Physics
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Question

3 Particle each of mass  are kept at vertices of an equilateral triangle of side L. The gravitatioml field at center due to these particles is……

  1. Zero
  2. fraction numerator 3 G M over denominator L squared end fraction
  3. fraction numerator 12 over denominator square root of 3 end fraction space fraction numerator G m over denominator L squared end fraction

The correct answer is: Zero

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Given mass of the moon is 1 over 81 of the mass of the earth and corresponding radius is 1 fourth  of the earth, If escape velocity on the earth surface is 11.2kms-1 the value of same on the surface of moon is.....kms-1

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The escape velocity of a body on the surface of the earth is 11.2km/sec. If the mass of the earth is increases to twice its present value and the radius of the earth becomes half, the escape velocity becomes...kms-1

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The escape velocity of a planet having mass 6 times and radius 2 times as that of earth is.........

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Correct statements from the graph

I) Above 1073K, capital delta G to the power of 0 end exponent for the formation of Fe2O3 is less negative than capital delta G to the power of 0 end exponent for the formation of CO from carbon
II) Above 1073K, Carbon can reduce Fe2O3
III) Below 1073K, CO can reduce Fe2O3
IV) In blast furnace, reduction of Fe2O3 occurs in different temperature ranges with below 1073K by CO (or) above 1073K by carbon

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I) Above 1073K, capital delta G to the power of 0 end exponent for the formation of Fe2O3 is less negative than capital delta G to the power of 0 end exponent for the formation of CO from carbon
II) Above 1073K, Carbon can reduce Fe2O3
III) Below 1073K, CO can reduce Fe2O3
IV) In blast furnace, reduction of Fe2O3 occurs in different temperature ranges with below 1073K by CO (or) above 1073K by carbon

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From the graph, which is the best reducing agent to reduce Cu2 O at high temperature

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Correct statement(s) regarding the graph

I) Above 983K, Carbon can reduce any metal oxide at high temperature and itself oxidised to CO
II) In the first reaction (Formation of CO2 from ‘C’) capital delta S to the power of 0 end exponent=0 & capital delta G to the power of 0 end exponentremains nearly same, i.e it is independent of temperature
III) In the second reaction, (formation of CO) , there is increase in entropy & capital delta S to the power of 0 end exponent=+ve&blank capital delta G to the power of 0 end exponent becomes more –ve with increase in temperature
IV) In third reaction (formation of CO2 from CO), there is a decrease in entropy capital delta S to the power of 0 end exponent=-ve & capital delta G to the power of 0 end exponent becomes less –ve with increase in temperature

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II) In the first reaction (Formation of CO2 from ‘C’) capital delta S to the power of 0 end exponent=0 & capital delta G to the power of 0 end exponentremains nearly same, i.e it is independent of temperature
III) In the second reaction, (formation of CO) , there is increase in entropy & capital delta S to the power of 0 end exponent=+ve&blank capital delta G to the power of 0 end exponent becomes more –ve with increase in temperature
IV) In third reaction (formation of CO2 from CO), there is a decrease in entropy capital delta S to the power of 0 end exponent=-ve & capital delta G to the power of 0 end exponent becomes less –ve with increase in temperature

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