DCOA Mixed Practice Test #661

Question 1

Buffer solution:

Accepted Answer

Resists change in pH on small addition of acid/base — Weak acid + its conjugate base (or vice versa). Henderson-Hasselbalch: pH = pKa + log([A⁻]/[HA]).

Answer

No pH change

Answer

Only acidic

Answer

Only neutral

Question 2

Zamorin full title:‌​‍

Accepted Answer

Samoothiri — Samoothiri Raja.‌​‍

Answer

Perumal

Answer

Thirumulpad

Answer

Raja

Question 3

Which is the largest biosphere reserve in India?‌​‍

Accepted Answer

Gulf of Mannar — Gulf of Mannar — 10,500 sq km.‌​‍

Answer

Sundarban

Answer

Nilgiri

Answer

Nanda Devi

Question 4

The capital of Kenya is:‌​‍

Accepted Answer

Nairobi — Nairobi is Kenya's capital and largest city.‌​‍

Answer

Amman

Answer

Beirut

Answer

Cairo

Question 5

Ribosomes are composed of:

Accepted Answer

rRNA and protein — Ribosomes have a large and small subunit made of rRNA and many proteins.

Answer

DNA and protein

Answer

mRNA only

Answer

Lipids

Question 6

Biden withdrawal 2024:‌​‍

Accepted Answer

July 2024 — Dropped out July 2024.‌​‍

Answer

January

Answer

October

Answer

Never

Question 7

Aluminum hydroxide is a commonly used antacid. Which of the following statements accurately describes its action and a potential side effect?

Accepted Answer

B. It is a non-systemic antacid and can cause constipation. — Aluminum hydroxide is a non-systemic antacid, meaning it is poorly absorbed from the gastrointestinal tract and primarily acts locally to neutralize stomach acid. A common side effect associated with aluminum-containing antacids is constipation due to their astringent properties. Systemic antacids like sodium bicarbonate can cause metabolic alkalosis.

Answer

A. It is a systemic antacid and can cause diarrhea.

Answer

C. It acts by inhibiting proton pump activity and can cause diarrhea.

Answer

D. It is a systemic antacid and can cause metabolic alkalosis.

Question 8

Resistance unit:‌​‍

Accepted Answer

Ohm — Named after Georg Ohm.‌​‍

Answer

Volt

Answer

Ampere

Answer

Watt

Question 9

Symbol of Sodium:

Accepted Answer

Na — Na (Natrium).

Answer

So

Answer

Sd

Answer

S

Question 10

Kerala Kalamandalam was founded by:‌​‍

Accepted Answer

Vallathol Narayana Menon — Poet Vallathol Narayana Menon founded Kerala Kalamandalam in 1930 to promote Kerala's classical arts.‌​‍

Answer

E. M. S. Namboodiripad

Answer

K. Kelappan

Answer

K. V. Krishna Menon

DCOA Mixed Practice Test #661