NEET (UG)

Practice Test 1 — Body Fluids and Circulation

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

Plasma proteins responsible for clotting include:

Solution: Fibrinogen is the clotting plasma protein.

Question 2

The graveyard of red blood cells is the:

Solution: Old RBCs are destroyed in the spleen.

Question 3

The universal blood donor group is:

Solution: Group O (no A/B antigens) is the universal donor.

Question 4

Blood passes through the heart only once per circuit in:

Solution: Fishes have single circulation.

Question 5

The valve between the right atrium and right ventricle is the:

Solution: The right AV valve is the tricuspid valve.

Question 6

The first heart sound 'lubb' is produced by closure of the:

Solution: 'lubb' = AV valves close at the start of ventricular systole.

Question 7

The pacemaker of the heart is the:

Solution: The SA node is the pacemaker.

Question 8

Repolarisation of the ventricles is shown by the ___ of an ECG:

Solution: The T wave = ventricular repolarisation.

Section B — Assertion & Reason

Question 9

A: A person with group O blood is called a universal donor.
R: Group O red blood cells carry neither A nor B antigens.

Solution: Absence of A/B antigens means no recipient antibodies attack O cells — R explains A.

Question 10

A: The left ventricle has the thickest muscular wall of the four chambers.
R: It must pump blood against high pressure to the whole body via the aorta.

Solution: Pumping to the whole body requires the most muscular wall — R explains A.

Question 11

A: The human heartbeat is initiated by a nerve impulse from the brain.
R: The heart is myogenic, with the beat originating in the SA node.

Solution: A is false — the beat originates in the SA node (myogenic), not from a brain nerve; R is true.

Question 12

A: Double circulation allows efficient oxygen delivery in mammals.
R: It keeps oxygenated and deoxygenated blood completely separate.

Solution: Keeping the two bloods separate is what makes delivery efficient — R explains A.