Science Quiz - Question & Answers Set

Science Quiz - Question & Answers Set - 9

Question 2 :
Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition ?
When inhaled into the human body, CO is converted into CO2
The inhaled CO has much higher affinity for haemoglobin as compared to oxygen
The inhaled CO destroys- the chemical structure of haemoglobin
The inhaled CO adversely affects the respiratory centre in the brain

Question 4 :
With regard to the transmission of the Human Immuno deficiency Virus, which one of the following statements is not correct ?
The chances of transmission from female to male are twice as likely as from male to female
The chances of transmission are more if a person suffers from other sexually transmitted infections
An infected mother can transmit the infection to her baby during pregnancy, at childbirth and by breast feeding
The risk of contracting infection from transfusion of infected blood is much higher than an exposure to contaminated needle

Question 11 :
The incorrect statement about displacement is:
displacement is the difference between the final and initial positions of the particle
displacement is a vector quantity
displacement can be negative,zero or positive
the magnitude of displacement is always equal equal to distance

Question 12 :
Identify the correct statement about the centre of mass:
At the centre of mass, the entire mass of the body is concentrated
The centre of mass of a body may lie inside or outside the body
The centre of mass always lies on the axis of symmetry if it exists
The centre of mass of a system may coincide with one of the particles of the system