DSSSB Lab Technician Mathematics Paper 2014

DSSSB Laboratory Technician Arithmetical & Numerical Ability Paper 2014

A can do a job in 6 hours, B can do the same job in 8 hours. Then the number of hours A and B take if they complete the work together, is equal to
(a) 4 hours
(b) 24/7 hours
(c) 24/5 hours
(d) None of these

The present ages of two brothers is in the ratio 3 : 4. If 4 years ago their ages were in the ratio 2 : 3, their present ages are
(a) 30 and 40
(b) 15 and 20
(c) 12 and 16
(d) None of these

If 6x+3y=6xy, 2x+4y=5xy then (x,y)=?
(a) (1,2)
(b) (2,1)
(c) (1,1/2)
(d) (1/2, 1)

Sin2A=2SinA is true when A=?
(a) zero degree
(b) 30 degree
(c) 45 degree
(d) 60 degree

After revaluation a student’s marks was changed from 80 to 92, the percentage increase in marks is
(a) 12%
(b) 13%
(c) 15%
(d) 18%

If angles of a triangle are in A.P with the greatest being 84 degree, the other anges in the triange are
(a) 30 & 66 degree
(b) 36 & 60 degree
(c) 40 & 56 degree
(d) None of these

The average age of 10 students is 6 years. The sum of the ages of 9 of them is 52 years. The age of the 10th stduent is
(a) 10 years
(b) 9 years
(c) 7 years
(d) 8 years

The cost price of an article which is sold for Rs. 220 at a loss of 12%, is
(a) Rs. 280
(b) Rs. 250
(c) Rs. 200
(d) Rs. 225

The duration of time in which a sum of money triples itself at 8% p.a. simple interest is
(a) 12.5 years
(b) 13 years
(c) 12 years
(d) 25 years

The radii of two circles are 8 cm and 6 cm respectively. The radius of the circle having area equal to the sum of the areas of two circles is
(a) 14 cm
(b) 2 cm
(c) 12 cm
(d) 10 cm