MCQ
The phenomenon of radioactivity is
- AExothermic change which increases or decreases with temperature
- BIncreases on applied pressure
- ✓Nuclear process does not depend on external factors
- DNone of the above
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Statement$- I$ : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature.
Statement$- II$: Diamagnetism is a result of orbital motions of electrons developing magnetic moments opposite to the applied magnetic field. Choose the $CORRECT$ answer from the options given below : -

| Object Pin | Convex Lens | Convex Mirror | Image Pin |
| $22.2\,cm$ | $32.2\,cm$ | $45.8\,cm$ | $71.2\,cm$ |
The focal length of the convex lens is $f_1$ and that of mirror is $f_2$. Then taking index correction to be negligibly small, $f_1$ and $f_2$ are close to