PAF GDP
Physics mcqs which are frequently use till 146 GDP.
1-the study of charges at rest is called as:
electrostatics
2-the conversion of matter into energy includes the phenomenon of:
annihilation of matter
3-A photon loses all its entire energy during:
photoelectric effect
4- the capacitance of two capacitors combined in parallel would be:
2C
5-one light year=:
a- 9.5x1015m
6-the energy of a photon of wavelength 1 angstorm?
1.989x10-15
7-if the temperature of sun is increased 4 times then what would be the effect on the beat of earth?
a- 8
b- 4
c-16
8- a for award biased pn junction is:
closed switch
9-a reverse biased on junction is:
off switch
10- in a pure resistive circuit voltage and current are:
inphase
11-the unit of viscosity is:
Nsm-2
12- the angular acceleration of a body having 2Nm-2 moment of intertia and 2000 torque is:
1000rad/s2
13-the no. Of significant figures in 0.0001 is:
one
14-if two vectors of equal magnitude have a resultant also equal to their magnitude then the angle between them is:
120°
15- in the absence of an external force, the momentum of the body:
remains conserved
16- which of the following is a non conservative force:
frictional force
17- the velocity required to escape the earth's surface is:
11 kms-1
18- the relationship between linear and angular frequency is:
unknow answer
19- the force acting on a satellite is:
mv2/r
20- the unit for spin angular momentum is?
A joule second
21- for a body moving upwards:
w+ma
22-the place where area increases the velocity:
decreases
23- the angular acceleration is equal to:
-omega square x
24- which angle tells the displacement and direction as well:
phase
25- the energy absorption for reaonace is:
maximum
26- which waves are standing waves:
a- electromagnetic
b- longitudinal
c- transverse
27- for an aeroplane moving towards the airport the apparent frequency:
decreases
28- energy can neither be created nor destroyed is:
1st law
29- F/q is:
electric field intensity
30- resistivity is dependent on:
temperature
31- the motional emf of the rod increases with:
increase in velocity
32- a pn junction could be used as:
rectifier
33- the square of the average value is called:
mean square
34- the ratio of stress to strain is:
elastic modulus
35- stress is proportional to strain according to which law:
Hooke's law
36- high carbo steel is an example of;
brittle substance
37- a p type semi conductor results when the impurity is added from:
3rd group
38- the charge on a p type semi conductor is:
neutral
39- a photo diode is operated in:
reverse biasing
40- the most suitable idealization of black body is:
blackened surface with a hole
41- the emission of electron from a surface is:
photo electric effect
42- the frequncey in Compton effect:
decreases
43- photo electric effect shows the:
particle nature of light
44- the ionization potential energy for an electron is:
-13.6eV
45- the correct relation is:
half life= 0.693/lambda
46- a neutron is equal to:
one up n two down quarks
47- unit of mutual induction:
Henry H= A/S
48- phase change when wave travelled from densor to rare medium:
No phase change
49- capacitance in parrallel combination :
V= same and Q = different
50- capacitance in series combination :
V= different and Q = same
51- unit of power in case of volt:
Watt
52- helium atom is :
Alpha partical
53- photo electric effect show which nature of sub atomic partical:
Partical nature
54- what happen to frequency when source moves away from observer:
Pitch of sound decreas
55- when observer is in condition of moving what will be constant:
Wave length
56- when source moving then:
Velocity V = constant
57- dual nature mean :
Wave behave like partical and partical behave like wave
58- what happend to wave length and pitch of sound when observer move closer to source:
Wave length same and pitch of sound increase
59- who deviced the dual nature of sub atomic partical:
Debroglie in 1924
60- threshod frequency depend upon what:
Nature of material / metal and frequency of photon or incident photon frequency
61- unit of viscosity:
Nsm-2
62- unit of induction :
Henry H = A/s
63- the process when mass converted into energy :
Inhellation of matter
64- the emmission power of black body is:
Heighest monochromatic at all wavelength
65- the length of pendulum increase by 4 times then time period will be :
Two
66- which reaction take place in sun:
Fusion reaction
67- when light wave travelled from densor to rare medium it phase different will be:
No phase change
68- semi conducter has ..... valence band:
Half valence band
69- empty conductor band is :
Band of orbital that are high in energy and no free electron
70- addition of impurity to semi conducter is called:
Doping
71- P type material contain:
Holes
72- holes are partical that:
Vaccancy of electron
73- the largest e/m ratio is of :
Electron
74- the obsorption power of black body radiation is :
Remain same or constant
75- doner doping is in:
N type material
76- accepter doping is in:
P type material
77- when a paratroper jump from plain . His weight before opening parashoot is :
Double
78- weight of man on going up:
Decrease
79- 1 radian is equal to :
360° / 2 pi = 57.3°
80- dimension of viscosity:
[M° L-1 T-1]
81- dimension of acceleration :
[M° L° T-2]
82- dimension of power:
[ M° L2T-3]
83- unit of power:
Js-1= kg m2s-3
84- direction of current and potential difference :
In Phase
85- unit vector of 4i, 2j, 4k:
86- cross product of 4i, 6j :
87- if £t = 0 and £F = 0 then is it equillibrium :
Yes it is equillibrium
88- mechanical wave required :
Medium
89- example of tranverse wave :
Light wave ( mechanical wave)
90- what is standing wave:
Stationery wave
91- photo electric effect occur in :
Ultra violet light
92- centripetal force F= ?
F = mv2/ r
93- direction of centripital force:
Toword the center of circle
94- when a body move with speed of light it mass will be:
Zero ( because weightlessness created)
95- holes are :
P type material and negative by nature
96- in conductor the valence band is :
Valence band is above the bottom of conduction band.
97- germinium and silicon has valancy of:
4 valence
98- when impuroty added to germinium from 5th group the it is called :
Pentavalent ( N type)
99- 2 capacitor are joind parrallel the equivalent capacitor is :
2C
100- energy on sun due to:
Nuclear fusion
101- formula for acceleration in SHM:
102- ammeter used to measure:
Electric current
103- primery V= 220. If number of turn increase in secondry coil then what will be resistance :
Same
104- heighest e/m ratio is :
Electron
105- dimension of self induction :
[M° L2T-2A-2]
106- 1 ev = ?
1.602 x 10-19 j
107- megnetic lines are called :
Line of force
108- columb force F = ?
F = k q1q2/ r2
109- alpha partical are :
Helium nuclei
110- absolute zero in fahrenhight scale:
459.67
111- unit of megnetic flux:
Weber Nm/A
112- spectrum of black body:
Continous spectrum
113- second ionization of mercury:
X+ X2+ + e
114- device which just run AC voltage
Transfermer, capacitor, inductor and resister etc
115- when perpendiculer force act on body it will move on :
No motion but produce torque
116- unit of megnetic flux dencity:
Tesla T = wb/m2
117- equation of continuty:
A1V1= A2V2
118- partical nature shown by :
Photoelectric effect, compton effect, pair production and e/m ratio of electron
119- wave nature:
Interference, diffraction, polarization etc
120- when source moving then:
Wavelengrh = decrease, V= constant and f= increase
121- when observer moving then:
Wavelength= constant, v= increase, f = increase
122- mass convert to energy is:
Inhellation of matter
123- energy covert to mass:
Pair production.
124- in black body when temperature increase then:
Radiation will be richer in shorter wavelength
125- in black body when temperature decrease then:
Radiation will richer in high wavelength
126- temperature inversly proportional to wavelength only in case of:
Black body radiation
127- semi conductor is:
Partialy filled Valence and conduction band
128- p type material :
Holes ( trivalent)
129- N type material:
Electron ( pentavalent)
130- direction of centripetal force os toward:
Center of circle and remain constant
131- 0°K =?
273.16 C°
132- formula for kelvin K:
K = C° + 273
133- formula for fahrenhight F:
F = 9/5 ( C° + 32 )
134- formula for centigrade C:
C° = 5/9 ( F - 32 )
...... best of luck
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