| Sr No |
Question |
Answer |
Remarks |
| 1 |
Decomposition reaction is such in which |
single reactant breaks down to two or more simple products |
|
| 2 |
Common name of CaOCl₂ is |
bleaching powder |
Bleaching powder is made using Calcium Hydroxide and chlorine resulting bleaching powder and water. |
| 3 |
What is required by human body to get rid of pain due to high acidity? |
Magnesium Hydroxide |
Milk of magnesia is generally used to treat high acidity in the stomach. |
| 4 |
The reagent used to dissolve gold and platinum is |
Aqua regia |
Aqua regia is a freshly prepared mixture of concentrated HCl and H₂NO₃. It can dissolve Gold and Platinum but none alone |
| 5 |
Condition for rusting of ferrous material is the existing of |
moist air |
Rusting takes place when air and water both attacks together the ferrous surface. |
| 6 |
The property of carbon to form bonds with other atom of carbon is called |
catenation |
Petanation and tetanation are not any property and options are only distractors. Tetravelency is a property |
| 7 |
Which elements were selected by Mendeleev for studying the chemical property for finding the position in the periodical table? |
Oxygen and Hydrogen |
Oxygen and Hydrogen are very reactive and forms oxide and hydride with each elements easily. |
| 8 |
Which of the statement is not correct when going from left to right across the periods of periodic table? |
the atoms lose their electrons more easily |
The number of electron keep on increasing as we go from left to right on a period. |
| 9 |
Name the constituent which is not a part of the photosynthesis process |
oxygen |
The constituents are CO₂. Water, Chlorophyll and sunlight which makes carbohydrates providing energy to the plant. |
| 10 |
Terrestrial animals are those which lives on |
land |
|
| 11 |
The role of kidney in a human body is to |
remove nitrogenous products from blood |
Function of kidney is remove waste products from blood on lines similar to as CO₂ removed by lungs. |
| 12 |
Image formed by a plane mirror is always |
virtual and erect |
|
| 13 |
Power of a lens is given as |
1/f |
Power of a lens is given in dioptre and given as f because when combining two lenses it can be added as a normal sum. |
| 14 |
During dispersion of light through a prism, which light bends the least |
red |
Red light bends the least and violet the maximum |
| 15 |
Depletion of ozone layer at higher layer of atmosphere is a consequential effect of |
release of chlorofluoro carbons into the environment |
Ozone is a molecule of three atoms of oxygen with chemical formula of O₃ and formed in the higher level atmosphere by breaking oxygen molecule into oxygen atoms which combine with oxygen molecule to form ozone. This ozone protects UV radiation passing to earth which causes skin cancer. |
| 16 |
Resistance of any wire depends directly on the |
length and inversely on the area of corssection |
Always remember the formula R=ρ*l/A and be careful about the distractors. The purpose of distractor is distract you from the correct answer and make you commit mistakes |
| 17 |
Four resistances of value 1.5 ohms, 1.5×10² ohms, 2.6×10⁶ ohms and 1.7×10⁸ are connected in parallel, the net resistance will be |
1.49 ohms |
Never attempt to such a long calculation in multiple choice questions and use logic. The resistance will always be slightly lower than 1.5 ohms and cannot be greater than 1.5 ohms. |
| 18 |
Fleming’s left hand rule is used to find out the direction of |
direction of force produce on a current carrying conductor |
Fleming’s left hand rule is find out the force where as right hand rule is for generated current. In LHR, thumb points towards motion when first and middle finger points towards field and current which are 90 degree to each other. |
| 19 |
This is not a renewable source of energy? |
Nuclear |
Renewable source of energy is one which keeps on renewing at a short cycle whereas non-renewable source of energy is renewable with a time period of 1000 to million years. |
| 20 |
This is not a limitation while planning a wind power house to augment the power need of an establishment |
back up facility |
Wind farm is not a stand-alone system and requires a back up when generation is not enough. But in case of need of augmentation of power generation, some source is already available. |
| 21 |
Purity of Gold is defined in carat and 24 carat is the purest form. 22 Carrot gold will be |
Purity of Gold is defined in carat and 24 carat is the purest form. 22 Carrot gold will be |
Along with what is mentioned, chrome plating, galvanising, tinning are also used for this purpose. |