Goforexam.in Guide for Placements, Interview, Aptitude Test...

Below are three problems on linear equations. You have to form the equations by using the given information. Question 1 A railway half ticket( for kids below 5 years) costs Rs. 150 and full ticket(for above 5 years) costs Rs. 250. The daily report says that for a particular day, 5000 passengers have travelled and the total collection is Rs.10,50,000. How many kids(below 5 years) have travelled on that day? a)1000 b)2000 c)2500 d)3500 Answer : b)2000 Solution: Let 's' be the number of kids travelled on that day and 'b' be the number of passengers(above 5 years) travelled on that day. Therefore, s + b = 5000 ... eqn (1) Each half ticket's cost is Rs.150 and Each full ticket's cost is Rs.250. Total collection of amount = 150s + 250b = 10,50,000 Or 150s + 250b = 10,50,000 ... eqn (2) Multiplying equation (1) by 150, we get 150s + 150b = 7,50,000 ... eqn (3) Subtracting eqn (3) from eqn (2), we get 100b = 3,00,000 Or b = 3000 We know that s + b =...

You could had prepared well for interviews, you could literally be aware of every question that would be fired upon you in an interview, you could had completed your placement test successfully well, but during the interviews most of the students tend to get nervous. If you can cover up your nervousness and if you can still answer the questions well, then it might do good. But, in most cases, nervousness affects your ability to listen well. When you fail to listen well, the chances are that you performance could degrade as well. Knowing the root cause of this unusual nervousness can get you to overcome this feeling. What is the root cause of sudden decrease in confidence levels during interviews? Most of the sufferers have in common a culprit within themselves. This is called 'being overly self conscious'. This arises due to the fear of getting into embarrassing situations. Several CV readers do mail us about this problem and among them 9 out of 10 would fall int...

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.) a) n/2 is not an integer b)(2n) 2 is an integer c)4n is an odd integer d)none of these Answer : c)4n is an odd integer Solution: A number is called "even-odd" if it is halfway between an even integer and an odd integer. For example, consider an even integer 10 and an odd integer -5. Number halfway between them will be (10 - (-5)) / 2 = 7.5. Here 7.5 is an "even-odd" number. i.e., an even-odd number will be in the form x + 1/2 = x.5 where x is any integer. Let us see with each option: Consider option a : Since n is a fraction number then n/2 is also a fraction. i.e., n/2 is not an integer. Hence option a is true. Consider option b :...

You need to be aware of some of the common resume mistakes that freshers often commit that could play spoilsport to a magnitude you can't imagine. Yes, you could miss golden opportunities due to any of the below discussed mistakes. Mistake 1 : Not Updating Resumes Periodically Our life changes everyday and resume is not an exception. Every day, every week and every month you are new person with your skill sets getting upgraded. You should take care that your resume closely resembles your current skill set. For example, you could be strong in C basics during last week. But during the current week you could had completed reading C pointers and data structures to gain a little mastery over C. Now just think the dampening role that your resume could play if it still reads "C Basics". Employers don't have magic mirrors that could reveal your exact skill set. Hence updating resumes on a weekly basis is very important. Mistake 2 : Not Having Resume Saved...

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 Considering an Oracle database as an example, can NULL values be used in arithmetic operations ? Explain your answer ? Answer : No, NULL value cannot be used in arithmetic operation. This is because a NULL just denotes an 'absence' of information rather than 'empty' or 'zero' value. Question 3 How you can delete a duplicate row from Unique key column? Answer : This necessity does not arise. First of all Unique key column will not allow duplicate rows to be inserted. Question 4 Tell any one advantage of using stored procedures in applications? Answer : Stored Procedures abstract complex SQL queries from application code. For example, a task involving multiple lines of complex SQL queries can be simpli...

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 Let x - 4 = p Then the given eqn becomes (p + 3) (p + 1) (p - 1) (p - 3) = 9 (p 2 - 1) (p 2 - 9) = 9 p 4 - 10p 2 + 9 = 9 p 2 (p 2 - 10) = 0 p 2 =0 or p 2 -10 =0 p = 0 or p = sqrt(10) or p = - sqrt(10) then x - 4 = 0, x - 4 = sqrt(10) or x - 4 = - sqrt(10) Now the roots of the given eqn are 4,4 + sqrt(10) and 4 - sqrt(10) The irrational roots are 4+sqrt(10) and 4 - sqrt(10) The sum of the irrational roots = 4 + sqrt(10) + 4 - sqrt(10) = 8. Hence the answer is 8. Question 2 The product of the distinct roots of the equation (3x)(3x+2)(3x-4)(3x-6)= 64 is: a)-32/27 b)-61/5 c)63/16 d)69/12 Answer : a)-32/27 Solution: Given that (3x)(3x+2)(3x-4)(3x-6)= 64 Let 3x - 2 = p Then the given eqn becomes (p + 2) (p + 4) (p - 2) (p - 4) = 64 (p 2 - 4) (p 2 - 16...