VFA Mixed Practice Test #661

Question 1

The term 'Tsunami' is derived from which language?‌​‍

Accepted Answer

Japanese — Tsunami is a Japanese word meaning 'harbour wave' (tsu = harbour, nami = wave).‌​‍

Answer

Latin

Answer

Greek

Answer

Sanskrit

Question 2

Rolling without slipping requires:

Accepted Answer

v = ωR — Condition for pure rolling. Contact point instantaneously at rest.

Answer

v = 0

Answer

v = ω/R

Answer

ω = 0

Question 3

Kerala Old Age Pension eligibility:

Accepted Answer

60+ — 60+ years.

Answer

65+

Answer

55+

Answer

All retired

Question 4

Which of the following best describes the primary purpose of a summative assessment?

Accepted Answer

A. To evaluate overall student learning and assign final grades at the end of an instructional period. — Summative assessment is conducted at the end of a learning period to evaluate overall student learning against a standard or benchmark. Its main purpose is to summarize what students have learned and often involves assigning grades or certifications. Options B, C, and D describe formative, diagnostic, and norm-referenced assessment purposes respectively, which are distinct from summative evaluation.

Answer

B. To monitor student progress and provide ongoing feedback during a learning unit.

Answer

C. To identify students' prior knowledge and learning gaps before instruction begins.

Answer

D. To compare an individual student's performance against a larger group or national average.

Question 5

Solid state — crystalline solids have:‌​‍

Accepted Answer

Long-range order, sharp melting point — Amorphous solids (glass, rubber): no long-range order, melt over range. ‌​‍Crystalline: NaCl, diamond, metals.

Answer

Amorphous structure

Answer

Only short range

Answer

No order

Question 6

Isoseismal lines connect points of equal:‌​‍

Accepted Answer

Intensity (from modified Mercalli scale) — Mercalli (I-XII) is intensity (damage). ‌​‍Richter/Moment magnitude is energy released (logarithmic). Epicentre = surface above focus.

Answer

Depth

Answer

Magnitude

Answer

Time

Question 7

Scurvy = deficiency of:‌​‍

Accepted Answer

C — Vitamin C.‌​‍

Answer

A

Answer

B

Answer

D

Question 8

Considering the industrial production and applications of polyethylene, which of the following statements correctly distinguishes between Low-Density Polyethylene (LDPE) and High-Density Polyethylene (HDPE)?

Accepted Answer

C. LDPE is produced via high-pressure free radical polymerization, leading to a highly branched molecular structure that results in lower density and greater flexibility, making it suitable for plastic films and squeeze bottles. In contrast, HDPE is synthesized using Ziegler-Natta or Phillips catalysts under lower pressure, yielding a more linear structure, higher density, and greater rigidity, ideal for milk jugs and pipes. — Option C accurately describes the differences. LDPE's highly branched structure, a result of high-pressure free radical polymerization, prevents close packing, leading to its lower density and flexibility, making it ideal for films. HDPE, produced with catalysts under lower pressure, has a more linear structure, allowing for denser packing, which results in higher rigidity and strength, suitable for items like milk jugs and pipes. Options A and B incorrectly swap the structural characteristics, production methods, and applications of LDPE and HDPE. Option D is incorrect because both LDPE and H

Answer

A. LDPE is formed under low pressure and temperature using Ziegler-Natta catalysts, resulting in a linear structure ideal for rigid pipes, while HDPE is produced via high-pressure processes, leading to branched structures suitable for flexible films.

Answer

B. HDPE is characterized by a high degree of branching in its polymer chains, making it less dense and more flexible for applications like plastic bags, whereas LDPE possesses a more linear structure, lending itself to rigid containers.

Answer

D. Both LDPE and HDPE are homopolymers of propene, but their differing densities arise from varying degrees of cross-linking, with LDPE having more cross-links for flexible applications and HDPE having fewer for rigid applications.

Question 9

Ultrasound has frequency above:‌​‍

Accepted Answer

20,000 Hz — Ultrasound = above 20,000 Hz (above human hearing range). ‌​‍Used in medical scans (sonography).

Answer

20 Hz

Answer

200 Hz

Answer

2,000 Hz

Question 10

SCTIMST:

Accepted Answer

Sree Chitra Tirunal Institute of Medical Science — Autonomous institute under DST.

Answer

Private

Answer

Pvt

Answer

Both

VFA Mixed Practice Test #661