Pipes & Cisterns Mcqs

Q.  Two pipes A and B can fill a cistern in 12 and 15 minutes respectively. Both are opened together but after 3 minutes A is turned off. After how much more time will the cistern be filled?

a. 3 1/4 min
b. 5 1/4 min
c. 8 1/4 min
d. 9 1/4 min


ANSWER: See Answer
 
3/12 + (3 + x)/15 = 1

x = 8 1/4
MCQs:  Using all the letters of the word “THURSDAY”, how many different words can be formed?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  How many three letter words are formed using the letters of the word TIME?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boy has nine trousers and 12 shirts. In how many different ways can he select a trouser and a shirt?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  There are 30 people in a group. If all shake hands with one another , how many handshakes are possible?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In how many different ways can the letters of the word ‘OPTICAL’ be arranged so that the vowels always come together?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged so that the vowels always come together?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  How many 4-letter words with or without meaning, can be formed out of the letters of the word, ‘LOGARITHMS’, if repetition of letters is not allowed?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  There are two identical red, two identical black, and two identical white balls.In how many different ways can the balls be placed in the cells (Each cell to contain one ball) shown above such that balls of the same colour do not occupy any two consecutive cells?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Twelve people from a club, by picking lots. One of them will host a dinner for all once in a month. The number of dinners a particular member has to host in one year is________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A person ordered 5 pairs of black socks and some pairs of brown socks. The price of a black pair was thrice that of a brown pair while preparing the bill the bill clerk inter-changed the number of black and brown pairs by mistake which increased the bill by 100% what was the number of pair of brown socks in the original order?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A two number committee comprising of one male and the female number is to be constituted out of five male and 3 females. Amongst the females, Ms. A refused to be number committee in which Mr.B is taken as the number of how many different ways can the committee be constituted?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A selection is to be made for one post of principal and two posts of vice-principal amongst the six candidates called for the interview only two are eligible for the post of principal while they all are eligible for the post of vice-principal. The number of possible combinations of selectees is___________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A student has to opt for 2 subjects out of 5 subjects for a course. Namely commerce, economics, statistics, mathematics 1 and Mathematics 2, Mathematics 2 can be offered only if mathematics 1 has also opted. The number of different combinations of two subjects which can be opted is_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  2 men and 1 woman board a bus of which 5 seats are vacant, one of these 5 seats is reserved for ladies. A woman may or may not sit on the seat reserved for ladies, In how many different ways can the five seats be occupied by these passengers?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving I. Single flag of different colours II. Any two flags in a different sequence of colours. III. three flags in a different sequence of colours. The maximum number of codes that can be generated is.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Three dice (each having six faces with each face having one number from 1 or 6) are ralled. What is the number of possible outcomes such that atleast one dice shows the number 2?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A mixed doubles tennis game is to be played two teams(each consists of one male and one female) There are four married couples. No team is to consist a husband and his wife. What is the maximum number of games that can be played?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In a question paper, there are four multiple choice type questions, each question has five choices with only one choice for it’s correct answer. What is the total number of ways in which a candidate will not get all the four answers correct?
Category: Mathematics Quizzes,   Published by: T-Code Scripts