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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