Q. 1
Physical Education
Difficulty: Easy
(1 Mark)
How many total bones comprise the adult human skeleton?
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Step-by-Step Explanation & Concept Rationale
An adult human skeleton consists of 206 bones, divided into the axial skeleton (80 bones) and the appendicular skeleton (126 bones).
Q. 2
Physical Education
Difficulty: Easy
(1 Mark)
Which bone is the longest, heaviest, and strongest bone in the human body?
💡
Step-by-Step Explanation & Concept Rationale
The femur is the longest and strongest human bone, supporting upright body weight and transmitting forces generated during running and jumping.
Q. 3
Physical Education
Difficulty: Easy
(1 Mark)
The Patella (kneecap) is anatomically classified as which type of bone?
💡
Step-by-Step Explanation & Concept Rationale
The patella is the largest sesamoid bone in the body, embedded within the quadriceps tendon to increase the mechanical leverage of the knee extensor mechanism.
Q. 4
Physical Education
Difficulty: Easy
(1 Mark)
Which anatomical joint classification provides the greatest range of multi-axial motion (e.g., shoulder and hip joints)?
💡
Step-by-Step Explanation & Concept Rationale
Ball and socket synovial joints permit movement across all three planes (flexion/extension, abduction/adduction, internal/external rotation, and circumduction).
Q. 5
Physical Education
Difficulty: Easy
(1 Mark)
The knee and elbow joints are functional examples of which type of synovial joint?
💡
Step-by-Step Explanation & Concept Rationale
Hinge joints (ginglymus) permit movement primarily in a single uniaxial plane (flexion and extension).
Q. 6
Physical Education
Difficulty: Easy
(1 Mark)
According to the Sliding Filament Theory of muscle contraction, which two protein filaments interact to generate cross-bridge tension?
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Step-by-Step Explanation & Concept Rationale
Myosin heads bind to actin filaments in the presence of calcium ions and ATP, pulling actin inward toward the M-line to shorten the sarcomere.
Q. 7
Physical Education
Difficulty: Medium
(1 Mark)
Type I skeletal muscle fibers are physiologically characterized as:
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Step-by-Step Explanation & Concept Rationale
Type I slow-twitch fibers are rich in myoglobin, mitochondria, and capillary beds, making them highly efficient for sustained aerobic endurance events (marathons).
Q. 8
Physical Education
Difficulty: Medium
(1 Mark)
Type IIx (fast-twitch glycolytic) muscle fibers are predominant in athletes specializing in:
💡
Step-by-Step Explanation & Concept Rationale
Type IIx fibers contract with high velocity and explosive force through anaerobic glycolysis, ideal for short, high-intensity bursts of power.
Q. 9
Physical Education
Difficulty: Medium
(1 Mark)
Which intracellular ion released from the sarcoplasmic reticulum binds to troponin to trigger cross-bridge cycling during muscle contraction?
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Step-by-Step Explanation & Concept Rationale
Action potentials trigger Ca2+ release from the sarcoplasmic reticulum; calcium binds to troponin C, causing tropomyosin to shift and uncover myosin binding sites on actin.
Q. 10
Physical Education
Difficulty: Easy
(1 Mark)
In functional kinesiology, the muscle primarily responsible for producing a specific movement is called the:
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Step-by-Step Explanation & Concept Rationale
The agonist (prime mover) contracts to produce the designated joint motion, while the antagonist relaxes or eccentrically controls the movement.
Q. 11
Physical Education
Difficulty: Easy
(1 Mark)
During elbow flexion (e.g., bicep curl), the biceps brachii acts as the agonist while the triceps brachii acts as the:
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Step-by-Step Explanation & Concept Rationale
The triceps opposes elbow flexion and must relax or eccentrically lengthen to allow smooth bicep contraction, acting as the antagonist.
Q. 12
Physical Education
Difficulty: Easy
(1 Mark)
Which muscle contraction involves tension development while the muscle length remains completely unchanged?
💡
Step-by-Step Explanation & Concept Rationale
In isometric contractions (e.g., pushing against an immovable wall, holding a plank), muscle tension rises without changing joint angle or muscle length.
Q. 13
Physical Education
Difficulty: Easy
(1 Mark)
Which type of muscle action involves active lengthening of the muscle while developing tension (e.g., lowering the weight in a squat)?
💡
Step-by-Step Explanation & Concept Rationale
Eccentric contractions occur when the muscle elongates under external load, generating high mechanical tension responsible for delayed-onset muscle soreness (DOMS).
Q. 14
Physical Education
Difficulty: Easy
(1 Mark)
Which immediate energy system powers high-intensity maximal efforts lasting 0 to 10 seconds (e.g., 100m sprint or heavy lift)?
💡
Step-by-Step Explanation & Concept Rationale
The phosphagen system utilizes stored muscular ATP and phosphocreatine (PCr) to rapidly re-phosphorylate ADP anaerobically without producing lactic acid.
Q. 15
Physical Education
Difficulty: Medium
(1 Mark)
What is the net gain of ATP molecules produced from the anaerobic breakdown of one molecule of glucose via fast glycolysis?
💡
Step-by-Step Explanation & Concept Rationale
Anaerobic glycolysis converts 1 molecule of glucose into 2 molecules of lactate, yielding a net of 2 ATP (or 3 ATP if starting from muscle glycogen).
Q. 16
Physical Education
Difficulty: Medium
(1 Mark)
In the presence of oxygen, complete aerobic metabolism of one glucose molecule yields approximately how many ATP molecules?
💡
Step-by-Step Explanation & Concept Rationale
Through glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain, complete aerobic oxidation of glucose produces ~30-32 ATP.
Q. 17
Physical Education
Difficulty: Easy
(1 Mark)
Cardiac Output (Q) is calculated using which physiological formula?
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Step-by-Step Explanation & Concept Rationale
Cardiac output ($Q$) is the volume of blood pumped by the left ventricle per minute, calculated as the product of Heart Rate (bpm) and Stroke Volume (mL/beat).
Q. 18
Physical Education
Difficulty: Easy
(1 Mark)
Athletic bradycardia, commonly observed in highly trained endurance athletes at rest, is characterized by a resting heart rate of:
💡
Step-by-Step Explanation & Concept Rationale
Endurance training induces physiological eccentric hypertrophy of the left ventricle and increased vagal tone, producing large stroke volume and resting bradycardia (< 60 bpm).
Q. 19
Physical Education
Difficulty: Easy
(1 Mark)
What physiological metric is universally regarded as the gold-standard measure of cardiorespiratory aerobic fitness?
💡
Step-by-Step Explanation & Concept Rationale
$ ext{VO}_2 ext{ max}$ (measured in mL/kg/min) is the maximal volume of oxygen the body can transport and utilize during exhaustive incremental exercise.
Q. 20
Physical Education
Difficulty: Medium
(1 Mark)
What physiological phenomenon explains the sustained elevation in oxygen consumption following intense exercise, previously termed 'oxygen debt'?
💡
Step-by-Step Explanation & Concept Rationale
EPOC represents elevated post-exercise metabolism to resynthesize ATP/PCr, clear lactate, replenish myoglobin/hemoglobin oxygen, and restore elevated body temperature.
Q. 21
Physical Education
Difficulty: Medium
(1 Mark)
The 'Lactate Threshold' (Anaerobic Threshold) in endurance exercise refers to the point where:
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Step-by-Step Explanation & Concept Rationale
The lactate threshold (typically at 50-60% $ ext{VO}_2 ext{ max}$ in untrained individuals and 70-85% in endurance athletes) marks the transition to heavy anaerobic reliance.
Q. 22
Physical Education
Difficulty: Easy
(1 Mark)
Which anatomical plane divides the human body into anterior (front) and posterior (back) halves?
💡
Step-by-Step Explanation & Concept Rationale
The frontal (coronal) plane bisects the body into ventral/anterior and dorsal/posterior portions; abduction and adduction occur in this plane.
Q. 23
Physical Education
Difficulty: Easy
(1 Mark)
Walking, running, and bicep curls primarily occur in which anatomical plane?
💡
Step-by-Step Explanation & Concept Rationale
The sagittal plane divides the body into left and right halves; movements of flexion and extension (running, squatting, curls) occur parallel to this plane.
Q. 24
Physical Education
Difficulty: Medium
(1 Mark)
In human biomechanics, rotational movements (such as swinging a baseball bat or pirouetting) occur around which anatomical axis?
💡
Step-by-Step Explanation & Concept Rationale
Transverse plane motions (internal/external rotation, horizontal abduction/adduction) rotate around the vertical (longitudinal) axis.
Q. 25
Physical Education
Difficulty: Medium
(1 Mark)
Most skeletal muscle-joint systems in the human body operate as which class of lever?
💡
Step-by-Step Explanation & Concept Rationale
Third-class levers (e.g., biceps brachii flexing the elbow, quadriceps extending the knee) maximize range of motion and speed of movement at the expense of force.
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