Questions of Elementary Mathematics Asked in UPSC CDS(I) 2018

Q1. 5¹⁷+5¹⁸+5¹⁹+5²⁰ is divisible by
a. 7
b. 9
c.11
d.13

Q2. If a+b=2c, then what is the value of a/(a-c) + c/(b-c) ?
a. -1
b. 0
c.1
d.2

Q3. The Smallest Integer with 4 digits which is a perfect square is:
a. 1000
b. 1024
c.1089
d.None of the Above

Q4. Which one of the following is the zero of the polynomial 3x³+4x²-7 ?
a. 0
b. 1
c.2
d.-1

Q5. A train moving with a speed of 60kmph crosses an electric pole in 30 seconds, what is the length of the train in meters?
a. 300
b. 400
c.500
d.600

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