Match List-I with List-II.
| List-I | List-II | ||
|---|---|---|---|
| (Quantity) | (Unit) | ||
| (A) | Acceleration | (I) | newton-metre-2 |
| (B) | Pressure | (II) | metre-1 |
| (C) | Power of lens | (III) | second-1 |
| (D) | Frequency | (IV) | metre-second-2 |
Choose the most appropriate answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
The unit of a quantity follows from the formula that defines it.
(A) Acceleration — this matches (IV) metre-second-2. Acceleration is the change of velocity (m s-1) per second, so its unit is m s-2.
(B) Pressure — this matches (I) newton-metre-2. Pressure is force per unit area, so its unit is N m-2, also called the pascal.
(C) Power of lens — this matches (II) metre-1. The power of a lens is the reciprocal of its focal length in metres; its unit m-1 is called the dioptre.
(D) Frequency — this matches (III) second-1. Frequency is the number of vibrations per second, so its unit is s-1, the hertz.