Question

Match List-I with List-II

List-I	List-II
(A) Hygroscopic water	(I) Number of hydrogen nuclei
(B) Capillary water	(II) Mean monthly temperature
(C) Neutron moisture meter	(III) Adsorption forces
(D) Blaney-Criddle	(IV) Surface tension

Choose the correct answer from the options given below:

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

Hint:

Think about what physically holds each type of water or what variable each method actually senses.

Answer 1

The Correct Option is C

Step 1: Match each item in List-I with the physical cause or method most closely tied to it.

Step 2: Hygroscopic water is the thin film of water held tightly on soil particle surfaces by molecular attraction, so it is governed by adsorption forces. This gives (A) - (III).

Step 3: Capillary water is the water held in the fine pores of the soil against gravity, controlled by surface tension acting at the air water interface inside the pores. This gives (B) - (IV).

Step 4: A neutron moisture meter counts the neutrons slowed down mostly by hydrogen atoms in soil water, so its reading is based on the number of hydrogen nuclei present. This gives (C) - (I).

Step 5: The Blaney-Criddle method estimates evapo-transpiration using the mean monthly temperature along with a crop factor. This gives (D) - (II).

Step 6: Putting these four pairs together, (A) - (III), (B) - (IV), (C) - (I), (D) - (II), which is option 3.