MCQ
Magnets cannot be made from which of the following substances
- AIron
- BNickel
- ✓Copper
- DAll of the above
For example, wood, paper, water, copper, glass, gold, silver, etc, are non-magnetic substances.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Reason : Increase of ozone increases the amount of ultraviolet radiation on earth.


Reason : $N = {N_0}\,{\left( {\frac{1}{2}} \right)^n}$
where, $n = \frac{{{\rm{time\, elapsed}}}}{{{\rm{half \,life \,period}}}}$
