DCOA Mixed Practice Test #23

Question 1

The process of converting unsaturated oils to saturated fats by adding hydrogen is:‌​‍

Accepted Answer

Hydrogenation — Vegetable oil + H₂ (Ni catalyst) → vanaspati/margarine.‌​‍

Answer

Halogenation

Answer

Hydration

Answer

Hydrolysis

Question 2

During skeletal muscle contraction, which ion is released from the sarcoplasmic reticulum and binds to troponin, initiating the sliding filament mechanism?

Accepted Answer

C. Calcium (Ca2+) — Calcium ions (Ca2+) are released from the sarcoplasmic reticulum and bind to troponin, causing a conformational change that exposes the myosin-binding sites on actin, thus initiating muscle contraction. Sodium and potassium are crucial for nerve impulse transmission and muscle action potentials, but calcium directly triggers the contractile mechanism. Chloride ions are not directly involved in initiating muscle contraction.

Answer

A. Sodium (Na+)

Answer

B. Potassium (K+)

Answer

D. Chloride (Cl-)

Question 3

Before introducing a complex topic on photosynthesis, a biology lecturer starts the class by providing a general overview of energy transformation in living organisms and its importance. This instructional strategy is best described as an application of:

Accepted Answer

C. Advance organizers — David Ausubel proposed advance organizers as a tool to help learners meaningfully link new information to existing knowledge by providing a conceptual framework before the main lesson. The lecturer's general overview serves as an expository advance organizer, facilitating meaningful reception learning. This is distinct from inductive reasoning, rote learning, or the broader constructivist approach.

Answer

A. Inductive reasoning

Answer

B. Rote learning

Answer

D. Constructivist approach

Question 4

A primary teacher observes that a significant number of her students struggle with reading comprehension despite various strategies. She decides to initiate an action research project. What is the most immediate and direct goal of her action research?

Accepted Answer

C. To systematically investigate and improve the reading comprehension levels within her own classroom. — Action research is primarily conducted by practitioners (teachers) to address specific problems in their own context and improve their practice. Its immediate goal is practical, context-specific improvement within the classroom, rather than broad generalization or external comparison for ranking.

Answer

A. To publish a research paper in a peer-reviewed academic journal.

Answer

B. To identify a universally effective reading comprehension strategy for all students.

Answer

D. To compare her students' performance with national averages to determine school ranking.

Question 5

Nuclear fusion occurs in:

Accepted Answer

Sun and stars — Proton-proton chain in Sun. Hydrogen bombs use fusion. Controlled fusion (ITER) under development.

Answer

Nuclear reactors

Answer

Atomic bombs

Answer

Uranium

Question 6

Kadambini Ganguly, one of India's first female university graduates, broke significant societal barriers in the late 19th century. Her achievement was not merely personal but symbolized a critical shift for women's status. What was the *most profound societal implication* of her pioneering academic success?

Accepted Answer

B. It challenged orthodox views on women's intellectual capabilities and their right to public life. — Kadambini Ganguly's graduation was a powerful statement against the prevalent societal norms that confined women to domestic roles and questioned their intellectual capacity. While it didn't immediately lead to equal employment or widespread women-only universities, it fundamentally challenged orthodox views and paved the way for greater acceptance of women in higher education and public life, inspiring others.

Answer

A. It directly led to the establishment of women-only universities across India.

Answer

C. It immediately resulted in equal employment opportunities for women in professional fields.

Answer

D. It primarily encouraged women from affluent families to pursue higher education abroad.

Question 7

Sabarimala women entry judgment:

Accepted Answer

2018 — 28 Sept 2018 — allowed women of all ages; review pending.

Answer

2017

Answer

2019

Answer

2020

Question 8

Nitrogen fixing bacteria in leguminous root nodules:‌​‍

Accepted Answer

Rhizobium (mutualistic with legumes) — Nitrogenase enzyme. ‌​‍Leghaemoglobin protects nitrogenase from O₂. Free-living: Azotobacter (aerobic), Clostridium (anaerobic).

Answer

Nitrosomonas

Answer

Clostridium

Answer

Azotobacter

Question 9

Kerala declared internet a basic right:

Accepted Answer

2019 — First state (2019).

Answer

2020

Answer

2018

Answer

2021

Question 10

A high school student consistently achieves top marks across all subjects, including Physics, Literature, and History, and also excels in logical reasoning competitions. Which theory of intelligence best accounts for this student's broad academic success?

Accepted Answer

C. Spearman's Two-Factor Theory — Spearman's Two-Factor Theory posits a 'g-factor' (general intelligence) that underlies performance across a wide range of cognitive tasks. This 'g-factor' explains why a student might perform consistently well in diverse academic subjects and logical reasoning, indicating a strong general intellectual ability. Gardner's theory emphasizes distinct intelligences, while Sternberg focuses on analytical, creative, and practical aspects, and Thurstone on specific primary mental abilities, none of which primarily explain such broad, consistent academic excellence through a single overarching factor.

Answer

A. Gardner's Theory of Multiple Intelligences

Answer

B. Sternberg's Triarchic Theory of Intelligence

Answer

D. Thurstone's Theory of Primary Mental Abilities

DCOA Mixed Practice Test #23