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Number System MCQs for Class 9 Exam
It covers all Important Questions with answers on Number System for the Class 9 exam. The questions are based on important topics. Details about the questions:- Topic: Number System
- Type of Questions: MCQs with solutions
- Number of Questions: 50
- You can attempt them on EduRev to score high in Class 9 exam.
Which of the following (100 - 990) x 100?- a)10000
- b)100
- c)9900
- d)99000
Correct answer is option 'C'. Can you explain this answer?
Which of the following (100 - 990) x 100?
a)
10000
b)
100
c)
9900
d)
99000
 | Preksha Kapoor answered |
Calculation:
(100 - 990) x 100
= (-890) x 100
= -89000
= -9900 x (-1)
= 9900
Explanation:
To solve the given expression, we need to follow the order of operations, which is also known as BODMAS or PEMDAS. In this case, we have only multiplication and subtraction, so we can perform them from left to right.
(100 - 990) x 100
= (-890) x 100 [Subtract 990 from 100, which gives -890]
= -89000 [Multiply -890 by 100]
= -9900 x (-1) [Express -89000 as a product of -9900 and -1]
= 9900 [Since a negative number multiplied by a negative number gives a positive number, the answer is positive]
Therefore, the correct answer is option 'C' (9900).
(100 - 990) x 100
= (-890) x 100
= -89000
= -9900 x (-1)
= 9900
Explanation:
To solve the given expression, we need to follow the order of operations, which is also known as BODMAS or PEMDAS. In this case, we have only multiplication and subtraction, so we can perform them from left to right.
(100 - 990) x 100
= (-890) x 100 [Subtract 990 from 100, which gives -890]
= -89000 [Multiply -890 by 100]
= -9900 x (-1) [Express -89000 as a product of -9900 and -1]
= 9900 [Since a negative number multiplied by a negative number gives a positive number, the answer is positive]
Therefore, the correct answer is option 'C' (9900).
Which among these is the approximate value of π?- a)14/3
- b)22/7
- c)7/22
- d)3/14
Correct answer is option 'D'. Can you explain this answer?
Which among these is the approximate value of π?
a)
14/3
b)
22/7
c)
7/22
d)
3/14
 | Aniket Yadav answered |
The number π is a mathematical constant. Originally defined as the ratio of a circle's circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spelled out as "pi". It is also called Archimedes' constant.
Which of the following is an rational number?- a)0.323223222322223…….
- b)√180
- c)√31
- d)√196
Correct answer is option 'D'. Can you explain this answer?
Which of the following is an rational number?
a)
0.323223222322223…….
b)
√180
c)
√31
d)
√196
 | Zachary Foster answered |
- A rational number is a number that can be expressed as a fraction where both the numerator and denominator are integers.
- √196 is a rational number because it simplifies to 14/1, which is a fraction where both the numerator and denominator are integers.
- Options B and C are irrational numbers because they cannot be expressed as fractions.
- Option A is a repeating decimal, which can be rational if it eventually settles into a repeating pattern, but without further information, it is not clear if this is the case.
- √196 is a rational number because it simplifies to 14/1, which is a fraction where both the numerator and denominator are integers.
- Options B and C are irrational numbers because they cannot be expressed as fractions.
- Option A is a repeating decimal, which can be rational if it eventually settles into a repeating pattern, but without further information, it is not clear if this is the case.
Between 3 and 4 there are- a)10,000 rational numbers
- b)1000 rational numbers
- c)Infinitely many rational numbers
- d)500 rational numbers
Correct answer is option 'C'. Can you explain this answer?
Between 3 and 4 there are
a)
10,000 rational numbers
b)
1000 rational numbers
c)
Infinitely many rational numbers
d)
500 rational numbers
 | Anita Menon answered |
There is no single number between 3 and 4, there is an infinite amount of numbers. If you are asking for INTEGERS, there are none. If not, you can have unlimited numbers between 3 and 4. For example, a number could be 3.0000000000000000005 or 3.9999999999999997.
How many rational numbers can you find between 5 and 6?- a)infinite
- b)6
- c)1
- d)5
Correct answer is option 'A'. Can you explain this answer?
How many rational numbers can you find between 5 and 6?
a)
infinite
b)
6
c)
1
d)
5
 | Jyoti Kapoor answered |
There are infinitely many rational numbers between any two real numbers. For example ( 5 + 6 ) / 2 = 11 / 2 , the average of 5 and 6, is between them.
How many zeros after the decimal point will be there in the decimal form of the number 10 -n ?- a)n
- b)n+1
- c)n-1
- d)n/2
Correct answer is option 'C'. Can you explain this answer?
How many zeros after the decimal point will be there in the decimal form of the number 10 -n ?
a)
n
b)
n+1
c)
n-1
d)
n/2
 | Rishi Agrawal answered |
Because one will be before the decimal point
Which of the following is a rational number?- a)2√3
- b)0
- c)π
- d)1+√3
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a rational number?
a)
2√3
b)
0
c)
π
d)
1+√3
 | Abhay Yadav answered |
Rational Number
A rational number is a number that can be expressed in the form of p/q where p and q are integers and q is not equal to zero.
Given Options
a) 23 - This is an integer and can be written as 23/1. It is a rational number.
b) 0 - This can be written as 0/1. It is a rational number.
c) √2 - This is an irrational number as it cannot be expressed in the form of p/q where p and q are integers.
d) 1 3 - This is a mixed fraction and can be written as 4/3. It is a rational number.
Conclusion
Hence, the only rational number among the given options is 0.
A rational number is a number that can be expressed in the form of p/q where p and q are integers and q is not equal to zero.
Given Options
a) 23 - This is an integer and can be written as 23/1. It is a rational number.
b) 0 - This can be written as 0/1. It is a rational number.
c) √2 - This is an irrational number as it cannot be expressed in the form of p/q where p and q are integers.
d) 1 3 - This is a mixed fraction and can be written as 4/3. It is a rational number.
Conclusion
Hence, the only rational number among the given options is 0.
is :-
is equal to :-- a)2n+1
- b)-2n+1 + (1/8)
- c)(9/8 - 2n)
- d)1
Correct answer is option 'D'. Can you explain this answer?
is equal to :-a)
2n+1
b)
-2n+1 + (1/8)
c)
(9/8 - 2n)
d)
1
 | EduRev Class 9 answered |
2n(24-2) + 2-3
2nx2x23
14 + 2-3
24
7/8+1/8
1
2nx2x23
14 + 2-3
24
7/8+1/8
1
is equal to ——
- a)128
- b)32
- c)26
- d)64
Correct answer is option 'D'. Can you explain this answer?
a)
128
b)
32
c)
26
d)
64
 | Tanya Pathak answered |
(4)4^3/4
(4)^3/4×4
(4)^3
4×4×4
64
(4)^3/4×4
(4)^3
4×4×4
64
is :-
is
Can you explain the answer of this question below:A number is irrational if and only if its decimal representation is:- A:Terminating
- B:non- terminating and repeating
- C:non- terminating
- D:non- terminating and non-repeating
The answer is d.
A number is irrational if and only if its decimal representation is:
A:
Terminating
B:
non- terminating and repeating
C:
non- terminating
D:
non- terminating and non-repeating
 | Prachi Singh answered |
The number is irrational if it's decimal representation is non terminating and non repeating.
in the form of fraction is- a)2/13
- b)3/11
- c)3/13
- d)2/11
Correct answer is option 'C'. Can you explain this answer?
in the form of fraction isa)
2/13
b)
3/11
c)
3/13
d)
2/11
 | Krishna Shukla answered |
X=0.230769 (1) 1000000=230769.230769
(2) subtracting
(1) from (2) 230769 =9999999x then, x =230769/9999999 =3/13
is - a)a terminating decimal.
- b)a non terminating recurring decimal
- c)a non terminating non recurring decimal
- d)an integer
Correct answer is option 'B'. Can you explain this answer?
is a)
a terminating decimal.
b)
a non terminating recurring decimal
c)
a non terminating non recurring decimal
d)
an integer
 | Uttam Shukla answered |
Because we know that those decimals are known as non terminating recurring in which a digit or a set of digits repeats hoti infinitive times so here same things happen 17÷3=5.666666666.....
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