VFA Mixed Practice Test #567

Question 1

A mirage is due to:‌​‍

Accepted Answer

Total internal reflection — Mirages are caused by total internal reflection of light in layers of hot air near the ground.‌​‍

Answer

Reflection

Answer

Dispersion

Answer

Diffraction

Question 2

Ms. Leena, an HSA teacher, observes her students becoming increasingly restless and disengaged during a long explanation of a new concept. To proactively manage potential disruptive behavior, which of the following strategies would be most effective?

Accepted Answer

B. Pause the explanation and introduce a quick, relevant energizer activity. — Proactive strategies aim to prevent issues before they escalate. Introducing an energizer re-engages students and breaks monotony, preventing restlessness from escalating into misbehavior. Assigning silent work or issuing warnings are often reactive, and ignoring the behavior is not an effective management technique.

Answer

A. Immediately assign individual silent work to calm them down.

Answer

C. Warn students that any talking will result in immediate detention.

Answer

D. Ignore the restlessness, assuming they will eventually settle down.

Question 3

IST reference:

Accepted Answer

82.5°E Mirzapur — 82°30'E meridian.

Answer

75°E

Answer

90°E

Answer

70°E

Question 4

Ovum produced in:‌​‍

Accepted Answer

Ovary — Ovarian follicles.‌​‍

Answer

Uterus

Answer

Fallopian tube

Answer

Vagina

Question 5

Pampa river length:‌​‍

Accepted Answer

176 km — 176 km — third longest in Kerala.‌​‍

Answer

144 km

Answer

209 km

Answer

244 km

Question 6

What are the primary roles of an operating system?‌​‍

Accepted Answer

Process, memory, file, device management; user interface — Examples: Windows, Linux, macOS, Android, iOS. ‌​‍Kernel is core. Linus Torvalds (1991) — Linux.

Answer

Only files

Answer

Only memory

Answer

Only UI

Question 7

Statements about Marayoor — which are TRUE? ‌​‍(i) Small town in Idukki Taluk (ii) Prehistoric rock paintings (iii) Famous for sandalwood forests (iv) Scenic Pambar river

Accepted Answer

All four — All four are correct facts about Marayoor (Idukki district).‌​‍

Answer

(i), (iii), (iv)

Answer

(ii), (iii), (iv)

Answer

(i), (ii), (iii)

Question 8

Oral Rehydration Salts (ORS) are crucial for managing dehydration, especially in diarrheal diseases. The effectiveness of ORS relies on the co-transport of which two key components across the intestinal wall?

Accepted Answer

C. Sodium and Glucose — The effectiveness of Oral Rehydration Salts (ORS) relies on the sodium-glucose co-transport system in the small intestine. Glucose enhances the absorption of sodium and water from the gut lumen into the systemic circulation, thereby rehydrating the patient. Other pairs are not the primary co-transport mechanism for ORS.

Answer

A. Sodium and Chloride

Answer

B. Potassium and Glucose

Answer

D. Chloride and Bicarbonate

Question 9

Pasteurisation of milk kills bacteria using:‌​‍

Accepted Answer

Heat followed by rapid cooling — Milk heated to 63–72 °C then rapidly cooled — preserves nutrients and reduces microbes.‌​‍

Answer

Pressure

Answer

Freezing

Answer

UV light

Question 10

Prokaryotic cells lack:‌​‍

Accepted Answer

Membrane-bound nucleus and organelles — Bacteria, archaea. ‌​‍Have 70S ribosomes. Circular DNA in nucleoid. ‌​‍No ER, Golgi, mitochondria.

Answer

DNA

Answer

Cell wall

Answer

Ribosomes

VFA Mixed Practice Test #567