Dear Reader,
Below are three problems based on the calculations of time and flow of water.

Question 1

Dear Reader,
Below are three questions on numbers on concepts dealing with odd and even and a new class called "even-odd" numbers.

Question 1

If n is an even-odd number then which of the following must be false?
(A number is called "even-odd" if it is halfway between an even integer and an odd integer.)

Dear Reader,
Below are three problems on work and time for your practice.

Question 1

A can do a piece of work in 100 days, B and C together can do the same work in 20 days. If B can do the work in same time as that of C and A together then how long C alone can do the same work?
a)100 days b)50days c)25days d)20 days

Answer : b)50 days

Dear Reader,
Below are three interesting problems on Games and Races.

Points to remember :

Suppose A and B are two contestants in a race. Before the start of the race, if A is at the starting point and B is ahead of A by 12 meters, then we say that 'A gives B, a start of 12 meters'.

Dear reader,
Below are three problems which are dealing with the concept of straight lines, slope and points on the lines.

Question 1

Find the value of P when the line through the points (2,2) and (5,7) is perpendicular to the line 3x+Py-9=0.
a)3/5 b)5 c)5/3 d)3

Answer : b)5

Solution:

Dear Reader, Below are 3 missing number problems for your practice.

Question 1

Find the missing number in 25, 38, _, 64, -27, 90

a) -1 b) 51 c) 39 d) -32

Answer : a) -1

Solution :

Closely analyzing the given series, it follows a pattern as shown below :

Dear Reader,

Below are three problems which are based on triangle, square and circle.

Question 1

A circle has 4 equal-length chords such that the points of intersection form a square and the diagonals of the square are the diameter of the circle, the number of points equidistant from all the 4 chords is
a)1 b)2 c) 0 d) 4

Answer : a)1

Dear Reader,
Below are three problems dealing with product and addition of the irrational roots of some non-linear equations.

Question 1

What is the sum of the irrational roots of the equation (x-1)(x-3)(x-5)(x-7)=9 ?
a)10 b)8 c)6 d)4

Answer : b)8

Solution:

Given that
(x - 1) (x - 3) (x - 5) (x - 7) = 9

Below are 4 DBMS based interview questions for your practice.

Question 1

(In DBMS like Oracle) Which of the following allow null values ? A Unique Key or Primary Key ?

Answer :

Primary Key constraint does not allow null values to be inserted while it is legal in case of Unique key.

Question 2

Dear Reader,

Very often you can expect basic C programs using recursive algorithms in interviews of leading companies like HCL. Below are few for your practice.

Question 1

In C programs, if a function calls itself within its definition, what can you say about that function?

Answer :

Such functions are called Recursive functions.