Q. Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are -
1) 5, 10 and 2 respectively
2) 10, 2 and 5 respectively
3) 5, 2 and 10 respectively
4) 2, 5 and 10 respectively
Q. Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?
1) Yellow - pink - blue
2) Yellow - reddish brown - yellow
3) Yellow - reddish brown - blue
4) Yellow - blue - pink
Q. Which one of the following statements regarding Bleaching powder and D.D.T. is correct?
1) Both are inorganic compounds
2) Both are organic compounds
3) Both contain chlorine
4) Both contain calcium
Q. Which one of the following is the best example of desiccant?
1) Silica gel
2) Polystyrene
3) Sodium chloride
4) Sodium carbonate
Q. Which one of the following was the first mineral acid discovered?
1) Sulphuric acid
2) Hydrochloric acid
3) Nitric acid
4) Phosphoric acid
Q. In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is not correct?
1) The image will be virtual
2) The image will be enlarged or magnified
3) The image will be formed at infinity
4) The image will be erect
Q. In an incandescent electric bulb, the filament of the bulb is made up of which metal?
1) Aluminium
2) Copper
3) Tungsten
4) Silver
Q. Which one of the following is not the unit of energy?
1) Joule
2) Watt-hr
3) Newton-metre
4) kg-metre/sec2
Q. Which one of the following statements is not correct?
1) Biomass is a renewable source of energy
2) Gobar gas is produced when cowdung, crop residues, vegetable waste and sewage are allowed to decompose in the absence of oxygen
3) Biogas generation reduces soil and water pollution
4) Heating capacity of biogas is very low
Q. In prokaryotic organisms, nuclear region is not surrounded by a membrane. This undefined nuclear region is known as -
1) Nucleic acid
2) Nucleoid
3) Nucleolus
4) Nucleosome
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