| List I | List II | ||
| A. | Troposphere | I. | Approximate 65-75 km over Earth’s surface |
| B. | E- Part of Stratosphere | II. | Approximate 300 km over Earth’s surface |
| C. | F2- Part of Thermosphere | III. | Approximate 10 km over Earth’s surface |
| D. | D- Part of Stratosphere | IV. | Approximate 100 km over Earth’s surface |
For each layer of Earth's atmosphere, the typical altitudes are as follows:
Troposphere: The troposphere extends up to approximately 10 km, so the correct match is \( A \rightarrow III \).
E-Part of Stratosphere: This part of the stratosphere reaches up to about 50 km. Considering the general range, the match is \( B \rightarrow IV \).
F\(_2\)-Part of Thermosphere: The F\(_2\)-layer of the thermosphere can extend as high as 300 km, resulting in the match \( C \rightarrow II \).
D-Part of Stratosphere: The D-part of the stratosphere reaches about 50 km, so the match is \( D \rightarrow I \).
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. The Wien's constant, b = 2.88×106 nm-K. Then,


What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)
In mechanics, the universal force of attraction acting between all matter is known as Gravity, also called gravitation, . It is the weakest known force in nature.
According to Newton’s law of gravitation, “Every particle in the universe attracts every other particle with a force whose magnitude is,
On combining equations (1) and (2) we get,
F ∝ M1M2/r2
F = G × [M1M2]/r2 . . . . (7)
Or, f(r) = GM1M2/r2
The dimension formula of G is [M-1L3T-2].