Plus 2 Lecturer Mixed Practice Test #963

Question 1

Bohr's radius of hydrogen ground state:‌​‍

Accepted Answer

~0.53 Å (0.0529 nm) — a₀ = ε₀h²/(πme²) = 0.529 × 10⁻¹⁰ m. ‌​‍nth orbit: rn = n²a₀/Z. Energy: En = -13.6Z²/n² eV.

Answer

~1 m

Answer

~1 nm

Answer

~10⁻¹⁵ m

Question 2

Pseudo forces appear in:‌​‍

Accepted Answer

Non-inertial frames — E.g. ‌​‍centrifugal force in rotating frame, Coriolis force. Added to apply F=ma in accelerating frames.

Answer

Rest frames

Answer

All frames

Answer

Inertial frames

Question 3

A high school teacher observes that a group of 15-year-old students has formed a tight-knit clique, adopting a distinct fashion style, slang, and shared interests, often preferring to spend time with each other over family activities. This behavior is most indicative of which key aspect of adolescent social development?

Accepted Answer

C. The strong need for peer acceptance and identity formation — During adolescence, the peer group becomes increasingly central to an individual's social world and identity formation. Adolescents actively seek peer acceptance, establish their social standing, and often conform to group norms as a means of exploring and defining their own identity separate from their family.

Answer

A. Regression to earlier forms of egocentric play

Answer

B. The primary influence of parental authority diminishing

Answer

D. A developing disinterest in future career planning

Question 4

Chlorophyll absorbs mainly:‌​‍

Accepted Answer

Red and blue light — Chlorophyll absorbs red and blue light, reflects green — which is why plants appear green.‌​‍

Answer

Green light

Answer

Yellow light

Answer

All colours equally

Question 5

A redox reaction always involves:

Accepted Answer

Both oxidation and reduction occurring together — Electrons lost by one species are gained by another — simultaneous process.

Answer

Oxidation only

Answer

Reduction only

Answer

Neither

Question 6

Olympic Games 2028 host:‌​‍

Accepted Answer

LA — Los Angeles hosts Summer Olympics 2028.‌​‍

Answer

Sydney

Answer

Paris

Answer

Brisbane

Question 7

According to Piaget's theory of cognitive development, which stage is characterized by the development of abstract thinking and hypothetical reasoning?

Accepted Answer

D. Formal operational stage — The formal operational stage (12 years and above) is when individuals develop the ability to think abstractly, reason logically, and consider hypothetical scenarios. The sensorimotor stage focuses on sensory and motor skills, the preoperational stage on symbolic thought, and the concrete operational stage on logical thinking about concrete objects.

Answer

A. Sensorimotor stage

Answer

B. Preoperational stage

Answer

C. Concrete operational stage

Question 8

Antonym of SAME:

Accepted Answer

Different — Same ↔ different.

Answer

Similar

Answer

Identical

Answer

Alike

Question 9

The laws of motion were given by:‌​‍

Accepted Answer

Isaac Newton — Sir Isaac Newton formulated the three laws of motion (published in Principia, 1687).‌​‍

Answer

Einstein

Answer

Galileo

Answer

Kepler

Question 10

The author of 'Wings of Fire' autobiography is:

Accepted Answer

A. P. J. Abdul Kalam — 'Wings of Fire: An Autobiography' (1999) by A. P. J. Abdul Kalam with Arun Tiwari.

Answer

Nelson Mandela

Answer

Malala Yousafzai

Answer

Nehru

Plus 2 Lecturer Mixed Practice Test #963