Chemistry-
General
Easy
Question
The packing efficiency of the two-dimensional square unit cell shown below is:
- 39.27%
- 68.02%
- 74.05%
- 78.54%
The correct answer is: 78.54%
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chemistry-
The volume-temperature 'graphs of a given mass of an ideal gas at constant pressures are shown below. What is the correct order of pressures?
The volume-temperature 'graphs of a given mass of an ideal gas at constant pressures are shown below. What is the correct order of pressures?
chemistry-General
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For measuring depth of a beaker using verniercallipers observed readings are given as If zero error is - 0.03cm, then mean corrected depth is
For measuring depth of a beaker using verniercallipers observed readings are given as If zero error is - 0.03cm, then mean corrected depth is
physics-General
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The n th division of main scale coincides with 
division of vernierscale Given+n one main scale division is equal to 'a' units The least count of vernier is
The n th division of main scale coincides with division of vernierscale Given+n one main scale division is equal to 'a' units The least count of vernier is
physics-General
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The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) 
charge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
For a = 0, the value of d(maximum value of 
as shown in the figure) is :
The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) charge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
For a = 0, the value of d(maximum value of as shown in the figure) is :
physics-General
physics-
The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) charge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
The electric field at r = R is :
The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) charge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
The electric field at r = R is :
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.
At 
, which of following is incorrect?
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?
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 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
