DCOA Mixed Practice Test #603

Question 1

Aikya Kerala movement culminated on which date with Kerala's formation?‌​‍

Accepted Answer

1 November 1956 — Kerala State came into existence on 1 November 1956 under States Reorganisation Act.‌​‍

Answer

26 January 1950

Answer

1 July 1949

Answer

15 August 1947

Question 2

Vakkom Moulavi called:‌​‍

Accepted Answer

Father of Muslim Renaissance in Kerala — Muslim reformer. Founded Swadeshabhimani.‌​‍

Answer

Kerala Gandhi

Answer

Kerala Simham

Answer

Lincoln of Kerala

Question 3

SONAR, used to detect underwater objects, stands for:

Accepted Answer

Sound Navigation And Ranging — SONAR sends ultrasonic pulses and measures echo time to map underwater objects.

Answer

Sound Overseas Navy Response

Answer

Subsonic Ocean Navy Array

Answer

Sonic Object Ranging

Question 4

Goitre is caused by deficiency of:‌​‍

Accepted Answer

Iodine — Iodine deficiency impairs thyroxin production → enlarged thyroid (goitre).‌​‍

Answer

Iron

Answer

Calcium

Answer

Vitamin C

Question 5

Modulation index in AM is:‌​‍

Accepted Answer

Amplitude of signal / amplitude of carrier (≤ 1 to avoid distortion) — μ = Am/Ac. Over-modulation (μ>1) causes distortion.‌​‍

Answer

Phase ratio

Answer

Frequency ratio

Answer

Power ratio

Question 6

Sildenafil, commonly known as Viagra, exerts its therapeutic effect in erectile dysfunction by:

Accepted Answer

B. Inhibiting phosphodiesterase-5 (PDE5) — Sildenafil is a selective inhibitor of phosphodiesterase-5 (PDE5), an enzyme responsible for the degradation of cyclic guanosine monophosphate (cGMP) in the corpus cavernosum. By inhibiting PDE5, sildenafil increases cGMP levels, leading to smooth muscle relaxation and enhanced blood flow into the penis, facilitating an erection in response to sexual stimulation. While nitric oxide is involved, sildenafil doesn't directly increase its release or activate guanylyl cyclase; rather, it amplifies the effects of existing nitric oxide.

Answer

A. Blocking alpha-adrenergic receptors

Answer

C. Increasing the release of nitric oxide directly

Answer

D. Activating guanylyl cyclase

Question 7

The post-Cold War era (1991 onwards) is characterised by:‌​‍

Accepted Answer

Unipolar (US dominance) then moving toward multipolar — 1990s-2000s: unipolar US moment. ‌​‍Rise of China, India, EU, BRICS → multipolar world. Russia-China-West tensions post-2014.

Answer

Trilateral

Answer

Bipolar

Answer

Bipolar

Question 8

The gas used in advertising signs (neon lights) is:‌​‍

Accepted Answer

Neon — Neon gas glows red-orange when electrified — used in neon signs.‌​‍

Answer

Argon

Answer

Helium

Answer

Xenon

Question 9

The Malabar Rebellion took place in:‌​‍

Accepted Answer

1921 — The Malabar Rebellion (Mappila Rebellion) took place in 1921.‌​‍

Answer

1919

Answer

1920

Answer

1922

Question 10

What is the (i,j)-th element of the transpose of matrix A?‌​‍

Accepted Answer

A_ji — Rows become columns. (AB)^T = B^T·A^T. Symmetric matrix: A = A^T.‌​‍

Answer

0

Answer

A_ij

Answer

-A_ij

DCOA Mixed Practice Test #603