DCOA Mixed Practice Test #486

Question 1

Which alkali metal is used in sodium vapour lamps for yellow light?‌​‍

Accepted Answer

Sodium — Sodium vapour lamps produce yellow (~589 nm) light — used in streetlamps historically.‌​‍

Answer

Potassium

Answer

Caesium

Answer

Lithium

Question 2

A teacher wants to assess students' understanding of a historical event using a digital tool that encourages collaboration and critical thinking. Which tool would be MOST appropriate?

Accepted Answer

B. Padlet or Miro for collaborative mind-mapping and discussion — Padlet or Miro allows students to collaboratively create mind maps, add multimedia resources, and engage in discussions, fostering critical thinking and teamwork. While Google Forms and WordPress lack real-time collaboration, pre-recorded lectures are passive and do not encourage interactive learning.

Answer

A. Multiple-choice quiz on Google Forms

Answer

C. A pre-recorded lecture on YouTube

Answer

D. Individual blog posts on WordPress

Question 3

Which of the following statements best describes the role of creatinine in clinical biochemistry?

Accepted Answer

A. It is a byproduct of muscle metabolism and is excreted by the kidneys — Creatinine is a waste product generated from muscle metabolism (creatine phosphate breakdown) and is excreted by the kidneys. It is used clinically to estimate glomerular filtration rate (GFR) and assess renal function. It is not synthesized in the liver, a hormone, or a neurotransmitter.

Answer

B. It is synthesized in the liver and used for energy production in muscles

Answer

C. It is a hormone released by the thyroid gland to regulate metabolism

Answer

D. It is a neurotransmitter involved in synaptic transmission

Question 4

A nucleotide consists of:

Accepted Answer

Base + sugar + phosphate — Each nucleotide = nitrogenous base + pentose sugar + phosphate group.

Answer

Only a base

Answer

Two sugars

Answer

Two bases

Question 5

Respiratory pigment in humans:

Accepted Answer

Haemoglobin (Fe-containing, in RBC) — Each Hb carries 4 O₂. Haemocyanin (Cu) in molluscs. Myoglobin stores O₂ in muscles.

Answer

Haemocyanin

Answer

Chlorophyll

Answer

Myoglobin only

Question 6

The Women's Wall in Kerala was formed in:‌​‍

Accepted Answer

2019 — The Women's Wall (Vanitha Mathil) on 1 January 2019 — ~5.5 million women formed a 620 km human chain.‌​‍

Answer

2017

Answer

2018

Answer

2020

Question 7

Kerala's electrification year (100%):

Accepted Answer

2017 — First fully electrified state — 2017.

Answer

2019

Answer

2021

Answer

2015

Question 8

Local anesthetics like Lidocaine block nerve impulse conduction by interfering with the influx of which ion into the nerve cell, thereby stabilizing the neuronal membrane?

Accepted Answer

C. Sodium ions — Local anesthetics like Lidocaine exert their effect by reversibly binding to and blocking voltage-gated sodium channels in the neuronal membrane. This action prevents the influx of sodium ions, thereby inhibiting the initiation and propagation of action potentials along nerve fibers and leading to a loss of sensation in the targeted area.

Answer

A. Potassium ions

Answer

B. Calcium ions

Answer

D. Chloride ions

Question 9

Which of these is a halo group?

Accepted Answer

−Cl or −Br — Halogen groups: −F, −Cl, −Br, −I (found in haloalkanes/haloarenes).

Answer

−OH

Answer

−CHO

Answer

−COOH

Question 10

UPI transactions 2024 (monthly peak):‌​‍

Accepted Answer

15+ billion — Crossed 15+ billion transactions per month in 2024.‌​‍

Answer

10 billion

Answer

5 billion

Answer

20 billion

DCOA Mixed Practice Test #486