CBSE
Multiple Choice QuestionsDoctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when
AB valves open up
Ventricular walls vibrate due to gushing in of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles
Semilunar valves close down after the blood flows into vessels from ventricles
Which one of the following human organs is often called the “graveyard” of RBCs?
Gall bladder
kidney
Spleen
Spleen
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor
Blood group B
Blood group AB
Blood group O
Blood group O
Reduction in pH of blood will
reduce the blood supply to the brain
decrease the affinity of haemoglobin with oxygen
release bicarbonate ions by the liver
release bicarbonate ions by the liver
In which one of the following options the two examples are correctly matched with their particular type of immunity?
| Examples | Type of immunity |
| Polymorpho-nuclear leukocytes and monocyte | Cellular barriers |
| Examples | Type of immunity |
| Anti-tetanus and anti-snake bite injections | Active immunity |
| Examples | Type of immunity |
| Saliva in mouth and Tears in eyes | Physical barriers |
| Examples | Type of immunity |
| Saliva in mouth and Tears in eyes | Physical barriers |
The diagram given here is the standard ECG of a normal person. The P- wave represents the
Contraction of both the atria
initiation of the ventricular contraction
the beginning of the systole
the beginning of the systole
Which one of the following animals has two separate circulatory pathways?
Frog
Lizard
Whale
Whale
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
Have more RBCs and their haemoglobin has a lower binding affinity of O2
are not physically fit to play games like football
Suffer from altitude sickness with symptoms like nausea, fatigue, etc
Suffer from altitude sickness with symptoms like nausea, fatigue, etc
Which one of the following is wrong statement?
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
Root nodule forming nitrogen fixers live as aerobes under free-living conditions
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
Blood pressure in the pulmonary artery is
more than that in the carotid
more than that in the pulmonary vein
less than that in the Vena cava
less than that in the Vena cava
