1471: The number of times in a day the Hour-hand and the Minute-hand of a clock at right angles is
(a) 44
(b) 48
(c) 24
(d) 12
1472: 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
1473: Which one of the following is the correct sequence of the given substances in the decreasing order of their densities ?
(a) Steel > Mercury > Gold
(b) Gold > Mercury > Steel
(c) Steel > Gold > Mercury
(d) Gold > Steel > Mercury
1474: The conclusion that Asia and Africa had a single landmass is provided by:
(a) The deserts in Asia and Africa
(b) The similarity in climate of certain regions of Asia and Africa
(c) The finding of same type of fossil in both the regions
(d) All of these
1475: Which of the following pairs of states and their important crops are correctly matched ?
I. Kerala : Tapioca
II. Maharashtra : Cotton
III. W. Bengal : Jute
IV. Gujarat : Groundnut
Select the correct answer using the codes given below :
Codes :
(a) I, II and III
(b) I, II and IV
(c) I, III and IV
(d) II, III and IV