| Sr No |
Question |
Answer |
Remarks |
| 1 |
Exothermic chemical reactions are those in which |
heat is released |
Always remember exothermic means exhale or out and endothermic means inhale or intake |
|
| 2 |
Pb(NO₃)₂ when heated forms the following products |
PbO, NO₂, O₂ |
Pb(NO₃)₂ is called lead nitrate and when on heating releases the products given at option 2. The best way to find the answer is by balancing the equation. |
|
| 3 |
pH range of human body is |
6.5-7.0 |
pH scale is 0 to 14 with neutral at 7. Zero is highly acidic and 14 highly basic. pH of human body is slightly acidic becuase of the need of acids to consume food. |
|
| 4 |
Bag of chips is flushed with nitrogen gas to |
prevent oxidation of anti-oxidants used in the oil |
Usually substances which prevent oxidization are added to foods containing fats and oil. Keeping food in air tight containers helps to slow down oxidation. This is the reason of flushing out oxygen and filling nitrogen to prevent oxidation. |
|
| 5 |
Electrolytic process is used for extracting of metals lying |
low in the activity series |
Metals with very high reactivity are extracted by electrolysis of the molten ore. They cannot be extracted by heating, oxidation or reduction. |
|
| 6 |
Unsaturated hydrocarbons with one or more double bonds is called |
alkenes |
Remember all single bonds – alkanes, one or two double bonds – alkenes and one triple bond – alkynes. Alkines does not exists and a distractor. |
|
| 7 |
The formula is of functional group |
ketone |
|
|
| 8 |
The elements have the outermost orbit complete filled up are called |
inert gases |
With no vacancy to fill up the outermost orbit, the gases are unable to exchange any electrons and thus non-reactive. |
|
| 9 |
The anther contains |
pollen grains |
|
|
| 10 |
The function of oesophagus is to |
transport food from mount the stomach |
|
|
| 11 |
The blood from the lungs is dealt in the heart in |
right artrium |
The blood flows from right artrium to right ventricle and to lungs. Oxygen rich blood than comes to left artrium and move to the body through left ventricle. |
|
| 12 |
The autotrophic mode of nutrition requires |
sunlight |
|
|
| 13 |
In a concave mirror, the size of the real and inverted image is same, than the object if lying |
at the center of curvature point |
|
|
| 14 |
What type of vision correcting lens is generally required by every one in old age |
convex |
During old age, the near point gradually recedes away and find it difficult to see nearby objects and this defect is called presbyopia and corrected using convex lens to bring back the image on the retina which earlier was forming far away from retina. |
|
| 15 |
The human eye forms the image of an object at its |
retina |
Check different parts of the eye. |
|
| 16 |
A current of 0.5 A has passed through an incandescent lamp for a period of 10 minutes. What is the total charge passed through the lamp |
300 C |
Q=i*t; 0.5*600=300 C |
|
| 17 |
The SI unit of electrical resistivity is |
Ohm-m |
In case of doubt use the ρ=R*A/l to work out the unit as Ohm-m. It can be written as Ohm-cm but than it cannot be SI unit. |
|
| 18 |
The magnetic field around a current carrying conductor will always be |
in a circle around the conductor |
|
|
| 19 |
The working principle of a fuse is |
Joule’s Heating effect |
|
|
| 20 |
Bio-mass fuels are |
All |
Renewable source of energy is one which can be renewed within a short period and therefore, plant (all plants incl. vegetable), animal and sewage is produced continuously in the system and a good source of energy except the reason that the quantity is less and only small power plants can be built on such system. |
|
| 21 |
The major hazards of nuclear power generation is |
All |
The limitations are not only these three but includes not availability of Uranium raw material also. |
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