10th Class Chapter No.1
Biology MCQs Online Quiz
All MCQs Selected from Old Board Papers
Best MCQs for Board Examination
Total MCQs ( in this Quiz ) = 50
6. What is the percentage of heart disease in non-smokers? (who are exposed to passive smoke)
A. 25 – 30%
B. 30 – 35%
C. 40 – 45%
D. 50 – 55%
Answer:
A. 25 – 30%
7. The primary chemical stimulus for breathing is the concentration of;
A. Carbon dioxide in blood
B. Oxygen in blood
C. Carbon dioxide in muscles
D. Oxygen in muscles
Answer:
A. Carbon dioxide in blood
8. Point out the FALSE statement about respiration
A. Gases can easily pass through the walls of the alveoli
B. Gas exchange in lungs is very efficient because lungs provide large surface area
C. In emphysema the walls of alveoli break and there is more surface area
D. Dust particles can damage the lung by irritating the inner alveoli surface
Answer:
C. In emphysema the walls of alveoli break and there is more surface area
9. A disease involving the breakdown of air sacs of the lungs is
A. Pneumonia
B. Bronchitis
C. Asthma
D. Emphysema
Answer:
D. Emphysema
10. Which process does NOT occur in the nasal cavity?
A. Trapping of large dust particles
B. Humidification of the inhaled air
C. Warming of the inhaled air
D. Exchange of gases
Answer:
C. Warming of the inhaled air
