Physics-
General
Easy
Question
A block of mass M on a horizontal smooth surface is pulled by a load of mass M/2 by means of a rope AB and string BC as shown in the figure. The length & mass of the rope AB are L and M/2 respectively. As the block is pulled from AB = L to AB = 0 its acceleration changes from
The correct answer is:
Related Questions to study
physics-
Block of 1 kg is initially in equilibrium and is hanging by two identical springs A and B as shown in figures. If spring A is cut from lower point at t=0 then, find acceleration of block in 
at t = 0
Block of 1 kg is initially in equilibrium and is hanging by two identical springs A and B as shown in figures. If spring A is cut from lower point at t=0 then, find acceleration of block in at t = 0
physics-General
physics-
Find the acceleration of 3 kg mass when acceleration of 2 kg mass is 
as shown in figure
Find the acceleration of 3 kg mass when acceleration of 2 kg mass is as shown in figure
physics-General
physics-
Both the blocks shown here are of mass m and are moving with constant velocity in direction shown in a resistive medium which exerts equal constant force on both blocks in direction opposite to the velocity. The tension in the string connecting both of them will be : (Neglect friction)
Both the blocks shown here are of mass m and are moving with constant velocity in direction shown in a resistive medium which exerts equal constant force on both blocks in direction opposite to the velocity. The tension in the string connecting both of them will be : (Neglect friction)
physics-General
physics-
What should be the minimum force P to be applied to the string so that block of mass m just begins to move up the frictionless plane
What should be the minimum force P to be applied to the string so that block of mass m just begins to move up the frictionless plane
physics-General
chemistry-
Metallic gold frequently is found in aluminosilicate rocks and its is finely dispersed among other minerals. It may be extracted by trating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2 ] – , which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4 ] 2–. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
The correct reaction involved in the leaching of gold with dilute solution of NaCN is :
Metallic gold frequently is found in aluminosilicate rocks and its is finely dispersed among other minerals. It may be extracted by trating the crushed rock with aerated potassium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)2 ] – , which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to [Zn(CN)4 ] 2–. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution. Silver occurs as native as well as sulphurised ore.
The correct reaction involved in the leaching of gold with dilute solution of NaCN is :
chemistry-General
chemistry-
Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from theirs ores involves the following processes.
i) Concentration
ii) Calcination | roasting | leaching
iii) Reduction It is carried out by one of the following methods.
Minerals from which metals can be extracted economically and easily are called ores. The extraction of metals from theirs ores involves the following processes.
i) Concentration
ii) Calcination | roasting | leaching
iii) Reduction It is carried out by one of the following methods.
chemistry-General
chemistry-
The chemical composition of “slag” formed during the smelting process in the extraction of copper is :
The chemical composition of “slag” formed during the smelting process in the extraction of copper is :
chemistry-General
chemistry-
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:
chemistry-General
chemistry-
Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 
are added to lower the fusion temperature and to increase the conductance.
Electrolysis of fused MgCl2 
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is
Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio are added to lower the fusion temperature and to increase the conductance.
Electrolysis of fused MgCl2
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is
chemistry-General
chemistry-
Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio are added to lower the fusion temperature and to increase the conductance.
Electrolysis of fused MgCl2 
electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
2 This reaction indicates :
Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio are added to lower the fusion temperature and to increase the conductance.
Electrolysis of fused MgCl2
electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
2 This reaction indicates :
chemistry-General
chemistry-
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?
Extraction of Aluminium can be understand by : electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?
chemistry-General
chemistry-
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains 
but only Al gets deposited at cathode because :
Extraction of Aluminium can be understand by : electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains but only Al gets deposited at cathode because :
chemistry-General
chemistry-
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :
Extraction of Aluminium can be understand by : electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :
chemistry-General
chemistry-
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite)
Cathode : Graphite inside the Fe container
Anode : Graphite rods
Coke powder is spreaded over the molten electrolyte due to :
Extraction of Aluminium can be understand by : electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite)
Cathode : Graphite inside the Fe container
Anode : Graphite rods
Coke powder is spreaded over the molten electrolyte due to :
chemistry-General
chemistry-
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The purpose of adding cryolite is :
Extraction of Aluminium can be understand by : electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The purpose of adding cryolite is :
chemistry-General
