LGS Mixed Practice Test #823

Question 1

Optical fibre transmission works on:‌​‍

Accepted Answer

Total internal reflection — Core (higher n) surrounded by cladding (lower n). ‌​‍Light bounces along the core. Used in internet, medical imaging.

Answer

Absorption

Answer

Refraction

Answer

Diffraction

Question 2

Which disease is caused by the deficiency of Vitamin D?‌​‍

Accepted Answer

Rickets — Rickets (in children) and Osteomalacia (in adults) are caused by Vitamin D deficiency. ‌​‍Vitamin D is obtained from sunlight and helps in calcium absorption.

Answer

Scurvy

Answer

Beriberi

Answer

Night Blindness

Question 3

Steroid hormones, such as cortisol and estrogen, typically exert their effects by binding to which type of receptor?

Accepted Answer

B. Intracellular receptors — Steroid hormones are lipid-soluble and can readily cross cell membranes. They bind to specific intracellular receptors in the cytoplasm or nucleus, which then act as transcription factors to regulate gene expression. Other receptor types are typically for water-soluble hormones or neurotransmitters.

Answer

A. G-protein coupled receptors (GPCRs)

Answer

C. Ligand-gated ion channels

Answer

D. Receptor tyrosine kinases

Question 4

Opposite of North-East:

Accepted Answer

South-West — SW is opposite of NE.

Answer

North-West

Answer

South-East

Answer

West

Question 5

Hydrogen bonding is strongest in:‌​‍

Accepted Answer

HF — H bonded to highly electronegative F, O, or N. ‌​‍Explains high b.p. of water, NH₃, HF compared to heavier analogues.

Answer

HCl

Answer

HI

Answer

HBr

Question 6

Which statement is NOT correct? ‌​‍(1) Reign of Terror — French Revolution (2) Bloody Sunday — American Revolution (3) Glorious Revolution in England in 1688 (4) Nationalist Revolution in China in 1949

Accepted Answer

Only (2, 4) — Bloody Sunday (1905) was Russian, not American. ‌​‍China's Nationalist Revolution was 1911 (Xinhai); 1949 was the Communist victory.

Answer

All incorrect

Answer

Only (3)

Answer

Only (1, 3)

Question 7

Pampa Valley dam:‌​‍

Accepted Answer

Sabarigiri — Sabarigiri hydroelectric project.‌​‍

Answer

Kakki

Answer

Pamba Dam

Answer

Idukki

Question 8

Aditya-L1 reached L1 point in:‌​‍

Accepted Answer

Jan 2024 — Reached Lagrange point 1 on 6 January 2024.‌​‍

Answer

Nov 2023

Answer

Feb 2024

Answer

Dec 2023

Question 9

The hip joint is a:

Accepted Answer

Ball-and-socket joint — Hip and shoulder are ball-and-socket joints allowing rotation.

Answer

Hinge joint

Answer

Pivot joint

Answer

Gliding joint

Question 10

Nobel Peace Prize 2024 was awarded to:‌​‍

Accepted Answer

Nihon Hidankyo — Nihon Hidankyo, the Japanese organisation of atomic bomb survivors (Hibakusha), won the 2024 Nobel Peace Prize.‌​‍

Answer

IPCC

Answer

UNHCR

Answer

World Food Programme

LGS Mixed Practice Test #823