New Concepts/Shortcuts 20 Flashcards
what should be the first step for functions with graph or point of discontinuous such questions if there is the greatest integer function in it
break the functions with 1 integer gap so a
what to do if we have to find the number o f non differentiable points
find the shak vaale points and break the functions range wise
graph of {x}
1/2
why do we not need a continuous source of input in LC oscillators?
because we can send a little of output only again in the input oscillator
how are the two inductors s mutually coiled
they are coiled by wounding on the RHS long rod and hence are mutually coupled and have the same flux
why does the current don’t decay in LC oscillations
because the output is also sent in input which prevents it from decaying
what changes if two inductors are mutually coupled
there is a pi phase change between the two oscillators
why does the pi phase change isnt noticed n the final output of the LC oscillation circuit
because when the pi phase change happens due to the mutually coupled coiled
there is again a pi phase change due to the change in current from Ib to Ic and hence its gain back to 2pi or 0
whats a tuned/tank circuit in LC oscillation diagram
for a transistor to act as a switch it should operate in_____-
saturated and cut-off state
whats positive feedback and negative feedback
the return of part of an output signal to the input, which is in phase with it, so that the amplifier gain is increased and often the output is distorted is called positive feedback
the return of part of an output signal to the input, which is out of phase with it, so that amplifier gain is reduced and the output is improved called negative feedback
when does the transistor as a switch produce output and between what range is it decreasing and is constant
whats half deflection method for galvanometer with 2 galvanometers given
it’s simple that we get half the deflection as compared to the earlier one that is half the Ig and similar if we have 1/3 deflection or 1/n deflection
What’s the trick for these kinda questions?
whats a shortcut for finding the number of isomers for alkyl halides
see how many different kinds of H are present in the compound! that would be the number of isomers
whats a shortcut for finding the number of isomers for alkyl halides
see how many different kinds of H are present in the compound! that would be the number of isomers
what does work does silica gel and calcium chloride with water vapour
Water vapours are absorbed by anhydrous calcium chloride but adsorbed by silica gel.
how are gasses accumulated on the surface of a solid
If accumulation of gas on the surface of a solid occurs on account of weak van der Waals’ forces,
chemisorption required high/low energy of activation
Chemisorption involves high energy of activation
how is the amount of gas adsorbed depend on critical temperature?
easily liquefiable gases (i.e., with higher critical temperatures) are readily adsorbed as van der Waals’ forces are stronger near the critical temperatures. Thus, 1g of activated charcoal adsorbs more sulphur dioxide (critical temperature 630K), than methane (critical temperature 190K) which is still more than 4.5 mL of dihydrogen (critical temperature 33K)
dependence of physical adsorption with temperature
Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature
the Freundlich isotherm constant has values between
0 and 1
when is the adsorption independent of pressure?
when 1/n = 0
x/m= constant
and hence its constant
when does the adsorption varies directly with pressure
when 1/n=1
x/m=constant
hence it caries directly
what hapens whe litmus solution is shaken with charcoal
it bexomes colourless
color of precipitate of Mg(OH)2 when precipitated in presence of magneson reagent
The precipitate of Mg(OH)2 attains blue colour when precipitated in presence of magneson reagent.
what can be used to control humidity and remove moisture?
silica and aluminium gels
how are inert gases separated?
Due to the difference in the degree of adsorption of gases by charcoal, a mixture of noble gases can be separated by adsorption on coconut charcoal at different temperatures
what are adsorption indicators?
Surfaces of certain precipitates such as silver halides have the property of adsorbing some dyes like eosin, fluorescein, etc. and thereby producing a characteristic colour at the end point
when does the decomposition of KClO3 occur?
and how is it reduced?
in a range of 653-873 K
when a little manganese dioxide is added, the decomposition takes place at a considerably lower temperature range, i.e., 473-633K, and also at a much-accelerated rate.
What’s Ostwald’s process? and what’s the catalyst used in it?
catalyst= Pt
whats homogenous catalysis
When the reactants and the catalyst are in the same phase (i.e., liquid or gas), the process is said to be homogeneous catalysis
what will be the answer and why?
false
because the x(2R) is a significant value which will not result in an expression of force being directly proportional to the displacement! hence it is false
silicone is what type of polymer?
condensation polymer of dialkyl silanediol
which salts give green flame with blue center?
cupric salts
the relation between time taken by a ball to free fall! fall with a velocity upwards! fall with the same velocity downwards
formula for time taken for an object to free fall with 0 initial velocities in any acceleration
the trick for a free falling object distance after 1-1seconds
relation between Range and max heights reached by projectile projected with same velocity but different angle with the horizontal
