PROBLEM SOLVING ASSESSMENT (PSA) CBSE SAMPLE QUESTIONS
(1) What is the product of all the numbers in the dial of a telephone?
(a) 158480 (b) 159450 (c) 159480 (d) none of these
(2) The total number of digits used in numbering the pages of a book having 366 pages is
(a) 732 (b) 990 (c) 1098 (d) 1305
(3) Earlier when I had created my e-mail the password consisted of first four prime numbers. Recently when i tried to check my e-mails, I got dumbfounded since I could not remember my password exactly. So when I entered 2735, my computer indicated that no digit is correctly placed. Again I tried 5273, I got the same response. Again I entered only 3 the left most digit of my password, my computer indicated that it was wrong. Finally I was left with one more attempt to open my account. The code of my password is:
(a) 2537 (b) 7325 (c) 7352 (d) can’t be determined exactly
(4) What is the smallest number of ducks that could swim in this formation- two ducks infront of a duck, two ducks behind a duck and a duck between two ducks?
(a) 3 (b) 4 (c) 5 (d) more than 5
(5) Mohan gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross?
(a) 19 (b) 28
(c) 30 (d) 37
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