DCOA Mixed Practice Test #276

Question 1

Antibodies are produced by:‌​‍

Accepted Answer

B lymphocytes (plasma cells) — B cells differentiate into plasma cells that secrete antibodies against specific antigens.‌​‍

Answer

Liver cells

Answer

Platelets

Answer

Red blood cells

Question 2

Kerala Lottery first:

Accepted Answer

1967 — State lottery started 1967.

Answer

1970

Answer

1957

Answer

1980

Question 3

Longest river South America:‌​‍

Accepted Answer

Amazon — Amazon.‌​‍

Answer

Orinoco

Answer

Parana

Answer

São Francisco

Question 4

The Nobel Prize in Literature for 1901 (first-ever) went to:

Accepted Answer

Sully Prudhomme (France) — Sully Prudhomme received the first Nobel Literature prize in 1901.

Answer

Kipling

Answer

Yeats

Answer

Tagore

Question 5

The essential ion required for muscle contraction, facilitating the interaction between actin and myosin filaments, is:

Accepted Answer

C. Calcium (Ca2+) — Calcium ions (Ca2+) play a pivotal role in muscle contraction. When released from the sarcoplasmic reticulum, Ca2+ binds to troponin, causing a conformational change that moves tropomyosin away from the actin binding sites, thereby allowing myosin heads to attach to actin and initiate the contraction cycle. Sodium and potassium ions are crucial for nerve impulse transmission and muscle action potentials, but not directly for the actin-myosin interaction itself.

Answer

A. Sodium (Na+)

Answer

B. Potassium (K+)

Answer

D. Chloride (Cl-)

Question 6

Deepika (oldest running Malayalam):

Accepted Answer

1887 — Nasrani Deepika 1887 — oldest Malayalam paper still running.

Answer

1900

Answer

1920

Answer

1947

Question 7

The 2024 Olympic Games were held in:‌​‍

Accepted Answer

Paris — Paris hosted the 2024 Summer Olympics. ‌​‍Tokyo hosted 2020 (held 2021). LA will host 2028.

Answer

Tokyo

Answer

Los Angeles

Answer

London

Question 8

Which is a cloud storage service by Google?

Accepted Answer

Google Drive — Google Drive (launched 2012) is Google's cloud storage; OneDrive is Microsoft's, iCloud is Apple's.

Answer

OneDrive

Answer

iCloud

Answer

Dropbox

Question 9

Epsom salt is:‌​‍

Accepted Answer

MgSO₄ — Epsom salt = Magnesium Sulphate (MgSO₄·7H₂O). ‌​‍Used in medicine and as bath salts.

Answer

NaCl

Answer

CaSO₄

Answer

KCl

Question 10

The ship on which Darwin made his famous voyage was:‌​‍

Accepted Answer

HMS Beagle — Darwin sailed on HMS Beagle (1831–1836), visiting the Galápagos, S. ‌​‍America etc.

Answer

HMS Endeavour

Answer

HMS Discovery

Answer

HMS Victory

DCOA Mixed Practice Test #276