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Multiple Choice Question with Only One Choice Correct
Which one of the following statements is not true about thermal radiations?
(a) All bodies emit thermal radiations at all temperatures
(b) Thermal radiations are electromagnetic waves
(c) Thermal radiations are not reflected from a mirror
(d) Thermal radiations travel in free space with a velocity of 3 x 10⁸ ms^-1

Chemistry

Multiple Chioce Question
Phenol is less acidic than

(a)

acetic acid

(b)

p-methoxyphenol

(c)

p-nitrophenol

(d)

ethanol

Mathematics

Passage Based Question
Passage I
If m, n, r

N, then
^mC₀ ⁿC_r + ^mC₁ ⁿC_{r - 1} + ..... + ^mC_r ⁿC₀
= coefficient of x^r in (1 + x)^m (1 + x)ⁿ
= coefficient of x^r in (1 + x)^{m + n}
= ^{m + n}C_r
We can use similar techniques to evaluate product of binomial coefficients.
The value of r for which
S = ²⁰C_r ¹⁰C₀ + ²⁰C_{r - 1} ¹⁰C₁ .....+ ²⁰C₀ ¹⁰C_r is maximum is