In isothermal process, which of the following is not true?
Temperature remains constant
Internal energy does not change
No heat enters or leaves the system
none of the above
Two equal -ve charges -q are fixed at the point (O, a) and (O, a) on the y-axis. A positive charge Q is released from rest at the point (2a, 0) on the x-axis. The charge will :
execute SHM about the origin
move to the origin and remain at rest
move to infinity
execute oscillatory but not SHM
A charge Q is distributed uniformly in a sphere (solid). Then, the electric field at any point r, where, r < R (r is the radius of sphere) varies as:
r -1
r
r -2
In the given circuit, what will be the equivalent resistance between the points A and B ?
10 / 3 Ω
20 / 3 Ω
10 / 5 Ω
5 Ω
If a charge particle enters perpendicularly in the uniform magnetic field, then:
energy and momentum both remains constant
energy remains constant but momentum changes
both energy and momentum changes
energy changes but momentum remains constant
A uniform wire of length I and having resistance R is cut into n equal parts and all parts are connected in parallel, then the equivalent resistance will be :
R
R/n
R/n2
n2R
In a L-C-R circuit, the capacitance is made one-fourth, then what should be changed in inductance, so that the circuit remains in resonance?
8 IMES
1/4 times
2 times
4 times
D.
4 times
In a RLC circuit , resonance phenomenon occurs when XL =XC or
Inductance should be changed to four times.
The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons?
3 eV
1.2 eV
0.6 eV
1.4 eV
1f the focal length of a lens of a camera is 5f and that of another is 2.5f, what is the time of exposure for the second, if for the first one is ? (where f is focal length / unit aperture)