In the given network capacitance, 
and 
. What is the resultant capacitance between A and B
|
(a) 2.2 μF |
(b) 3.2 μF |
(c) 1.2 μF |
(d) 4.7 μF |
(b) 3.2 μF
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Two coherent light sources S1 and S2 (l= 6000 Å) are 1mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be
|
(a) 0.015 cm |
(b) 0.025 cm |
(c) 0.010 cm |
(d) 0.030 cm |
An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
Choose the correct statement from the following
|
(a) |
(b) |
(c) |
(d) |
A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is
|
(a) Less than 1 mg |
(b) |
(c) |
(d) 1 gm |
The graph Shows the variation in magnetic flux ∅(t) with time through a coil. Which of the statements given below is not correct
|
(a) There is a change in the direction as well as magnitude of the induced emf between B and D |
|
(b) The magnitude of the induced emf is maximum between B and C |
|
(c)There is a change in the direction as well as magnitude of induced emf between A and C |
|
(d) The induced emf is zero at B |
Assertion : Electron capture occurs more often than positron emission in heavy elements.
Reason : Heavy elements exhibit radioactivity.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
In the circuit as shown in the figure the effective capacitance between A and B is
|
(a) 3 μF |
(b) 2 μF |
(c) 4 μF |
(d) 8 μF |
One proton beam enters a magnetic field of 
T normally, Specific charge = 
. velocity = 
. What is the radius of the circle described by it
|
(a) 0.1 m |
(b) 1 m |
(c) 10 m |
(d) None of these |
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40KeV electrons, is approximately (h = 6.63 
)
|
(a) 300 Å |
(b) 10 Å |
(c) 4 Å |
(d) 0.31 Å |
