MCQ
Approximate height of ozone layer above the ground is
- ✓$60\;km$ to $70\, km$
- B$59 \,km$ to $80 \,km$
- C$70\, km$ to $100 \,km$
- D$100 \,km$ to $200 \,km$
✓
Answer
Correct option: A.
$60\;km$ to $70\, km$
a
(a)
(a)
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A charged particle (charge $q$) is moving in a circle of radius $R$ with uniform speed $v.$ The associated magnetic moment $\mu $ is given by
→A person is standing on an open car moving with a constant velocity of $30\,\,m/s$ on a straight horizontal road. The man throws a ball in the vertically upward direction and it returns to the person after the car has moved $240\,\,m.$ The speed and the angle of projection
→The first line in the Lyman series has wavelength $\lambda$. The wavelength of the first line in Balmer series is
→In an $FM$ system a $7\, kHz$ signal modulates $108\, MHz$ carrier so that frequency deviation is $50\, kHz$. The carrier swing is
→A slab is subjected to the two forces ${\vec F_1}$ and ${\vec F_2}$ of same magnitude $F$ as shown in the figure. Force ${\vec F_2}$ is in $XY -$ plane while force $F_1$ acts along $z -$ axis at the point $(2\vec i + 3\vec j)$. The moment of these forces about point $O$ will be
→Two moles of an ideal monoatomic gas occupies a volume $V$ at $27^o C$. The gas expands adiabatically to a volume $2\ V$. Calculate $(a)$ the final temperature of the gas and $(b)$ change in its internal energy.
→The potential energy of a system increases if work is done
Three Carnot engines operate in series between a heat source at a temperature $T_1$ and a heat sink at temperature $T_4$ (see figure). There are two other reservoirs at temperature $T_2$ and $T_3$, as shown, with $T_1 > T_2 > T_3 > T_4$. The three engines are equally efficient if
→The magnifying power of a telescope can be increased by
Faraday is the unit of