VFA Mixed Practice Test #568

Question 1

The scientific study of living organisms is called:‌​‍

Accepted Answer

Biology — Biology (Greek bios=life, logos=study) — the science of life.‌​‍

Answer

Psychology

Answer

Geology

Answer

Sociology

Question 2

Work done is defined as the product of:

Accepted Answer

Force and displacement in direction of force — Work = F × s × cos θ; SI unit is Joule (J).

Answer

Force and time

Answer

Mass and acceleration

Answer

Power and time

Question 3

Aikya Kerala movement culminated on which date with Kerala's formation?

Accepted Answer

1 November 1956 — Kerala State came into existence on 1 November 1956 under States Reorganisation Act.

Answer

15 August 1947

Answer

1 July 1949

Answer

26 January 1950

Question 4

Kerala's first bird sanctuary:‌​‍

Accepted Answer

Thattekad — Thattekad Bird Sanctuary (1983).‌​‍

Answer

Kadalundi

Answer

Mangalavanam

Answer

Kumarakom

Question 5

Refractive index of water is approximately:

Accepted Answer

1.33 — n_water ≈ 1.33; diamond ~2.42; glass ~1.5.

Answer

1.00

Answer

1.50

Answer

2.42

Question 6

An optical fiber transmits light efficiently based on the principle of Total Internal Reflection (TIR). Which of the following conditions is most essential for TIR to occur when light travels from the core (denser medium) to the cladding (rarer medium) of an optical fiber?

Accepted Answer

C. The angle of incidence must be greater than the critical angle. — Total Internal Reflection (TIR) occurs when two conditions are met: first, light must travel from an optically denser medium to an optically rarer medium. Second, the angle of incidence in the denser medium must be greater than the critical angle. If the angle of incidence is less than the critical angle, refraction will occur, and light will pass into the rarer medium. The angle of refraction being 90 degrees defines the critical angle itself, not the condition for TIR.

Answer

A. The angle of incidence must be less than the critical angle.

Answer

B. The angle of refraction must be exactly 90 degrees.

Answer

D. The refractive index of the cladding must be greater than that of the core.

Question 7

Which of the following soil types in Kerala is predominantly formed by the weathering of lateritic rocks and is known for its high iron oxide content, making it suitable for cashew and rubber cultivation?

Accepted Answer

B. Laterite Soil — Laterite soil, formed by the weathering of lateritic rocks, is rich in iron oxide and aluminum oxide, making it acidic and well-drained. It is ideal for plantations like cashew and rubber in Kerala, unlike alluvial soil (fertile but not iron-rich), black soil (clayey and expansive), or red soil (iron-rich but less weathered).

Answer

A. Alluvial Soil

Answer

C. Black Soil

Answer

D. Red Soil

Question 8

An element 'X' is characterized by an extremely high first ionization energy and a general inertness towards chemical reactions under standard conditions. Element 'Y', located in the same period as 'X', exhibits a very low first ionization energy and is highly reactive, readily forming cations. Which of the following conclusions can be drawn about elements X and Y based on their periodic positions and properties?

Accepted Answer

C. Element X is a noble gas, and Element Y is an alkali metal. — Noble gases (Group 18) possess full valence shells, resulting in exceptionally high ionization energies and chemical inertness, fitting the description of element X. Alkali metals (Group 1) have only one valence electron, leading to very low ionization energies and high reactivity to form +1 cations, matching element Y. Other options describe elements with different ionization energy characteristics or reactivity patterns that do not align with the extreme properties given for X and Y.

Answer

A. Element X is a transition metal, and Element Y is a Group 14 element.

Answer

B. Element X is a non-metal from Group 15, and Element Y is a metal from Group 13.

Answer

D. Element X is a halogen, and Element Y is an alkaline earth metal.

Question 9

The first man to walk on the Moon was:‌​‍

Accepted Answer

Neil Armstrong — Neil Armstrong was the first man to walk on the Moon on 20 July 1969 during NASA's Apollo 11 mission. ‌​‍His famous words: 'One small step for man, one giant leap for mankind.'

Answer

Yuri Gagarin

Answer

Buzz Aldrin

Answer

Michael Collins

Question 10

Albinism:‌​‍

Accepted Answer

Lack of melanin — Genetic melanin deficiency.‌​‍

Answer

Vitamin deficiency

Answer

Excess melanin

Answer

Protein

VFA Mixed Practice Test #568