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Convection

Statement-1If...

Question

Statement-1
If the earth did not have an atmosphere, it would become extremely cold.
Statement-2
Heat energy is transferred through air mainly by convection.

Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement- 1

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Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1

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Statement-1 is true, Statement-2 is false.

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Statement-1 is false, Statement-2 is true.

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Solution

The correct option is D Statement-1 is true, Statement-2 is false.
Thermal radiation from the sun warm the earth during day time. Since air is poor conductor of heat,the atmosphere act as a blanket for the earth and keeps it warm during night time.
Therefore, correct answer is C.

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0 < x < y \Rightarrow {log}_{a} x > {log}_{a} y

a > 1

- 2 :

a > 1, {log}_{a} x

\sum_{r = 0}^{n} (r + 1)^{n} C_{r} = (n + 2) 2^{n - 1} .

\sum_{r = 0}^{n} (r + 1)^{n} C_{r} x^{r} = (1 + x)^{n} + n x (1 + x)^{n - 1} .

\sum_{r = 0}^{n} (r + 1)^{n} C_{r} = (n + 2) 2^{n - 1} .

\sum_{r = 0}^{n} (r + 1)^{n} C_{r} x^{r} = (1 + x)^{n} + n x (1 + x)^{n - 1} .

I

\to L = I \to ω

II

\to τ = \frac{d \to L}{d t}

n \geq 2,

\frac{1}{\sqrt{1}} + \frac{1}{\sqrt{2}} + . . . + \frac{1}{\sqrt{n}} > \sqrt{n}

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