4146: Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons ?
(a) Methane, ethane, propane and butane
(b) Propane, butane, ethane and methane
(c) Butane, ethane, propane and methane
(d) Butane, propane, ethane and methane
4147: Which of the following has/have shrunk immensely/dried up in the recent past due to human activities ?
1. Aral Sea
2. Black Sea
3. Lake Baikal
Select the correct answer using the code given below :
(a) 1 only
(b) 2 and 3
(c) 2 only
(d) I and 3
4148: Which one of the following is the correct chronological order of the Afghan rules to the throne of Delhi?
(a) Sikandar Shah - Ibrahim Lodi - Bahlol Khan Lodi
(b) Sikandar Shah - Bahlol Khan Lod i- Ibrahim Lodi
(c) Bahlol Khan Lodi - Sikandar Shah - Ibrahim Lodi
(d) Bahlol Khan Lodi - Ibrahim Lodi - Sikandar Shah
4149: ".........They are people of yellow complexion, oblique eyes, high cheek bones, sparse hair and medium height." The reference here is to
(a) Nordic Aryans
(b) Austrics
(c) Negroids
(d) Mongoloids
4150: Who amongst the following was the first to state that the Earth was spherical?
(a) Aristotle
(b) Copernicus
(c) Ptolemy
(d) Strabo