396: Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance ?
(a) Aluminium
(b) Chromium
(c) Nickel
(d) Tungsten
397: Arrange the following Buddhist councils in a chronological order:
(1) Vaishali
(2) Rajagraha
(3) Patliputra
(4) Sreenagar
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(a) 1, 4, 3, 2
(b) 3, 2, 1, 4
(c) 4, 1, 2, 3
(d) 2, 1, 3, 4
398: Which one of the following plants can fix nitrogen from air?
(a) Rice
(b) Wheat
(c) Pea
(d) Maize
399: According to ancient Indian cosmogonic ideas the sequential order of the cycle of four aeons (Yugas) is
(a) Dvapara, Krita, Treta and Kali
(b) Krita, Dvapara, Treta and Kali
(c) Krita, Treta, Dvapara and Kali
(d) Treta, Dvapara, Kali and Krita
400: 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