DCOA Mixed Practice Test #73

Question 1

Blood volume in adult:

Accepted Answer

4-5L — About 5 litres.

Answer

2L

Answer

6-7L

Answer

10L

Question 2

Myoglobin in:‌​‍

Accepted Answer

Muscles (stores O2) — Muscle oxygen storage.‌​‍

Answer

Kidney

Answer

Liver

Answer

Blood

Question 3

Elasticity's physical basis is:‌​‍

Accepted Answer

Interatomic forces — Atoms return to equilibrium separation after small deformation. ‌​‍Larger force → plastic deformation or fracture.

Answer

Gravity

Answer

Thermal motion

Answer

Magnetism

Question 4

Chintavishtayaya Sita by:‌​‍

Accepted Answer

Kumaran Asan — Kumaran Asan's famous poem.‌​‍

Answer

Ulloor

Answer

Vallathol

Answer

Changampuzha

Question 5

A new experimental drug is found to bind reversibly to the active site of an enzyme, preventing the substrate from binding. This inhibitory effect can be overcome by significantly increasing the concentration of the natural substrate. What type of enzyme inhibition is this drug exhibiting?

Accepted Answer

C. Competitive inhibition — This describes competitive inhibition, where the inhibitor competes with the substrate for the enzyme's active site. Increasing substrate concentration can outcompete the inhibitor. Non-competitive inhibitors bind to an allosteric site, uncompetitive inhibitors bind only to the enzyme-substrate complex, and irreversible inhibitors form a permanent bond.

Answer

A. Non-competitive inhibition

Answer

B. Uncompetitive inhibition

Answer

D. Irreversible inhibition

Question 6

Zamorin of Calicut ended:‌​‍

Accepted Answer

1792 (Tipu/EIC) — After Anglo-Mysore wars.‌​‍

Answer

1800

Answer

1947

Answer

1857

Question 7

Chandrayaan-3 landed on the Moon in:‌​‍

Accepted Answer

August 2023 — 23 August 2023.‌​‍

Answer

July 2023

Answer

September 2023

Answer

October 2023

Question 8

The Malayali Memorial was submitted to the Maharaja on:‌​‍

Accepted Answer

1 January 1891 — Malayali Memorial (1 January 1891) demanded adequate representation of Malayalis in government jobs.‌​‍

Answer

26 July 1859

Answer

11 January 1809

Answer

3 September 1896

Question 9

Which pair of acids forms 'aqua regia' that dissolves gold?‌​‍

Accepted Answer

Hydrochloric and Nitric — Aqua Regia = 3 parts HCl + 1 part HNO₃ (concentrated).‌​‍

Answer

Nitric and Sulphuric

Answer

Sulphuric and Carbonic

Answer

Hydrochloric and Sulphuric

Question 10

Which of the following data collection methods is least suitable for a teacher conducting action research focused on improving students' classroom behavior?

Accepted Answer

D. A single, end-of-year standardized psychological assessment administered by an external expert. — Action research emphasizes ongoing, practical, and context-specific data collection that can inform immediate adjustments. Options A, B, and C are all suitable as they provide direct, formative insights into classroom behavior from various perspectives. Option D, a single, external, standardized assessment, is less suitable because it is often summative, not immediate, and less integrated into the teacher's ongoing reflective practice.

Answer

A. Teacher observation checklists and anecdotal records.

Answer

B. Student self-assessment rubrics for behavior.

Answer

C. Peer observation and feedback on student interactions.

DCOA Mixed Practice Test #73