LGS Mixed Practice Test #623

Question 1

Dialysis replaces function of:‌​‍

Accepted Answer

Kidney — Artificial kidney filtration.‌​‍

Answer

Heart

Answer

Lung

Answer

Liver

Question 2

Digital Personal Data Protection Act:‌​‍

Accepted Answer

2023 — Passed August 2023. India's data protection law.‌​‍

Answer

Not yet

Answer

2024

Answer

2022

Question 3

Which of the following statements is INCORRECT regarding the membership and objectives of BRICS?

Accepted Answer

D. BRICS has a permanent secretariat located in New Delhi, India, to coordinate its activities. — The BRICS group does not have a permanent secretariat; instead, its coordination rotates among member countries. Options A, B, and C are correct as they accurately describe the formation, expansion, and goals of BRICS.

Answer

A. BRICS was established in 2006 with an initial focus on economic cooperation.

Answer

B. South Africa joined BRICS in 2010, becoming the first African member of the group.

Answer

C. One of the key objectives of BRICS is to reform global financial institutions to better represent developing economies.

Question 4

Iodized salt contains:‌​‍

Accepted Answer

KIO3 or KI — Potassium iodate or iodide.‌​‍

Answer

Ca

Answer

Mg

Answer

NaF

Question 5

Brewster's angle:‌​‍

Accepted Answer

Angle at which refracted ray is perpendicular to reflected; reflected is fully polarised — tan θB = n₂/n₁. ‌​‍For glass-air θB ≈ 57°. Polarising sunglasses use this principle.

Answer

45°

Answer

Critical angle

Answer

Zero

Question 6

The number of permanent members in the UN Security Council is:‌​‍

Accepted Answer

5 — 5 permanent members (P5) with veto: USA, Russia, China, France, UK.‌​‍

Answer

3

Answer

10

Answer

15

Question 7

The hardest substance in the human body is:‌​‍

Accepted Answer

Enamel — Tooth enamel (mostly hydroxyapatite) is harder than bone.‌​‍

Answer

Dentine

Answer

Bone

Answer

Cartilage

Question 8

CRISPR is related to:‌​‍

Accepted Answer

Gene editing — CRISPR-Cas9 is a revolutionary gene-editing technology that can modify DNA sequences.‌​‍

Answer

Computing

Answer

Space travel

Answer

Robotics

Question 9

Which of the following structures is primarily responsible for the exchange of gases between the blood and alveoli in the lungs?

Accepted Answer

C. Alveolar sacs — Alveolar sacs are the primary sites for gas exchange due to their thin walls and extensive capillary network. Bronchi and trachea are conducting airways, while bronchioles lead to alveoli but are not the primary exchange sites.

Answer

A. Bronchi

Answer

B. Bronchioles

Answer

D. Trachea

Question 10

In situations where a safe and reliable drinking water source is unavailable, boiling water is a common recommendation for purification. What is the primary mechanism by which boiling makes water safe for consumption?

Accepted Answer

C. It kills most pathogenic microorganisms, including bacteria, viruses, and parasites. — Boiling water to a rolling boil for at least one minute is highly effective at killing most disease-causing bacteria, viruses, and parasites, thereby preventing waterborne illnesses. It does not remove chemical pollutants or heavy metals, nor does it primarily enhance mineral content or remove suspended solids (though it can help with some). Its main benefit is microbiological purification.

Answer

A. It effectively removes heavy metals and chemical pollutants.

Answer

B. It enhances the water's mineral content, making it healthier.

Answer

D. It improves the aesthetic qualities of water by removing suspended solids.

LGS Mixed Practice Test #623