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CBSE Questions for Class 11 Commerce Applied Mathematics Numerical Applications Quiz 12 - MCQExams.com

If four men working at the same rate can do 2/3 of a job in 40 minutes it take one man working at this rate to do 2/5 of the job takes how many minutes?

  • 80
  • 88
  • 92
  • 96
  • 112
A library has a copies of one book, b copies of each of two books, c copies of each of three books, and single copy each of d. The total number of ways in which these books can be arranged in a row is
  • (a+b+c+d)!a!b!c!
  • (a+2b+3c+d)!a!(b!)2(c!)3
  • (a+2b+3c+d)!a!b!c!
  • none of these
The number of ways dividing 52 cards amongst four players equally, are
  • 52!(13!)4
  • 52!(13!)44!
  • 52!(12!)44!
  • None of these
If a pipe can fill a cistern in 8 hours and another pipe can empty the cistern in 10 hours, then what part of the cistern will be filled in 1 hour, if both pipes are opened simultancously? 
  • 140
  • 130
  • 135
  • 18
A pipe can fill a cistern in 12 min and another pipe can fill it in 15 min, but a third pipe can empty it in 6 min. The first two pipes are kept open for 5 min in the beginning and then the third pipe is also opened. Time taken to empty the cistern is
  • 30 min
  • 33 min
  • 3712min
  • 45 min
A street-light is hung 20 ft, above the ground. An object falls freely under the gravity, starting from rest at the same height as the lamp and at a horizontal distance of 5 ft. from it. When the object has fallen through 16 ft, the speed of the shadow of the object on the ground is 
  • 12 ft./sec
  • 11 ft./sec
  • 10 ft./sec
  • 12.5 ft./sec
Four of the six numbers 1867, 1993, 2019, 2025, 2109 and 2121 have a mean ofWhat is the mean of the other two numbers. 
  • 1994
  • 2006
  • 2022
  • 2051
Two pipes fill a tank in 20 minutes and 60 minutes. A third pipe empties the same tank in 40 minutes. In how much time will the tank be filled if all three pipes are opened together?
  • 6 min
  • 24 min
  • 30 min
  • 40 min
If a pipe fills a tank in 20 minutes and a pipe empties the same tank in 60 minutes. Then in how much time the tank will be filled completely if both the pipes are opened together?
  • 10 minutes
  • 70 minutes
  • 40 minutes
  • 30 minutes
The mean of series x1,x2,x3,........xn isˉx, then mean of the series x1,+2i,i=1,2,3,....................n will be 
  • ˉx+n
  • ˉx+n+1
  • ˉx+2
  • ˉx+2n
If 16 men can build a wall of 52m long in 25 days working for 8 hours a day, in how many days can 64 men build a similar wall of 260m long working for 10 hours a day?
  • 35
  • 65
  • 40
  • 25
A and  B  can do a job together in  7 days  A  is  134  times as efficient as  B The same job can be done by  A  alone in
  • 913days
  • 11days
  • 1214days
  • 1612days
In a conference hall 10  executive are to be seated on 10 chairs placed left to right. Executive E1 wants to sit to the right of E2 Also, E4 wants to sit the left of E1 and E5 wants to sits to the left of ways E4 Number of ways the executives can be seated on the 10 chairs, is 
  • 10!4!
  • 10!3
  • 10!
  • 3×10!4!
Number of positive integers  n,  less than  17,  for which  n!+(n+1)!+(n+2)!  is an integral multiple of  49  is
  • 2
  • 5
  • 7
  • 9
4 men and 3 women finish a job in 6 days. And 5 men and 7 women can do the same job in 4 days. How long will 1 man and 1 woman take to do the work?
  • 2227days
  • 2512days
  • 517days
  • 12722days
If  m  and  n  are positive integers more than or equal to  2,m>n,  then  (mn)!  is divisible by
  • (m!)n
  • (n!)m
  • (m+n)!
  • (mn)!
0:0:2


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