DCOA Mixed Practice Test #558

Question 1

Largest country by area:‌​‍

Accepted Answer

Russia — Russia — 17.1 million sq km.‌​‍

Answer

Canada

Answer

USA

Answer

China

Question 2

Which of the following is the PRIMARY reason for using a desiccant in the packaging of effervescent tablets?

Accepted Answer

B. To absorb moisture and maintain stability — Effervescent tablets are highly hygroscopic and can degrade if exposed to moisture. A desiccant absorbs moisture, preserving the tablet's stability. Option A is incorrect as desiccants do not primarily prevent microbial contamination. Options C and D are unrelated to the function of a desiccant.

Answer

A. To prevent microbial contamination

Answer

C. To enhance the dissolution rate of the tablet

Answer

D. To improve the tablet's hardness

Question 3

Vagbhatanandan, the Kerala reformer, established which organisation?‌​‍

Accepted Answer

Atmavidya Sangham — Vagbhatanandan founded the Atmavidya Sangham to spread rationalist reform among the Thiyyas of North Kerala.‌​‍

Answer

Nair Service Society

Answer

Yogakshema Sabha

Answer

Sree Narayana Dharma Paripalana Yogam

Question 4

A mutation is:‌​‍

Accepted Answer

A heritable change in DNA sequence — Mutations are changes in DNA passed to daughter cells/offspring.‌​‍

Answer

Any body movement

Answer

Viral infection

Answer

Cell death

Question 5

Which of the following Himalayan ranges is primarily known for its 'Duns' and 'Duars' valleys, formed by the deposition of unconsolidated sediments brought by the rivers flowing from the northern ranges?

Accepted Answer

C. Shiwaliks — The Shiwaliks, also known as the Outer Himalayas, are the southernmost and youngest range of the Himalayas. They are primarily formed by the deposition of unconsolidated sediments brought down by the rivers from the main Himalayan ranges. These unconsolidated sediments lead to the formation of longitudinal valleys called 'Duns' in the west (e.g., Dehradun) and 'Duars' in the east. The Greater Himalayas are known for high peaks, the Lesser Himalayas for hill stations, and the Trans-Himalayas for arid, high-altitude ranges.

Answer

A. Greater Himalayas

Answer

B. Lesser Himalayas

Answer

D. Trans-Himalayas

Question 6

Ethene (ethylene) has the formula:‌​‍

Accepted Answer

C₂H₄ — Ethene = C₂H₄; used in polymerisation (polyethylene) and ripening fruits.‌​‍

Answer

CH₄

Answer

C₂H₂

Answer

C₂H₆

Question 7

Infosys CEO:‌​‍

Accepted Answer

Salil Parekh — Salil Parekh.‌​‍

Answer

Narayana

Answer

Sikka

Answer

Sundar

Question 8

Wetland of international importance — India:‌​‍

Accepted Answer

Chilika Lake, Keoladeo, Sundarbans, Wular, Vembanad, etc. (Ramsar sites) — India has 75+ Ramsar sites. ‌​‍Chilika largest brackish lake in Asia. Keoladeo Ghana (Bharatpur) famous bird sanctuary.

Answer

Only coast

Answer

Just rivers

Answer

Kerala backwaters

Question 9

Largest circulation Malayalam daily:‌​‍

Accepted Answer

Malayala Manorama — Malayala Manorama.‌​‍

Answer

Madhyamam

Answer

Mathrubhumi

Answer

Deshabhimani

Question 10

Mole fraction of solute in a solution with 2 mol solute and 8 mol solvent:‌​‍

Accepted Answer

0.2 — x_solute = n_solute/(n_solute + n_solvent) = 2/10 = 0.2. Sum x_i = 1.‌​‍

Answer

0.8

Answer

0.1

Answer

0.25

DCOA Mixed Practice Test #558