Match List-I with List-II.
| List-I | List-II | ||
|---|---|---|---|
| (A) | Manometer | (I) | Measures very high temperature |
| (B) | Micrometer | (II) | Measures small sub-divisions of a scale |
| (C) | Pyrometer | (III) | Measures the pressure of gases |
| (D) | Vernier | (IV) | Measures distances/angles |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
The name of each instrument tells what it measures: mano- (pressure), micro- (very small), pyro- (fire, heat).
(A) Manometer — this matches (III) Measures the pressure of gases. A U-tube of liquid shows the pressure of a gas as the difference in the liquid levels of its two arms.
(B) Micrometer — this matches (IV) Measures distances/angles. A micrometer (screw gauge) measures very small distances, such as the thickness of a wire, to a hundredth of a millimetre; micrometers fitted to telescopes measure small angles.
(C) Pyrometer — this matches (I) Measures very high temperature. It reads the temperature of furnaces and molten metal from the heat radiation they give out, without touching them.
(D) Vernier — this matches (II) Measures small sub-divisions of a scale. The sliding vernier scale reads fractions of the smallest division of the main scale, as in vernier callipers.