Let S be a finite set containing n elements. Then the total number of binary operations on S is:

Anonymous User Maths 23 Apr, 2020 68 views

An equation of the plane passing through the points (3,2,–1),(3,4,2)and(7,0,6) is 5x+3y–2z= ,where  is

Anonymous User Maths 23 Apr, 2020 69 views

A stone is dropped into a quiet lake and waves move in a circle at a speed of 3.5 cm/sec. At the instant when the radius of the circular wave is 7.5 cm. How fast is the enclosed area increasing?

Anonymous User Maths 23 Apr, 2020 60 views

A dice is tossed 5 times. Getting an odd number is considered a success. Then the variance of distribution of success is

Anonymous User Maths 23 Apr, 2020 63 views

Total number of possible matrices of order 3 × 3 with each entry 2or 0 is

Anonymous User Maths 23 Apr, 2020 58 views

A drunken man takes a step forward with probability 0.4 and backwards with probability 0.6. Find the probability that at the end of eleven steps, he is one step away from the starting point.

Anonymous User Maths Probability 23 Apr, 2020 61 views

The resistance of 0.01 N solution of an electrolyte was found to be 220 ohm at 298 K using a conductivity cell with a cell constant of 0.88cm–1. The value of equivalent conductance of solution is –

Anonymous User Chemistry 23 Apr, 2020 149 views

Though the five d-orbitals are degenerate, the first four d-orbitals are similar to each other in shape whereas the fifth d-orbital is different from others. What is the designation of the fifth orbital?

Anonymous User Chemistry 23 Apr, 2020 79 views

How many P–H and O–H bonds respectively, are present in molecule?

Anonymous User Chemistry 23 Apr, 2020 85 views

The correct order of boiling points of 2, 2-dimethylpropane, 2-methylbutane and n-pentane is

Anonymous User Chemistry 23 Apr, 2020 97 views

The half life of a first order reaction is 10 min. If initial amount is 0.08 mol L-1 and concentration at some instant is 0.01 mol L-1. What is the time elapsed ?

Anonymous User Chemistry 23 Apr, 2020 118 views

Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :

Anonymous User Chemistry 23 Apr, 2020 75 views

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be

Anonymous User Chemistry 23 Apr, 2020 77 views

Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?

Anonymous User Chemistry 23 Apr, 2020 70 views

If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:

Anonymous User Chemistry 23 Apr, 2020 419 views

An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?

Anonymous User Chemistry 23 Apr, 2020 101 views

A fire of lithium, sodium and potassium can be extinguished by

Anonymous User Chemistry 23 Apr, 2020 69 views

Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :

Anonymous User Chemistry 23 Apr, 2020 66 views

Which is not true for beryllium ?

Anonymous User Chemistry 23 Apr, 2020 368 views

The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.

Anonymous User Chemistry 23 Apr, 2020 111 views

Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?

Anonymous User Chemistry 22 Apr, 2020 82 views

If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:

Anonymous User Chemistry 22 Apr, 2020 99 views

An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?

Anonymous User Chemistry 22 Apr, 2020 107 views

A fire of lithium, sodium and potassium can be extinguished by

Anonymous User Chemistry 22 Apr, 2020 67 views

Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :

Anonymous User Chemistry 22 Apr, 2020 64 views

Which is not true for beryllium ?

Anonymous User Chemistry 22 Apr, 2020 98 views

The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.

Anonymous User Chemistry 22 Apr, 2020 74 views

Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :

Anonymous User Chemistry 22 Apr, 2020 125 views

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be

Anonymous User Chemistry 22 Apr, 2020 67 views

Exactly 2 machines out of 4 are faulty. They are tested one by one in a random order till both the faulty machines are identified. Then, the probability that only two tests are required is :

Anonymous User Maths Probability 22 Apr, 2020 61 views

Two dice are thrown together. Then the probability, that the sum of numbers appearing on them is a prime number, is

Anonymous User Maths Probability 22 Apr, 2020 67 views

A school has four sections of chemistry in class XII having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the four sections, the over all average of marks per students is

Anonymous User Maths 22 Apr, 2020 67 views

If the latusrectum of an ellipse with axis along X-axis and centre at origin is 10 and distance between foci is length of minor axis, then the equation of the ellipse is

Anonymous User Maths 22 Apr, 2020 60 views

The coefficient of x4 in the expansion of

Anonymous User Maths 22 Apr, 2020 64 views

Locus of the points which are at equal distance from 3x + 4y – 11 = 0 and 12x + 5y + 2 = 0 and which is near the origin is

Anonymous User Maths 22 Apr, 2020 357 views

The sum of the series 3.6 + 4.7 + 5.8 + ......upto (n – 2) terms is?

Anonymous User Maths 22 Apr, 2020 108 views

if  3f(x) - f(1 / x)  =  , then

Anonymous User Maths 22 Apr, 2020 62 views

The function f(x) = log (1 +x / 1 -x) stisfies the equation

Anonymous User Maths 22 Apr, 2020 58 views

Ethyl isocyanide on hydrolysis in acidic medium generates

Anonymous User Chemistry 21 Apr, 2020 73 views

When primary amine reacts with chloroform in 5. ethanolic KOH then the product is

Anonymous User Chemistry 21 Apr, 2020 65 views

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is

Anonymous User Chemistry 21 Apr, 2020 65 views

The smog is essentially caused by the presence of

Anonymous User Chemistry 21 Apr, 2020 70 views

Which one of the following types of drugs reduces fever?

Anonymous User Chemistry 21 Apr, 2020 59 views

Let R={(1,3),(4,2),(2,4),(2,3),(3,1)}be a relation on the set A = {1, 2, 3, 4}. The relation R is

Anonymous User Maths Set, Relations and Functions 21 Apr, 2020 59 views

Two lenses of power –15 D and +5 D are in contact with each other. What will be the focal length of the combination?

Anonymous User Physics Ray Optics 21 Apr, 2020 94 views

The two functional groups present in a typical 29. 30. carbohydrate are?

Anonymous User Chemistry Biomolecules 20 Apr, 2020 70 views