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Thu Apr 17, 2014 3:03 pm  

Ans: java.lang.Exception: The input exceeds the limit of 3072 characters of length.

Thu Apr 17, 2014 11:52 am  

Ans: In metallic conductors, free electrons are carriers of electricity and hence electrons constitute the electric current. Since electrons are negatively charged, they are attracted towards the positive terminal of the battery. Hence, direction of flow of electrons is always from negative to positive.   In an electric circuit, the direction of conventional current is always taken from the positive to negative terminal of the battery.    Hence, the direction of conventional electric current is in the opposite direction of electron flow.

Thu Apr 17, 2014 10:27 am  

Ans:

Wed Apr 16, 2014 10:32 pm  

Ans: Yes, Tungsten conducts electricity. Pure tungsten has s properties including the high resistivity, highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonly used material for light bulb filaments. It can reach high temperature before melting and therefore emit a brighter light 

Wed Apr 16, 2014 9:55 pm  

Ans: Blood is a fluid connective tissue contained in the heart and blood vessels of the circulatory system. Importance of blood: Blood forms a clot which serves to prevent the loss of blood and the entry of disease-causing germs. It transports digested food from the alimentary canal to the tissues. Blood helps in keeping the temperature of the body uniform by distributing heat. It transports excretory materials from the tissues to the liver, kidneys or skin for elimination. Endocrine glands secrete hormones into the blood so that they are transported to target sites. Haemoglobin is a respiratory pigment present in the stroma of RBCs. It is formed of an iron-containing part haemin and a protein globin. It combines readily with oxygen to form an unstable compound oxyhaemoglobin. This compound delivers oxygen to tissues. Hb + O 2 = Hb.O 2 (Oxyhaemoglobin) Haemoglobin can carry a very small quantity of carbon dioxide in the form of carbaminohaemoglobin. Hb + CO 2 = Hb.CO 2 (Carbaminohaemoglobin)

Wed Apr 16, 2014 7:28 pm  

Ans: w r i t e space a n y space f r a c t i o n a l space n u m b e r space w h i c h space i s space g r e a t e r space t h a n space 3 space a n d space l e s s space t h a n space 4 space a n d space a l s o space d o e s space n o t space h a v e space r e p e t a t i v e space p a r t s space  i. e space 3.45547865457 comma space 3.789436 comma space 3.789431 comma space 3.571522456 space

Wed Apr 16, 2014 6:57 pm  

Ans: A precipitation reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid. That insoluble compound is called a precipitate. Example : When lead nitrate is treated with sulphuric acid , a white precipitate of lead sulphate is formed. Pb(NO 3 ) 2 + H 2 SO 4     →    PbSO 4   + 2HNO 3

Wed Apr 16, 2014 6:45 pm  

Ans: PV = nRT P 1 V 1 = n 1 RT 1 P 2 V 2 = n 2 RT 2 P 1 = P 2 = P P = n 1 RT 1 / V 1 and P = n 2 RT 2 / V 2 T 2 = 2 T 1 , V 1 = 100 L,  n 1 = 3 moles and n 2 = 1.5 moles n 1 T 1 / V 1 = n 2 x 2T 1 / V 2 3/100  =  1.5 x 2 / V 2 V 2 = 1.5 x 2 x 100 / 3 V 2 = 100 L   The new volume is 100 L .

Wed Apr 16, 2014 6:42 pm  

Ans: Dear prabpareek

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability.

Regards

Topperlearning Team.

Wed Apr 16, 2014 6:37 pm  

Ans: can not be determined as there are two variables x, y and one equation.   For getting the answer we must have atleast one more equation or a condition. 

Wed Apr 16, 2014 5:23 pm  

Ans: Let the equation of a line is ax + by + c = 0 and image of a point P space open parentheses x subscript 1 comma space y subscript 1 close parentheses space i s space Q open parentheses x subscript 2 comma space y subscript 2 close parentheses     fraction numerator x subscript 2 minus x subscript 1 over denominator a end fraction equals fraction numerator y subscript 2 minus y subscript 1 over denominator b end fraction equals minus fraction numerator 2 open parentheses a x subscript 1 plus b y subscript 1 plus c close parentheses over denominator a squared plus b squared end fraction

Wed Apr 16, 2014 4:24 pm  

Ans: A combination of two conductors placed close to each other is called a capacitor. One of the conductors is given a positive charge +Q and the other is given an equal negative charge –Q. The conductor with positive charge is called positive plate and the conductor with negative charge is called negative plate. The potential difference between two plates is called the potential of the capacitor. The positive plate is at a potential V + and the other is at potential V -. Hence, potential of the capacitor is , V = V + - V -

Wed Apr 16, 2014 3:52 pm  

Ans: It is the favourable condition that is mentioned on the arrow between the reactants and products. Over here pressure of about 340 atm. or 300 atm. is   required to carry out required reaction. Consider the following reaction given below.   Favourbale conditions: Temperature : Optimum temp. is 450-500 0 C Pressure : Above 200 atm. Catalyst : Finely divided iron

Wed Apr 16, 2014 2:54 pm  

Ans: Dear Samson

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability.

Regards

Topperlearning Team.

Wed Apr 16, 2014 2:30 pm  

Ans: D equals open curly brackets 1 comma space 3 comma space 5 comma space 7 comma space 9 close curly brackets

Wed Apr 16, 2014 1:26 pm  

Ans: java.lang.Exception: The input exceeds the limit of 3072 characters of length.

Wed Apr 16, 2014 1:25 pm  

Ans: Take two of the given equations and solve for x and y , then substitute the values in the third equation.

Wed Apr 16, 2014 11:30 am  

Ans: Action and reaction pair always act on two different objects that are in contact. They have equal magnitude and always act in the opposite directions.   Hence, (A), (B) and (C) are correct and (D) is incorrect.

Wed Apr 16, 2014 8:09 am  

Ans: (i) 5 x minus 2 over 3 minus 7 x minus 1 greater than x over 4 minus 2 x minus 5 over 3 greater than x over 4 minus 5 over 3 greater than fraction numerator 9 x over denominator 4 end fraction x less than minus 20 over 27 rightwards double arrow x space element of left parenthesis minus infinity comma minus 20 over 27 right parenthesis       (ii) 2 x minus 3 over 4 plus 8 greater or equal than 2 plus fraction numerator 4 x over denominator 3 end fraction fraction numerator 2 x over denominator 3 end fraction greater or equal than minus 21 over 4 x greater or equal than minus 63 over 8 rightwards double arrow x element of left square bracket minus 63 over 8 comma infinity right square bracket

Wed Apr 16, 2014 7:45 am  

Ans: There are no certainties in any examination as to which questions might come, however the following derivations are very important from the exam point of view:   1) Expression of current density in the form of Ohm's law 2) Equivalent resistance of a combination of resistors in series or parallel 3) The balance condition in a wheatstone bridge 4) Internal resistance of a cell by potentiometer
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