問題一覧
1
First nuclear reactor was established in
Chicago university
2
Fissionable fuels
U²³⁵ & U²³⁹
3
It decrease the energy of neutron
Moderator
4
It is used to absord the excess neutrons produced in fission of uranium nuclues
Control rod
5
It absorbs the heat and prevent excessive rise in temperature
coolant
6
It is used to produce electric energy from the energy released during fiasion
Nuclear reactor
7
A nuclear reactor which can be produce more fissionable fuels that it consumes
Fast breeder reactor
8
Energy released by sun or other stars is by
nuclear fusion
9
For nuclear fusion temprature of the oder of what is required
10⁸k
10
Hydrogen bomb was made in
1952
11
Albert Einstein received noble prize of physics in
1921
12
Earth receive what joule of energy per second from sun
4×10⁶
13
Mass of sun is decreasing at the rate of
4×10-⁹ kg/s
14
who gave mass energy relation on basis of special theory of relativity
Albert Einstein
15
who said that mass can be converted into energy and vice versa
Albert Einstein
16
When magnet is suspenseded freely it aligns itself in the direction of
North south direction
17
Where does magnet have less power
In the middle
18
Imaginary lines joining two poles of magnet is called
magnetic axis of magnet
19
Si unit of magnetism is
Newton/ampère meter or Weber/meter² or Tesla
20
Outside the magnet the magnetic lines of force form
North to south
21
Inside the magnet the magnetic lines of force form
South to North Pole
22
Substance which when placed in a magnetic field acquire feeble magnetism opposite to the direction of Magnetic field
Diamagnetic substance
23
Substance which when placed in a magnetic field acquire a feeble magnetism in the direction of the field
Paramagnetic substance
24
Substance which when placed in a magnetic field are strongly magnetised in the direction of field
Ferromagnetic substance
25
As temperature increases the magnetic property of ferromagnetic substance decreases and above a certain temperature the substance changes into paramagnetic substance, this temperature is called
curie temperature
26
As temperature increases the magnetic property of ferromagnetic substance
Decreases
27
Our earth south pole is near the geographical
North Pole
28
Our earth Nole pole is near the geographical
south pole
29
The acute angle between the magnetic Meridian and geographical Meridian at a place
declination
30
It is the angle which the resultant earth's magnetic field at a place makes with the horizontal.
Dip or inclination
31
At pole the dip is
90°
32
At equator the dip is
0°
33
Lines joining the place of same declination
isogonic lines
34
Lines joining the place of zero declination
Agonic lines
35
Lines joining the place of same dip
Isoclinic lines
36
Lines joining the point of zero dig
Aclinic lines
37
Lines joining the place of same value of horizontal component of earth's maflgnetic field
Isodynamic lines
38
Si unit of electric current
ampère
39
Current is
scalar quantity
40
1 ampère equals to
6.25×10¹⁸ Electron
41
Si unit of resistance is
Ohm
42
Reciprocal of resistance of conductor is
conductance
43
Si unit of conductance is
ohm-¹ / siemen / mho
44
Si unit of resistance is
Ohm meter
45
The reciprocal of resistivity of conductor
conductivity
46
1 kilowatt equals to
3.6×10⁶ joules
47
ammeter is connected in
series
48
resistance to ammeter is
0
49
Resistance of voltmeter is
infinite
50
Electric fuse are connected in
series
51
Pure fuse is made up of
Tin
52
Device used to detect and measure small electric current in a circuit
galvanometer
53
galvanometer can measure current upto
10-⁶ ampère
54
Wire of very small resistance
Shunt
55
It can be converted into ammeter by connecting a shunt parallel to it
Galvanometer
56
Galvanometer It can be converted into what by connecting a shunt parallel to it
ammeter
57
Direction of induced current is determined with the help of
Fleming right hand rule
58
what is determined with the help of Fleming right hand rule
direction of induced current
59
It is a device which Converts low voltage A.C into High voltage A.C & High voltage A.C into Low voltage A.C
transformer
60
This device connects mechanical Energy into electric energy
A.C dynamo or Generator
61
This device converts electric energy into mechanical Energy
electric motor
62
Converts sound energy into electrical energy
microphone
63
Electric field intensity inside a charged hollow conductor is
0
64
Si unit of electric potential is
volt
65
It is a point in a electric field is the work done in bringing a unit positive charge from infinity to that point
electric potential
66
Work done in bringing a unit positive charge from one point to other point
Potential difference
67
Charge required to increase the potential of the conductor by unity
electric capacity
68
Si unit of electric capacity
Farad
69
It is a device which converts chemical energy into electrical energy
electrochemical cells
70
Production of electricity by chemical reaction was first discovered by
Alexandero de Volta
71
Production of electricity by chemical reaction was first discovered in
1794
72
In voltaic cell what is used as cathode
zinc rod
73
In voltaic cell what is used as anode
Zinc rod
74
Zinc rod and copper rod in voltaic cell are placed in
sulphuric acid
75
In a leclanche cell what acts as anode
carbon rods
76
In a leclanche cell what acts as cathode
zinc rod
77
carbon rod and zinc rod in leclanche cell are placed in
ammonium chloride
78
The emf of leclanche cell is
1.5 volt
79
Emf of dry cell
1.5 volts
80
When Lens is thicker at the middle than the edge it is called
convex lens
81
When Lens is thicker at the edge than the middle it is called
concave Lens
82
power of lens
1/f
83
Si unit of power is
dioptre
84
power of convex lens is
positive
85
power of concave Lens is
negative
86
This rainbow formed due to two refraction and one Total internal reflection of light
primary rainbow
87
This rainbow formed due to two refraction and two Total internal reflection of light
secondary rainbow
88
Primary colors are
RBG
89
Green+ Red
yellow
90
Red+blue
magenta
91
Blue + Green
Cyan
92
Yellow+magenta+cyan
white
93
In color television which color is used
primary
94
Red rose appears red when viewed in
white or red light
95
Red rose appears black when viewed in
Blue or green light
96
when light ray la falls on small bodies such as dust particles and they are thorwn out in all directions, this phenomenon is called
tyndall effect
97
Scattering of light is max in
Violet
98
Scattering of light is min in
red
99
Red color of Rising and setting sun is due to
scattering of light
100
Lens of human eye consist
convex lens