2556: With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statements is/are correct?
1. Fly ash can be used in the production of bricks for building construction.
2. Fly ash can be used as a replacement for some of the Portland cement concrete.
3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.
Select the correct answer using the code given below.
(a) 1 and 2
(b) 2 only
(c) 1 and 3
(d) 3 only
2557: Bhakra Nangal, Hirakud and Kosi projects are situated on the rivers:
(a) Sutlej, Mahanadi and Kosi
(b) Sutlej, Mahanadi and Purna
(c) Mahanadi, Beas, Godavari
(d) Beas, Mahanadi, Sutlej
2558: Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning?
1. Smelting units
2. Pens and pencils
3. Paints
4. Hair oils and cosmetics
Select the correct answer using the codes given below :
(a) 1, 2 and 3 only
(b) 1 and 3 only
(c) 2 and 4 only
(d) 1, 2, 3 and 4
2559: Which of the following is not correct ?
(a) Doldrums : Equatorial low pressure zone
(b) Hurricane : A wind having a mean velocity of less than 100 km per hour
(c) New Moore Island : India
(d) Alluvium : Rann of Kutch
2560: Which of the following award winning films has no dialogues?
(a) Pushpak
(b) Daasi
(c) Salaam Bombay
(d) Chetak