Two capacitors each of capacity 2 μF are connected in parallel. This system is connected in series with a third capacitor of 12 μF capacity. The equivalent capacity of the system will be
|
(a) 16 μF |
(b) 13 μF |
(c) 4 μF |
(d) 3 μF |
(d) 3 μF
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For a given plate-voltage, the plate current in a triode is maximum when the potential of
|
(a) The grid is positive and plate is negative |
(b) The grid is positive and plate is positive |
|
(c) The grid is zero and plate is positive |
(d) The grid is negative and plate is positive |
An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is 5 
phot (lumen/cm2). The line joining the bulb to the point makes an angle of 60o with the normal to the surface. The intensity of the bulb in candela is
|
(a) 40 |
(b) 40 |
(c) 20 |
(d) 40 |
Assertion : Only microwaves are used in radar.
Reason : Because microwaves have very small wavelength.
|
(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. |
Speed of recession of galaxy is proportional to it's distance
|
(a) Directly |
(b) Inversely |
(c) Exponentially |
(d) None of these |
The length of Milky way is
|
(a) 100,000 light years |
(b) 10,000 light years |
(c) 1000 light years |
(d) 100 light years |
$\overrightarrow{\text{F}}.\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}.\overrightarrow{\text{r}}$
If n, e, τ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length l and area of cross-section A will be
|
(a) |
(b) |
(c) |
(d) |
