DCOA Mixed Practice Test #116

Question 1

Which of the following physiological changes is most directly responsible for the increased risk of postural hypotension in elderly patients due to autonomic neuropathy?

Accepted Answer

A. Decreased baroreceptor sensitivity leading to impaired heart rate response to blood pressure changes — Postural hypotension in elderly patients with autonomic neuropathy is primarily due to impaired baroreceptor reflexes, which fail to appropriately adjust heart rate and vascular tone in response to changes in posture. While arteriosclerosis (B) contributes to vascular stiffness, it does not directly cause the autonomic dysfunction. Left ventricular hypertrophy (C) and reduced renin-angiotensin-aldosterone activity (D) are less directly linked to the acute drop in blood pressure upon standing.

Answer

B. Increased peripheral vascular resistance due to arteriosclerosis

Answer

C. Reduced cardiac output secondary to left ventricular hypertrophy

Answer

D. Decreased plasma renin and aldosterone levels leading to sodium and water retention

Question 2

GUI refers to:

Accepted Answer

Graphical User Interface — GUI = Graphical User Interface.

Answer

Guaranteed User Interface

Answer

Graphics Utilized Internally

Answer

None of the above

Question 3

Chemical formula of salt (common):‌​‍

Accepted Answer

NaCl — NaCl — sodium chloride.‌​‍

Answer

MgCl₂

Answer

CaCl₂

Answer

KCl

Question 4

The Ostwald process manufactures:‌​‍

Accepted Answer

Nitric acid — Ostwald: NH₃ → NO → NO₂ → HNO₃ using Pt catalyst.‌​‍

Answer

Ammonia

Answer

Sulphuric acid

Answer

Hydrochloric acid

Question 5

The Versailles Palace was the residence of:‌​‍

Accepted Answer

The Bourbon kings of France — Built by Louis XIV, Versailles became the seat of Bourbon kings until 1789.‌​‍

Answer

The Holy Roman Emperor

Answer

The Tudor dynasty

Answer

The Spanish Habsburgs

Question 6

Porifera (sponges) are:‌​‍

Accepted Answer

Acoelomate, no tissues, have ostia/osculum — Water canal system, spicules/spongin skeleton. ‌​‍Choanocytes (collar cells). Simplest animals. ‌​‍e.g. Spongilla, Euspongia.

Answer

Coelomate

Answer

Vertebrates

Answer

Triploblastic

Question 7

What did the Miller-Urey experiment (1953) demonstrate?‌​‍

Accepted Answer

Abiotic synthesis of amino acids from inorganic gases — NH₃, CH₄, H₂, H₂O + spark → amino acids. ‌​‍Supports Oparin-Haldane hypothesis of chemical evolution.

Answer

Antibiotics

Answer

DNA structure

Answer

Cloning

Question 8

Cambium function:‌​‍

Accepted Answer

Secondary growth — Lateral meristem — secondary thickening.‌​‍

Answer

Primary

Answer

Roots

Answer

Leaves

Question 9

In the context of NEP 2020, what does the term '360-degree progress card' refer to?

Accepted Answer

B. A holistic evaluation including co-curricular activities and life skills — NEP 2020 proposes a 360-degree progress card to evaluate students holistically, including academic, co-curricular, and life skills. Options A, C, and D are incorrect as they narrow the scope to specific areas or tools.

Answer

A. A report card assessing only academic performance

Answer

C. A digital platform for tracking student attendance

Answer

D. A standardized test for teacher performance

Question 10

Alexander Fleming discovered:‌​‍

Accepted Answer

Penicillin — Penicillin (1928).‌​‍

Answer

Vaccine

Answer

X-ray

Answer

DNA

DCOA Mixed Practice Test #116