Plus 2 Lecturer Mixed Practice Test #247

Question 1

What did the Miller-Urey experiment (1953) demonstrate?‌​‍

Accepted Answer

Abiotic synthesis of amino acids from inorganic gases — NH₃, CH₄, H₂, H₂O + spark → amino acids. ‌​‍Supports Oparin-Haldane hypothesis of chemical evolution.

Answer

Antibiotics

Answer

DNA structure

Answer

Cloning

Question 2

The peripheral nervous system (PNS) consists of:

Accepted Answer

B. Cranial nerves and spinal nerves — The peripheral nervous system (PNS) comprises all the nerves outside the brain and spinal cord, including the cranial nerves (originating from the brain) and spinal nerves (originating from the spinal cord), which transmit information to and from the central nervous system. The brain and spinal cord form the central nervous system (CNS), while the autonomic and somatic nervous systems are divisions *within* the PNS.

Answer

A. Brain and spinal cord

Answer

C. Cerebrum and cerebellum

Answer

D. Autonomic and somatic nervous systems

Question 3

The First Five-Year Plan (1951-56) focused on:‌​‍

Accepted Answer

Agriculture and irrigation — 1st FYP based on Harrod-Domar model, focused on agricultural revival and irrigation — post-Bengal famine reconstruction priority.‌​‍

Answer

Services

Answer

Defence

Answer

Heavy industry

Question 4

A teacher observes students conducting an experiment to investigate the properties of different liquids. They are collecting data, making observations, and formulating initial hypotheses without direct instruction on the concepts. Which phase of the 5E model are the students currently in, and what is its primary purpose?

Accepted Answer

C. Explore; to allow students to investigate phenomena and build experiences. — The Explore phase is characterized by students' hands-on investigation of a phenomenon, allowing them to gather data and build experiences before formal concepts are introduced. Elaborate extends learning, Explain introduces concepts, and Engage hooks interest and accesses prior knowledge.

Answer

A. Elaborate; to extend understanding to new contexts.

Answer

B. Explain; to introduce formal concepts and definitions.

Answer

D. Engage; to activate prior knowledge and create interest.

Question 5

Number of amino acids coded by 64 codons:‌​‍

Accepted Answer

20 (with some redundancy — several codons per amino acid) — Degeneracy: leucine, serine, arginine have 6 codons each. ‌​‍Wobble hypothesis explains tRNA flexibility.

Answer

100

Answer

64

Answer

10

Question 6

Myopia corrected by:‌​‍

Accepted Answer

Concave — Concave (diverging) lens.‌​‍

Answer

Convex

Answer

Bifocal

Answer

Cylindrical

Question 7

India's national animal is:

Accepted Answer

Tiger — The Royal Bengal Tiger (Panthera tigris) is India's national animal (since 1972).

Answer

Lion

Answer

Elephant

Answer

Peacock

Question 8

'Every cloud has a silver lining' means:

Accepted Answer

Every bad situation has some positive aspect — Proverb: look for the good in every bad situation.

Answer

It will rain

Answer

Clouds are white

Answer

You need an umbrella

Question 9

Best conductor of electricity:‌​‍

Accepted Answer

Silver — Silver. Copper is 2nd (and cheaper, so more used).‌​‍

Answer

Copper

Answer

Gold

Answer

Aluminium

Question 10

A point (−3, 4) lies in which quadrant?

Accepted Answer

II — Quadrant II: x negative, y positive.

Answer

I

Answer

III

Answer

IV

Plus 2 Lecturer Mixed Practice Test #247