VFA Mixed Practice Test #160

Question 1

Resonance results in:‌​‍

Accepted Answer

Delocalisation of electrons; hybrid structure more stable — Benzene: resonance hybrid of two Kekulé structures. ‌​‍Carbonate ion: three equivalent resonance forms.

Answer

Only one structure

Answer

Isomers

Answer

Different compounds

Question 2

Typical embryo sac is:‌​‍

Accepted Answer

Monosporic, 8-nucleate, 7-celled — Polygonum type. ‌​‍3 antipodal + 2 synergids + 1 egg + 1 central cell (with 2 polar nuclei). Megaspore mother cell → 4 megaspores; 1 survives.

Answer

Bisporic

Answer

Zygotic

Answer

Tetrasporic

Question 3

The Ottoman Empire captured Constantinople in:‌​‍

Accepted Answer

1453 — Sultan Mehmed II captured Constantinople 29 May 1453, ending Byzantine Empire. ‌​‍Renamed Istanbul. Ottoman Empire lasted till 1923 (formation of Turkish Republic under Atatürk).

Answer

1923

Answer

1683

Answer

1204

Question 4

Mitosis produces:‌​‍

Accepted Answer

2 identical diploid daughter cells — Growth, repair. Prophase, metaphase, anaphase, telophase. Cytokinesis follows.‌​‍

Answer

2 haploid

Answer

Gametes

Answer

4 haploid cells

Question 5

Kerala's Haritha Keralam Mission focuses on:‌​‍

Accepted Answer

Waste management and organic farming — Haritha Keralam Mission focuses on waste management, organic farming, and water resource management.‌​‍

Answer

Industrial growth

Answer

Tourism promotion

Answer

IT development

Question 6

O.N.V. Kurup's literary position:

Accepted Answer

Poet — Renowned Malayalam poet.

Answer

Novelist

Answer

Painter

Answer

Playwright

Question 7

A concave mirror is used in:‌​‍

Accepted Answer

Headlights and solar cookers — Concave mirrors converge light; used in torches, headlights, solar cookers.‌​‍

Answer

Sunglasses

Answer

Rear-view mirrors

Answer

Periscopes

Question 8

Ether on cleavage with HI:‌​‍

Accepted Answer

Gives alkyl iodide and alcohol/phenol — R-O-R' + HI → RI + R'OH. Which bond cleaves depends on mechanism (1°/2°/3°).‌​‍

Answer

No reaction

Answer

Only HI

Answer

Gives two alcohols

Question 9

Aspirin (acetylsalicylic acid) is known to undergo hydrolysis, especially in the presence of moisture and heat. Which of the following products is formed when aspirin undergoes complete hydrolysis?

Accepted Answer

A. Salicylic acid and acetic acid — Aspirin is an ester of salicylic acid and acetic acid. Upon hydrolysis, the ester bond breaks, regenerating the parent carboxylic acid (salicylic acid) and acetic acid. This reaction is responsible for the characteristic vinegar-like smell of old aspirin and is a key degradation pathway.

Answer

B. Acetylsalicylic acid and ethanol

Answer

C. Phenol and benzoic acid

Answer

D. Salicylamide and methanol

Question 10

Tranquilisers are used for:‌​‍

Accepted Answer

Anxiety, mental agitation (e.g., Valium, equanil) — Sedatives for stress. ‌​‍Barbiturates are older class. Benzodiazepines (valium) safer.

Answer

Heart

Answer

Infection

Answer

Pain relief

VFA Mixed Practice Test #160