60. Which of the following elements of the human skeletal framework is classified as the smallest individual bone in the human body?
[SSC Selection Post (Graduate), 17 September 2026, Shift 1]
(a) Scapula bone
(b) Rib cage
(c) Stapes bone
(d) Coxal bone
Answer: (c) Stapes bone
Explanation: The stapes is a tiny stirrup-shaped auditory ossicle in the middle ear. It conveys vibrations from the incus to the oval window. In contrast, the femur is the longest human bone, while the rib cage comprises multiple bones.
59. A football player tears a structure that connects muscles to bones during practice. Which structure is most likely damaged?
[RRB Group D, 18 August 2026, Shift 3]
(a) Tendon
(b) Ligament
(c) Cartilage
(d) Nerve
Answer: (a) Tendon
Explanation: Tendons are strong collagen-rich bands attaching skeletal muscles to bones. They transmit muscular pulling force to produce joint movement. Ligaments instead connect bones to other bones, while cartilage cushions and supports joints and nerves carry electrical signals.
58. The cells of the cartilage are known as ________.
[RRB Group D, 9 August 2026, Shift 2]
(a) Fibroblasts
(b) Osteocytes
(c) Chondrocytes
(d) Adipocytes
Answer: (c) Chondrocytes
Explanation: Chondrocytes are mature cartilage cells situated in spaces called lacunae. They manufacture and maintain a matrix rich in collagen and proteoglycans. Osteocytes maintain bone, fibroblasts make connective-tissue fibres, and adipocytes mainly store fat.
57. Smooth muscles are responsible for all the following actions, EXCEPT:
[RRB Group D, 6 August 2026, Shift 2]
(a) Lifting a heavy bucket of water
(b) Regular movements in the intestines
(c) Moving food through the digestive tract
(d) Functioning automatically without conscious thought
Answer: (a) Lifting a heavy bucket of water
Explanation: Lifting a heavy bucket primarily recruits voluntary skeletal muscles, including muscles of the arms, shoulders and trunk. Smooth muscles are involuntary and produce rhythmic intestinal movements and peristalsis. Their contraction is controlled mainly by autonomic mechanisms.
56. Which of the following correctly differentiates ligament from tendon in human connective tissue?
[RRB Technician Grade III, 10 March 2026, Shift 1]
(a) Ligament connects bone to bone; tendon connects muscle to bone
(b) Both ligament and tendon connect bones to bones but differ in colour
(c) Ligament connects muscle to bone, while tendon connects bone to bone
(d) Tendon is elastic, while ligament is completely non-elastic
Answer: (a) Ligament connects bone to bone; tendon connects muscle to bone
Explanation: Ligaments stabilize a joint by linking adjacent bones. Tendons link muscles to bones and transmit contractile force. Both contain collagen, but their arrangement and elasticity vary according to function. Reversing their anatomical connections is a common examination trap.
55. Which type of action is heartbeat?
[SSC GD Constable, 29 April 2026, Shift 1]
(a) Reflex action
(b) Involuntary action
(c) Voluntary action
(d) Coordinated action
Answer: (b) Involuntary action
Explanation: Heartbeat occurs without conscious direction because cardiac muscle contracts rhythmically through its intrinsic pacemaker system. The autonomic nervous system modifies its rate and strength. Unlike skeletal muscles used for deliberate movements, the myocardium operates automatically throughout life.
54. In humans, rings of cartilage are present in the ___.
[SSC MTS, 5 February 2026, Shift 3]
(a) Stomach
(b) Mouth
(c) Ear
(d) Throat
Answer: (d) Throat
Explanation: The trachea, passing through the neck or throat, is supported by C-shaped hyaline cartilage rings. They prevent airway collapse during breathing while leaving the posterior wall flexible enough to accommodate expansion of the adjacent oesophagus during swallowing.
53. What is the role of peristaltic movements in the human digestive system?
[RRB Group D, 10 February 2026, Shift 2]
(a) To produce digestive enzymes
(b) To digest proteins in the stomach
(c) To absorb nutrients into the blood
(d) To push food forward along the digestive tract
Answer: (d) To push food forward along the digestive tract
Explanation: Peristalsis consists of coordinated waves of contraction and relaxation in smooth muscle layers of the digestive tract. These involuntary movements propel food and chyme forwards. They are distinct from enzyme secretion, chemical digestion and intestinal nutrient absorption.
52. Which type of muscular tissue is present in the wall of the stomach?
[RRB Group D, 26 December 2025, Shift 3]
(a) Smooth muscle tissue
(b) Skeletal muscle tissue
(c) Cardiac muscle tissue
(d) Fluid connective tissue
Answer: (a) Smooth muscle tissue
Explanation: The stomach wall contains layers of involuntary smooth muscle that churn food and mix it with gastric secretions. Skeletal muscle generally produces voluntary body movements; cardiac muscle forms the heart wall. Smooth muscle cells lack the obvious striations of skeletal muscle.
51. Which of the following axial skeleton pairs in humans is NOT correctly matched?
[DSSSB TGT Natural Science, 6 September 2025, Shift 2]
(a) Facial bones – Mandible
(b) Thoracic cage – Sternum
(c) Auditory ossicles – Sacrum
(d) Cranial bones – Parietal
Answer: (c) Auditory ossicles – Sacrum
Explanation: The sacrum is a fused bone at the lower end of the vertebral column, not an auditory ossicle. The auditory ossicles are the malleus, incus and stapes in each middle ear. The other listed anatomical pairings are correct.