MPSC Rajyaseva Prelims Answer Key 2025

66. Which of the following medicine can be classified as both Analgesics and Antipyretics?

A. Veronal

B. Benadryl

C. Penicillin

D. Paracetamol

(1) Only A

(2) Both A and D

(3) Both B and C

(4) Only D

Answer: (4) Only D

67. Match the correct pairs:

A. Monosaccharide → i. Raffinose

B. Disaccharide → ii. Starch

C. Trisaccharide → iii. Glucose

D. Polysaccharide → iv. Sucrose

(1) A-iii, B-ii, C-i, D-iv

(2) A-ii, B-i, C-iii, D-iv

(3) A-iv, B-iii, C-ii, D-i

(4) A-iii, B-iv, C-i, D-ii

Answer: (4)

68. The isotopes of hydrogen and their respective mass ratio are _______.

(1) Deuterium, Protium, Tritium ; 1 : 2 : 3

(2) Tritium, Deuterium, Protium ; 2 : 3 : 1

(3) Tritium, Protium, Deuterium ; 2 : 3 : 1

(4) Protium, Deuterium, Tritium ; 1 : 2 : 3

Answer: (4)

(Mass: Protium=1, Deuterium=2, Tritium=3)

69. Which of the following options does not involve use of carbon in any form for energy production?

A. Wood

B. Biogas

C. Geothermal source

D. Coal

(1) Both A and B

(2) Both B and C

(3) Only C

(4) Only D

Answer: (3) Only C

70. Which chemical bond is formed between Mg and Cl atoms during formation of compound MgCl₂?

a. Covalent bond

b. Ionic bond

c. Coordinate covalent bond

d. Metallic bond

(1) Only d

(2) Only a

(3) Only a and c

(4) Only b

Answer: (4) Only b