number systems Model Questions & Answers, Practice Test for ssc mts paper 1
A light was seen regularly at an interval of 13 seconds. It was seen for the first time at 1 hour 54 minutes 50 seconds (a.m.) and the last time at 3 hours 17 minutes 49 seconds (a.m.). How many times was the light seen?
Answer: (d)
$1^{st}$ time seen
= 1 hour 54 min 50 sec
= 3600 sec + 54 × 60 sec + 50 sec
= 6890 sec
$2^{nd}$ time seen
= 3 hour + 17 min + 49 sec
= 11869 sec.
Interval between light seen
= 11869 – 6890 = 4979
Number of times light was seen
= $4979/13$ + 1 = 384
If x + y + z = 0 then $x^3 + y^3 + z^3 + 3xyz$ is equal to
Answer: (a)
Given x + y + z = 0
$x^3 + y^3 + z^3 + 3xyz – 3xyz + 3xyz$
= $x^3 + y^3 + z^3 –3xyz + 6xyz$
= $(x + y + z) (x^2 + y^2 + z^2 – xy – yz –zx) + 6xyz$
= $(0) (x^2 + y^2 + z^2 – xy – yz – zx) + 6xyz$
= 6xyz
In a cricket match, Team A scored 232 runs without losing a wicket. The score consisted to byes, wides and runs scored by two opening batsmen : Ram and Shyam. The runs scored by the two batsman are 26 times wides. There are 8 more byes than wides. If the ratio of the runs scored by Ram and Shyam is 6 : 7, then the runs scored by Ram is
Answer: (b)
Let there be w wide runs.
Byes = w + 8
Runs scored by batsmen = 26 w
Total run = 232
or w + w + 8 + 26W = 323
⇒ w = $224/28 = 8$
∴ Run scored by Ram = $6/13 × 208 = 96$
$a + 1/{b + {1/{c + 1/{d + …}}}}$ If a, b, c, d etc. are positive integers, then what is the value of ‘b’?
Answer: (a)
The expression can be written as a + $1/{b + x}$,
where x lies in the interval (0, 1).
Since $(1.25)^3 = 1.953125$ and $(1.3)^3 = 2.197$, it can be concluded that $2^{1/3}$ belongs to the interval (1.25, 1.3).
Hence, a = 1.
This implies that $1/{b + x}$ lies in the interval (0.25, 0.3).
The only possible value of b = 3.
The sum of the place values of 3 in the numbers 50, 35 and 35 is
Answer: (a)
Given, numbers are 50, 35 and 35.
Now, place value of 3 is 30 and 30 in the numbers 35 and 35 respectively.
∴ Sum of the place values = 30 + 30 = 60
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