Questions asked by Junaid Mirza

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• If storage of food is a function of root then why there is root modification called storage roots?
  
• What are #S_N1, S_N2, E1 and E2# reactions? How to identify which reaction is occurring in any given reaction.
  
• In a transistor if #I_c/I_e=alpha# and #I_c/I_b=beta#, if #alpha# varies between #(20)/(21)# and #(100)/(101)#, then the value of #beta# lied between?
  
• Force acting on a body varies with time as shown below. If the initial momentum of the body is #vecP# then the time taken by the body to retain its momentum #vecP# again is?
  
• What is difference between metamorphosis and retrogressive metamorphosis?
  
• What is the dimensional formula of inertia?
  
• Is this a typo in my textbook? [See the image attached]
  
• Why sodium has strongest tendency to form electrovalent bond? Why not Cesium?
  
• A particle located in one dimensional potential field has potential energy function U(x) = #a/x^2 - b/x^3# where a and b are positive constants. The position of equilibrium corresponds to x =?
  
• When a small mass m is suspended at lower end of an elastic wire having upper end fixed with ceiling. There is loss in gravitational potential energy, let it it be x, due to extension of wire, mark the correct option...(see details)?
  
• Why Socratic allows a single person to answer a question twice?
  
• A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and ball goes up to 2 m height further, find the magnitude of the force. Consider g = 10 m/s^2………[?]
  
• For ordinary terrestrial experiments, the observer is an inertial frame in which of the following cases?
  
• Which of the following quantities measured from different inertial reference frames are same?
  
• In a gravity free space, a liquid in a capillary tube will rise to full length of the tube. How?
  
• Can someone explain me how this 1.8F came? I know that change in temperature in Celsius scale is equal to change in temperature in Kelvin scale. But, what about Fahrenheit scale?
  
• Among the following which is not paramagnetic?
  
• Which one of the elements with following outer electronic configurations may exhibit the largest number of oxidation states?
  
• The electronic configuration of gadolinium (Atomic number 64) is?
  
• If each atomic orbital can accommodate maximum 5 electrons, then the maximum number of elements possible in #8^"th"# period would be?
  
• A wave function for hydrogen atom is given below, where #a_0# is the Bohr radius, #"52.9177 pm"#. If the Radial node in 2s be at #r_0#. Then the value of #r_0# in terms of #a_0# is?
  
• Potential energy of electron present in #Li^(2+)# is?
  
• Equal masses of #"S"_2#, #"S"_4# and #"S"_8# are taken. Highest number of sulphur atoms are present in?
  
• A mass of #"18 g"# of a compound #"M"_2"CO"_3 * x"H"_2"O"# #(M_ "M metal" = "24 g/mol")# is dissolved in #"500 mL"# of water and titrated against a #"0.5-M"# #"HCl"# solution. If the volume of #"HCl"# consumed is #"500 mL"#, the value of #x# is?
  
• In a sample of excited hydrogen atoms electrons make transition from n = 3 to n = 1 and emitted photons strike on a metal of work function 6.08 eV. The maximum kinetic energy of the ejected electron in the process will be?
  
• The position of a particle moving along x-axis varies with time t as #4x + t^2 = 4#. At what position, the particle is at rest?
  
• How many wavelengths of #Kr_86# are there in one metre?
  
• Which of the following elements has strongest tendency to form electrovalent bond?
  
• Element A has 3 electrons in the outermost orbit and element B has 6 electrons in the outermost orbit. The formula of the compound formed A and B would be?
  
• The formula of the compound is #A_2B_5#. The number of electrons in the outermost orbits of A and B respectively are?
  
• A car travelling at 60 kmph overtakes another car travelling at 42 kmph. Assuming each car to be 5.0 m long, find the time taken to overtake and the total distance used for overtake.?
  
• Which of the following has highest bond energy?
  
• The correct sequence of increasing covalent character is represented by?
  
• How are there #pi# bonds in #B_2# molecule without #sigma# bonds?
  
• A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when?
  
• Physics: Choose the correct option “?”
  
• Two blocks of masses 4kg and 2kg are attached to ends of a light spring having spring constant 1200 N/m. The whole system is placed on the smooth horizontal surface. When the spring is in relaxed state, the 4kg block is given velocity as shown below...”?”
  
• For the reaction, #["Ag(CN)"_2]^(-)-> "Ag"^+ + "2CN"^-# the equilibrium constant at 298 K is #4.0 × 10^-10#. The silver ion concentration in a solution which was originally 0.12 M in KCN and 0.04 M in #"AgNO"_3# is?
  
• If #DeltaH_c^@# of solid benzoic acid at 27°C is -x kcal/mol, then #DeltaE_c^@# (in kcal/mol) is?
  
• When the velocity of a relativistic charged particle increases, its specific charge?
  
• 5 cells each of EMF E and resistance r each are connected in series. If one cell is connected wrongly then potential difference across this cell will be?
  
• What is the major product formed in the following reaction?
  
• Genes are altered by manipulation and reinserted into an individual of same species then this individual can be called as___?
  
• A capacitor is formed by two square metal plates of edge a, separated by a distance d, Dielectrics of dielectric constants #K_1# and #K_2# are filled in the gap as shown in figure. Find the capacitance.?
  
• A parellel plate capacitor with plate speration d is charged with a battery so that energy stored is #"U"#. If a plate of dielectric #"K"# and thickness d is placed betweeen the plates of capacitor and battery remains connected. The work by battery is?
  
• If #"K"_"sp"# of #"Mg(OH)"_2# is more than that of #"MgCO"_3# which gets precipitated first?
  
• The equivalent weight of metal is triple to that of oxygen. What is the ratio of weight of its oxide to that of metal?
  
• The acid dissociation constant of #"H"_2"S"# and #"HS"^-# are #10^-7# and #10^-13# respectively. The pH of 0.1 M aqueous solution of #"H"_2"S"# will be?
  
• How much of water must be added to 300 mL of 0.2 M solution of #"CH"_3"COOH"# for the degree of dissociation of the acid to be doubled? [#"K"_"a"# for acetic acid is #1.8 × 10^-5#]
  
• The correct order of increasing acidic nature is?
  
• Which of the given salt will have maximum pH?