3896: If the product of two numbers is 320 and their ratio is 1 : 5, what is the difference between the squares of these two numbers ?
(a) 1024
(b) 1365
(c) 1536
(d) 1635
3897: In the structure of planet Earth, below the mantle, the core is mainly made up of which one of the following?
(a) Aluminium
(b) Silicon
(c) Iron
(d) Chromium
3898: Which of the following has the highest calories per gram?
(a) Proteins
(b) Fats
(c) Sugar
(d) Glucose
3899: Since 1980, the share of the tertiary sector in the total GDP of India has
(a) shown an increasing trend
(b) shown a decreasing trend
(c) remained constant
(d) been fluctuating
3900: If the price of a television set is increased by 25%. then by what percentage should the new price be reduced to bring the price back to the original level ?
(a) 15%
(b) 25%
(c) 20%
(d) 30%