Anna University Campus Placement Aptitude & Decimal Fraction Questions and Answers

Some Basic Formulae:

1. (a + b)(a - b) = (a² - b²)
2. (a + b)² = (a² + b² + 2ab)
3. (a - b)² = (a² + b² - 2ab)
4. (a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
5. (a³ + b³) = (a + b)(a² - ab + b²)
6. (a³ - b³) = (a - b)(a² + ab + b²)
7. (a³ + b³ + c³ - 3abc) = (a + b + c)(a² + b² + c² - ab - bc - ac)
8. When a + b + c = 0, then a³ + b³ + c³ = 3abc.

1) What decimal of an hour is a second ?

A. .0025                        B. .0256

C. .00027                        D. .000126

Answer: Option C


2) If 2994 ÷ 14.5 = 172, then 29.94 ÷ 1.45 = ?

A. 0.172                        B. 1.72

C. 17.2                                D. 172

Answer: Option C


 
3) The expression (11.98 x 11.98 + 11.98 x x + 0.02 x 0.02) will be a perfect square for x equal to:

A. 0.02                                 B. 0.2

C. 0.04                                  D. 0.4

Answer: Option C



4) 3889 + 12.952 - ? = 3854.002

A. 47.095                        B. 47.752

C. 47.932                        D. 47.95

Answer: Option D



5) 0.04 x 0.0162 is equal to:

A. 6.48 x 10-3                   B. 6.48 x 10-4

C. 6.48 x 10-5                   D. 6.48 x 10-6

Answer: Option B

6) The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y ?

A. 2010                          B. 2011

C. 2012                        D. 2013

Answer: Option B



7) 617 + 6.017 + 0.617 + 6.0017 = ?

A. 6.2963                        B. 62.965

C. 629.6357                        D. None of these

Answer: Option C

8) 0.002 x 0.5 = ?

A. 0.0001                        B. 0.001

C. 0.01                                D. 0.1

Answer: Option B

9) 34.95 + 240.016 + 23.98 = ?

A. 298.0946                        B. 298.111

C. 298.946                        D. 299.09

Answer: Option C

10) Which of the following is equal to 3.14 x 106 ?

A. 314                                        B. 3140

C. 3140000                        D. None of these

Answer: Option C


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