Which unit is used to measure sound frequency?
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The major constituents of Portland cement include 1 Lime, silica and iron oxide 2 Lime, silica and magnesia 3 Silica, alumina and magnesia 4 Lime, silica and alumina
What is the Organic Evolution ?
Name the scientist who has been invited by the Srilankan Governement to have a Study on Employment development?
Optic fibers are mainly used for which of the following? 1 Communication 2 Weaving 3 Musical instruments 4 Eye surgery
Which are the important pulsating nebulae?
Label the following types of erosion in order by their ability to transport materials. Wind erosion, water erosion, glacial erosion, plant/animal erosion.
What are comets?
The vast resources of unutilized natural gas can be used in the production of 1 Graphite 2 Fertilizers 3 Synthetic petroleum 4 Carbide
The ratio of pure gold in 18 carat gold is 1 60% 2 75% 3 80% 4 100%
3 Answers DSSSB-Delhi Subordinate Service Selection Board,
Permanent hardness of water may be removed by the addition of 1 Alum 2 Sodium carbonate 3 Lime 4 Potassium permanganate
what are the advantages and disadvantages of empirical knowledge?
When was the first rocket launched from thumba?