steel bail reaches the ground earlier
(c) all the balls reach the ground simultaneously
(d) the 2 kg. steel ball reaches the ground earlier
(a) has great energy stored in it
(b) possesses mechanical potential energy stored in it
(c) has eletrical energy stored in it
(d) has no energy in it
(a) ray going from water to glass
(b) a ray going from glass to water
(c) a ray going from glass to air
(d) a ray going from water to air.
(a) the violet ray
(b) the red ray
(c) the green ray
(d) the yellow ray
(a) the rotation of the earth
(b) the revolution of the earth
(c) the rainy season
(d) the appearance off Sun spots
(a) It converts the electrical energy into light energy
(b) It converts the kinetic energy into heat energy
(c) It converts the mechanical energy into electrical energy
(d) Jt converts the electrical energy into mechanical energy.
(a) a varying electric field
(b) a varying magnetic field
(e) a motion of the secondary coil
(d) efficiency of the operator
(a) converter of energy
(b) source of electric charge
(c) source of magnetic charge
(d) source of energy
plane becomes ?
(a) inclined at 45° to the magnetic field
(b) inclined at any arbitrary angle to the
(c) parallel to the magnetic field
(d) perpendicular to magnetic field
(a) magnetic flux
(b) magnetic field
(c) magnetic induction
(d) magnetic moment
form of ?
(a) electric field
(b) magnetic field
(c) dielectric strength
(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.
(a) 3.33 x 10-4 T
(b) 1.11x 10-4 T
(c) 3×10-3 T
(d) 9×10-3 T
(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
(b) 0.5 cm
the same B is
(b) 50 keV
(d) 100 keV
(c) 3.0 N
(d) 2.0 N
(a) low resistance in parallel
(b) high resistance in parallel
(c) low resistance in series
(d) high resistance in series.
(a) torque is formed
(B) e.m.f is induced
(c) both (a) and (b) are correct
(d) none of the above
(b) 0.8 Tesla
(d) 1.6 Tesla
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.
(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
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
(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
(b) 20 m/s
(d) 1/40 m/s
(b) 0.21 Ohms
(c) 0.08 Ohms
(d) 0.05 Ohms
(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.
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
(b) 0.8 amp
(d) 0.5 amp
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
(a)inside the pipe only
(b)outside the pipe only
(c)both inside and outside the pipe
(d) no where
(b) speed of the particle remains unchanged
(c) direction of the particle remains unchanged
(d) acceleration remains unchanged
(b) 0.5 cm
(d) 1.25 cm
(a) A high resistance in parallel
(b) A low resistance in series
(c) A high resistance in series
(d) A low resistance in parallel
(b) B /4
(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
The value of n is given by
(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
(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
the coil is M= ?
(a) T2 is infinite
(d) T2 is less than T1
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
42. According to Curie’s law, the magnetic susceptibility of a substance at an absolute
temperature T is proportional to?
Basic Electronics Quiz
(a) the positive pole of the battery is joined to the p-semiconductor and negative pole to the n-semiconductor
(b) the positive pole of the battery is joined to the n-semiconductor and negative pole of the battery is joined to the p-semiconductor
(c) the positive pole of the battery is connected to n- semiconductor and p- semiconductor
(d) a mechanical force is applied in the forward direction
(d) none of these
(a) number of electrons increases while that of holes decreases
(b) number of holes increases while that of electrons decreases
(c) number of electrons and holes remain same
(d) number of electron and holes increases equally.
voltage is ?
6. When a triode is used as an amplifier the phase difference between the input signal voltage and
the output is ?
(a) drift of holes
(b) diffusion of charge carriers
(c) migration of impurity ions
(d) drift of electrons
8. The following truth table corresponds to which Logic gate
(a) The emitter base junction is forward biased and the base collector junction is reversed biased
(b) no bias voltage is required
(c) both junction are forward biased
(d) both junctions are reversed biased.
(c) Vander Walls
(a) the cathode
(b) the grid
(c) the glass-envelope
(d) the anode
(b) resistance of copper will decrease
(c) the resistance of copper will increase while that of germanium will decrease
(d) the resistance of copper will decrease while that of germanium will increase
(a) it is covalent solid
(b) it has large cohesive energy
(c) high melting point
(d) insoluble in all solvents
(d) any of the above depending upon the nature of transistor
15. An Oscillator is nothing but an amplifier with
(b) negative feedback
(d) no feedback
(a) diffusion of charge
(b) drift charges
(c) depends on the nature o material
(d) both drift and diffusion of charges
(d) both ‘b’ and ‘c’
(d) 0.43 mA
21. When a n-p-n transistor is used as an amplifier then ?
(a) the electrons flow from emitter to collector
(b) the holes flow from emitter to collector
(c) the electrons flow from collector to emitter
(d) the electrons flow from battery to emitter
(a) n-type semiconductor
(b) p-type semiconductor
(c) n-type conductor
(a) A p-n junction
(b) An intrinsic semi-conductor
(c) A p-type semi-conductor
(d) An n-type semi-conductor
(b) 0.01 mA
(d) 500 microA
(a) Depletion of positive charges near the junction
(b) Concentration of positive charges near the junction
(c) Depletion of negative charges near the junction
(d) Concentration of positive and negative charges near the junction
(c) remains constant
(d) first increases then decreases
(d) immobile ions
29. Which of the following when added acts as an impurity into silicon produced n-type semi
(b) extra electrons
(d) missing electrons
(a) The potential of the p and n sides becomes higher alternately
(b) The p side is at higher electrical potential than the n side
(c) The n side is at higher electrical potential than the p side
(d) Both the p and n sides are at the same potential
tipple will be
(d) 70.7 Hz
36. A n-p-n transistor conducts when ?
(a) both collector and emitter are negative with respect to, the base
(b) both collector and emitter are positive with respect to the base
(c) collector is positive and emitter is negative with to the base
(d) collector is positive and emitter is at same potential as the base
(b) diode design
(d) forward bias
(a) increases the minority carrier current
(b) lowers the potential barrier
(c) raises the potential barrier
(d) increases the majority carrier current
(b) the valence band is partially empty and the conduction band is partially filled
(c) the valence band is completely filled and the conduction band is partially filled
(d) the valence band is completely filled
(a) if either input is zero
(b) if both inputs are zero
(c) if either or both inputs are 1
(d) only if both inputs are I
(a) the voltage applied at the p-n junction
(b) the barrier voltage at the p-n junction
(c) the intensity of the light falling on the cell
(d) the frequency of the light falling on the cell
(a) in conductors the valence and conduction bands may overlap.
(b) Substances with energy gap of the order of 10 eV are insulators.
(c) The resistivity of a semiconductor increases with increase in temperature.
(d) The conductivity of a semiconductor increases with increase in temperature.
(a) (Eg)C> (Eg)Si
(b) (Eg)C< (Eg)Si
(d) (Eg)C< (Eg)Ge
44. Application of a forward bias to a p—n junction
(a) widens the depletion zone.
(b) increases the potential difference across the depletion zone.
(c) increases the number of donors on the n side.
(d) increases the electric field in the depletion zone.
(d) Producing oscillations in an oscillator
Digital Electronics Test
DIGITAL ELECTRONICS OBJECTIVE QUESTIONS
(a) Base 10
(b) Base 16
(d) Base 3
3. What is the octal equivalent of the binary number:
(a) In a positional number system, each symbol represents the same value irrespective of its position
(b) The highest symbol in a position number system as a value equal to the number of symbols in the system
(c) It is not always possible to find the exact binary
(d) Each hexadecimal digit can be represented as a sequence of three binary symbols.
6.A NAND gate is called a universal logic element because
(a) it is used by everybody
(b) any logic function can be realized by NAND gates alone
(c) all the minization techniques are applicable for optimum NAND gate realization
(d) many digital computers use NAND gates.
(a) less expensive
(b) always more accurate and faster
(c) useful over wider ranges of problem types
(d) easier to maintain.
(a) floating point hardware is costly
(b) it is slower than software
(c) it is not possible to perform floating point addition by hardware
(d) of no specific reason.
(a) FFFF (hex)
(b) 1111 (binary)
(c) 7777 (octal)
(d) All of the above.
10. (1(10101)2 is
(b) ( 69)10
(c) (41 )10
(d) — (5)10
(b) 22 n
(d) — 2n
(a) Two’s complement only
(b) Sign and magnitude and one’s complement only
(c) Two’s complement and one’s complement only
(d) All three representations.
(a) logic 0 and 1 are represented by 0 and positive voltage respectively
(b) logic 0 and, -1 are represented by negative and positive voltages respectively
(c) logic 0 voltage level is higher than logic 1 voltage level
(d) logic 0 voltage level is lower than logic 1 voltage level.
(a) OR gate
(b) NAND gate
(c) EXCLUSIVE OR gate
(d) NOT gate.
synchronous counter is
(a) all the inputs to the gates are “1”
(b) all the inputs are ‘0’
(c) either of the inputs is “1”
(d) all the inputs and outputs are complemented.
(a) an astable MV
(b) a bistable MV
(c) a latch
(d) a monostable MV.
(a) have lower fabrication area
(b) can be used to make any gate
(c) consume least electronic power
(d) provide maximum density in a chip.
(a) 1 at any input causes the output to be at logic 1
(b) 1 at any input causes the output to be at logic 0
(c) 0 any input causes the output to be at logic 0
(d) 0 at any input causes the output to be at logic 1.
(a) Weighted code
(b) Cyclic redundancy code
(c) Self-complementing code
(d) Algebraic code.
(d) None of the above.
1.1011 + 1010 = 10101
II. 1010 + 1101 = 10111
III. 1010 + 1101 = 11111
(a) I and II
(b) II and III
(c) III only
(d) II and III
MCQ QUIZ Sample test on
Basics of Digital Gates
Hardware Families like IIL TTl CMOS
(a) an stable multivibrator
(1) a monostable multivibrator
(c) a bistable multivibrator
(a) memory mapped I/O
(b) I/O mapped I/O
(c) Interrupt driven I/O
(b) aperture effect
(d) impossible reconstruction.
(a) Shift registers
(c) A/D converters
(d) Combinational Circuits
(assume 0 = 0 Vand 1 = + 10 V)
(a) Successive approximation
(b) Weighted resistor technique
(c) Dual slope technique
(d) Single slope technique
make up 1K (1024) bytes of memory is
1. A flip-flop is used to store 1-bit of information
2. Race-around condition occurs in a J-K flip-flop when both the inputs are 1.
3. Master-slave configuration is used in flip-flops to store 2-bits of information.
4. A transparent latch consists of a D-type flip-flop.
(c) – 128
(d) – 127
(a) can be triggered only once
(b) has two quasi-stable states
(c) cannot be triggered until full pulse has been outputted.
(d) is capable of being triggered while the output is being generated.
(a) is faster
(b) is more accurate
(c) uses fewer gates
(d) costs less
(b) l’s complement
(c) 2’s complement
(d) 9’s complement
(a) 1000000 bytes
(b) 1000024 bytes
(c) 1024000 bytes
(d) 1048576 bytes
(a) constant pulses
(b) exponentially decaying pulses
(d) exponentially rising pulses
(a)100 micro sec
(b)20 micro sec
(c) 10 micro sec
(d) 5 micro sec
(a) remain same
(b) be doubled
(c) be tripled
(d )be four times
(b)(143) base 6
where y(n) and x(n) represent output , input sequences respectively. The system is
(a) linear and causal
(b) linear and noncausal
(c) nonlinear and causal
(d) nonlinear and noncausal.
(a) an astable multivibrator only
(b) a monostable multivibrator only
(c) a frequency divider only
(d) an astable multivibrator or a monostable muttivibrator or a frequency divider
(a) high speed TTL
(b) low power TTL
(c) standard Schottky TTL
(D) low power Schottky TTL
Assertion (A) The modernization process has challenged the hold caste system in India.
Reason (R) Mobility as a phenomenon of change in caste system does not challenge the basic structure of caste.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true, but R is not the correct explanation of A
(c) A is true, but R is. false
(d) A is false, but R is true
Reason (R) : Each memory location of a programmable Read- Only-Memory is programmable and can be read synchronously.
Reason (R) It uses two JK flip flops in cascade.
Reason (R): A demultiplexer selects one of many outputs whereas a decoder selects an output corresponding to the coded input.
Reason (R) : The differentiators using operational amplifiers cannot be designed.
Reason (R) : The design of self-biasing circuit is very easy as compared to other
Reason (R) : To obtain the 2’s complement of a number, the hardware required is simple.
Reason (R) : It is not possible to realize any Boolean function using XOR gates only.
Reason (R) : The transistors in ECL gate operate in the active region.
Reason (R) The instruction set of a microprocessor is stored inside the ALU
38. Assertion (A) In a heterodyne digital counter, the input signal is heterodyned to a lower frequency
Reason (R) The gating and counting circuits of a digital counter cannot handle GHz signals.
Reason (R) Dual-slope A/D converter,provides high accuracy in A/D conversion while at the same time
suppressing the hum effect on the input signal.
Reason (R) In a combinational circuit, the current output depends on the previous outputs also.
Z2- 4z + 4 = 0 is unstable
Reason (R) : Sampled data systems with positive roots of the characteristic equation are unstable.
Reason (R) All components of a signal are presented simultaneously in the frequency domain. In swept type spectrum analyzer, frequencies are supplied one at a time at a particular rate.
Reason (R) ROM can be accessed for alteration.
7. Logic gate ECL is characterized by