# Q&A - Ask Doubts and Get Answers

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As learnt in concept Domain of function - All posible values of x for f(x) to be defined is known as domain. -     Here b-5>0 So, b>5. and b+7>0 So,b>-7 Thus,    Option 1) Incorrect option Option 2) Correct option Option 3) Incorrect option Option 4) None of these. Incorrect option
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As learnt in concept UNION OF SETS - Let A and B be any two sets. The union of A and B is the set which consists of all the elements of A and all the elements of B, the common elements being taken only once. The symbol ‘∪’ is used to denote the union. - wherein Symbolically, we write A U B = {x: x ∈ A or x ∈ B}.     So               Option 1) This is incorrect option Option 2) This is...
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As we learnt in  Singular matrix -   - wherein  denotes determinants of     A matrix is not invertible if determinant=0 Option 1) Incorrect Option 2) Correct Option 3) Incorrect Option 4) Incorrect
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As we learnt in  Singular matrix -   - wherein  denotes determinants of     Determinant of Thus it is singular matrix. Option 1) Incorrect Option 2) Incorrect Option 3) Incorrect Option 4) Correct
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Solution of Differential Equation - put       - wherein Equation with convert to           Option 1) This option is incorrect  Option 2) This option is correct  Option 3) This option is incorrect  Option 4) None of these This option is incorrect
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Solution of Differential Equation - put       - wherein Equation with convert to         Integrating both sides   Option 1) This option is incorrect  Option 2) This option is correct  Option 3) This option is incorrect  Option 4) This option is incorrect
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Resultant amplitude of two wave -     - wherein amplitude of wave 1   amplitude of wave 2 phase difference         Option 1) 7 Incorrect Option 2) 6 Correct Option 3) 5 Incorrect Option 4) 3.5 Incorrect
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Deviation from thin prism - - wherein Applicable when A is very small  ( i.e. thin prism )                        (for thin prism)   in air ,  ----------------------(1) in water    Option 1) 9:8 Incorrect Option 2) 4:3 Incorrect Option 3) 3:4 Incorrect Option 4) 4:1 Correct
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Use the concept of Position vector - Let O be a fixed origin, then position vector of P is  - wherein     Centroid is intersection is  orthocentre: intersection of altitudes. so that in a triangle ABC the orthocentre H, centroid G and circumcentre M are collinear ang G divides HM internally in the ration 2:1                   Option 1) 3 Correct option Option 2) 2 Incorrect option Option...
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As we learnt Scalar Product of two vectors - - wherein   is the angle between the vectors                 =  0   Option 1) Positive Incorrect Option Option 2) Negative Incorrect Option Option 3) Zero Correct Option Option 4) None Incorrect Option
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As we learnt Angle between vector a and vector b - - wherein Here ??????     =  Option 1) Incorrect Option Option 2) Incorrect Option Option 3) Correct Option Option 4) Incorrect Option
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As we learnt in  Coefficient of performance (?) -   - wherein For a perfect refrigerator      Coefficient of performance Option 1) 10 Incorrect Option 2) 1 Incorrect Option 3) 0 Incorrect Option 4) 9 Correct
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As we learnt in  Electrode Potential(Nerst Equation) - - wherein is concentration of species F= 96487 C  R= 8.314  T= Temperature in kelvin   Lets write down the reactions of anode and cathode . At anode   At cathode,   Soution is 1 Option 1) Correct Option 2) Incorrect Option 3) Incorrect Option 4) Incorrect
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As we learnt in Chemical Cells - The cells in which electrical energy is produced from the energy change accompanying a chemical reactions or a physical process are known as chemical cells. -     One cell cannot be used in this case because two electrodes of the same substance in a single electrolyte will have no potential difference. Option 1) One cell can be constructed  Correct Option...
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Sexagesimal System -

In this system, an angle is measured in degrees, minutes and seconds.

- wherein

$1\ right angle = 90^{\circ}$

$1^{\circ} = 60{}'$

$1{}' = 60{}''$

Angle made by hour hand and minute hand is approx $100^{^{\circ}}$ degrees for past seven and two minute total length will be approx 16.6{ because there are 60 gaps and each gap having  $\frac{360}{60}=6$ measurement

$\therefore$ total angle 16.6 X 6 = 99.6 $\simeq 100{}'$

$\frac{5\pi ^{c} }{g}$

[$\because$ the hour hand rotates through an angle of $30^{\circ}$ in one hour or $\left ( \frac{1}{2} \right )^{\circ}$ in one minute.]

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As learnt in Integration By PARTS - Let  and  are two functions then  - wherein Where  is the Ist function  is he IInd function                                                                                  Option 1) This option is incorrect. Option 2) This option is incorrect. Option 3) This option is correct. Option 4) This option is incorrect.
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