A light and a heavy body have equal momenta. Which one has greater kinetic energy?
1.The light body
2.The heavy body
3.The kinetic energy is equal
4.Data is incomplete
Posted Date:-2021-12-08 11:00:46
A nuclide of the element plutonium 94 Pu 242. What is the number of neutrons in its nucleus?
1.242
2.336
3.148
4.94
Posted Date:-2021-12-08 10:53:20
From the following statements pick the correct statement about tunnel diode Statement 1: It uses the property of negative conductance Statement 2: In forward bias the fermilevel of p side becomes higher than the n side It operates at high frequency
1.1 only
2.1 and 3
3.3 only
4.2 and 3
Posted Date:-2021-12-08 09:31:23
If the K.E of a body is increased by 300% its momentum will increase by
1.100%
2.150%
3.200%
4.175%
Posted Date:-2021-12-08 11:11:17
If the stone is thrown up vertically and return to the ground, its potential energy is maximum
1.During the upward journey
2.At the maximum height
3.During the return journey
4.At the bottom
Posted Date:-2021-12-08 11:15:41
If the unit of force and length each be increased by four times, then the unit of energy is increased by
1.16 times
2.8 times
3.2 times
4.4 times
Posted Date:-2021-12-08 11:26:14
The number of protons or atomic number is reduced to 2 by which form of radioactive decay?
1.Beta-decay
2.Gamma decay
3.Alpha decay
4.None of the above
Posted Date:-2021-12-08 10:51:41
The outputs of a NAND gate is 0
1.If both inputs are 0
2. If one input is 0 and the other input is 1
3. If both inputs are 1
4. If both inputs are 1 or one of the inputs is 1 and the other one is 0
Posted Date:-2021-12-08 10:11:54
A a place where g = 980 cm/sec2 the length of seconds pendulum is about
1.50 cm
2.100 cm
3.2 cm
4.2 m
Posted Date:-2021-12-08 10:21:40
A body at rest may have
1.Energy
2.Momentum
3.Speed
4.Velocity
Posted Date:-2021-12-08 11:02:00
A body of mass 6 kg is under a force which causes displacement in it is given by S = t2/4 mts where t is time. The work done by the force in 2 seconds is
1.12 J
2.9 J
3.6 J
4.3 J
Posted Date:-2021-12-08 11:38:00
A body of mass M collides against a wall with a velocity V and retraces its path with the same speed. The change in momentum is (take the initial direction of the velocity as positive)
1.2 Mv
2.1 Mv
3.-2 Mv
4.Zero
Posted Date:-2021-12-08 11:46:56
A body of mass m kg is lifted by a man to a height of one metre in 30 seconds. Another man lifts the same mass to the same height in 60 seconds. The work done by them are in the ratio
1.1:2
2.1:1
3.2:1
4.4:1
Posted Date:-2021-12-08 11:31:36
A bottle of soap water is grasped by the neck and swings briskly in a vertical circle. Near which portion of the bottle do the bubbles collect
1.Near the bottom
2.In the middle of the bottle
3.Near the neck
4.Uniformly distributed in the bottle
Posted Date:-2021-12-08 10:54:56
A bucket tied at the end of a 1.6 m long spring is whirled in a vertical circle with constant speed. What should be the minimum speed so that the water from the bucket does not spill when the bucket is at the highest position?
1.4 m/sec
2.6.25 m/sec
3.16 m/sec
4.None of the above
Posted Date:-2021-12-08 10:56:04
A cane filled with water is revolved in a vertical circle of radius 4 metres and the water just does not fall down. The time period of revolution will be
1.1 sec
2.10 sec
3.8 sec
4.4 sec
Posted Date:-2021-12-08 10:57:52
A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of the body is
1.5 J
2.â…š J
3.6 J
4.75 J
Posted Date:-2021-12-08 11:33:07
A force of 5 N, making an angle θ with the horizontal, acting on an object displaces it by 0.4 m along the horizontal direction. If the object gains kinetic energy of 1 J, the horizontal component of the force is
1.1.5 N
2.2.5 N
3.3.5 N
4.4.5 N
Posted Date:-2021-12-08 11:35:14
A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement.
1.Kinetic energy of the system alone is conserved
2.Only momentum is conserved
3.Only momentum is conserved
4.Neither energy nor momentum is conserved
Posted Date:-2021-12-08 11:44:20
A light and a heavy body have equal kinetic energy. Which one has a greater momentum?
1.The light body
2.The heavy body
3.Both have equal momentum
4.Both have equal momentum
Posted Date:-2021-12-08 11:12:13
A logic gate is an electronic circuit which
1.Makes logic decisions
2.Allows electrons flow only in one direction
3.Woks binary algebra
4.Alternates between 0 and 1 values
Posted Date:-2021-12-08 10:05:25
A man pushes a wall and fails to displace it. He does (a)
1.Negative work
2.Positive but not maximum work
3.No work at alL
4.Maximum work
Posted Date:-2021-12-08 11:28:20
A metal ball falls from a height of 32 metres on a steel plate. If the coefficient of restriction is 0.5 to what height will the ball rise after the second bounce
1.4 m
2.8 m
3.2 m
4.16 m
Posted Date:-2021-12-08 11:50:22
A nuclear fission reaction becoming self-sustaining depends on
1.electrons
2.Neutrons
3.Energy
4.Protons
Posted Date:-2021-12-08 10:48:36
A particle executes S.H.M of amplitude A. At what distance from the mean position is its kinetic energy equal to its potential energy?
1.0.51 A
2.0.61 A
3.0.71 A
4.0.81 A
Posted Date:-2021-12-08 10:16:24
A particle of mass m is hanging vertically by an ideal spring of force constant k. If the mass is made to oscillate vertically, its total energy is
1.Maximum at extreme position
2.Maximum at mean position
3.Minimum at mean position
4.Same at all positions
Posted Date:-2021-12-08 10:20:28
A shell initially at rest explodes into two pieces of equal mass, then the two pieces will
1.Move with different velocities in different directions
2.Be at rest
3.Move with the same velocity in the same direction
4.Move with the same velocity in opposite directions
Posted Date:-2021-12-08 11:41:40
A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m/4 remains stationary. The velocity of the shell will be
1.(4/3)v
2.V
3.2 v
4.¾ v
Posted Date:-2021-12-08 11:48:41
A simple pendulum on length l and mass m is suspended vertically. The string makes an angle θ with the vertical. The restoring force acting on the pendulum is
1.mg tanθ
2.mg sinθ
3.– mg sinθ
4.– mg cosθ
Posted Date:-2021-12-08 10:17:22
A transistor has
1.Two p-n junctions
2.One p-n junction
3.Three p-n junctions
4.Four p-n junctions
Posted Date:-2021-12-08 09:44:18
A1 Kg stone at the end of 1 m long string is whirled in a vertical circle at a constant speed of 4 m/sec. The tension in the string is 6 N, when the stone is at
1.Top of the circle
2.Bottom of the circle
3.Halfway down
4.None of the above
Posted Date:-2021-12-08 10:57:04
As the temperature of a transistor goes up, the base-emitter resistance
1.Decreases
2.Increases
3.Remains the same
4.None of the above
Posted Date:-2021-12-08 10:00:55
Boolean Algebra is essentially based on
1.Truth
2.Logic
3.Symbol
4.Numbers
Posted Date:-2021-12-08 10:03:28
For a magnet of a time period T magnetic moment is M. If the magnetic moment becomes one-fourth of the initial value, then the time period of oscillation becomes
1.Half of the initial value
2.One-fourth of the initial value
3.Double of the initial value
4.Four times the initial value
Posted Date:-2021-12-08 10:23:56
For a tunnel diode, when p is the probability that the carrier crosses the barrier ‘W’ is the width ‘e’ is energy
1. p ∠1/e(-A*e*w)
2. p ∠e(-A*e*w)
3.p ∠1/e(A*e*w)
4.p ∠e(A*e*w)
Posted Date:-2021-12-08 09:39:26
Helium nuclei particles are called
1.Gamma particles
2.Beta particles
3.Alpha particles
4.No particles that are helium nuclei
Posted Date:-2021-12-08 10:49:47
How many depletion layers are there in a transistor
1.Four
2.One
3.Two
4.Three
Posted Date:-2021-12-08 09:42:34
How many NAND gates are used to form an AND gate?
1.1
2.2
3.3
4.4
Posted Date:-2021-12-08 10:06:25
How many NAND gates are used to form an AND gate?
1.1
2.2
3.3
4.4
Posted Date:-2021-12-08 10:06:29
If the linear momentum is increased by 50% the kinetic energy will increase by
1.50%
2.100%
3.125%
4.25%
Posted Date:-2021-12-08 11:14:40
If the momentum of a body is increased n times, its kinetic energy increase
1.n times
2. 2n times
3.n3 times
4.n2 times
Posted Date:-2021-12-08 11:02:48
In a transistor the input impedance is
1.Low
2.Very high
3.Almost zero
4.High
Posted Date:-2021-12-08 09:54:57
In an elastic collision of two particles the following is conserved
1.Speed of each particle
2.Kinetic energy of each particle
3.Total kinetic energy of both the particles
4.Momentum of each particle
Posted Date:-2021-12-08 11:40:41
In the construction of tunnel diode, why is the pellet soldered to anode contact and a tiny dot to the cathode contact via a mesh screen?
1.For better conduction and reduce inductance respectively
2.For better conduction and reduce inductance respectively
3.For heat dissipation and increase conduction respectively
4.For heat dissipation and reduce induction respectively
Posted Date:-2021-12-08 09:38:30
Isotopes of an element have a different number of
1.Proton
2.Neutron
3.Electron
4.atom
Posted Date:-2021-12-08 10:46:46
The atomic number is not changed by which type of radioactive decay?
1.Beta
2.Gamma
3.Alpha
4.The atomic number is affected by all forms of radioactive decay
Posted Date:-2021-12-08 10:45:53
The base of a transistor is …………. doped
1.Moderately
2.Lightly
3.Heavily
4.None of the above
Posted Date:-2021-12-08 09:41:42
The base-emitter junctions of a transistor is
1.a wide depletion layer
2. Low resistance
3.a reverse bias
4.None of these
Posted Date:-2021-12-08 09:47:11
The coefficient of restitution for a perfectly elastic collision is
1.1
2.0
3.∞
4.-1
Posted Date:-2021-12-08 11:45:14
The current carries in a PNP transistor is
1.Free electrons
2.Acceptor ions
3.Donor ions
4.Holes
Posted Date:-2021-12-08 09:46:02
The displacement of a particle performing simple harmonic motion is given by,x= 8 sin ωt + 6 cos ωt, where distance is in cm and time is in second. The amplitude of motion is
1.10 cm
2.14 cm
3.2 cm
4.3.5 cm
Posted Date:-2021-12-08 10:15:35
The energy stored in wound watch spring is
1.K.E
2.P.E
3.Heat Energy
4.Chemical Energy
Posted Date:-2021-12-08 11:16:33
The following truth table corresponds to the logic gate Input Output A B X 0 0 0 0 1 1 1 1 1 1 0 1
1. NAND
2.OR
3.AND
4.XOR
Posted Date:-2021-12-08 10:02:28
The length of the second’s pendulum on the surface of the earth is 1m. The length of the same pendulum on the surface of the moon, where the acceleration due to gravity is (⅙)th of the g on the surface of the earth is
1.36 m
2.1m
3.1/36 m
4.â…™ m
Posted Date:-2021-12-08 10:14:20
The logic behind NOR gate is that it gives
1.HIgh output when both the inputs are low
2.Low output when both the inputs are low
3.HIgh output when both the inputs are high
4.None of the above
Posted Date:-2021-12-08 10:04:28
The majority of the carriers from the emitter
1.Recombine in the emitter
2.Pass through the base of the collector
3.Recombine in the base
4.None of these
Posted Date:-2021-12-08 09:56:11
The mass and diameter of a planet are twice those of earth. The period of oscillation of pendulum on this planet will be (if it is a second’s pendulum on earth)
1.1/√2 second
2.2 x √2 second
3.2 second
4.½ second
Posted Date:-2021-12-08 10:18:26
The maximum velocity for a particle in S.H.M is 0.16 m/s and maximum acceleration is 0.64 m/s2 .The amplitude is
1.4 x 10-2 m
2.4 x 10-1 m
3.4 x 10 m
4.4 x 100 m
Posted Date:-2021-12-08 10:22:44
The neutral atoms of all isotopes of the same element contain the same number of __________.
1.neutrons only.
2.Electrons
3.Mass numbers
4.Masses
Posted Date:-2021-12-08 10:44:50
The output impedance of a transistor is
1.High
2.Zero
3.Low
4.Very low
Posted Date:-2021-12-08 09:58:28
The output of OR gate is 1
1.If both inputs are zero
2.If either or both inputs are 1
3.Only if both inputs are 1
4.If either input is zero
Posted Date:-2021-12-08 10:08:31
The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is
1.Moderately small
2.Extremely large
3.Extremely small
4.Depends on a particular case
Posted Date:-2021-12-08 11:39:29
The standing wave ratio is 4 for a transmission line of 75 ohms. What is the value of the minimum impedance?
1.75
2.300
3.18.75 (d)
4.150
Posted Date:-2021-12-08 10:30:03
The time period of a simple pendulum is T remaining at rest inside a lift. Find the time period of the pendulum when the lift starts to move up with an acceleration of g/3
1.T
2.T/2
3.2T/5
4.T√3/
Posted Date:-2021-12-08 10:13:32
The Tunnel diode is best suited for
1.Amplitude limiters
2.Amplifiers
3.Oscillators
4.Rectifiers
Posted Date:-2021-12-08 09:28:27
The tunnel diode is mainly used
1. To control the power
2.For very high speed of switchingTo control the power
3.For rectification
4.For fact chopping
Posted Date:-2021-12-08 09:26:54
The tunnelling involves
1.Acceleration of electron in p side
2.Movement of electrons from the n-side of the conduction band to the p-side of the valance band
3.Charge distribution management in both the bands
4.Positive slope characteristic of the diode
Posted Date:-2021-12-08 09:33:57
The tunnelling phenomenon is also known as
1.Bulk semiconductor phenomenon
2.Auto electronic phenomenon
3.Auto electric phenomenon
4.Esaki phenomena
Posted Date:-2021-12-08 09:29:25
The value of input impedance for a matched line will be equal to (a)
1.Load impedance
2.Characteristic impedance
3.Output impedance
4.Zero
Posted Date:-2021-12-08 10:25:18
The value of α of a transistor is
1.More than 1
2. Less than 1
3.1
4.None of the above
Posted Date:-2021-12-08 09:57:40
The work done against gravity in taking 10 kg mass at 1 m height in 1 sec will be
1. 49 J
2.98 J
3.196 J
4.None of the above
Posted Date:-2021-12-08 11:37:06
Three types of radioactive elements are emitted when unstable nuclei undergo radioactive decay. Which of the following is not one of them
1.Beta
2.Gamma
3.Alpha
4.delta
Posted Date:-2021-12-08 10:47:47
Tunnel diode operates very fast in the ………. region.
1.Gamma frequency region
2.Microwave frequency region
3.Radiofrequency region
4.Ultraviolet frequency region
Posted Date:-2021-12-08 09:30:25
Two balls at same temperature collide. What is conserved?
1.Temperature
2.Kinetic energy
3.Momentum
4.Velocity
Posted Date:-2021-12-08 11:46:08
What are the materials used to make the Tunnel diode?
1.AlGaAs
2.AlGaInP
3.ZnTe
4.Silicon and germanium materials
Posted Date:-2021-12-08 09:34:57
What is the normally chosen value of the characteristic impedance of a transmission line?
1. 50
2.75
3.50 or 75
4.100
Posted Date:-2021-12-08 10:27:12
When a retarding force is applied to stop a train, the train stops after 80 m. If the speed is doubled, then for the same retarding force, the distance when the train stops would be
1.The same
2.Doubled
3.Halved
4.Four times
Posted Date:-2021-12-08 11:29:17
When two atomic nuclei combine it is called as
1.Chain reaction
2.Nuclear fusion
3.Nuclear decay
4.Nuclear fission
Posted Date:-2021-12-08 10:50:46
When work is done on a body by an external force, its
1.kinetic energy increases
2.potential energy increases
3.Both kinetic energy and potential energy increases
4.Sum of the kinetic energy and potential energy remains constant
Posted Date:-2021-12-08 11:10:17
Which among the following is the reason for the depletion layer of the tunnel diode to be very small?
1.Dopants are high and it is abrupt
2.It’s used at very high-frequency ranges
3.Uses positive conductance property
4.Tunneling effect
Posted Date:-2021-12-08 09:32:23
Which logic gate is represented by the following combination of logic gates?
1.OR
2.NAND
3.AND
4.NOR
Posted Date:-2021-12-08 10:07:31
Which of the following logic gate is a universal gate?
1.OR
2.NOT
3.AND
4.NOR
Posted Date:-2021-12-08 10:10:10
Which statement is true for all three types of radioactive emission?
1.They are deflected by electric fields
2.They ionise gases
3.They are completely absorbed by a thin aluminium sheet
4.They emit light
Posted Date:-2021-12-08 10:52:36
Work done in raising a box depends on
1.How fast it is raised
2.The strength of the man
3.The height by which it is raised
4.None of the above
Posted Date:-2021-12-08 10:59:50
You lift a heavy book from the floor of the room and keep it in the bookshelf having a height of 2 m. This process takes 5 seconds. The work done by you will depend on
1.Mass of the book and the time taken
2.Weight of the book and height of the bookshelf
3.Height of the bookshelf and the time taken
4.Mass of the book, height of the bookshelf and the time taken
Posted Date:-2021-12-08 11:30:25