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PYQ 1200 Q/A Part - 1
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Kerala PSC General Science Book Study Materials Page 343
Book's First Page(d) Sodium silicate Ans: (b) 130. The chemical substance which is easily soluble in water is [UPPCS (Pre) 1993] (a) carbon (b) nitrogen (c) ammonia (d) iodine Ans: (c) 131. Before X-ray examination (coloured X-ray) of the stomach, pateints are given suitable salt of barium because- (a) Barium salts are white in colour and this helps stomach to appear clearly (b) Barium is a good absorber of X-rays and helps stomach to appear clearly (c) Barium salts are easily available (d) Barium allows X-rays to pass through the stomach Ans: (b) 132. Tear gas is : [Uttarakhand PCS 2003] (a) hydrogen sulphide (b) chlorine (c) hydrogen chloride (d) ammonia Ans: (b) 133. The most abundantly occurring element in the earth-crust is : [BPSC (Pre) 1998] (a) oxygen (b) nitrogen (c) manganese (d) silicon Ans: (a) 134. Which one among the following polymers is used for making bullet proof material? [CDS, 2012] (a) Polyvinyl Chloride (b) Polystyrene (c) Polyethylene (d) Polyamide Ans: (b) 135. Oxygen and Ozone are: [CDS, 2012] (a) allotropes (b) isotopes (c) isomers (d) isobars Ans: (a) 136. Which one of the following is not a mixture? [COS, 2010] (a) Toothpaste (b) Toilet soap (c) Baking soda (d) Vinegar Ans: (c) 137. Which one of the following is the correct sequence of the reactivity order of the elements? [NDA 2010] (a) Cu > Mg > Zn > Na (b) Na > Zn > Mg > Cu (c) Cu > Zn > Mg > Na (d) Na > Mg > Zn > Cu Ans: (b) 138. Which of the following is assumed to be the most fundamental chemical in the chemical industry? [BPSC (Pre) 1999] (a) H2CO3 (b) HNO3 (c) H2SO4 (d) HCI Ans: (c) 139. The electrolyte used in the car battery is: [BPSC (Pre) 1998] (a) hydrochloric acid (b) sulphuric acid (c) nitric acid 342