The essential distinction between X-rays and γ - rays is that
| (a) γ- rays have smaller wavelength than X-rays |
|
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom |
| (c) γ- rays have greater ionizing power than X-rays |
| (d) γ- rays are more penetrating than X-rays |
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom
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In Young's double slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be
|
(a) 1 |
(b) 1/9 |
(c) 1/4 |
(d) 1/3 |
Before the saturation state of a diode at the plate voltages of 400 V and 200 V respectively the currents are i1 and i2 respectively. The ratio i1/i2 will be
(a) 
|
(b) 2
|
(c) 2 | (d) 1/2 |
Assertion : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason : A charged particle produces a magnetic field.
|
(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. |
n equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance
|
(a) n |
(b) |
(c) |
(d) |
The decay constant of a radioactive element is 0.01 per second. Its half life period is
|
(a) 693 sec |
(b) 6.93 sec |
(c) 0.693 sec |
(d) 69.3 sec |
$\overrightarrow{\text{F}}.\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}.\overrightarrow{\text{r}}$
The principle of controlled chain reaction is used in
| (a) Atomic energy reactor | (b) Atom bomb |
|
(c) The core of sun |
(d) Artificial radioactivity |
