DCOA Mixed Practice Test #668

Question 1

Unit of pressure:‌​‍

Accepted Answer

Pascal — Pascal (Pa) = N/m².‌​‍

Answer

Joule

Answer

Bar

Answer

Newton

Question 2

Aral Sea shrinking due to:

Accepted Answer

Both — Both irrigation + climate.

Answer

Irrigation diversion Soviet era

Answer

Climate

Answer

Natural

Question 3

The Intergovernmental Panel on Climate Change (IPCC) plays a crucial role in informing global climate policy. Which of the following best describes the IPCC's primary contribution to the United Nations Framework Convention on Climate Change (UNFCCC) negotiations?

Accepted Answer

C. Providing comprehensive scientific assessments of climate change and its impacts to inform policy decisions. — The IPCC is an assessment body that synthesizes existing scientific literature from thousands of scientists worldwide, not a body that conducts original research or enforces policies. Its primary role is to provide policymakers with regular, comprehensive scientific assessments on climate change, its implications, and future risks, as well as to put forward adaptation and mitigation options, thereby informing policy decisions like those made under the UNFCCC.

Answer

A. Directing member states on specific mitigation technologies to adopt.

Answer

B. Conducting original scientific research to discover new climate phenomena.

Answer

D. Enforcing compliance with emission reduction targets set by international agreements.

Question 4

Kerala's financial capital:‌​‍

Accepted Answer

Kochi (Ernakulam) — Kochi — commercial hub.‌​‍

Answer

Thiruvananthapuram

Answer

Thrissur

Answer

Kozhikode

Question 5

The Rowlatt Act was passed in:‌​‍

Accepted Answer

1919 — The Rowlatt Act (1919) allowed detention without trial. ‌​‍Gandhi called it a 'Black Act'.

Answer

1917

Answer

1920

Answer

1922

Question 6

What is the fundamental functional unit of the kidney, responsible for filtering blood, reabsorbing essential substances, and excreting waste products to form urine?

Accepted Answer

B. Nephron — The nephron is the microscopic structural and functional unit of the kidney, performing the crucial tasks of blood filtration, selective reabsorption of vital nutrients, and secretion of waste, ultimately leading to urine formation. The ureter transports urine, the glomerulus is part of the nephron, and the renal pelvis collects urine.

Answer

A. Ureter

Answer

C. Glomerulus

Answer

D. Renal pelvis

Question 7

Which lipoprotein is primarily responsible for transporting cholesterol from peripheral tissues back to the liver, a process crucial for preventing atherosclerosis?

Accepted Answer

A. High-Density Lipoprotein (HDL) — High-Density Lipoprotein (HDL) is often referred to as 'good cholesterol' because its primary function is reverse cholesterol transport, meaning it removes cholesterol from peripheral cells and transports it back to the liver for excretion or recycling. Low-Density Lipoprotein (LDL) delivers cholesterol to cells, and high levels contribute to plaque formation. VLDL transports triglycerides from the liver, and chylomicrons transport dietary fats.

Answer

B. Low-Density Lipoprotein (LDL)

Answer

C. Very Low-Density Lipoprotein (VLDL)

Answer

D. Chylomicrons

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

Formic acid (HCOOH) is found naturally in:‌​‍

Accepted Answer

Ant bites — Formic acid (methanoic acid) is the simplest carboxylic acid; produced by ants and bee stings.‌​‍

Answer

Lemon

Answer

Battery

Answer

Vinegar

Question 10

Kashi Vishwanath Corridor:‌​‍

Accepted Answer

2021 inauguration — 13 Dec 2021.‌​‍

Answer

2024

Answer

2019

Answer

2023

DCOA Mixed Practice Test #668