DCOA Mixed Practice Test #328

Question 1

Archimedes' Principle:‌​‍

Accepted Answer

Buoyant force = weight of displaced fluid — Why objects float or sink.‌​‍

Answer

Pressure

Answer

Lever

Answer

Gravity

Question 2

Avogadro's number is approximately:‌​‍

Accepted Answer

6.022 × 10²³ — NA = 6.02214076 × 10²³ mol⁻¹ (exact SI definition since 2019).‌​‍

Answer

9.1 × 10⁻³¹

Answer

1.6 × 10⁻¹⁹

Answer

6.022 × 10¹⁹

Question 3

Paytm crisis:‌​‍

Accepted Answer

Paytm Payments Bank restrictions 2024 — RBI curbs on PPBL early 2024.‌​‍

Answer

Acquired

Answer

Closed

Answer

IPO 2024

Question 4

Transpose of A: (A^T)_ij =‌​‍

Accepted Answer

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

Answer

A_ij

Answer

0

Answer

-A_ij

Question 5

Iran President:‌​‍

Accepted Answer

Masoud Pezeshkian — Pezeshkian after Raisi's death.‌​‍

Answer

Rouhani

Answer

Raisi

Answer

Khatami

Question 6

Kerala District Planning Committee:

Accepted Answer

Both — Both — mandated by 74th Amendment.

Answer

Constitutional

Answer

Art 243ZD

Answer

Neither

Question 7

Centripetal force required to keep a body in circular motion is:‌​‍

Accepted Answer

mv²/r — F_c = mv²/r = mω²r; directed toward centre.‌​‍

Answer

mg

Answer

ma

Answer

F·d

Question 8

The atomic number of sodium is:

Accepted Answer

11 — Na = 11 protons, 12 neutrons typically, 11 electrons (2,8,1).

Answer

14

Answer

17

Answer

19

Question 9

The leaders of the 1921 Malabar Rebellion included:

Accepted Answer

Ali Musliyar, Variyankunnath Kunjahammed Haji, M.P. Narayana Menon — Malabar Rebellion leaders: Ali Musliyar, Variyankunnath Kunjahammed Haji, M.P. Narayana Menon.

Answer

Pazhassi Raja and Velu Thampi

Answer

T.K. Madhavan, Kelappan, Gandhi

Answer

Sree Narayana Guru, Ayyankali

Question 10

A teacher wants to foster a genuine love for reading in her elementary students. Which of the following strategies is most likely to cultivate intrinsic motivation for reading?

Accepted Answer

C. Creating a comfortable reading corner with a diverse selection of engaging books and allowing free choice. — Creating an environment that encourages free choice and provides engaging resources directly supports intrinsic motivation by making the activity enjoyable and personally relevant. Options A, B, and D are all examples of extrinsic motivators, relying on external rewards or punishments.

Answer

A. Awarding a prize to the student who reads the most books each month.

Answer

B. Requiring students to write detailed book reports for extra credit.

Answer

D. Threatening to assign additional homework if reading goals are not met.

DCOA Mixed Practice Test #328