- AIncreases when temperature is increased.
- BDeccreases when temperature is increased.
- CRemains same at all temperature.
- DDepends on the pressure of the gas.
Explanation:
Area under the Maxwell's velocity distribution curve gives the number of particles. Since number of particles remains the same at all the temperatures, so the area under the curve also remains the same at all temperature.
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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be
|
(a) More with 40 bulbs than with 39 |
(b) More with 39 bulbs than with 40 |
|
(c) Equal in both the cases |
(d) In the ratio of |
The internal resistance of a cell of e.m.f. 12V is 5 . It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is
|
(a) 15 V |
(b) 12 V |
(c) 9 V |
(d) 6 V |

A double star is a system of two stars rotating about their centre of mass only under their mutual gravitational attraction. Let the star have mass m and 2m and their separation be l. Their time period of rotation about their centre of mass will be proportional to
|
(a) |
(b) l |
(c) |
(d) |
For a transistor, in a common emitter arrangement, the alternating current gain b is given by
|
(a) β = |
(b) β = |
(c) β = |
(d) β = |
By corpuscular theory of light, the phenomenon which can be explained is
|
(a) Refraction |
(b) Interference |
(c) Diffraction |
(d) Polarisation |
The activity of a radioactive sample
|
(a) Can be increased by heating it |
(b) Is independent of physical parameter |
|
(c) Cannot be increased by any method |
(d) Both (b) and (c) |