DCOA Mixed Practice Test #801

Question 1

Russia annexed Crimea in:

Accepted Answer

2014 — Russia annexed Crimea from Ukraine March 2014 after Maidan Revolution in Kyiv. Widely unrecognised internationally.

Answer

1991

Answer

2008

Answer

2022

Question 2

Electronic configuration of Cr (Z=24):‌​‍

Accepted Answer

[Ar] 3d⁵ 4s¹ — Half-filled d (3d⁵) is extra-stable. ‌​‍Cu similarly [Ar] 3d¹⁰ 4s¹ — exception to aufbau.

Answer

[Ar] 3d⁶

Answer

[Ar] 3d⁴ 4s²

Answer

[Ar] 4s² 4p⁴

Question 3

Odd one: Delhi, Mumbai, Kochi, Paris‌​‍

Accepted Answer

Paris — Paris is not in India. Others are Indian cities.‌​‍

Answer

Delhi

Answer

Mumbai

Answer

Kochi

Question 4

Quicklime (CaO) on adding water forms:‌​‍

Accepted Answer

Slaked lime [Ca(OH)₂] — CaO + H₂O → Ca(OH)₂ (exothermic); used in whitewashing.‌​‍

Answer

Gypsum

Answer

Marble

Answer

Limestone

Question 5

Compounds with the same molecular formula but different structures are called:‌​‍

Accepted Answer

Isomers — Isomerism: same formula, different arrangement (structural or stereo).‌​‍

Answer

Isotopes

Answer

Isobars

Answer

Allotropes

Question 6

A patient who was recently diagnosed with a terminal illness insists that their lab results must be wrong and demands a re-test, despite multiple confirmations from the medical team. Which defense mechanism is the patient most likely employing in this situation?

Accepted Answer

C. Denial — Denial is a defense mechanism where an individual refuses to accept a painful reality or fact, often seen in initial reactions to severe diagnoses. Regression involves reverting to an earlier developmental stage, rationalization involves creating logical but false explanations for unacceptable behavior, and projection involves attributing one's own unacceptable thoughts to others.

Answer

A. Regression

Answer

B. Rationalization

Answer

D. Projection

Question 7

A Malayalam teacher wants to assess students' comprehension of a short story in the classroom. Which assessment method would provide the most comprehensive understanding of their learning?

Accepted Answer

B. A written summary followed by a group discussion — A written summary followed by a group discussion (Option B) evaluates both individual understanding (written summary) and collaborative learning (discussion), providing a deeper insight into comprehension. A quiz (A) or fill-in-the-blank (C) tests surface-level knowledge, while a timed reading test (D) may not assess higher-order skills like analysis or interpretation.

Answer

A. A single multiple-choice quiz on the story's plot

Answer

C. A fill-in-the-blank exercise on key vocabulary

Answer

D. A timed reading test with comprehension questions

Question 8

Where were the war criminals of the Second World War put to trial?

Accepted Answer

Nuremberg — The Nuremberg Trials (1945–46) prosecuted major Nazi war criminals.

Answer

Pittsburgh

Answer

Petersburg

Answer

Gettysburg

Question 9

Drift velocity of electrons in a conductor:

Accepted Answer

~10⁻⁴ m/s (very slow) — Despite slow drift, signal propagates near c because all electrons respond together. I = neAvd.

Answer

~10⁸ m/s (speed of light)

Answer

~10⁶

Answer

Zero

Question 10

Ctrl + C is the shortcut for:‌​‍

Accepted Answer

Copy — Ctrl+C = Copy. Ctrl+X = Cut. Ctrl+V = Paste.‌​‍

Answer

Cut

Answer

Close

Answer

Create

DCOA Mixed Practice Test #801