1.
The ascending order of 3,-2,5
Correct Answer
C. -2,3,5
Explanation
The given answer, -2,3,5, represents the ascending order of the numbers 3, -2, and 5. In ascending order, the numbers are arranged from smallest to largest. In this case, -2 is the smallest number, followed by 3, and then 5, which is the largest number. Therefore, -2,3,5 is the correct answer.
2.
The descending order of -5,-1,-3
Correct Answer
D. -1,-3,-5
Explanation
The correct answer is -1, -3, -5. This is the descending order of the given numbers -5, -1, -3. The numbers are arranged from highest to lowest, with -1 being the highest, followed by -3, and then -5.
3.
The number which is left of -5
Correct Answer
C. -7
Explanation
The number left of -5 is the number that comes before -5 in a sequence. In this case, if we arrange the numbers in ascending order, we have -7, -5, -3, 0, 1. Therefore, the number left of -5 is -7.
4.
The number which is neither positive nor negative
Correct Answer
A. 0
Explanation
The number 0 is the only number in the given options that is neither positive nor negative. It is considered neither positive nor negative because it is the neutral element in the number line. Any number greater than 0 is positive, and any number less than 0 is negative. However, 0 itself does not have a positive or negative value. Therefore, 0 is the correct answer for the number which is neither positive nor negative.
5.
The number which lies between -2 and 0
Correct Answer
B. -1
Explanation
The number -1 lies between -2 and 0 on the number line. It is the only option given that satisfies this condition.
6.
The LCM of 12 and 15
Correct Answer
D. 60
Explanation
The LCM (Least Common Multiple) is the smallest multiple that both numbers have in common. To find the LCM of 12 and 15, we can list the multiples of each number and find the smallest common multiple. The multiples of 12 are 12, 24, 36, 48, 60, ... and the multiples of 15 are 15, 30, 45, 60, ... The smallest common multiple is 60, which is the LCM of 12 and 15.
7.
The HCF of 7 and 10
Correct Answer
C. 1
Explanation
The HCF (Highest Common Factor) is the largest number that divides two or more numbers without leaving a remainder. In this case, the numbers are 7 and 10. When we list the factors of both numbers, we find that the only common factor is 1. Therefore, the HCF of 7 and 10 is 1.
8.
The greatest prime number between 1and 20
Correct Answer
D. 19
Explanation
The question asks for the greatest prime number between 1 and 20. Prime numbers are numbers that are only divisible by 1 and themselves. Among the given options, 19 is the only prime number as it is not divisible by any other number except 1 and itself. Therefore, 19 is the correct answer.