Previous year ssc exam Math question : Number system

Number system is one the most important section of quantitative aptitude of ssc examination. Approximately 6 to 7 question every year asked from Number System.. stander of questions related to number system for combined higher secondary level is about to class 10 level but  stander of combined graduate level question related to   graduate level mathematics. Today we brought some of the selected previous year question with answer asked in previous year ssc exam. These questions are related to number system which is the part of ssc exam syllabus.
Q: ( 256*256*-144*144) /112=?
A 420         B 400        C 360        D 320
Answer; B

Q:  1 ½ + 11 ½ + 111 ½ + 1111 ½  = ?
A 1236     B 1234 ½     C 618         D 617
Answer : A

Q : (1/1*2 +1 / 2*3 +1 /3*4 + .......+ 1/99*100)=?
A 1/9900    B 99/100    C 100/99    D 1000/99
Answer : b

Q : (1 – 1/3 )(1-1/4)(1-1/5) …..(1-1/n)    = ?
A 1/n    B 2/n    C 2(n-1) / n   D 2 / n (n+1)
Answer : B

Q for natural no N , (1//1.2+1/2.3+1/.34+….+1/n(n+1))
A always 1    B grater then 1    C less then 1    D uncertain
Answer : C

Q : how many prime no are include between 110 to 120
A 0    B    1    C 2     D 3   
Ans: B

Q find out the minimum no for 803642, after adding it no will be divisible from 11
A 1    B 4        C 7    D 9
Answer : C

Q : find out minimum value  of Y in  6735Y1 for substituting in given no will divisible totally by 9
A 7    B 9            C 5        D 4
Answer : C

Q : if p and q denotes digit , the find out the maximum value of q in equation 5p9 +327 + 2q8 = 1114
A 9    B 8     C 7    D 6
Answer : D

Q in which of the following no is not divisible by 18?
A 34056     B 54036    C 50436    D 65043
Answer: D

Q: after multiply X to 7 every digit will be 3 after the answer then find out the least value of X ?
A 47649     B 47719    C 47619    D 48619
Answer: C