DCOA Mixed Practice Test #45

Question 1

Symbol of Silver:

Accepted Answer

Ag — Ag (Argentum).

Answer

Si

Answer

Sv

Answer

Au

Question 2

Oxidation is:‌​‍

Accepted Answer

Loss of electrons — OIL RIG — Oxidation Is Loss, Reduction Is Gain (of electrons). ‌​‍Oxidising agent itself gets reduced.

Answer

Gain of H

Answer

Loss of O

Answer

Gain of electrons

Question 3

To effectively manage potential conflicts and build a cohesive classroom community, which of the following practices should a teacher prioritize at the beginning of the academic year?

Accepted Answer

A. Establishing clear procedures for transitions and daily routines. — Establishing clear procedures and daily routines provides structure, predictability, and reduces ambiguity, which are foundational for preventing many common disruptions and fostering a sense of security. Fixed seating (B) can be restrictive and may not always be optimal. Focusing primarily on punishment (C) creates a negative environment. Minimizing interaction (D) hinders rapport and community building.

Answer

B. Assigning students to fixed seating arrangements for the entire year.

Answer

C. Focusing primarily on strict punishment for rule violations.

Answer

D. Minimizing student-teacher interaction to maintain authority.

Question 4

The lifespan of a human RBC is approximately:

Accepted Answer

120 days — RBCs circulate ~120 days before being removed by the spleen/liver.

Answer

30 days

Answer

60 days

Answer

365 days

Question 5

Chief of the Air Staff, Indian Air Force (as of 2026):

Accepted Answer

AP Singh — Air Chief Marshal AP Singh has been Chief of the Air Staff since 30 September 2024 (current as of 2026). VR Chaudhari served Sep 2021-Sep 2024; RKS Bhadauria 2019-2021. Note: current-office questions are time-sensitive - this answer reflects 2026.

Answer

VR Chaudhari

Answer

Both A and B

Answer

RKS Bhadauria

Question 6

Which king issued the Temple Entry Proclamation?‌​‍

Accepted Answer

Chithira Thirunal Balarama Varma — Sree Chithira Thirunal of Travancore signed the Proclamation on 12 November 1936.‌​‍

Answer

Sree Moolam Thirunal Rama Varma

Answer

Marthanda Varma

Answer

Visakham Thirunal Rama Varma

Question 7

The functional group of a carboxylic acid is:‌​‍

Accepted Answer

−COOH — −COOH (carboxyl) = acetic acid, formic acid etc.‌​‍

Answer

−CO−

Answer

−OH

Answer

−CHO

Question 8

The axis of the Earth is inclined to the plane of its orbit at an angle of:‌​‍

Accepted Answer

23.5° — Earth's axial tilt of 23.5° produces seasons as the planet revolves around the Sun.‌​‍

Answer

24.5°

Answer

25°

Answer

22.5°

Question 9

Noida International Airport:‌​‍

Accepted Answer

Both — Both.‌​‍

Answer

Greater Noida

Answer

Jewar

Answer

Under construction

Question 10

A stethoscope is used to:‌​‍

Accepted Answer

Listen to heart/lung sounds — Stethoscope is used by doctors to listen to internal body sounds (heart, lungs, abdomen).‌​‍

Answer

Measure BP

Answer

Check temperature

Answer

Test vision

DCOA Mixed Practice Test #45