LGS Mixed Practice Test #231

Question 1

Which gas is evolved when dilute HCl reacts with zinc?

Accepted Answer

H₂ — Zn + 2HCl → ZnCl₂ + H₂↑.

Answer

O₂

Answer

Cl₂

Answer

CO₂

Question 2

An adolescent is known for making impulsive decisions and engaging in risky behaviors without fully considering the long-term consequences. From a neurodevelopmental perspective, this tendency is often attributed to the continued maturation of which part of the brain during adolescence?

Accepted Answer

C. Prefrontal cortex — The prefrontal cortex, responsible for executive functions like planning, impulse control, and risk assessment, undergoes significant maturation throughout adolescence, making teenagers more prone to impulsive and risky behaviors before it is fully developed. While the amygdala is involved in emotions, its *full maturation* is not the primary reason for this characteristic impulsivity.

Answer

A. Cerebellum

Answer

B. Brainstem

Answer

D. Amygdala (fully mature)

Question 3

The loudness of sound is measured in:‌​‍

Accepted Answer

Decibel (dB) — Decibel is a logarithmic unit: 10 dB = whisper, 90 dB = traffic, 120+ dB = pain.‌​‍

Answer

Watt

Answer

Joule

Answer

Hertz

Question 4

Contact process produces:‌​‍

Accepted Answer

H₂SO₄ (SO₂ → SO₃ → oleum → H₂SO₄) — V₂O₅ catalyst for SO₂ + ½O₂ → SO₃. Ostwald process makes HNO₃.‌​‍

Answer

HNO₃

Answer

HCl

Answer

NH₃

Question 5

Republic Day 2024 chief guest:‌​‍

Accepted Answer

Macron — President Emmanuel Macron.‌​‍

Answer

Modi

Answer

Biden

Answer

Putin

Question 6

This is the place ___ I live. (suitable relative pronoun)

Accepted Answer

Where — 'Where' is used for places.

Answer

When

Answer

What

Answer

Who

Question 7

Mirage is caused by:‌​‍

Accepted Answer

Refraction and total internal reflection of light in air layers of different densities — Hot air near the ground has lower density; light bends and undergoes TIR creating the illusion.‌​‍

Answer

Dispersion

Answer

Reflection from the ground

Answer

Diffraction

Question 8

A teacher notices that some students in her class struggle with abstract mathematical concepts, while others grasp them quickly. To address this disparity and provide differentiated instruction using technology, which approach would be most effective?

Accepted Answer

B. Using an educational app that offers adaptive learning paths and personalized feedback based on student performance. — An educational app offering adaptive learning paths and personalized feedback (Option B) is highly effective for differentiated instruction. It allows students to work at their own pace, receive targeted support, and progress through content tailored to their individual needs. Generic tutorials (A), whole-class discussions (C), or standard digital worksheets (D) do not effectively cater to individual learning differences and paces.

Answer

A. Providing all students with links to generic online math tutorials.

Answer

C. Projecting complex math problems onto a screen for whole-class discussion.

Answer

D. Assigning all students to complete a digital worksheet with standard problems.

Question 9

Sickle-cell anaemia is a:‌​‍

Accepted Answer

Genetic disorder affecting haemoglobin — Sickle-cell anaemia results from a point mutation in β-globin gene causing HbS.‌​‍

Answer

Bacterial infection

Answer

Nutritional problem

Answer

Vitamin deficiency

Question 10

What was the original name of Thycaud Ayya?

Accepted Answer

Subbarayan — Subbarayan was the original name of Thycaud Ayya Swami.

Answer

Kunjikannan

Answer

Mudisoodum Perumal

Answer

Muthukutty

LGS Mixed Practice Test #231