Chemistry-
General
Easy
Question
What type of crystal defect is indicated in the diagram given below
- Both Frenkel and Schottky defects
- Schottky defect
- Interstitial defect
- Frenkel defect
The correct answer is: Schottky defect
Since equal number of cations
and anions 
are missing in the figure given, so it Schottky defect
Related Questions to study
physics-
A force F = t is applied to a block A as shown in figure, where t is time in seconds. The force is applied at t = 0 seconds when the system was at rest. Which of the following graph correctly gives the frictional force between A and horizontal surface as a function of time t.[Assume that at t = 0, tension in the string connecting the two blocks is zero]
A force F = t is applied to a block A as shown in figure, where t is time in seconds. The force is applied at t = 0 seconds when the system was at rest. Which of the following graph correctly gives the frictional force between A and horizontal surface as a function of time t.[Assume that at t = 0, tension in the string connecting the two blocks is zero]
physics-General
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The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal force F is applied to hold m against M that is equal to :
The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal force F is applied to hold m against M that is equal to :
physics-General
physics-
The coefficient of friction between 4kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1 respectively. Choose the correct statement:
The coefficient of friction between 4kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1 respectively. Choose the correct statement:
physics-General
physics-
In the shown arrangement if f1 , f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respectively, then their values are:
In the shown arrangement if f1 , f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respectively, then their values are:
physics-General
physics-
A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation is 
. If the coefficient of friction is 
, the highest distance above the x-axis at which the particle will be in equilibrium is
A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation is . If the coefficient of friction is , the highest distance above the x-axis at which the particle will be in equilibrium is
physics-General
physics-
Two block of masses 
and 
are connected with a massless unstretched spring and placed over a plank moving with an acceleration ‘a’ as shown in figure. The coefficient of friction between the blocks and platform is .
Two block of masses and are connected with a massless unstretched spring and placed over a plank moving with an acceleration ‘a’ as shown in figure. The coefficient of friction between the blocks and platform is .
physics-General
physics-
In the arrangement shown in the figure mass of the block B and A are 2m,, 8m respectively. Surface between B and floor is smooth. The block B is connected to block C by means of a pulley. If the whole system is released then the minimum value of mass of the block C so that the block A remains stationary with respect to B is : (Co-efficient of friction between A and B is m.)
In the arrangement shown in the figure mass of the block B and A are 2m,, 8m respectively. Surface between B and floor is smooth. The block B is connected to block C by means of a pulley. If the whole system is released then the minimum value of mass of the block C so that the block A remains stationary with respect to B is : (Co-efficient of friction between A and B is m.)
physics-General
maths-
For 
lies in the interval
For lies in the interval
maths-General
chemistry-
The following flow diagram represents the industrial preparation of nitric acid from ammonia
Answer the questions given below
Which line of entry describes the undefined reagents, products and reaction conditions? 
The following flow diagram represents the industrial preparation of nitric acid from ammonia
Answer the questions given below
Which line of entry describes the undefined reagents, products and reaction conditions?
chemistry-General
chemistry-
Questions given below are based on the following experiment An oxyacid of phosphorus has the following properties Complete neutralization of the acid with sodium hydroxide solution gives an aqueous solution of sodium ion and oxy-acid anions in the ratio 2:1. When a solution of the acid is warmed with silver nitrate solution metallic silver is deposited What is the structure of the oxy-acid?
Questions given below are based on the following experiment An oxyacid of phosphorus has the following properties Complete neutralization of the acid with sodium hydroxide solution gives an aqueous solution of sodium ion and oxy-acid anions in the ratio 2:1. When a solution of the acid is warmed with silver nitrate solution metallic silver is deposited What is the structure of the oxy-acid?
chemistry-General
chemistry-
Read the following short write-up and answer the questions at the end of it The name ‘silica’ covers an entire group of minerals, which have the general formula 
the most common of which is quartz. Quartz is a framework silicate with 
tetrahedra arranged in spirals. The spirals can turn in a clockwise or anti-clockwise direction 
a feature that results in there being two mirror images, optically active, varieties of quartz The following pictures represent various silicate anions. Their formulae are respectively
Read the following short write-up and answer the questions at the end of it The name ‘silica’ covers an entire group of minerals, which have the general formula the most common of which is quartz. Quartz is a framework silicate with tetrahedra arranged in spirals. The spirals can turn in a clockwise or anti-clockwise direction a feature that results in there being two mirror images, optically active, varieties of quartz The following pictures represent various silicate anions. Their formulae are respectively
chemistry-General
chemistry-
Study the following sequence of reactions:
is
Study the following sequence of reactions:
is
chemistry-General
physics-
A particle is moved from (0, 0) to (a, a) under a force 
from two paths. Path 1 is OP and path 2 is OQP. Let 
and 
be the work done by this force in these two paths. Then:
S
A particle is moved from (0, 0) to (a, a) under a force from two paths. Path 1 is OP and path 2 is OQP. Let and be the work done by this force in these two paths. Then:
S
physics-General
physics-
In the figure shown all the surfaces are frictionless, and mass of the block, m = 1 kg. The block and wedge are held initially at rest. Now wedge is given a horizontal acceleration of 10 
by applying a force on the wedge, so that the block does not slip on the wedge. Then work done by the normal force in ground frame on the block in 
seconds is:
In the figure shown all the surfaces are frictionless, and mass of the block, m = 1 kg. The block and wedge are held initially at rest. Now wedge is given a horizontal acceleration of 10 by applying a force on the wedge, so that the block does not slip on the wedge. Then work done by the normal force in ground frame on the block in seconds is:
physics-General
physics-
With what minimum velocity 
should block be projected from left end A towards end B such that it reaches the other end B of conveyer belt moving with constant velocity v? Friction coefficient between block and belt is .
With what minimum velocity should block be projected from left end A towards end B such that it reaches the other end B of conveyer belt moving with constant velocity v? Friction coefficient between block and belt is .
physics-General
