Physics-
General
Easy
Question
Consider radioactive decay of A to B which , further decays either to X or Y, and
are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are 
, zero and zero respectively 
are the number of nuclei of A,B,X and Y are at any instant t.
At 
, which of following is incorrect?
The correct answer is:
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physics-
Consider radioactive decay of A to B which , further decays either to X or Y, and
are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are , zero and zero respectively are the number of nuclei of A,B,X and Y are at any instant t.
The number of nuclei of B will first increase and then after a maximum value, it decreases for
Consider radioactive decay of A to B which , further decays either to X or Y, and are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are , zero and zero respectively are the number of nuclei of A,B,X and Y are at any instant t.
The number of nuclei of B will first increase and then after a maximum value, it decreases for
physics-General
physics-
Consider radioactive decay of A to B which , further decays either to X or Y, and are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are , zero and zero respectively are the number of nuclei of A,B,X and Y are at any instant t.
The net rate of accumulation of B at any instant is
Consider radioactive decay of A to B which , further decays either to X or Y, and are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are , zero and zero respectively are the number of nuclei of A,B,X and Y are at any instant t.
The net rate of accumulation of B at any instant is
physics-General
physics-
The mass of nucleus 
is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if 
Also two light nuclei of mass m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if 
The masses of some netural atoms are given in the table below.
The kinetic energy (in keV) of the alpha particle, when the nucleus at rest undergo alpha decay, is
The mass of nucleus is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if Also two light nuclei of mass m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if The masses of some netural atoms are given in the table below.
The kinetic energy (in keV) of the alpha particle, when the nucleus at rest undergo alpha decay, is
physics-General
physics-
The mass of nucleus is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if Also two light nuclei of mass m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if The masses of some netrural atoms are given in the table below.
The correct statement is
The mass of nucleus is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if Also two light nuclei of mass m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if The masses of some netrural atoms are given in the table below.
The correct statement is
physics-General
physics-
From the figure describing photoelectric effect we may infer correctly that
From the figure describing photoelectric effect we may infer correctly that
physics-General
physics-
Figure represents a graph of kinetic energy of most energetic photoelectrons, Kmax (in eV), and frequency (v) for a metal used as cathode in photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is
Figure represents a graph of kinetic energy of most energetic photoelectrons, Kmax (in eV), and frequency (v) for a metal used as cathode in photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is
physics-General
chemistry-
OxidationstateofFeincompound(F)is:
OxidationstateofFeincompound(F)is:
chemistry-General
chemistry-
Compound(A)is:
Compound(A)is:
chemistry-General
chemistry-
An aqueous solution of an inorganic compound (X)givesthe followingreactions:
i) Withan aqueous solutionof 
,aprecipitateinsolubleindiluteHClisobtained
ii) Addition of excess of KI gives a brown precipitate which turns white on addition of excess hypo solution
iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt is obtained.
Identify X-
An aqueous solution of an inorganic compound (X)givesthe followingreactions:
i) Withan aqueous solutionof ,aprecipitateinsolubleindiluteHClisobtained
ii) Addition of excess of KI gives a brown precipitate which turns white on addition of excess hypo solution
iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt is obtained.
Identify X-
chemistry-General
chemistry-
Findout (F) :
Findout (F) :
chemistry-General
chemistry-
Findout(E):
Findout(E):
chemistry-General
chemistry-
Find the anion(s):
Find the anion(s):
chemistry-General
physics-
In a photoelectric experiment the relation between applied potential difference between cathode and anode V and the photoelectric current I was found to be shown in graph below. If Planck’s constant 
, the frequency of incident radiation would be nearly 
In a photoelectric experiment the relation between applied potential difference between cathode and anode V and the photoelectric current I was found to be shown in graph below. If Planck’s constant , the frequency of incident radiation would be nearly
physics-General
physics-
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers Each transformer has two coils of wire electrically insulated from each other but wound around a common core of ferromagnetic material The two wires are close together but do not touch each other.
The primary coil is connected to a source of alternating (AC) current The secondary coil is connected to a resistor such as a light bulb The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material This in turn induces an oscillating voltage and AC current in the secondary coil Student collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers
The primary coil of a transformer has 100 turns and is connected to a 120V AC source How many turns are in the secondary coil if there is a 2400 V across it
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers Each transformer has two coils of wire electrically insulated from each other but wound around a common core of ferromagnetic material The two wires are close together but do not touch each other.
The primary coil is connected to a source of alternating (AC) current The secondary coil is connected to a resistor such as a light bulb The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material This in turn induces an oscillating voltage and AC current in the secondary coil Student collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers
The primary coil of a transformer has 100 turns and is connected to a 120V AC source How many turns are in the secondary coil if there is a 2400 V across it
physics-General
physics-
At resonance, VL and VC are both very much greater than the applied potential, V itself The quality factor for an LCR circuit in resonance is given by 
In practice
has been achieved
At resonance, the capacitor has been adjusted for
At resonance, VL and VC are both very much greater than the applied potential, V itself The quality factor for an LCR circuit in resonance is given by In practice has been achieved
At resonance, the capacitor has been adjusted for
physics-General
