DCOA Mixed Practice Test #459

Question 1

'War and Peace' was written by:

Accepted Answer

Leo Tolstoy — Tolstoy's epic novel War and Peace (1869) depicts Russian society during Napoleon's invasion.

Answer

Dostoevsky

Answer

Chekhov

Answer

Pushkin

Question 2

In the context of cardiac glycosides like Digoxin, which structural component is directly responsible for their cardiotonic activity and pharmacological effect on the heart muscle?

Accepted Answer

B. The steroid nucleus (aglycone/genin) — The pharmacological activity of cardiac glycosides, such as Digoxin, resides primarily in the aglycone (or genin) part, which is a steroid nucleus with an unsaturated lactone ring. The sugar moiety (glycone) primarily influences the pharmacokinetic properties like absorption and solubility, but not the direct cardiotonic action.

Answer

A. The sugar moiety (glycone)

Answer

C. The ester linkage

Answer

D. The hydroxyl groups on the sugar

Question 3

5m South, 5m East, 5m North. Displacement:‌​‍

Accepted Answer

5m East — Ends 5m East of start.‌​‍

Answer

10m

Answer

5m North

Answer

0

Question 4

How many terms did Oommen Chandy serve as Chief Minister?‌​‍

Accepted Answer

2 — 2004-06 and 2011-16.‌​‍

Answer

1

Answer

4

Answer

3

Question 5

Which of the following types of joints allows for the greatest range of motion, such as in the shoulder and hip?

Accepted Answer

C. Ball and socket joint — Ball and socket joints, like those in the shoulder and hip, allow for multi-axial movement, including flexion, extension, abduction, adduction, rotation, and circumduction, providing the greatest range of motion. Hinge, pivot, and condyloid joints allow for more limited, specific types of movement.

Answer

A. Hinge joint

Answer

B. Pivot joint

Answer

D. Condyloid joint

Question 6

Vitamin K needed for:‌​‍

Accepted Answer

Blood clotting — Blood coagulation.‌​‍

Answer

Vision

Answer

Bones

Answer

Immunity

Question 7

Considering the industrial production and applications of polyethylene, which of the following statements correctly distinguishes between Low-Density Polyethylene (LDPE) and High-Density Polyethylene (HDPE)?

Accepted Answer

C. LDPE is produced via high-pressure free radical polymerization, leading to a highly branched molecular structure that results in lower density and greater flexibility, making it suitable for plastic films and squeeze bottles. In contrast, HDPE is synthesized using Ziegler-Natta or Phillips catalysts under lower pressure, yielding a more linear structure, higher density, and greater rigidity, ideal for milk jugs and pipes. — Option C accurately describes the differences. LDPE's highly branched structure, a result of high-pressure free radical polymerization, prevents close packing, leading to its lower density and flexibility, making it ideal for films. HDPE, produced with catalysts under lower pressure, has a more linear structure, allowing for denser packing, which results in higher rigidity and strength, suitable for items like milk jugs and pipes. Options A and B incorrectly swap the structural characteristics, production methods, and applications of LDPE and HDPE. Option D is incorrect because both LDPE and H

Answer

A. LDPE is formed under low pressure and temperature using Ziegler-Natta catalysts, resulting in a linear structure ideal for rigid pipes, while HDPE is produced via high-pressure processes, leading to branched structures suitable for flexible films.

Answer

B. HDPE is characterized by a high degree of branching in its polymer chains, making it less dense and more flexible for applications like plastic bags, whereas LDPE possesses a more linear structure, lending itself to rigid containers.

Answer

D. Both LDPE and HDPE are homopolymers of propene, but their differing densities arise from varying degrees of cross-linking, with LDPE having more cross-links for flexible applications and HDPE having fewer for rigid applications.

Question 8

Kerala's Saritha Nair case:‌​‍

Accepted Answer

2013 Solar — Solar-related.‌​‍

Answer

2020

Answer

2018

Answer

2015

Question 9

Which Kerala social reformer was involved in Kallumala Samaram / Perinad revolt?

Accepted Answer

Ayyankali — Ayyankali led the 1915 Kallumala Samaram at Perinad (Kollam).

Answer

Sree Narayana Guru

Answer

Poikayil Appachan

Answer

Chattampi Swamikal

Question 10

The peripheral nervous system (PNS) consists of:

Accepted Answer

B. Cranial nerves and spinal nerves — The peripheral nervous system (PNS) comprises all the nerves outside the brain and spinal cord, including the cranial nerves (originating from the brain) and spinal nerves (originating from the spinal cord), which transmit information to and from the central nervous system. The brain and spinal cord form the central nervous system (CNS), while the autonomic and somatic nervous systems are divisions *within* the PNS.

Answer

A. Brain and spinal cord

Answer

C. Cerebrum and cerebellum

Answer

D. Autonomic and somatic nervous systems

DCOA Mixed Practice Test #459