Q. The incomplete burning of petrol and diesel produces -
1) nitric oxide
2) nitrogen dioxide
3) carbon dioxide
4) carbon monoxide
Q. Lime water is turned milky by -
1) CO
2) CO2
3) O2
4) O3
Q. Glucose is converted to ethyl alcohol by the enzyme -
1) maltase
2) invertase
3) zymase
4) diastase
Q. The breath test conducted by police to check drunken driver has which one of the following on the filter paper?
1) Potassium dichromate-sulfuric acid
2) Potassium permanganate-sulfuric add
3) Silica gel coated with silver nitrate
4) Turmeric
Q. Milk is a poor source of -
1) calcium
2) protein
3) vitamin C
4) carbohydrate
Q. The first man who placed his foot on the moon is -
1) Leonov
2) Neil Armstrong
3) Michael Collins
4) James Van Allen
Q. Which of the following does not change when light travels from one medium to another?
1) Velocity
2) Wavelength
3) Frequency
4) Refractive index
Q. 'Light-year' is a unit of -
1) time
2) speed
3) distance
4) intensity of light
Q. Faraday constant -
1) depends on the amount of the electrolyte
2) depends on the current passed in the electrolyte
3) depends on the volume of the solvent in which the electrolyte is dissolved
4) is a universal constant
Q. On heating, the resistance of a semiconductor -
1) increases
2) decreases
3) remains same
4) first increases and then decreases
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