21: With reference to Indias Five-Year Plans, which of the following statements is/are correct?
1. From the Second Five-Year Plan, there was a determined thrust towards substitution of basic and capital good industries.
2. The Fourth Five-Year Plan adopted the objective of correcting the earlier trend of increased concentration of wealth and economic power.
3. In the Fifth Five-Year Plan, for the first time, the financial sector was included as an integral part of the Plan.
Select the correct answer using the code given below:
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
22: Which one of the following foreign travellers elaborately discussed about diamonds and diamond mines of India?
(a) Francois Bernier
(b) Jean-Baptiste Tavernier
(c) Jean de Thevenot
(d) Abbe Barthelemy Carre
23: The ratio of boys and girls in sections A, B, C and D of class VI is respectively 7 : 5, 5 : 3, 3 : 2 and 2 : 1. If the number of students in each of the sections is equal, then maximum number of boys are en rolled in section:
(a) A
(b) B
(c) C
(d) D
24: A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in
(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
25: Consider the following statements:
1. Agricultural soils release nitrogen oxides into environment.
2. Cattle release ammonia into environment.
3. Poultry industry releases reactive nitrogen compounds environment.
Which of the statements given above is/arc correct?
(a) 1 and 3 only
(b) 2 and 3 only
(c) 2 only
(d) 1, 2 and 3