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. 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 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 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. The number of molecules of water of crystallization in copper Sulphate, Sodium carbonate, and gypsum is -
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. At nearly 70°C, sodium bicarbonate shows the property of r&dually decomposing, which makes it sable in bakery products. The product T decomposition responsible for this use of sodium bicarbonate is -
1) Carbon dioxide
2) Hydrogen
3) Water vapour
4) Oxygen
Q. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 2.0 metre
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meters
Q. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -
1) Reflection
2) Total internal reflection
3) Scattering
4) Interference
Q. Which one of the following is the largest composition in biogas?
1) Carbon dioxide
2) Methane
3) Hydrogen
4) Hydrogen sulphide
Q. The instrument used for detecting the presence of electric current in a circuit is -
1) Refractometer
2) Galvanometer
3) Viscometer
4) Diffractometer
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