VFA Mixed Practice Test #398

Question 1

When was the National Testing Agency (NTA) established?‌​‍

Accepted Answer

2017 — Established 2017.‌​‍

Answer

2018

Answer

2020

Answer

2019

Question 2

CTBT (Comprehensive Test Ban Treaty) has been signed but not ratified by India because:

Accepted Answer

India objects to its discriminatory nature (doesn't cover P5's existing arsenals) — India sees CTBT and NPT as discriminatory — favours existing nuclear powers. Pokhran-II tests (1998) before India could join.

Answer

Technical issues

Answer

Political reasons

Answer

Not applicable

Question 3

Which of the following is the PRIMARY reason for using a desiccant in the packaging of effervescent tablets?

Accepted Answer

B. To absorb moisture and maintain stability — Effervescent tablets are highly hygroscopic and can degrade if exposed to moisture. A desiccant absorbs moisture, preserving the tablet's stability. Option A is incorrect as desiccants do not primarily prevent microbial contamination. Options C and D are unrelated to the function of a desiccant.

Answer

A. To prevent microbial contamination

Answer

C. To enhance the dissolution rate of the tablet

Answer

D. To improve the tablet's hardness

Question 4

Brass = copper +:‌​‍

Accepted Answer

Zinc — Brass=Cu+Zn. Bronze=Cu+Sn. Steel=Fe+C.‌​‍

Answer

Tin

Answer

Iron

Answer

Carbon

Question 5

Which of the following best describes the typical timing and purpose of formative assessment within an instructional cycle?

Accepted Answer

B. Implemented throughout the learning process to provide ongoing feedback for improvement. — Formative assessment is designed to occur continuously throughout the instructional process, providing timely feedback to both students and teachers to adjust teaching and learning strategies for improvement. Option A describes summative assessment, C describes diagnostic assessment, and D refers to large-scale standardized testing.

Answer

A. Conducted at the end of a unit to assign final grades and evaluate mastery.

Answer

C. Administered before instruction begins to identify students' prior knowledge and misconceptions.

Answer

D. Utilized annually to compare student performance against national benchmarks.

Question 6

de Broglie wavelength of particle with momentum p:‌​‍

Accepted Answer

λ = h/p — Matter waves. ‌​‍Electron diffraction (Davisson-Germer, 1927) confirmed. λ for electron at 100 V ~0.12 nm.

Answer

λ = p/h

Answer

λ = hc

Answer

λ = hν

Question 7

A walks 3m N, then 4m E. Displacement:‌​‍

Accepted Answer

5m — North and East are perpendicular. ‌​‍Displacement is the straight-line distance from start to end = √(3² + 4²) = √25 = 5m (by Pythagoras).

Answer

10m

Answer

1m

Answer

7m

Question 8

The normal blood pressure reading is:‌​‍

Accepted Answer

120/80 mmHg — Normal BP = 120/80 mmHg (systolic/diastolic).‌​‍

Answer

80/120 mmHg

Answer

140/90 mmHg

Answer

100/60 mmHg

Question 9

Number of teeth in adults:

Accepted Answer

32 — 32 permanent teeth.

Answer

28

Answer

30

Answer

34

Question 10

Kerala coastline length:‌​‍

Accepted Answer

590 km — About 590 km (some sources 580).‌​‍

Answer

400 km

Answer

500 km

Answer

700 km

VFA Mixed Practice Test #398