4271: The resinous substance, shellac is obtained from
(a) Crude oil
(b) The bark of a tree
(c) An insect
(d) Distillation of wood
4272: 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 ?
(a) When inhaled into the human body, CO is converted into CO2
(b) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen
(c) The inhaled CO destroys the chemical structure of haemoglobin
(d) The inhaled CO adversely affects the respiratory centre in the brain
4273:
What is the maximum number of different paths that exist between the station A and the station B?
(a) 28
(b) 31
(c) 33
(d) 35
4274: Deserts such as the Sahara are generally found between 20° and 30° latitudes in the western parts of the continents. This is because these regions
(a) Have off-shore winds throughout the year
(b) Have warm off-shore currents
(c) Lie in the belt of the doldrums
(d) Are very hot throughout the year
4275: In which country is the committee which selects winners for Nobel peace prize located?
(a) Norway
(b) Sweden
(c) Finland
(d) Denmark