VFA Mixed Practice Test #737

Question 1

Semiconductor diode as rectifier:‌​‍

Accepted Answer

Converts AC to DC — Half-wave uses 1 diode; full-wave bridge uses 4 diodes. ‌​‍Capacitor smooths output.

Answer

Amplifies

Answer

Generates AC

Answer

Only blocks

Question 2

Many enzymes require non-protein components to exhibit their catalytic activity. These components, if organic molecules, are often referred to as coenzymes. What is the primary function of a coenzyme in an enzymatic reaction?

Accepted Answer

C. To carry chemical groups or electrons between enzymes. — Coenzymes are organic non-protein molecules that often function as intermediate carriers of electrons or specific chemical groups (e.g., phosphate, acetyl, methyl groups) during enzymatic reactions. They assist enzymes in catalysis by facilitating the transfer of these groups, without being consumed in the overall reaction. They do not provide activation energy or inhibit enzymes.

Answer

A. To provide the activation energy for the reaction.

Answer

B. To act as a competitive inhibitor of the enzyme.

Answer

D. To irreversibly bind to the active site and denature the enzyme.

Question 3

Which disease is caused by the deficiency of Vitamin D?‌​‍

Accepted Answer

Rickets — Rickets (in children) and Osteomalacia (in adults) are caused by Vitamin D deficiency. ‌​‍Vitamin D is obtained from sunlight and helps in calcium absorption.

Answer

Scurvy

Answer

Beriberi

Answer

Night Blindness

Question 4

A teacher regularly uses short quizzes, classroom discussions, and observation during lessons to gauge student understanding and adjust teaching strategies in real-time. This ongoing process for improving instruction and learning is characteristic of:

Accepted Answer

B. Formative Assessment — Formative assessment is designed to monitor student learning during instruction and provide ongoing feedback to both students and teachers. Its primary purpose is to improve teaching and learning as it happens, not just at the end of a unit. Diagnostic assessment identifies prior knowledge gaps, summative measures learning at the end, and norm-referenced compares students to a larger group.

Answer

A. Diagnostic Assessment

Answer

C. Summative Assessment

Answer

D. Norm-referenced Assessment

Question 5

The first element of the halogen group is:‌​‍

Accepted Answer

Fluorine — Group 17 starts with F (most electronegative element).‌​‍

Answer

Bromine

Answer

Iodine

Answer

Chlorine

Question 6

HTTP default port:‌​‍

Accepted Answer

80 (HTTPS: 443) — Common: FTP 21, SSH 22, SMTP 25, DNS 53, HTTP 80, HTTPS 443, MySQL 3306. ‌​‍Stateless protocol.

Answer

25

Answer

3306

Answer

21

Question 7

Hydroelectric power plants convert:‌​‍

Accepted Answer

Potential energy of stored water to electrical (via kinetic energy and turbine) — Dammed water falls, spinning turbines connected to generators.‌​‍

Answer

Wind to electricity

Answer

Chemical energy to electrical

Answer

Sunlight to electricity

Question 8

Which of the following best describes the primary purpose of formative assessment in a classroom setting?

Accepted Answer

B. To identify learning gaps and provide timely feedback for improvement. — Formative assessment is designed to monitor student learning during instruction to provide ongoing feedback that can be used by instructors to improve their teaching and by students to improve their learning. Options A, C, and D describe purposes typically associated with summative assessment, which occurs at the end of a learning period for evaluation.

Answer

A. To assign final grades at the end of a course.

Answer

C. To compare student performance against a national standard.

Answer

D. To rank students based on their overall academic achievement.

Question 9

Kerala produces ___ % of India's coconut:

Accepted Answer

30% — About 30% of India's coconut.

Answer

20%

Answer

45%

Answer

60%

Question 10

The 'Connect to Work' scheme in Kerala provides a monthly stipend of:‌​‍

Accepted Answer

Rs 1,000 — Rs 1,000/month to job-seekers aged 18-35. ‌​‍Over 75,376 beneficiaries covered so far.

Answer

Rs 500

Answer

Rs 1,500

Answer

Rs 2,000

VFA Mixed Practice Test #737