VFA Mixed Practice Test #738

Question 1

Coelenterates (Cnidaria):‌​‍

Accepted Answer

Jellyfish, corals — Jellyfish, corals — stinging cells.‌​‍

Answer

Sponges

Answer

Fish

Answer

Starfish

Question 2

The process by which a solid directly changes to gas without passing through liquid is called:‌​‍

Accepted Answer

Sublimation — Camphor, naphthalene, iodine, dry ice sublime at room conditions.‌​‍

Answer

Evaporation

Answer

Condensation

Answer

Deposition

Question 3

Wayanad is the only district without:‌​‍

Accepted Answer

Coastline — Wayanad is the only Kerala district without a coastline — it is an inland hill district.‌​‍

Answer

Mountains

Answer

Rivers

Answer

Forests

Question 4

The Palakkad Gap is a pass through the:‌​‍

Accepted Answer

Western Ghats — Palakkad Gap is the only significant break in the Western Ghats, connecting Kerala with Tamil Nadu. ‌​‍It is about 30 km wide.

Answer

Himalayas

Answer

Eastern Ghats

Answer

Vindhya Range

Question 5

Which of the following is the first indigenous vaccine developed in India?

Accepted Answer

C. Rotavac — Rotavac, developed by the Serum Institute of India in collaboration with the Indian government, is the first indigenous vaccine against rotavirus diarrhea in India, approved for use in 2014. BCG vaccine was developed earlier but not indigenously in India. OPV was introduced in India but is not indigenous. PCV is a more recent vaccine and not the first indigenous one.

Answer

A. BCG vaccine

Answer

B. Oral Polio Vaccine (OPV)

Answer

D. Pneumococcal Conjugate Vaccine (PCV)

Question 6

A lunar eclipse occurs when:‌​‍

Accepted Answer

Earth is between Sun and Moon — Lunar eclipse occurs at full moon when Earth's shadow falls on the Moon.‌​‍

Answer

Moon crosses Venus

Answer

Moon is between Sun and Earth

Answer

Sun blocks Moon directly

Question 7

Kerala's west-flowing rivers are crucial for the state's ecology and economy. However, their characteristics make them particularly vulnerable to certain environmental challenges. Which of the following is the most significant environmental challenge faced by these rivers due to their inherent nature?

Accepted Answer

B. High susceptibility to pollution from industrial and urban waste coupled with low dilution capacity during lean seasons. — Kerala's west-flowing rivers are relatively short, have steep gradients, and are predominantly monsoon-fed, leading to significant fluctuations in water volume. During the lean seasons, their reduced flow significantly lowers their dilution capacity, making them highly susceptible to pollution from the dense urban and industrial settlements along their banks. While hydroelectric potential exists due to steep gradients and salinization occurs in lower reaches, pollution due to low dilution is the most pervasive and significant challenge.

Answer

A. Limited potential for hydroelectric power generation due to their short length and steep gradient.

Answer

C. Excessive siltation and delta formation at their mouths, causing navigation difficulties for large vessels.

Answer

D. Rapid salinization of their upper reaches due to tidal ingress from the Arabian Sea throughout the year.

Question 8

White phosphorus differs from red phosphorus in that white P is:‌​‍

Accepted Answer

Toxic and spontaneously combustible in air — White P (P₄) is stored under water; red P is stable and used in matches.‌​‍

Answer

Used in matchsticks

Answer

A polymer

Answer

Stable in air

Question 9

What is the capital of Brazil?‌​‍

Accepted Answer

Brasilia — Brasilia — capital since 1960.‌​‍

Answer

Sao Paulo

Answer

Salvador

Answer

Rio de Janeiro

Question 10

The mirror in a torch is:‌​‍

Accepted Answer

Concave — Concave mirror produces focused beam.‌​‍

Answer

Plane

Answer

Convex

Answer

Cylindrical

VFA Mixed Practice Test #738