Q.1 What is the primary energy source for high-intensity, short-duration exercise?
A) Fat
B) Protein
C) Carbohydrates
D) Water
Explanation - During high-intensity, short-duration exercise, the body primarily uses carbohydrates as the energy source because they can be rapidly broken down into glucose.
Correct answer is: C) Carbohydrates
Q.2 Which system is primarily responsible for aerobic energy production?
A) Anaerobic system
B) Glycolytic system
C) Aerobic system
D) Creatine phosphate system
Explanation - The aerobic system is responsible for energy production during prolonged, moderate-intensity exercise, utilizing oxygen to metabolize carbohydrates and fats.
Correct answer is: C) Aerobic system
Q.3 What is VO2 max?
A) The volume of oxygen consumed during rest
B) The maximum amount of oxygen the body can use during exercise
C) The amount of lactic acid produced during exercise
D) The amount of carbon dioxide expelled during exercise
Explanation - VO2 max is a measure of the maximum rate at which an individual can consume oxygen during intense exercise, reflecting aerobic fitness.
Correct answer is: B) The maximum amount of oxygen the body can use during exercise
Q.4 What happens to the heart rate during prolonged exercise?
A) Heart rate decreases
B) Heart rate stays the same
C) Heart rate increases
D) Heart rate fluctuates drastically
Explanation - With prolonged exercise and training, the heart becomes more efficient, leading to a decrease in resting heart rate and a lower heart rate during exercise.
Correct answer is: A) Heart rate decreases
Q.5 Which muscle fibers are recruited during high-intensity, short-duration exercises?
A) Type I fibers
B) Type IIa fibers
C) Type IIb fibers
D) None of the above
Explanation - Type IIb muscle fibers are fast-twitch fibers that are recruited during high-intensity, short-duration exercises that require rapid force generation.
Correct answer is: C) Type IIb fibers
Q.6 Which of the following hormones is most responsible for increasing glucose availability during exercise?
A) Insulin
B) Glucagon
C) Testosterone
D) Estrogen
Explanation - Glucagon helps to increase glucose availability by stimulating the release of glucose from the liver during exercise.
Correct answer is: B) Glucagon
Q.7 Which of the following is a physiological adaptation to endurance training?
A) Decreased capillary density
B) Increased mitochondrial density
C) Decreased stroke volume
D) Increased body fat percentage
Explanation - Endurance training leads to adaptations such as increased mitochondrial density, which helps improve the muscles' ability to produce energy aerobically.
Correct answer is: B) Increased mitochondrial density
Q.8 How does exercise affect the autonomic nervous system?
A) Exercise only stimulates the parasympathetic nervous system
B) Exercise only stimulates the sympathetic nervous system
C) Exercise stimulates both the sympathetic and parasympathetic nervous systems
D) Exercise has no effect on the autonomic nervous system
Explanation - Exercise stimulates both the sympathetic nervous system (fight-or-flight response) and parasympathetic nervous system (rest-and-digest) at different stages, depending on intensity and recovery.
Correct answer is: C) Exercise stimulates both the sympathetic and parasympathetic nervous systems
Q.9 Which of the following is true about lactic acid during exercise?
A) It is produced only during anaerobic exercise
B) It is produced during both aerobic and anaerobic exercise
C) It is produced only during aerobic exercise
D) Lactic acid does not get produced during exercise
Explanation - Lactic acid is primarily produced during anaerobic exercises, where the demand for energy exceeds the oxygen supply, leading to incomplete glucose breakdown.
Correct answer is: A) It is produced only during anaerobic exercise
Q.10 What is the main role of the cardiovascular system during exercise?
A) To remove lactic acid from muscles
B) To deliver oxygen and nutrients to muscles
C) To increase muscle temperature
D) To regulate blood pressure only
Explanation - During exercise, the cardiovascular system plays a crucial role in delivering oxygen and nutrients to muscles, as well as removing metabolic waste products.
Correct answer is: B) To deliver oxygen and nutrients to muscles
Q.11 What is the effect of training on stroke volume?
A) Stroke volume decreases
B) Stroke volume remains unchanged
C) Stroke volume increases
D) Stroke volume becomes irregular
Explanation - Regular aerobic training increases stroke volume (the amount of blood pumped per heartbeat), improving the efficiency of the heart.
Correct answer is: C) Stroke volume increases
Q.12 What is the primary energy source for high-intensity, short-duration exercise?
A) Fat
B) Protein
C) Carbohydrates
D) Water
Explanation - During high-intensity, short-duration exercise, the body primarily uses carbohydrates as the energy source because they can be rapidly broken down into glucose.
Correct answer is: C) Carbohydrates
Q.13 Which system is primarily responsible for aerobic energy production?
A) Anaerobic system
B) Glycolytic system
C) Aerobic system
D) Creatine phosphate system
Explanation - The aerobic system is responsible for energy production during prolonged, moderate-intensity exercise, utilizing oxygen to metabolize carbohydrates and fats.
Correct answer is: C) Aerobic system
Q.14 What is VO2 max?
A) The volume of oxygen consumed during rest
B) The maximum amount of oxygen the body can use during exercise
C) The amount of lactic acid produced during exercise
D) The amount of carbon dioxide expelled during exercise
Explanation - VO2 max is a measure of the maximum rate at which an individual can consume oxygen during intense exercise, reflecting aerobic fitness.
Correct answer is: B) The maximum amount of oxygen the body can use during exercise
Q.15 What happens to the heart rate during prolonged exercise?
A) Heart rate decreases
B) Heart rate stays the same
C) Heart rate increases
D) Heart rate fluctuates drastically
Explanation - With prolonged exercise and training, the heart becomes more efficient, leading to a decrease in resting heart rate and a lower heart rate during exercise.
Correct answer is: A) Heart rate decreases
Q.16 Which muscle fibers are recruited during high-intensity, short-duration exercises?
A) Type I fibers
B) Type IIa fibers
C) Type IIb fibers
D) None of the above
Explanation - Type IIb muscle fibers are fast-twitch fibers that are recruited during high-intensity, short-duration exercises that require rapid force generation.
Correct answer is: C) Type IIb fibers