DCOA Mixed Practice Test #6

Question 1

Which type of bone cell is primarily responsible for breaking down bone tissue, a process essential for bone remodeling and calcium homeostasis?

Accepted Answer

C. Osteoclast — Osteoclasts are large, multinucleated cells that secrete acids and enzymes to resorb, or break down, bone tissue, releasing minerals into the blood. This process is crucial for bone remodeling, repair, and maintaining calcium homeostasis. Osteoblasts are responsible for bone formation, osteocytes maintain bone tissue, and chondrocytes are cells found in cartilage.

Answer

A. Osteoblast

Answer

B. Osteocyte

Answer

D. Chondrocyte

Question 2

Fungi differ from plants in that fungi lack:‌​‍

Accepted Answer

Chlorophyll — Fungi have no chlorophyll → cannot photosynthesise; they are heterotrophic.‌​‍

Answer

Nucleus

Answer

Cytoplasm

Answer

Cell wall

Question 3

AIDS is caused by:

Accepted Answer

HIV — HIV (Human Immunodeficiency Virus) attacks CD4+ T-cells, causing AIDS.

Answer

HBV

Answer

HPV

Answer

HCV

Question 4

Which is the largest animal phylum?‌​‍

Accepted Answer

Arthropoda — ~75% of animal species. ‌​‍Jointed legs, exoskeleton of chitin. Insects, crustaceans, arachnids.

Answer

Mollusca

Answer

Annelida

Answer

Chordata

Question 5

Study of teeth:

Accepted Answer

Both — Both terms used.

Answer

Odontology

Answer

Dentistry

Answer

Periodontology

Question 6

Which of the following is a primary function of insoluble dietary fiber in the human body?

Accepted Answer

B. Adding bulk to stool and promoting bowel regularity. — Insoluble fiber's main role is to add bulk to the stool, which helps to stimulate bowel movements and prevent constipation. While soluble fiber can help lower cholesterol, insoluble fiber primarily contributes to gut motility and regularity. Fiber itself does not provide significant vitamins, minerals, or assist in fat-soluble vitamin absorption.

Answer

A. Lowering blood cholesterol levels.

Answer

C. Providing a significant source of vitamins and minerals.

Answer

D. Assisting in the absorption of fat-soluble vitamins.

Question 7

Vallam Kali (boat race) held on:‌​‍

Accepted Answer

Punnamada Lake — Nehru Trophy Boat Race held on Punnamada Lake, Alappuzha.‌​‍

Answer

Vembanad Lake

Answer

Pamba River

Answer

Periyar River

Question 8

Technetium-99m (Tc-99m) is widely used in diagnostic imaging due to its ideal physical properties. Which of the following is NOT a characteristic contributing to its suitability?

Accepted Answer

D. Emission of alpha particles — Tc-99m is ideal for diagnostic imaging because it has a short half-life (6 hours), emits gamma rays (which can be detected externally), and results in a low patient radiation dose. Alpha particles are highly energetic and would deliver a high, localized radiation dose, making them unsuitable for diagnostic imaging.

Answer

A. Short half-life

Answer

B. Emission of gamma rays

Answer

C. Low patient radiation dose

Question 9

Aditya-L1 launched:‌​‍

Accepted Answer

Sep 2023 — 2 September 2023 — India's first solar mission.‌​‍

Answer

Dec 2023

Answer

Nov 2023

Answer

Oct 2023

Question 10

Which of the following is a limitation of using ICT in rural educational settings in Kerala?

Accepted Answer

D. Limited access to reliable electricity and internet — Limited access to reliable electricity and internet is a significant limitation of using ICT in rural educational settings in Kerala. While high initial costs, lack of teacher training, and over-reliance on traditional methods are also challenges, unreliable infrastructure is a more immediate and widespread issue in rural areas.

Answer

A. High initial cost of infrastructure

Answer

B. Over-reliance on traditional teaching methods

Answer

C. Lack of teacher training in ICT

DCOA Mixed Practice Test #6