1 |
Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is: |
3Ω
4Ω
4.5Ω
5Ω
|
2 |
Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate? |
4 eV
64 eV
32 eV
16 eV
|
3 |
The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space? |
<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">ρ = 0</span>
<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">ρ decreases linearly in the direction of the electric field</span>
<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">ρ increases linearly in the direction of the electric field</span>
<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">ρ has a uniform value throughout the region</span>
<br>
|
4 |
A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is: |
8 j
16 j
4 x 10<sup>-3</sup>j
2 x 10<sup>-3</sup>j
|
5 |
A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then |
The charge in the plates reduces and potencial difference increase
Potencial difference between the plates increase, stored energy decreases and charge remains the same
Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged
None of them
|
6 |
A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be: |
1884 ke V
1/1840 keV
1 keV
920 keV
|
7 |
Electric potencial of earth is taken to be zero because the earth is good: |
Semiconductor
Conductor
Insulator
Dielectric
|
8 |
Some charge is being given to a conductor. Then its potencial |
Its maximum at surface
Its maximum at Its maximum at center
Is remain same throughout the conductor
Is maximum somewhere between surface and centre
|
9 |
A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when: |
q=Q/4
q=Q/2
q=Q
None of these
|
10 |
Controlling rods inserted into the reactor are of metal: |
Aluminium
Cadmium
Magnesium
Copper
|
11 |
Nuclear fission was discovered by: |
Otto Hahn
Friz strassmann
Both a and b
Michaelson
|
12 |
Binding energy per nucleus for uranium is above: |
6.7 Mev
7.7 Mev
6.9 MeV
7.9 MeV
|
13 |
James chadwick discovered: |
Proton
Positron
Neutron
Electron
|
14 |
I amu = |
9.31 MeV
931 MeV
9.031 MeV
None of above
|
15 |
Before and after nuclear reaction the number of protons and neutrons: |
Must be different
Must be decreased
Must be increased
Remains same
|
16 |
Rutherford performed on experiment on a nuclear reaction in: |
1921
1981
1927
1932
|
17 |
The unit of radioactivity is: |
Bequerel
Henry
Pascal
Joule
|