DCOA Mixed Practice Test #155

Question 1

Periyar is the longest river in:‌​‍

Accepted Answer

Kerala — Periyar (244 km) is Kerala's longest river.‌​‍

Answer

India

Answer

Tamil Nadu

Answer

Karnataka

Question 2

Kerala legislature is:‌​‍

Accepted Answer

Unicameral — Unicameral — only Vidhan Sabha (140 seats), no upper house.‌​‍

Answer

Bicameral

Answer

Tricameral

Answer

None

Question 3

Chromosome number in humans:‌​‍

Accepted Answer

46 — 46 (23 pairs). 22 autosome pairs + 1 sex pair.‌​‍

Answer

48

Answer

23

Answer

44

Question 4

A teacher observes that her students are highly engaged in a science project, spending extra hours voluntarily, collaborating effectively, and showing genuine curiosity about the topic, even without the promise of extra marks or rewards. This scenario primarily demonstrates which type of motivation?

Accepted Answer

B. Intrinsic motivation — Intrinsic motivation stems from internal desires and enjoyment of the activity itself, as evidenced by the students' voluntary engagement, curiosity, and collaboration without external rewards. Extrinsic motivation would involve external incentives like marks or prizes. Achievement and affiliation are specific types of motivational drives but do not represent the core classification as well as intrinsic motivation in this context.

Answer

A. Extrinsic motivation

Answer

C. Achievement motivation

Answer

D. Affiliation motivation

Question 5

Aqua regia is a mixture of:‌​‍

Accepted Answer

HCl + HNO₃ — Aqua regia (3:1 HCl:HNO₃) can dissolve gold and platinum — 'Royal Water'.‌​‍

Answer

H₂SO₄ + HCl

Answer

HNO₃ + H₂SO₄

Answer

HCl + CH₃COOH

Question 6

CRISPR-Cas9 is used for:‌​‍

Accepted Answer

Gene editing — precise DNA cuts guided by RNA — From bacterial immune system. ‌​‍Nobel 2020 (Charpentier & Doudna). Applications: therapy, agriculture, basic research.

Answer

Vaccination

Answer

Staining

Answer

Only diagnostics

Question 7

Coriolis force arises from:‌​‍

Accepted Answer

Earth's rotation — Deflects moving objects right in NH, left in SH. ‌​‍Zero at equator. Affects winds, ocean currents, cyclones.

Answer

Gravity

Answer

Ocean tides

Answer

Solar wind

Question 8

BCCI Secretary 2024:‌​‍

Accepted Answer

Jay Shah till Oct 2024 — Jay Shah moved to ICC Chair.‌​‍

Answer

Rajeev Shukla

Answer

Ganguly

Answer

Binny

Question 9

A teacher frequently changes their voice pitch, gestures, and interaction styles during a lesson to maintain student engagement. Which microteaching skill is being effectively demonstrated?

Accepted Answer

C. Stimulus Variation — Stimulus Variation is a microteaching skill that involves changing the teacher's movements, gestures, voice, and interaction patterns to keep students attentive and engaged. Reinforcement focuses on encouraging desired student behaviors, explanation on presenting content clearly, and questioning fluency on the skillful use of questions.

Answer

A. Reinforcement

Answer

B. Explanation

Answer

D. Questioning Fluency

Question 10

The largest producer of rubber in India is:

Accepted Answer

Kerala — Kerala produces ~70% of India's natural rubber; Kottayam is the hub.

Answer

Tamil Nadu

Answer

Karnataka

Answer

Tripura

DCOA Mixed Practice Test #155