JEE Main 2014 · 19 Apr · Shift 1 · Physics Q1

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PhysicsList match+4 / -1Question 1 of 90

Match List - I (Event) with List - II (Order of the time interval for happening of the event) and select the correct option from the options given below the lists.

List-I

a
Rotation period of earth
b
Revolution period of earth
c
Period of a light wave
d
Period of a sound wave

List-II

i
$10^5$ s
ii
$10^7$ s
iii
$10^{-15}$ s
iv
$10^{-3}$ s

(a) → (i); (b) → (ii); (c) → (iii); (d) → (iv)

(a) → (ii); (b) → (i); (c) → (iv); (d) → (iii)

(a) → (i); (b) → (ii); (c) → (iv); (d) → (iii)

(a) → (ii); (b) → (i); (c) → (iii); (d) → (iv)

Answer and worked solution

Official answer: A

Rotation of the earth, one day: $8.6\times10^4\approx10^5$ s, so (a) → (i).
Revolution, one year: $3.2\times10^7\approx10^7$ s, so (b) → (ii).
Visible light, $f\sim10^{15}$ Hz: period $10^{-15}$ s, so (c) → (iii).
Sound, $f\sim10^3$ Hz: period $10^{-3}$ s, so (d) → (iv).

Topics:SI units and systems of units

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JEE Main 2014 · 19 Apr · Shift 1, Physics question 1