DCOA Mixed Practice Test #758

Question 1

Who led the 1921 Malabar Rebellion?‌​‍

Accepted Answer

Ali Musliyar — Ali Musliyar and Variyankunnath Kunhahammad Haji led the 1921 Moplah uprising.‌​‍

Answer

Syed Fazal Pookoya Thangal

Answer

Mamburam Thangal

Answer

E.K. Aboobacker Musliyar

Question 2

Bacteria fall in:‌​‍

Accepted Answer

Monera — Prokaryotes in Monera.‌​‍

Answer

Plantae

Answer

Fungi

Answer

Protista

Question 3

Ageostationary satellite orbits Earth once every:‌​‍

Accepted Answer

24 hours — Geostationary satellites orbit at 35,786 km above equator, matching Earth's rotation.‌​‍

Answer

1 hour

Answer

1 week

Answer

12 hours

Question 4

Which of the following hormones is secreted by the posterior pituitary gland?

Accepted Answer

C. Oxytocin — Oxytocin is stored and secreted by the posterior pituitary gland, whereas growth hormone, prolactin, and ACTH are secreted by the anterior pituitary.

Answer

A. Growth hormone

Answer

B. Prolactin

Answer

D. Adrenocorticotropic hormone

Question 5

Sum of interior angles of a hexagon is:

Accepted Answer

720° — (6−2)×180 = 720°.

Answer

540°

Answer

900°

Answer

1080°

Question 6

Before initiating a research study involving human subjects, what is the primary purpose of obtaining informed consent from participants?

Accepted Answer

C. To ensure participants understand the study's purpose, risks, benefits, and their right to withdraw. — Informed consent is a fundamental ethical principle in research, ensuring that participants voluntarily agree to participate after fully understanding the study's nature, potential risks, benefits, and their rights, including the right to withdraw at any time without penalty. It upholds autonomy and protects participant welfare, not just researcher liability or data publication.

Answer

A. To ensure participants will complete the entire study duration.

Answer

B. To protect the researcher from legal liability.

Answer

D. To obtain a written agreement for publishing their personal data.

Question 7

India's net zero target year:‌​‍

Accepted Answer

2070 — PM Modi announced net zero emissions by 2070 at COP26.‌​‍

Answer

2050

Answer

2060

Answer

2080

Question 8

ΔH_fus for ice at 0°C:

Accepted Answer

+6.01 kJ/mol — Endothermic. ΔH_vap of water at 100°C = +40.7 kJ/mol. Much larger — hydrogen bonds more disrupted.

Answer

+40.7 kJ/mol

Answer

-6.01

Answer

0

Question 9

Which structural feature is essential for the antibacterial activity of sulfonamides, acting as a para-aminobenzoic acid (PABA) analog?

Accepted Answer

A. The presence of a primary amino group (-NH2) at the para position to the sulfonyl group. — Sulfonamides exert their antibacterial effect by mimicking PABA, which is a substrate for bacterial dihydropteroate synthase. The primary amino group at the para position to the sulfonyl group is crucial for this competitive inhibition, blocking bacterial folic acid synthesis. Other modifications would typically reduce or abolish activity.

Answer

B. A secondary amino group (-NHR) at the meta position to the sulfonyl group.

Answer

C. A carboxylic acid group (-COOH) attached to the benzene ring.

Answer

D. An alkyl group attached to the sulfonyl nitrogen.

Question 10

Reserpine, an indole alkaloid isolated from Rauwolfia serpentina, exerts its pharmacological effect primarily by:

Accepted Answer

C. Depleting catecholamine and serotonin stores in presynaptic neurons. — Reserpine acts by irreversibly binding to the vesicular monoamine transporter (VMAT), preventing the uptake and storage of neurotransmitters like norepinephrine, dopamine, and serotonin into synaptic vesicles. This depletion of neurotransmitter stores leads to its antihypertensive and sedative effects.

Answer

A. Directly stimulating adrenergic receptors, leading to vasoconstriction.

Answer

B. Inhibiting the reuptake of norepinephrine, serotonin, and dopamine.

Answer

D. Acting as a competitive antagonist at muscarinic acetylcholine receptors.

DCOA Mixed Practice Test #758