DCOA Mixed Practice Test #631

Question 1

Which of the following polymers is synthesized through an addition polymerization process and is used extensively in the manufacture of non-stick cookware coatings?

Accepted Answer

B. Polytetrafluoroethylene (PTFE) — Polytetrafluoroethylene (PTFE) is produced via addition polymerization of tetrafluoroethylene monomers and is renowned for its non-stick properties due to the strong carbon-fluorine bonds. PET is a condensation polymer, PVC and polycarbonate are used in different applications not primarily for non-stick coatings.

Answer

A. Polyethylene terephthalate (PET)

Answer

C. Polyvinyl chloride (PVC)

Answer

D. Polycarbonate (PC)

Question 2

Isoseismal map shows:‌​‍

Accepted Answer

Earthquake intensity zones — Lines connecting equal intensity.‌​‍

Answer

Depth

Answer

Magnitude

Answer

Epicenter only

Question 3

J&K first Assembly post-2019:‌​‍

Accepted Answer

Sept-Oct 2024 elections — Held Sept-Oct 2024 for first time since reorganisation.‌​‍

Answer

2019

Answer

2023

Answer

2020

Question 4

Abdul Kalam's role:‌​‍

Accepted Answer

President, DRDO, ISRO — Multiple — Integrated Guided Missile Development, SLV, President.‌​‍

Answer

Just missile

Answer

Just scientist

Answer

Just President

Question 5

The 'Land of Rising Sun' is:

Accepted Answer

Japan — Japan is called the 'Land of the Rising Sun' because the kanji for Japan (日本) literally means 'origin of the sun'.

Answer

China

Answer

Thailand

Answer

South Korea

Question 6

A beam of light passes from air into a glass block with an angle of incidence of 30 degrees. If the refractive index of the glass is 1.5, what is the angle of refraction inside the glass?

Accepted Answer

B. 19.47 degrees — Using Snell's law: n1 sin(θ1) = n2 sin(θ2), where n1=1 (air), θ1=30°, and n2=1.5 (glass). Solving for θ2 gives approximately 19.47 degrees, which is less than the angle of incidence due to light bending toward the normal in the denser medium. The other options are either too small or do not account for the refractive index difference.

Answer

A. 15 degrees

Answer

C. 25 degrees

Answer

D. 30 degrees

Question 7

A teacher conducts action research to improve student participation in discussions. After analyzing the data, they find that students are more engaged when using small-group activities instead of whole-class lectures. What should be the NEXT step in the action research cycle?

Accepted Answer

B. Modify the strategy based on feedback and repeat the cycle with new data collection — Action research is iterative; after analyzing results, the teacher should refine the strategy (e.g., based on feedback) and repeat the cycle (B). Testing in another class (A) is helpful but secondary to refining the approach. Publishing (C) or discontinuing (D) is premature at this stage.

Answer

A. Implement the small-group strategy in another class to test generalizability

Answer

C. Publish the findings in a teaching journal to share with the wider community

Answer

D. Discontinue the action research as the problem is solved

Question 8

The process by which plants lose water vapour through leaves is:

Accepted Answer

Transpiration — Transpiration occurs mainly through stomata; cools plant and aids upward water transport.

Answer

Respiration

Answer

Evaporation

Answer

Guttation

Question 9

Inactivated virus vaccine:

Accepted Answer

Covaxin — Whole killed virus.

Answer

Covishield

Answer

Pfizer

Answer

Moderna

Question 10

A high school science teacher wants to improve student participation in classroom discussions. She decides to conduct action research. After identifying the problem and reviewing relevant literature, what is the crucial next step in the action research cycle?

Accepted Answer

C. Collecting baseline data on current student participation levels and identifying contributing factors. — In the action research cycle (Plan-Act-Observe-Reflect), after identifying the problem, the 'Plan' stage involves understanding the current situation. Collecting baseline data is essential to accurately define the problem, measure its extent, and later evaluate the impact of any intervention. Implementing a strategy without baseline data (A) or just formulating a hypothesis (B) skips this crucial observational step. Presenting to administration (D) is an administrative step, not a core research cycle step.

Answer

A. Immediately implementing a new discussion strategy to see if it works.

Answer

B. Formulating a hypothesis about the causes of low participation and designing an intervention.

Answer

D. Presenting the problem to the school administration for their approval and support.

DCOA Mixed Practice Test #631