DCOA Mixed Practice Test #160

Question 1

Which of the following statements is NOT a characteristic feature of Continuous and Comprehensive Evaluation (CCE)?

Accepted Answer

B. It focuses solely on paper-pencil tests for academic assessment. — CCE aims to move beyond rote learning and mere paper-pencil tests by adopting diverse assessment tools and techniques, including observations, projects, quizzes, group work, and self-assessment, to provide a holistic picture of student learning. Therefore, focusing solely on paper-pencil tests contradicts the comprehensive nature of CCE. CCE does aim to reduce stress, uses various tools, and integrates diagnostic/remedial teaching.

Answer

A. It aims to reduce the stress of examinations on students.

Answer

C. It incorporates a wide range of tools and techniques for evaluation.

Answer

D. It emphasizes diagnostic and remedial teaching alongside regular assessment.

Question 2

Which of these is a halo group?‌​‍

Accepted Answer

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

Answer

−COOH

Answer

−OH

Answer

−CHO

Question 3

BOD stands for:‌​‍

Accepted Answer

Biological Oxygen Demand — Measures organic pollution in water — oxygen needed by microbes to decompose organic matter over 5 days at 20°C.‌​‍

Answer

Basic Organic Demand

Answer

Body Ocular Density

Answer

Big Ocean Depth

Question 4

Ozone layer protects by:

Accepted Answer

Absorbing UV-B/C radiation — Stratospheric O₃. Depletion by CFCs. Dobson Units (DU) measure. Antarctic 'hole' discovered 1985. Montreal Protocol 1987.

Answer

Producing O₂

Answer

Blocking all light

Answer

Cooling Earth

Question 5

Active immunity vs passive immunity:‌​‍

Accepted Answer

Active: own antibodies (vaccination, infection). Passive: ready-made antibodies (mother's milk, antiserum). — Active: slow, long-lasting. ‌​‍Passive: fast, short-lived. Snake anti-venom is passive.

Answer

Both acquired

Answer

Both innate

Answer

Same

Question 6

Which blood group is known as 'Universal Donor'?

Accepted Answer

O — O- is the universal donor (no A, B antigens, no Rh).

Answer

A

Answer

AB

Answer

B

Question 7

Sunderbans national park protects:

Accepted Answer

Royal Bengal Tiger — Royal Bengal Tiger habitat.

Answer

Rhino

Answer

Lion

Answer

Elephant

Question 8

Rh incompatibility in pregnancy occurs when:

Accepted Answer

Mother Rh−, baby Rh+ — Rh-negative mother may produce anti-Rh antibodies against Rh-positive fetus in subsequent pregnancies.

Answer

Mother Rh+, baby Rh−

Answer

Both Rh+

Answer

Both Rh−

Question 9

CAM plants:

Accepted Answer

Stomata open at night — Crassulacean Acid Metabolism — cacti, pineapple.

Answer

Normal

Answer

Submerged

Answer

Aquatic

Question 10

Which of these can be classified as a metalloid?‌​‍

Accepted Answer

Silicon — Metalloids (B, Si, Ge, As, Sb, Te) show intermediate properties between metals and non-metals.‌​‍

Answer

Lead

Answer

Iron

Answer

Carbon

DCOA Mixed Practice Test #160