Question

Match List-I with List-II.

List-I (Metal)	List-II (Application)
(A) Cs	(I) High temperature thermometer
(B) Ga	(II) Water repellent sprays
(C) B	(III) Photoelectric cells
(D) Si	(IV) Bullet proof vest

Choose the most appropriate answer from the options given below:

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

Answer 1

The Correct Option is A

 To solve this question, we need to match metals in List-I with their respective applications in List-II. Let's go through each metal and its common usage:

1. Caesium (Cs): It is commonly used in photoelectric cells because of its ability to easily emit electrons when exposed to light. Hence, Cs matches with (III) Photoelectric cells.
2. Gallium (Ga): Gallium has a low melting point and can be used in high-temperature thermometers because it remains in liquid form over a wide range of temperatures. Thus, Ga matches with (I) High temperature thermometer.
3. Boron (B): Boron fibers are used in bulletproof vests due to their lightweight and high strength properties. Hence, B matches with (IV) Bullet proof vest.
4. Silicon (Si): Silicon is used in various industrial applications, including water-repellent sprays due to its ability to form water-repelling surfaces. Therefore, Si matches with (II) Water repellent sprays.

Now, let's compare our matches with the given options:

Option	Matches
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)	Cs-Photoelectric cells, Ga-High temperature thermometer, B-Bullet proof vest, Si-Water repellent sprays
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)	Cs-Bullet proof vest, Ga-Photoelectric cells, B-Water repellent sprays, Si-High temperature thermometer
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)	Cs-Water repellent sprays, Ga-Photoelectric cells, B-Bullet proof vest, Si-High temperature thermometer
(A)-(I), (B)-(IV), (C)-(II), (D)-(III)	Cs-High temperature thermometer, Ga-Bullet proof vest, B-Water repellent sprays, Si-Photoelectric cells

The correct matches according to our analysis are: (A)-(III), (B)-(I), (C)-(IV), (D)-(II). This corresponds to the first option provided above.

Hence, the correct answer is:

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