Question

PLEASE ANSWER ALL THESE QUESTION WITH EXPLANATIONS
7. The cube of a negative even number is
A. Negative even number C. Positive even number
B. Positive Odd number D Negative Odd number
8. Additive inverse of the additive inverse of the reciprocal of a rational number is
A. The number itself
B. The rational number with numerator and denominator interchanged.
C. The rational number with change in sign
D. The negative of reciprocal.
9. How many non-perfect square numbers are there between 40 and 70.
A. 27 C. 28
B. 29 D. 30
10. +

is a rational number
A. Between x and y C. Greater than x and y both
B. Less than x and y both D. Less than x but greater than y
11. Which number is a perfect cube?
A. 0.8 C. 0.008
B. 0.08 D. 0.0008
12. Which of the following is not true?
A. rational numbers are closed under addition
B. rational numbers are closed under subtraction
C. rational numbers are closed under multiplication
D. rational numbers are closed under division
13. A number which ends with 6 will have the unit digit of its square root as
A. 4 C. 4 or 6
B. 6 D. None of the above
14. If 6x = 18, then 18x = 54.
A. True
B. False
15. 1000000 m2 = _____ Km2
A. 10 C. 1
B. 100 D. 1000
16. Which of the following numbers is not a perfect square ?
A. 62500 C. 90000
B. 57600 D. 63147
17. The one’s digit of cube of 23 is
A. 9 C. 6
B. 7 D. 2
18. If the height of a trapezium gets doubled with the length of parallel sides being the same
,then the area becomes ____________ the original area.
A. Half C. Same
B. 4 times D. 2 times
19. If m is the cube of n, then n is the
A. Cube root of m C. Square of m
B. Cube of m D. Square root of m
20. If x + 0 = 0 + x = x, which is rational number, then 0 is called
A. identity for addition of rational numbers
B. additive inverse of x
C. multiplicative inverse of x
D. reciprocal of x
21. Which of the following properties describe a trapezium?
A. A pair of opposite sides is parallel
B. The diagonals bisect each other
C. The diagonals are perpendicular to each other
D. The diagonals are equal

Answer 1

Answer:

$\huge\underbrace\mathfrak\pink{answer:-}$

7)d

8)b

9)a

10)b

11)a

12)c

13)d

14)b

15)a

16)c

17)d

18)d

19)a

20)b

21)a