DCOA Mixed Practice Test #316

Question 1

Recognized as a cornerstone of intellectual awakening and public education in Kerala, which institution holds the distinction of being the first public library established in the state, predating many similar initiatives across India?

Accepted Answer

A. State Central Library, Thiruvananthapuram — The State Central Library in Thiruvananthapuram, also known as the Trivandrum Public Library, was established in 1829. It holds the unique distinction of being the first public library in Kerala and one of the oldest in India, playing a vital role in fostering literacy and intellectual discourse before the establishment of other regional libraries.

Answer

B. Kottayam Public Library

Answer

C. Thrissur Public Library

Answer

D. Ernakulam Public Library

Question 2

A mole of any substance contains how many particles (Avogadro's number)?

Accepted Answer

6.022 × 10²³ — N_A = 6.022 × 10²³ particles/mol (atoms, molecules or ions).

Answer

6.022 × 10²²

Answer

6.022 × 10²⁴

Answer

10⁶

Question 3

Kochi Metro Phase 2:

Accepted Answer

JLN Stadium to Infopark via Kakkanad — Extension Kakkanad-Infopark.

Answer

Edapally to Aluva

Answer

Kakkanad to Tripunithura

Answer

Under construction

Question 4

Nuclear fusion:

Accepted Answer

Joining light atoms — Hydrogen → Helium. Powers the Sun.

Answer

Splitting atoms

Answer

Burning gas

Answer

Chemical reaction

Question 5

An electric heater operating at 230 V draws 2 A current. Its power is:‌​‍

Accepted Answer

460 W — P = VI = 230 × 2 = 460 W.‌​‍

Answer

115 W

Answer

230 W

Answer

1000 W

Question 6

The bond in N₂ molecule is a:‌​‍

Accepted Answer

Triple bond — N≡N has a very strong triple bond (945 kJ/mol).‌​‍

Answer

Double bond

Answer

Single bond

Answer

Ionic bond

Question 7

Which is the lightest gas?‌​‍

Accepted Answer

Hydrogen — Hydrogen is the lightest element and the lightest gas. ‌​‍Helium is the second lightest.

Answer

Oxygen

Answer

Nitrogen

Answer

Helium

Question 8

Lake Michigan is located entirely within which country?‌​‍

Accepted Answer

USA only — Entirely in USA (unique Great Lake).‌​‍

Answer

US-Canada

Answer

Canada

Answer

Mexico

Question 9

The bicarbonate buffer system is the most important extracellular buffer in human blood. Which chemical species primarily constitute this buffer system to maintain pH homeostasis?

Accepted Answer

C. Carbonic acid (H2CO3) and bicarbonate ions (HCO3-) — The bicarbonate buffer system consists of carbonic acid (H2CO3) as the weak acid and its conjugate base, bicarbonate ions (HCO3-). This system effectively neutralizes excess acids and bases, playing a critical role in maintaining blood pH within a narrow physiological range. While other buffer systems exist, the carbonic acid/bicarbonate system is the primary extracellular buffer.

Answer

A. Phosphate ions and proteins

Answer

B. Hemoglobin and plasma proteins

Answer

D. Ammonia and ammonium ions

Question 10

Under the NEP 2020, which body has been proposed to replace the University Grants Commission (UGC) to oversee higher education in India?

Accepted Answer

A. Higher Education Commission of India (HECI) — The NEP 2020 recommends replacing the UGC with the Higher Education Commission of India (HECI) to focus on holistic and multidisciplinary education, reducing administrative burdens. AICTE and NAAC are specialized bodies for technical education and accreditation, respectively, while NCHE is not proposed in the policy.

Answer

B. National Council for Higher Education (NCHE)

Answer

C. All India Council for Technical Education (AICTE)

Answer

D. National Assessment and Accreditation Council (NAAC)

DCOA Mixed Practice Test #316