Question

Match List-I with List-II.

List-I		List-II
Instrument		Parameter measurement
(A)	Gypsum blocks	(I)	Water flow
(B)	Flume	(II)	Soil moisture suction
(C)	Infra-red balance	(III)	Di-electric constant
(D)	Irrometer	(IV)	Electric resistance
(E)	TDR	(V)	Gravimetric moisture content

Choose the correct answer from the options given below.

• (A) - (IV), (B) - (III), (C) - (II), (D) - (V), (E) - (I)
• (A) - (IV), (B) - (III), (C) - (I), (D) - (II), (E) - (V)
• (A) - (I), (B) - (V), (C) - (IV), (D) - (II), (E) - (III)
• (A) - (IV), (B) - (I), (C) - (V), (D) - (II), (E) - (III)

Hint:

Think about the physical quantity each instrument's reading actually comes from, resistance, flow depth, weight loss, suction, or pulse timing.

Answer 1

The Correct Option is D

The cleanest way to solve a match-the-list question like this is to fix each instrument's true working principle first, then look for its pair.

1. Gypsum blocks: work by measuring electric resistance between two electrodes buried in a gypsum block, so they pair with Electric resistance (IV).
2. Flume: is a channel shape used to gauge the rate of water flowing through it, so it pairs with Water flow (I).
3. Infra-red balance: quickly dries a soil sample with infra-red heat while weighing it, giving the classic weight-loss-on-drying figure, so it pairs with Gravimetric moisture content (V).
4. Irrometer: is simply the branded name for a tensiometer, and tensiometers read soil moisture suction, so it pairs with Soil moisture suction (II).
5. TDR: times an electrical pulse to find the soil's dielectric constant, so it pairs with Di-electric constant (III).

Lining these five pairs up gives (A)-(IV), (B)-(I), (C)-(V), (D)-(II), (E)-(III).

Let's summarize:

• Gypsum blocks and TDR both give an electrical reading, resistance for one, dielectric constant for the other, so do not mix them up.
• The flume measures flow rate, the irrometer measures suction, and the infra-red balance gives gravimetric moisture content by direct weighing.

This full set of pairs matches option 4.