CTET Maths MCQ - Number System & Arithmetic

1 For three integers a, b and c, the law (a x b) x c = a x (b x c)is called

A
multiplicative law
B
commutative law
C
distributive law
D
associative law

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Correct AnswerOption D

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(a x b) x c = a x (b x c) is called associative law

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2 In Roman system, 98 is written as

A
CXVIII
B
XLVIII
C
XCVIII
D
LXVIII

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Correct AnswerOption C

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In Roman system, 98 will be written as XCVIII

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3 Which of the following is Hardy Ramanujan number?

A
1592
B
1357
C
1729
D
1234

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Correct AnswerOption C

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1729 is "Hardy" Ramanujan number, because it is the smallest number expressible as the sum of two cubes in two different ways, i.e. 1729 =1³ + 12³ = 9³ + 10³

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4 An amount becomes Rs.2400 in 3 yr and Rs.2520 in 4 yr. The rate of annual compound interest is 10%

A
10%
B
3%
C
8%
D
5%

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Correct AnswerOption D

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5 The value of 1.3 is equal to

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Correct AnswerOption A

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The value of 1.3 is

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