Question

FILL IN CORRECT OPTION FROM THE GIVEN OPTIONS

1) A ______ is a good reflector of sound. *
Curtain
Paper
Wall

2) Ordinary DEO contains a smaller proportion of _____. *
Silicon
Iron
Aluminium

3) ______ is the pure form of coal. *
Peat
Lignite
Anthracite

4) _______ is not a property of CO2 *
Combustibility
Heavier than air
Soluble in water

5) The audible sound range for the human is ______. *
0 - 20 Hz
20 Hz - 20 KHz
20 Hz - 2000 Hz

6) Compound in which Carbon is not found in combined state is *
Carbohydrates
Calamine
Rock salt

7) Coal does not contain______ *
Sulphur
Phosphorous
Iodine

8) The following hydrocarbon contain multiple bond between 2 carbon atoms. *
Methane
Ethene
Ethane

9) While making advanced ceramic the following oxide is not used.
Alumina
Zirconia
Cuprite
​

Answer 1

wall

aluminum

arthracite

combustibility

20hz-20000hz

calamine

iodine

etgene

cuprite