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UPSC Exam  >  UPSC Tests  >  UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making  >  Finding Unit Digit - MCQ Test - UPSC MCQ

Finding Unit Digit - MCQ Test - UPSC MCQ


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5 Questions MCQ Test UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making - Finding Unit Digit - MCQ Test

Finding Unit Digit - MCQ Test for UPSC 2024 is part of UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making preparation. The Finding Unit Digit - MCQ Test questions and answers have been prepared according to the UPSC exam syllabus.The Finding Unit Digit - MCQ Test MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Finding Unit Digit - MCQ Test below.
Solutions of Finding Unit Digit - MCQ Test questions in English are available as part of our UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making for UPSC & Finding Unit Digit - MCQ Test solutions in Hindi for UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Finding Unit Digit - MCQ Test | 5 questions in 10 minutes | Mock test for UPSC preparation | Free important questions MCQ to study UPSC Prelims Paper 2 CSAT - Quant, Verbal & Decision Making for UPSC Exam | Download free PDF with solutions
Finding Unit Digit - MCQ Test - Question 1
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Find the unit digit of (7493263)x(15129)

Detailed Solution for Finding Unit Digit - MCQ Test - Question 1

Answer: c)7

Solution:
The given product is (7493263)x(15129)
Required unit digit = the unit digit of(3263)x(129) ...(1)
In the value of 3 to the power 4, we have the unit digit as 1.
so, we can rewrite (3263) = [3(4x65 + 3)] = [(34)65] x (33)
Then from eqn(1),
The unit digit of(3263)x(129) = The unit digit of[(34)65] x (33) x 129
= The unit digit of[165] x 27 x 1
= The unit digit of 1 x 7 x 1 = 7
Hence, the answer is 7.

Finding Unit Digit - MCQ Test - Question 2
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Find the unit digit of 634262 + 634263

Detailed Solution for Finding Unit Digit - MCQ Test - Question 2

Given that 634262 + 634263
= 634262(1 + 634)
= (634262) x 635
The unit digit of (634262) x 635 = the unit digit of (4262 x 5)
We know that, the unit digit of 4 to the power of any odd number is 4 and the unit digit of 4 to the power of any even number is 6.
Then the unit digit of (4262 x 5) = unit digit of(6 x 5) = 0

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Finding Unit Digit - MCQ Test - Question 3
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The digit in the unit place of the number represented by (795 * 358) is

Finding Unit Digit - MCQ Test - Question 4
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What is the units digit of  5745?
Detailed Solution for Finding Unit Digit - MCQ Test - Question 4


Finding Unit Digit - MCQ Test - Question 5
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What is the units digit of  3961?
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