While the entire human skull consists of 22 bones (8 cranial and 14 facial), primary educational curricula frequently ask specifically for the 14 facial bones. The official exam key marks 14 as the correct answer.
17. Lime stone is a type of:
(A) Igneous rock
(B) Metamorphic rock
(C) Sedimentary rock
(D) None of these
Answer:
(C) Sedimentary rock
Explanation:
Limestone is a common type of sedimentary rock, composed primarily of skeletal fragments of marine organisms like coral and mollusks.
18. Total No. of bones in human body.
(A) 306
(B) 206
(C) 305
(D) 205
Answer:
(B) 206
Explanation:
The adult human skeleton is composed of exactly 206 bones (babies are born with more, but they fuse together over time).
19. Deficiency of vitamin D causes:
(A) Rickets
(B) Scurvy
(C) Anaemia
(D) Goitre
Answer:
(A) Rickets
Explanation:
Rickets is a childhood bone disorder characterized by softening and weakening of the bones, directly caused by a prolonged deficiency of Vitamin D, which is essential for calcium absorption.
20. The largest continent of the Earth:
(A) Europe
(B) Australia
(C) Asia
(D) Africa
Answer:
(C) Asia
Explanation:
Asia is the world’s largest and most populous continent, covering approximately 30% of Earth’s total land area.
