1) Tooth decay start when pH of the mouth is lower than______ a) 5.5 b) 5.05 2) sodium carbonate is a salt at its aqua solution for this is ______nature a) Acidic b) basic 3) addition, reaction can be performed with _______hydrocarbon a) saturated b) unsaturated 4) the molecular formula of ethyne is a) C2H7 b) C2H2 5) Eqabal, kku vilik acid and alcohol react in presence of metal acid catalyst and from _____ a) acetic acid b) ester 6) centre for visual and auditory reflexes are located in_____ a) mid brain b) hind brain 7) abscisic acid is a_____ type hormone of plant a) growth promoter b) growth inhibitors 8) Inna, human body carbohydrate is stored as______ a) sucrose b) glycogen 9) _______ metal is used to make the filament of the electric bulb a) copper b) tungsten 10) the diameter of human eye Ball is _____ a) 0.025 m b) 0.25m 11) the unit of electric potential difference is_______ a) volt b) watt 12) _______ colour of light Devi at maximum and dispersion of white light by glass prism a) violet b) red 13) east, and a hydra reproduce a sexually by_____ a) budding b) fission 14) the factor suggested by mental or known as____ in modern genetics a) gamate b) gene 15) the magnetic field lines are never a) parallel b) intersects

science test (blanks). std 10th

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