PHYSICS-Electronics+Dawn of MP+Atomic Spectra (SMART INSTITUTE)
01-The device which processes the electrical signal and converts it into a useful action is called
Oscillator
Rectifier
Transducer
Diode
02-By which processes, the depletion region is formed around the junction
Diffusion
Fusion
Emission
Fission
03-In full wave rectification, the output D.C voltage across the load is obtained for ........
The positive half cycle of input A.C
The negative half cycle of input A.C
The complete cycle of input input A.C
All of the above
04-In the diagram, the input is across the terminals A and C and the output is across the terminals B and D, then the output is
Zero
Full wave rectifier
Same as input
Half wave rectifier
05-If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be
50 Hz
100 Hz
70.7 Hz
25 Hz
06-Output of half-wave rectifier is suitable only
To operate radio
For running a D.C motor
Charging batteries
All of these
07-To reduce ripples in the output of bridge rectifier, we should use
Diodes having low forward resistance
Diodes having high forward resistance
Low frequency A.C
A filter circuit
08-In a bridge rectifier, how many diodes conduct during each half cycle of input A.C
2
3
1
All
09-In a half wave rectifier, the frequency of the input is N, the frequency and form of the output will be
N/2 and pulsating
N and pulsating
2N and steady
N and continuous
10-The branch of Physics which deals with the electrons and their flow through devices is called
Electronics
Electricity
Electrostatics
Electromagnetism
11-The most common device used as filter is
Capacitor
Resistor
Transformer
Transistor
12-The types of rectifications are
3
5
4
2
13-During the interval 0.........>T/2 the forward biased diode offers
Very small resistance
Very small current flow through it
Very high resistance
Zero resistance
14-Rectification is possible by
Transistor
Amplifier
Diode
Capacitor
15-What will be A.C resistance of crystal diode at point P?
10 Ω
20 Ω
30 Ω
5 Ω
16-The resistance of p-region of a crystal diode is 6 Ω and the resistance of n-region is 3 Ω. The bulk resistance is
3Ω
9Ω
18Ω
1.5Ω
17-Mains A.C power is converted into D.C power for.....
Lighting purpose
Heaters
Using in electronics
None of above
18-In full wave rectifier, the diode conducts during
Both halves of the input cycle
A portion of the positive half-cycle of the input
Positive half-cycle of the input
Negative half-cycle or positive half-cycle
19-The method by which only one half of A.C cycle is converted into direct current is called
Half wave amplification
Half wave rectification
Full wave rectification
Full wave amplification
20-A PN junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The output current in the circuit is represented by:
0%
0
0%
0
0%
0
0%
0
21-Lyman series of H-atoms lie in the ..... Region of EM spectrum.
Visible
Infrared
Ultraviolet
Red
22-The prominent lines of the Balmer series lie in
Visible
Infrared
Ultraviolet
Red
23-When electron jumps from n^th to p^th orbit in an hydrogen atom then the wavelength of the emitted radiation is given by:
1/λ=RΗ [1/p^2 - 1/n^2]
1/λ=1/RΗ [1/p^2 - 1/n^2]
1/λ=RΗ [1/n^2 - 1/p^2]
1/λ=1/RΗ [1/4^2 - 1/n^2]
24-The hydrogen atoms are excited to the stationary state designated by the principal quantum number n=4. The number of spectral lines are observed
2
3
4
6
25-The maximum energy of the electrons released in a photo cell is independent of
Frequency of incident light
Intensity of incident light
Nature of cathode rays
None of these
26-The curve between photoelectric current ( I ) and frequency ( f ) is
0%
0
0%
0
0%
0
0%
0
27-Light of frequency 1.5 times the threshold frequency is incident on a photo sensitive material. If the frequency is halved and intensity is doubled, the photo-electric current becomes
Four times
Double
Half
Zero
28-On decreasing the intensity of incident light
The photoelectric current will increase
The number of photoelectrons emitted will increase
The number of emitted electrons will decrease
All of the above
29-If the intensity of incident light is made double, then the maximum number of emitted electrons will become
Double
Eight times
Four times
Half
30-Einstein's photoelectric equation is
1/2 mv^2(max) = hf
1/2 mv^2 =hf - Φ
1/2 mv^2 (max)= Φ
1/2 mv^2(max) = hf - Φ
31-Photon A has twice the energy of photon B. What is the ratio of the momentum of A to that of B?
2 : 1
1 :1
1 :2
None of these
32-The reverse process of photoelectric effect is
Annihilation of matter
Pair production
Production of X-rays
Nuclear fission
33-The Davison and Germer experiment indicates
Interference
Polarization
Electron diffraction
Refraction
34-If the wavelength of incident radiation in a photoelectric experiment is decreased then
The photoelectric current will decrease
The photoelectric current will increase
The stopping potential will decrease
The stopping potential will increase
35-In photoelectric effect, the graph showing the variation of cut-off voltage (Vo) with the frequency of incident radiation (f) is
0%
0
0%
0
0%
0
0%
0
36-WOF graphs represents correctly the variation of photoelectric current ( I ) with intensity ( I ) of incident radiations?
0%
0
0%
0
0%
0
0%
0
37-If E1, E2, E3 are the respective kinetic energies of an electron, an alpha-particle and a proton, each having the same de-Broglie wavelength then
E1>E3>E2
E2>E3>E1
E1>E2>E3
E1=E2=E3
38-Two photons of energy 2.5 eV each are incident on a metal plate whose work function is 4.0 eV, then the number of electrons are emitted from the metal surface will be.
One
More than two
Two
Electron emission is not possible
39-The magnitude of de-Broglie wavelength ( λ ) of electrons ( e ) proton ( p ) neutron ( n ) and @ particles-@ all have the same energy 1 MeV, in increasing order will follow the sequence.
λe, λp, λn, λ@
λ@, λn, λp, λe
λe, λp, λn, λB
λ@, λp, λn, λe
40-A photoelectric cell is illuminated by a point source of light 1 m away. When the source is taken 2 m away
The number of electrons emitted is a quarter of the initial number
The number of electrons emitted is half the initial number
Each electron emoitted carries one quarter of initial energy
Each emitted electron carries half the initial energy
41-(K.E.) max = hf - hfo is known as:
Compton equation
Planks equation
Newton's equation
Photoelectric equation
42-In a photoelectric effect experiment, the stopping potential is:
The electric potential that causes the electronic current to vanish
The photon energy
The kinetic energy of the most energetic electron ejected
The energy required to remove an electron from the sample
43-The wavelength of matter waves is independent of:
Mass
Momentum
Velocity
Charge
44-Stopping potential for a metal surface in case of photoelectric emission depends on ............
The threshold frequency for the metal surface
The intensity of incident light
The frequency of incident light and work function of the metal surface
All of these
45-In a photoelectric effect experiment at a frequency above threshold frequency, the number of electrons ejected is proportional to
The frequency of the incident light
Their potential energy
The number of photons that hit the sample
Their kinetic energy
46-For three different metals A, B, C photo-emission is observed one by one and maximum kinetic energy ( K ) versus frequency ( v ) of incident light graphs are plotted. Which fir. Represents the curves correctly:
0%
0
0%
0
0%
0
0%
0
47-The threshold wavelength for a metal whose work function is Wo is λo. What is the threshold wavelength for a metal whose work function is Wo/2 ?
λo/4
λo/2
2λo
4λo
48-Of the following moving with same momentum, the one which has largest wavelength is:
An electron
A proton
An @-particle
All have same de-Broglie
49-The work function of a metallic substance is 5 eV. The threshold frequency is approximately
1.6 x 10^7 Hz
8.68 x 10615 Hz
9.68 x 10^17 Hz
1.2 x 10^15 Hz
50-An ultraviolet light source causes the emission of photoelectrons from a Zinc plate. A more intense source of the same wavelength would give
Max energy/electron =more no. Of electrons /sec = the same
Max energy/electron = the same no. Of electrons /sec = more
Max energy/electron =the same no. Of electrons /sec = the same
Max energy/electron =more no. Of electrons /sec = more
51-A particle of mass M at rest decays into two masses m1 and m2 with non-zero velocities. The ratio of de-Broglie wavelengths of the particles λ1/λ2 is
M2/m1
ˆšm1/√m2
M1/m2
1 : 1
52-The energy of a photon is 3 x 10^-19 J. Its momentum is
10^-27 kg ms-1
10^-11 kg ms-1
9 x 10^-11 kg ms-1
3 x 10^-7 kg ms-1
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