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Chemistry-

General

Easy

Question

What are types of following semiconductors I and II

$I \Rightarrow p$ -type $, I I \Rightarrow n$ -type
$I \Rightarrow n$ -type $, I I \Rightarrow p$ -type
Both $n$ -type
Both $p$ -type

The correct answer is: $I rightwards double arrow n$ -type $comma blank I I rightwards double arrow p$ -type

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What type of crystal defect is indicated in the diagram given below

What type of crystal defect is indicated in the diagram given below

chemistry-General

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

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

parallel

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

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

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 $x to the power of 2 end exponent equals a y$ . If the coefficient of friction is $mu$ , 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 $x to the power of 2 end exponent equals a y$ . If the coefficient of friction is $mu$ , the highest distance above the x-axis at which the particle will be in equilibrium is

physics-General

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Two block of masses $m subscript 1 end subscript$ and $m subscript 2 end subscript$ 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 $mu$ .

Two block of masses $m subscript 1 end subscript$ and $m subscript 2 end subscript$ 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 $mu$ .

physics-General

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

For $x element of R comma 3 c o s invisible function application left parenthesis 4 x minus 5 right parenthesis plus 4$ lies in the interval

For $x element of R comma 3 c o s invisible function application left parenthesis 4 x minus 5 right parenthesis plus 4$ lies in the interval

parallel

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? $A B C$

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? $A B C$

chemistry-General

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

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 $S i O subscript 2 end subscript comma$ the most common of which is quartz. Quartz is a framework silicate with $S i O subscript 4 end subscript$ 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 $S i O subscript 2 end subscript comma$ the most common of which is quartz. Quartz is a framework silicate with $S i O subscript 4 end subscript$ 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

parallel

Study the following sequence of reactions:

$A$ is

Study the following sequence of reactions:

$A$ is

chemistry-General

A particle is moved from (0, 0) to (a, a) under a force $stack F with rightwards arrow on top equals open parentheses 3 stack i with tilde on top plus 4 stack j with rightwards arrow on top close parentheses blank$ from two paths. Path 1 is OP and path 2 is OQP. Let $W subscript 1 end subscript$ and $W subscript 2 end subscript$ 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 $stack F with rightwards arrow on top equals open parentheses 3 stack i with tilde on top plus 4 stack j with rightwards arrow on top close parentheses blank$ from two paths. Path 1 is OP and path 2 is OQP. Let $W subscript 1 end subscript$ and $W subscript 2 end subscript$ be the work done by this force in these two paths. Then:
S

physics-General

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 $m divided by s to the power of 2 end exponent$ 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 $square root of 3 blank$ 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 $m divided by s to the power of 2 end exponent$ 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 $square root of 3 blank$ seconds is:

physics-General

parallel

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