GENERAL INSTRUCTIONS (Please read the following instructions very carefully)
1. Question marks are mentioned with each Question.
2. Please write neat and clean hand-writing on Answer Sheet. Use Margin on right side and left side of Answer Sheet.
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5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
6. Take photo of all the Sheets and make single pdf file.
1
Which zone of candle flame in above figure is the largest zone ?
Innermost zone
Middle zone
Outermost zone
All flames are of equal length
2
__________ is being used to run vehicles in many towns, such as Delhi, Ahmadabad and Mumbai.
CNG gas
LPG gas.
Natural gas.
None of these.
3
CNG is the short form of ________________ .
Compressed natural gas
Converted natural gas
Conduced natural gas
4
The heat produced by burning 1 gm of fuel completely is known as_____________________.
Heat capacity
Calorific value
Vapour density
Boiling point
5
Combustion is an _________________
Exothermic reaction
Endothermic reaction
Displacement reaction
Reduction reaction
6
Which of the following is an ideal fuel ?
Coal
LPG
Petrol
None of these
7
Why is a flame always pointed upwards?
A Gases produced in flame are cold.
B Gases produced in flame are hot.
C Hot gases are lighter and rise up.
A and B only
B and C only
C and A only
A,B and C
8
________________ has helped in reducing the level of pollution.
Gasoline
CNG
9
Due to ________________ pollution caused by traditional fossil fuels petrol and diesel automobiles are being replaced by CNG..
Light
Heavy
Dark
10
Which of the following gases protects us from ultraviolet rays?
oxygen
ozone
carbon dioxide
nitrogen
11
Which among the following is the best fuel ?
Wood 4000 Cal/g
Coke 8000 Cal/g
Coal 7000 Cal/g
Kerosene 11,200 Cal/g
12
The process of burning a substance in the presence of air with the evolution of heat is called ______________ ,
Distillation
Carbonisation
Combustion
Refining
13
The conditions necessary for combustion are _________________.
Presence of combustible substance
Presence of supporter of combustion
Attainment of ignition temperature
All of these
14
The percentage of oxygen in the air does not change because _________________.
oxygen is not used in any natural process.
oxygen used up in natural processes is negligible.
oxygen used up in some natural processes is renewed by another natural process.
oxygen used up in natural processes is replenished by the ozone layer.
15
Sohail conducted an experiment by taking a candle and a steel spoon.He put the spoon in the middle of the yellow part of the candle flame for a few seconds.He observed black deposition on the spoon.What can be concluded from this experiment?
Wax is an inflammable substance hence,it burns with a smoky flame.
Unburnt carbon particles produce smoke (soot) which gets deposited on the spoon.
Yellow region of the flame is the hottest hence,it produces smoke.
Out of three colours(blue,black and yellow) of the flame,black being the darkest gets deposited on the spoon.