DCOA Mixed Practice Test #360

Question 1

Largest artery:

Accepted Answer

Aorta — Aorta.

Answer

Pulmonary

Answer

Carotid

Answer

Vena cava

Question 2

Self-financing colleges in Kerala:

Accepted Answer

Managed by private — Private unaided colleges.

Answer

Govt

Answer

Co-op

Answer

Unknown

Question 3

A laboratory technician is performing a preliminary screening for the presence of alkaloids in a plant extract. Which of the following reagents is commonly used as a general precipitating reagent for alkaloids, forming characteristic precipitates?

Accepted Answer

C. Mayer's reagent — Mayer's reagent (potassium mercuric iodide) is a widely used general reagent for the detection of alkaloids. It forms a creamy white precipitate with most alkaloids due to the formation of alkaloid-iodide complexes. Benedict's and Fehling's reagents are used for reducing sugars, while Biuret reagent is used for proteins.

Answer

A. Benedict's reagent

Answer

B. Fehling's solution

Answer

D. Biuret reagent

Question 4

Complex [Ni(CN)₄]²⁻ geometry:‌​‍

Accepted Answer

Square planar (dsp² hybridisation, low-spin) — Ni²⁺ is d⁸. ‌​‍Strong field CN⁻ pairs up electrons → square planar. Tetrahedral in [NiCl₄]²⁻ (weak field).

Answer

Linear

Answer

Octahedral

Answer

Tetrahedral

Question 5

G20 Delhi Declaration theme:‌​‍

Accepted Answer

One Earth, One Family, One Future — Vasudhaiva Kutumbakam — 'The World is One Family'.‌​‍

Answer

Make in India

Answer

Digital India

Answer

Skill India

Question 6

In the context of social change in Kerala, the rapid urbanization and migration of youth to cities often lead to specific community health challenges. Which of the following is a direct consequence of such demographic shifts on community health?

Accepted Answer

C. Increased psychosocial stress, lifestyle diseases, and strain on urban health infrastructure. — Rapid urbanization and migration frequently result in increased psychosocial stress due to changing social dynamics, a rise in lifestyle-related non-communicable diseases from sedentary habits and dietary changes, and significant strain on urban health infrastructure. While sanitation might improve in some areas, lifestyle diseases are a major concern. Traditional family support often weakens, and rural primary healthcare can suffer from a lack of trained personnel who migrate to urban centers.

Answer

A. Decreased prevalence of non-communicable diseases due to improved sanitation.

Answer

B. Enhanced traditional family support systems for the elderly and children.

Answer

D. Greater access to primary healthcare services in rural areas due to reduced population density.

Question 7

Porifera are:‌​‍

Accepted Answer

Sponges — Sponges.‌​‍

Answer

Crabs

Answer

Jellyfish

Answer

Worms

Question 8

Amazon Rainforest mainly in:

Accepted Answer

Brazil — Brazil (~60% of the rainforest).

Answer

USA

Answer

Peru

Answer

Colombia

Question 9

Why is the sky blue?‌​‍

Accepted Answer

Scattering of blue light by atmosphere — Rayleigh scattering: shorter wavelength blue light is scattered more by atmospheric molecules.‌​‍

Answer

Reflection from ocean

Answer

Blue gases in air

Answer

Ozone layer

Question 10

Kerala's state animal:‌​‍

Accepted Answer

Elephant — Indian Elephant is Kerala's state animal.‌​‍

Answer

Lion-tailed Macaque

Answer

Nilgiri Tahr

Answer

Tiger

DCOA Mixed Practice Test #360