VFA Mixed Practice Test #644

Question 1

Which hormone stimulates milk ejection during breastfeeding?‌​‍

Accepted Answer

Oxytocin — Oxytocin (posterior pituitary) triggers milk let-down reflex and uterine contractions during childbirth.‌​‍

Answer

Prolactin

Answer

Progesterone

Answer

Estrogen

Question 2

The Declaration of Independence (USA) was primarily drafted by:‌​‍

Accepted Answer

Thomas Jefferson — Thomas Jefferson drafted (June 1776); revised by Franklin, Adams, Livingston, Sherman. ‌​‍Adopted 4 July 1776.

Answer

John Adams

Answer

Benjamin Franklin

Answer

George Washington

Question 3

Which of the following drugs is derived from the latex of a plant and used as a purgative?

Accepted Answer

C. Aloin — Aloin is a purgative obtained from the latex of Aloe barbadensis (Aloe vera). Opium is from Papaver somniferum, colchicine from Colchicum autumnale, and quinine from Cinchona bark.

Answer

A. Opium

Answer

B. Colchicine

Answer

D. Quinine

Question 4

The colour of sky appears blue due to:‌​‍

Accepted Answer

Rayleigh scattering of sunlight by atmospheric molecules — Shorter wavelengths (blue) scatter more than longer (red) — hence blue sky.‌​‍

Answer

Refraction

Answer

Absorption

Answer

Reflection of sea

Question 5

Steroid hormones, such as cortisol and estrogen, typically exert their effects by binding to which type of receptor?

Accepted Answer

B. Intracellular receptors — Steroid hormones are lipid-soluble and can readily cross cell membranes. They bind to specific intracellular receptors in the cytoplasm or nucleus, which then act as transcription factors to regulate gene expression. Other receptor types are typically for water-soluble hormones or neurotransmitters.

Answer

A. G-protein coupled receptors (GPCRs)

Answer

C. Ligand-gated ion channels

Answer

D. Receptor tyrosine kinases

Question 6

A teacher wants to create an interactive learning module using ICT. Which tool would be most effective for assessing students' real-time understanding in a digital format?

Accepted Answer

B. Learning Management System (LMS) with quiz features — While all options have educational value, an LMS with quiz features allows for real-time assessment of students' understanding through quizzes and feedback mechanisms, which is the most direct method for evaluating comprehension digitally.

Answer

A. Digital whiteboard for live demonstrations

Answer

C. Video conferencing tools for synchronous discussions

Answer

D. E-books for self-paced reading

Question 7

Purines in DNA:‌​‍

Accepted Answer

A and G — Double-ring. ‌​‍Pyrimidines (single-ring): C, T (in DNA), U (in RNA). Chargaff's rule: A=T, G=C.

Answer

Only A

Answer

C and T

Answer

A and T

Question 8

The greenhouse effect is:‌​‍

Accepted Answer

Natural and necessary for life, but enhanced by human activity — Natural greenhouse effect keeps Earth warm enough for life. ‌​‍Human activities enhance it, causing dangerous warming.

Answer

Bad for all life

Answer

Only caused by humans

Answer

Happening on Mars only

Question 9

The temperature at which a liquid's vapour pressure equals atmospheric pressure is called:‌​‍

Accepted Answer

Boiling point — Boiling occurs when vapour pressure = ambient atmospheric pressure.‌​‍

Answer

Melting point

Answer

Condensation point

Answer

Freezing point

Question 10

The International Court of Justice (ICJ) is the principal judicial organ of the United Nations. Which of the following cases would the ICJ be most likely to hear?

Accepted Answer

D. A boundary dispute between two states that are parties to the ICJ Statute. — Option D is correct because the ICJ primarily hears disputes between states (as per Article 36 of the ICJ Statute). Option A is unlikely as trade disputes are typically handled by specialized tribunals like the WTO. Option B falls under domestic jurisdiction unless the state has accepted ICJ jurisdiction. Option C is not an ICJ mandate, as extradition is handled through bilateral treaties or international conventions.

Answer

A. A dispute between two countries over the interpretation of a bilateral trade agreement.

Answer

B. A claim by a private citizen against their own government for human rights violations.

Answer

C. A case involving the extradition of a fugitive from one country to another.

VFA Mixed Practice Test #644