SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Tier II Level · Marathon

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SSC CGL Science – Human Body I: Digestion, Respiration, Circulation, Excretion – Tier II Level · Marathon – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The tidal volume of a healthy adult is about:

Correct Answer: A [500 mL]

Explanation:

TV ≈ 500 mL; RV 1,100–1,200 mL; IRV 2,500–3,000 mL.

2.  
Vital capacity is equal to:

Correct Answer: B [ERV + TV + IRV]

Explanation:

Maximum air breathed out after a maximum inspiration.

3.  
In an ECG, the P wave represents:

Correct Answer: D [depolarisation of the atria]

Explanation:

P – atria; QRS – ventricles; T – ventricular repolarisation.

4.  
According to NCERT, a person is said to have hypertension when blood pressure is repeatedly:

Correct Answer: C [140/90 mm Hg or higher]

Explanation:

120/80 is normal; 140/90 or higher is hypertension.

5.  
Which animals are uricotelic (excrete mainly uric acid)?

Correct Answer: B [Birds]

Explanation:

Reptiles, birds, land snails, insects – uricotelic; humans – ureotelic; bony fishes – ammonotelic.

6.  
Emphysema is a disorder in which:

Correct Answer: A [the walls of the alveoli are damaged]

Explanation:

Alveolar walls damaged → less surface for gas exchange; smoking is a major cause.

7.  
Erythroblastosis foetalis can occur when:

Correct Answer: C [an Rh-negative mother carries an Rh-positive foetus]

Explanation:

The mother's anti-Rh antibodies attack the foetal RBCs in a later pregnancy.

8.  
If 180 L of glomerular filtrate forms in a day and 1.44 L of urine is passed, what percentage of the filtrate is reabsorbed?

Correct Answer: D [99.2%]

Explanation:

1.44/180 = 0.8% leaves → 99.2% reabsorbed.

9.  
About what percentage of the oxygen in blood is carried by the red blood cells?

Correct Answer: B [About 97%]

Explanation:

About 97% by haemoglobin in RBCs; about 3% dissolved in plasma.

10.  
Rennin, a protein-digesting enzyme in the gastric juice of infants, mainly helps to digest:

Correct Answer: A [milk proteins]

Explanation:

Rennin acts on milk proteins in infants.

11.  
The hepatic portal vein carries blood from the:

Correct Answer: D [intestine to the liver]

Explanation:

Absorbed food goes first to the liver through the hepatic portal vein.

12.  
Silicosis is an occupational lung disease caused by long exposure to:

Correct Answer: C [stone (silica) dust]

Explanation:

Dust from stone grinding and mining causes fibrosis of the lungs.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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