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All questions of Exponents and Roots for Grade 9 Exam
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.
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.
The value of 25 is _________ .- a) 3
- b) 10
- c) 32
- d) 7
Correct answer is option 'C'. Can you explain this answer?
The value of 25 is _________ .
a)
3
b)
10
c)
32
d)
7
|
Simran Choudhary answered |
Value of 25
The value of 25 is:
- Option C) 32
Explanation:
- The question asks for the value of 25, which means we need to choose one of the given options that represents the actual value of 25.
- Option A) 3 is not the value of 25, as 25 is a two-digit number and 3 is a single-digit number.
- Option B) 10 is not the value of 25, as 10 is a number that comes after 9, and 25 is a number that comes after 24.
- Option D) 7 is not the value of 25, as 7 is a single-digit number and 25 is a two-digit number.
- Therefore, the correct option is C) 32, as 32 is the actual value of 25 when expressed in base 8 or octal system. In octal system, 25 is represented as 31, and when converted to decimal system, it becomes 3x8+1= 24+1= 25.
Conclusion:
- The value of 25 is 32 when expressed in octal system, which is represented by option C).
The value of 25 is:
- Option C) 32
Explanation:
- The question asks for the value of 25, which means we need to choose one of the given options that represents the actual value of 25.
- Option A) 3 is not the value of 25, as 25 is a two-digit number and 3 is a single-digit number.
- Option B) 10 is not the value of 25, as 10 is a number that comes after 9, and 25 is a number that comes after 24.
- Option D) 7 is not the value of 25, as 7 is a single-digit number and 25 is a two-digit number.
- Therefore, the correct option is C) 32, as 32 is the actual value of 25 when expressed in base 8 or octal system. In octal system, 25 is represented as 31, and when converted to decimal system, it becomes 3x8+1= 24+1= 25.
Conclusion:
- The value of 25 is 32 when expressed in octal system, which is represented by option C).
Multiplicative inverse of 7-2 is _________ - a)49
- b)5
- c)7
- d)-14
Correct answer is option 'A'. Can you explain this answer?
Multiplicative inverse of 7-2 is _________
a)
49
b)
5
c)
7
d)
-14
|
Anu Kumar answered |
To find the multiplicative inverse of 7-2, we need to find a number that when multiplied by 7-2 gives us 1 as the product.
Let x be the multiplicative inverse of 7-2, then we have:
(7-2) * x = 1
Expanding the left-hand side, we get:
7x - 2x = 1
Simplifying, we get:
5x = 1
Dividing both sides by 5, we get:
x = 1/5
Therefore, the multiplicative inverse of 7-2 is 1/5, which is equivalent to 0.2 or 20%.
Option A, 49, is not the correct answer.
Let x be the multiplicative inverse of 7-2, then we have:
(7-2) * x = 1
Expanding the left-hand side, we get:
7x - 2x = 1
Simplifying, we get:
5x = 1
Dividing both sides by 5, we get:
x = 1/5
Therefore, the multiplicative inverse of 7-2 is 1/5, which is equivalent to 0.2 or 20%.
Option A, 49, is not the correct answer.
A group of students were given an assignment to collect different types of leaves. The group collected 32 types of leaves. Represent the number of leaves collected in the form of exponential expression with its base being indivisible.
- a)25
- b)23
- c)24
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
A group of students were given an assignment to collect different types of leaves. The group collected 32 types of leaves. Represent the number of leaves collected in the form of exponential expression with its base being indivisible.
a)
25
b)
23
c)
24
d)
None of the above
|
Rohit Sharma answered |
32 = 2 x 2 x 2 x 2 x 2 = 25
Therfore, the correct answer is A.
Simplify and write in exponential form: (−2)−3 × (−2)− 4
- a)(2)7
- b)(−2)−7
- c)(2)−7
- d)(−2)7
Correct answer is option 'B'. Can you explain this answer?
Simplify and write in exponential form: (−2)−3 × (−2)− 4
a)
(2)7
b)
(−2)−7
c)
(2)−7
d)
(−2)7
|
Kavya Saxena answered |
(-2)-3*(-2)-4 = (-2)(-3)+(-4) = (-2)(-7)
Fill in the blank am × an = a ........ where m and n are natural numbers:-- a)mn
- b)m + n
- c)m - n
- d)m/n
Correct answer is option 'B'. Can you explain this answer?
Fill in the blank am × an = a ........ where m and n are natural numbers:-
a)
mn
b)
m + n
c)
m - n
d)
m/n
|
|
Jay Saini answered |
I am a computer program designed to assist with various tasks and provide information to users.
In simplified form (3-1 + 4-1 + 5-1)0 is equals to
- a)12
- b)-3
- c)12-1
- d)1
Correct answer is option 'D'. Can you explain this answer?
In simplified form (3-1 + 4-1 + 5-1)0 is equals to
a)
12
b)
-3
c)
12-1
d)
1
|
EduRev Class 8 answered |
(3-1 + 4-1 + 5-1)0
( )0 (any no)0=1
( )0 (any no)0=1
Find the value of x, if 32 =2x.- a)5
- b)2
- c)3
- d)4
Correct answer is option 'A'. Can you explain this answer?
Find the value of x, if 32 =2x.
a)
5
b)
2
c)
3
d)
4
|
Pranab Kumar answered |
Factorisation of 32 is 2 x 2 x 2 x 2 x 2
32 = 25
X = 5
32 = 25
X = 5
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.
The approximate distance of moon from the earth is 384,467,000 m and in exponential form. This distance can be written as - a)3.84,467 × 108m
- b)384,467 × 10-8 m
- c)384,467 × 10-9 m
- d)3.844,67 × 10-13 m
Correct answer is option 'A'. Can you explain this answer?
The approximate distance of moon from the earth is 384,467,000 m and in exponential form. This distance can be written as
a)
3.84,467 × 108m
b)
384,467 × 10-8 m
c)
384,467 × 10-9 m
d)
3.844,67 × 10-13 m
|
C K Academy answered |
Given , The distance between the moon
and the earth is 384467000 m
384467000
= 384467000 × ( 108/108 )
= ( 384467000/108 ) × 108
= 3.84467 × 108 m
and the earth is 384467000 m
384467000
= 384467000 × ( 108/108 )
= ( 384467000/108 ) × 108
= 3.84467 × 108 m
Write the expression using exponents: 61 × 61 × 61 × 61 × 61
- a)612
- b)613
- c)614
- d)615
Correct answer is option 'D'. Can you explain this answer?
Write the expression using exponents: 61 × 61 × 61 × 61 × 61
a)
612
b)
613
c)
614
d)
615
|
Pooja Shah answered |
Answers is 61^5 because 61 is multiplied 5 times
The Base in the expression 1024 is __________.- a) 1
- b) 10
- c) 0
- d) 24
Correct answer is option 'D'. Can you explain this answer?
The Base in the expression 1024 is __________.
a)
1
b)
10
c)
0
d)
24
|
|
Prerna Nambiar answered |
Base in the expression 1024 is 24.
Explanation:
In the number system, the base is the number of digits or values used to represent a number. For example, in the decimal number system, the base is 10, as there are 10 digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used to represent any number.
In the given expression 1024, the number is written in the base 10 system. However, if we convert this number to the base 2 system (binary), we get:
1024 = 2^10
Therefore, the base in the expression 1024 is 2, as the number can be written as a power of 2 raised to the 10th power.
However, if we consider the number 1024 in the hexadecimal (base 16) system, we can write:
1024 = 4 x 16^2
Therefore, the base in the expression 1024 is 16, as the number can be written as a product of 4 and 16 raised to the 2nd power.
Similarly, if we consider the number 1024 in the octal (base 8) system, we can write:
1024 = 2^12
Therefore, the base in the expression 1024 is 8, as the number can be written as a power of 8 raised to the 12th power.
Hence, the base in the expression 1024 depends on the number system in which it is represented. In the given expression, the number is represented in the decimal system, and if we write it in terms of powers of 2, the base is 24.
Explanation:
In the number system, the base is the number of digits or values used to represent a number. For example, in the decimal number system, the base is 10, as there are 10 digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used to represent any number.
In the given expression 1024, the number is written in the base 10 system. However, if we convert this number to the base 2 system (binary), we get:
1024 = 2^10
Therefore, the base in the expression 1024 is 2, as the number can be written as a power of 2 raised to the 10th power.
However, if we consider the number 1024 in the hexadecimal (base 16) system, we can write:
1024 = 4 x 16^2
Therefore, the base in the expression 1024 is 16, as the number can be written as a product of 4 and 16 raised to the 2nd power.
Similarly, if we consider the number 1024 in the octal (base 8) system, we can write:
1024 = 2^12
Therefore, the base in the expression 1024 is 8, as the number can be written as a power of 8 raised to the 12th power.
Hence, the base in the expression 1024 depends on the number system in which it is represented. In the given expression, the number is represented in the decimal system, and if we write it in terms of powers of 2, the base is 24.
A rational number between 
and 
is- a)
- b)
- c)2.1
- d)3.1
Correct answer is option 'C'. Can you explain this answer?
A rational number between and is
and isa)
b)
c)
2.1
d)
3.1
|
|
Jyoti Kapoor answered |
Rational numbers are those which can be expressed in the p/q form where q isn't equal to 0 and p,q are integers
There exists infinite rational numbers between any two numbers
Few rational numbers between √3=1.7320... and √5=2.236.. are
2, 1.8, 1.81, 1.9, 2.1, 2.22
Identify the irrational number among these.
- a)√13
- b)9
- c)36
- d)25
Correct answer is option 'A'. Can you explain this answer?
Identify the irrational number among these.
a)
√13
b)
9
c)
36
d)
25
|
Aditi Deshpande answered |
A)3 (This is a rational number as it can be expressed as 3/1 or 6/2 or any other integer divided by 1)
जुंडी का अर्थ है
- a)मक्का
- b)गेहूँ की बाली
- c)धान की बाली
- d)ज्वार की बाली
Correct answer is option 'D'. Can you explain this answer?
जुंडी का अर्थ है
a)
मक्का
b)
गेहूँ की बाली
c)
धान की बाली
d)
ज्वार की बाली
|
|
Priyanka Sharma answered |
जुंडी का अर्थ है ज्वार की बाली।
जुंडी का तात्पर्य उन खाद्यान्नों से हे जो मोठे अनाजों के तौर पर प्रयुक्त होते हैं जैसे की बाजरा , ज्वार , रागी , मोठे अन्न.
जुंडी का तात्पर्य उन खाद्यान्नों से हे जो मोठे अनाजों के तौर पर प्रयुक्त होते हैं जैसे की बाजरा , ज्वार , रागी , मोठे अन्न.
Can you explain the answer of this question below:Which of the following statement is true?
- A:
Every real number is a rational number.
- B:
Every real number is irrational.
- C:
The real number line contains both rational as well as irrational numbers.
- D:
Half the numbers on the number line are rational and the remaining half irrational
The answer is c.
Which of the following statement is true?
Every real number is a rational number.
Every real number is irrational.
The real number line contains both rational as well as irrational numbers.
Half the numbers on the number line are rational and the remaining half irrational
|
Rooplata Singh answered |
C is correct
The product or quotient of a non-zero rational number with an irrational number is:- a)Rational number
- b)Whole number
- c)Irrational number
- d)Natural number
Correct answer is option 'C'. Can you explain this answer?
The product or quotient of a non-zero rational number with an irrational number is:
a)
Rational number
b)
Whole number
c)
Irrational number
d)
Natural number
|
Molik answered |
let the no. be 2 and√2so product of it is 2√2 I.e a rational no.
The value obtained on simplifying (√5 + √6)2
- a)12 + 5√30
- b)13 + 2√33
- c)11 - 2√30
- d)11 + 2√30
Correct answer is option 'D'. Can you explain this answer?
The value obtained on simplifying (√5 + √6)2
a)
12 + 5√30
b)
13 + 2√33
c)
11 - 2√30
d)
11 + 2√30
|
|
Pooja Shah answered |
(a + b)2 = a2 + b2 + 2ab
= (√5 + √6)2
= (√5)2 + (√6)2 + 2(√5)(√6)
= (√5 + √6)2
= (√5)2 + (√6)2 + 2(√5)(√6)
= 5 + 6 +2√30
= 11 + 2√30
Of the given numbers
(i) √23
(ii) √256
(iii) 0.3796
(iv) 7.478478…
(v) 1.101001000100001…
- a)(i) and (v) are irrational
- b)(iv) and (v) is irrational
- c)only (v) is irrational
- d)none are irrational
Correct answer is option 'A'. Can you explain this answer?
Of the given numbers
(i) √23
(ii) √256
(iii) 0.3796
(iv) 7.478478…
(v) 1.101001000100001…
(i) √23
(ii) √256
(iii) 0.3796
(iv) 7.478478…
(v) 1.101001000100001…
a)
(i) and (v) are irrational
b)
(iv) and (v) is irrational
c)
only (v) is irrational
d)
none are irrational
|
EduRev Class 9 answered |
i) √23
√23 = √23/1 = p/q, but p is not an integer.
Hence √23 is an irrational number.
ii) √225
√225 = 15/1 = p/q, where p and q are integers and q ≠ 0.
Hence √225 is a rational number.
iii) 0.3796
0.3796 is a rational number because it is a terminating decimal number.
iv) 7.478478...
7.478478... is a rational number as it is a non-terminating recurring decimal i.e, the block of numbers 478 is repeating.
v) 1.101001000100001 . . . .
It is an irrational number because it is a non-terminating and non-recurring decimal.
The product of two numbers is -20/9. If one of the numbers is 4, find the other.
- a)–5/9
- b)3/11
- c)12/39
- d)–9/11
Correct answer is option 'A'. Can you explain this answer?
The product of two numbers is -20/9. If one of the numbers is 4, find the other.
a)
–5/9
b)
3/11
c)
12/39
d)
–9/11
|
|
Tamanna Aujla answered |
The answer is -5/9 because -5/9 x 4 =-20/9
An irrational number between 2/5 and 3/7 is :- a)1/7
- b)0.4381923…
- c)7/10
- d)√6/35
Correct answer is option 'D'. Can you explain this answer?
An irrational number between 2/5 and 3/7 is :
a)
1/7
b)
0.4381923…
c)
7/10
d)
√6/35
|
Nehmat Kaur answered |
Co-Prime Numbers
Co-prime numbers are the numbers which have no common factors other than 1. In other words, two numbers are said to be co-prime if their HCF (highest common factor) is 1.
Explanation
- Option 'A', 2 and 3 are co-prime numbers because they have no common factors other than 1. Therefore, the correct answer is option 'A'.
- Option 'B', 2 and 4 are not co-prime numbers because they have a common factor of 2.
- Option 'C', 2 and 6 are not co-prime numbers because they have a common factor of 2.
- Option 'D', 2 and 110 are not co-prime numbers because they have a common factor of 2.
Therefore, the only pair of co-prime numbers among the given options is 2 and 3, which is option 'A'.
Co-prime numbers are the numbers which have no common factors other than 1. In other words, two numbers are said to be co-prime if their HCF (highest common factor) is 1.
Explanation
- Option 'A', 2 and 3 are co-prime numbers because they have no common factors other than 1. Therefore, the correct answer is option 'A'.
- Option 'B', 2 and 4 are not co-prime numbers because they have a common factor of 2.
- Option 'C', 2 and 6 are not co-prime numbers because they have a common factor of 2.
- Option 'D', 2 and 110 are not co-prime numbers because they have a common factor of 2.
Therefore, the only pair of co-prime numbers among the given options is 2 and 3, which is option 'A'.
Given that 
∠A = 50° ∠C = 35° ∠E = ?
- a)95°
- b)105°
- c)45°
- d)65°
Correct answer is option 'A'. Can you explain this answer?
Given that ∠A = 50° ∠C = 35° ∠E = ?
∠A = 50° ∠C = 35° ∠E = ?a)
95°
b)
105°
c)
45°
d)
65°
|
Anshika Rajput answered |
Since the two triangles are similar so
angle B= angle E
so in triangle ABC if you find the value of angle B then u Will find the answer as 95.
because sum of these three angles of the triangle is 180.and
angle B= 180-(angle A+ angle C)
so angle B=180-(50+35)
angle B=95.
angle B= angle E
so in triangle ABC if you find the value of angle B then u Will find the answer as 95.
because sum of these three angles of the triangle is 180.and
angle B= 180-(angle A+ angle C)
so angle B=180-(50+35)
angle B=95.
Charge of an electron is 0.000,000,000,000,000,000,16 coulomb and in exponential form it can be written as- a)16 × 10-18 coulomb
- b) 1.6 × 10-21 coulomb
- c)1.6 × 10-19 coulomb
- d) 16 × 10-21 coulomb
Correct answer is option 'C'. Can you explain this answer?
Charge of an electron is 0.000,000,000,000,000,000,16 coulomb and in exponential form it can be written as
a)
16 × 10-18 coulomb
b)
1.6 × 10-21 coulomb
c)
1.6 × 10-19 coulomb
d)
16 × 10-21 coulomb
|
Amit Sharma answered |
Any number written in the form m x 10n is a standard form if m is between 1 and 10, so we have 18 zeros before 16 and after decimal and one decimal place after 1 to make 16 less than 10. So we have 1.6 x 10-19.
7 × 10-5 m is the standard form of which of the following- a)0.0007 m
- b)0.000007 m
- c)0.0000007 m
- d)0.00007 m
Correct answer is option 'D'. Can you explain this answer?
7 × 10-5 m is the standard form of which of the following
a)
0.0007 m
b)
0.000007 m
c)
0.0000007 m
d)
0.00007 m
|
|
Sahil Unni answered |
The number 7 is a prime number, meaning it is only divisible by 1 and itself. It is the fourth smallest prime number and is often considered a lucky number in many cultures.
In standard form 21600000 is written as
- a)2.16 × 107
- b)216 × 107
- c)2.16 × 105
- d)216 × 100000
Correct answer is option 'A'. Can you explain this answer?
In standard form 21600000 is written as
a)
2.16 × 107
b)
216 × 107
c)
2.16 × 105
d)
216 × 100000
|
|
C K Academy answered |
count from rigth to left till you get last non-zero number
like here 2 is the last non-zero number and for it we have to count 7 times
then write 2.16x 107
like here 2 is the last non-zero number and for it we have to count 7 times
then write 2.16x 107
On simplifying (√5 + √7)2 we get
- a)12
- b)√35
- c)√5 + √7
- d)12 + 2√35
Correct answer is option 'D'. Can you explain this answer?
On simplifying (√5 + √7)2 we get
a)
12
b)
√35
c)
√5 + √7
d)
12 + 2√35
|
|
Krishna Iyer answered |
(√5 + √7)2 = (√5)2 + (√7)2 + 2(√5)(√7)
= 5 + 7 + 2√35
= 12 + 2√35
The Base in the expression 8100 is- a)10
- b)100
- c)8
- d)800
Correct answer is option 'C'. Can you explain this answer?
The Base in the expression 8100 is
a)
10
b)
100
c)
8
d)
800
|
Geetika Shah answered |
8100
In this equation, 8 is the base and 100 is the exponent.
Convert 7/25 in the form of decimals,- a)0.35
- b)6.26
- c)0.27
- d)0.28
Correct answer is option 'D'. Can you explain this answer?
Convert 7/25 in the form of decimals,
a)
0.35
b)
6.26
c)
0.27
d)
0.28
|
|
Swati Swarupa Sahu answered |
7÷25
=(7×4)÷(25×4)
=28÷100
=0.28
=(7×4)÷(25×4)
=28÷100
=0.28
(√12 + √10 - √2) is
- a)a positive rational number
- b) equal to zero
- c)an irrational number
- d)a negative integer
Correct answer is option 'C'. Can you explain this answer?
(√12 + √10 - √2) is
a)
a positive rational number
b)
equal to zero
c)
an irrational number
d)
a negative integer
|
|
EduRev Class 9 answered |
addition of irrational number to another irrational number will give another irrational number
The exponential form of (1/8 )× (3)-3 is given by which of the following expression:
- a)6-3
- b)23
- c)3-6
- d)5-3
Correct answer is option 'A'. Can you explain this answer?
The exponential form of (1/8 )× (3)-3 is given by which of the following expression:
a)
6-3
b)
23
c)
3-6
d)
5-3
|
|
Ananya Roy answered |
The exponential form of 1/8 is 8^-1.
The value of (2/3)-2 is
- a)4/9
- b)-2/9
- c)9/4
- d)0
Correct answer is option 'C'. Can you explain this answer?
The value of (2/3)-2 is
a)
4/9
b)
-2/9
c)
9/4
d)
0
|
|
Shivani Khanna answered |
Solution:
Given, (2/3)-2
We know that, (a/b)-c=(a- bc)/b
So, (2/3)-2 = (2-6)/3 = -4/3
Now, we need to simplify this answer to match with the given options.
Multiplying both the numerator and denominator by -1, we get,
-4/3= (-1)×(4/3)= -4/(-3)=4/3
Therefore, the value of (2/3)-2 is 4/3, which is represented by option C.
Given, (2/3)-2
We know that, (a/b)-c=(a- bc)/b
So, (2/3)-2 = (2-6)/3 = -4/3
Now, we need to simplify this answer to match with the given options.
Multiplying both the numerator and denominator by -1, we get,
-4/3= (-1)×(4/3)= -4/(-3)=4/3
Therefore, the value of (2/3)-2 is 4/3, which is represented by option C.
An irrational number between 5/7 and 7/9 is :
- a)0.7512
- b)0.75
- c)0.750750075000…
- d)√6
Correct answer is option 'C'. Can you explain this answer?
An irrational number between 5/7 and 7/9 is :
a)
0.7512
b)
0.75
c)
0.750750075000…
d)
√6
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EduRev Class 9 answered |
There are infinitely many irrational numbers between 5/7 and 7/9.
(0.7507500075000.... is also an irrational number between 5/7 and 7/9;but it is not the only one;there are many others)
(0.7507500075000.... is also an irrational number between 5/7 and 7/9;but it is not the only one;there are many others)
32 is the multiplicative inverse of- a)1/9
- b)1/3-2
- c)6
- d)1/23
Correct answer is option 'A'. Can you explain this answer?
32 is the multiplicative inverse of
a)
1/9
b)
1/3-2
c)
6
d)
1/23
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Sushma Rajput answered |
Is me kya explain kr na h??
64 is the multiplicative inverse of - a)2-8
- b)82
- c)1/82
- d)24
Correct answer is option 'C'. Can you explain this answer?
64 is the multiplicative inverse of
a)
2-8
b)
82
c)
1/82
d)
24
|
Navya Rane answered |
Explanation:
Multiplicative inverse is a number which when multiplied by the given number gives the product as 1.
To find the multiplicative inverse of a number, we need to divide 1 by that number.
Let's check the options given:
a) 2^-8 = 1/2^8 = 1/256, which is not equal to 64, so it is not the correct answer.
b) 82 = 64, which is not the multiplicative inverse of 64, so it is not the correct answer.
c) 1/82 = 0.012195..., when we multiply 64 by 0.012195... we get 0.780487..., which is very close to 1, but not exactly 1 due to rounding. However, we can say that 1/82 is the multiplicative inverse of 64.
d) 24 = 1/64, which is not the correct answer.
Therefore, the correct answer is option c) 1/82.
Multiplicative inverse is a number which when multiplied by the given number gives the product as 1.
To find the multiplicative inverse of a number, we need to divide 1 by that number.
Let's check the options given:
a) 2^-8 = 1/2^8 = 1/256, which is not equal to 64, so it is not the correct answer.
b) 82 = 64, which is not the multiplicative inverse of 64, so it is not the correct answer.
c) 1/82 = 0.012195..., when we multiply 64 by 0.012195... we get 0.780487..., which is very close to 1, but not exactly 1 due to rounding. However, we can say that 1/82 is the multiplicative inverse of 64.
d) 24 = 1/64, which is not the correct answer.
Therefore, the correct answer is option c) 1/82.
Usual form of the expression 3 X 10-5 is given by- a)0.00003
- b)0.000003
- c)30 X 10-4
- d)0.03 X 10-3
Correct answer is option 'A'. Can you explain this answer?
Usual form of the expression 3 X 10-5 is given by
a)
0.00003
b)
0.000003
c)
30 X 10-4
d)
0.03 X 10-3
|
Sahana Sen answered |
Since the power is negative, we move 5 place to the left including 3.So answer is 0.00003
Which of the following statements is false?- a)Rational numbers have a terminating or non terminating repeating decimal form.
- b)Irrational numbers can be written in the form p/q where q is non zero and both p, q are integers
- c)Rational numbers can be written in the form p/q where q is non zero and both p,q are integers
- d)Every number on the number line is either rational or irrational, there’s no third alterntative
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is false?
a)
Rational numbers have a terminating or non terminating repeating decimal form.
b)
Irrational numbers can be written in the form p/q where q is non zero and both p, q are integers
c)
Rational numbers can be written in the form p/q where q is non zero and both p,q are integers
d)
Every number on the number line is either rational or irrational, there’s no third alterntative
|
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Nirali Shah answered |
B) Irrational numbers can be written in the form p/q where q is non zero and both p, q are integers.
This statement is false. Irrational numbers cannot be written in the form p/q, where p and q are integers with q being nonzero. Irrational numbers cannot be expressed as a fraction and have non-repeating, non-terminating decimal representations.
This statement is false. Irrational numbers cannot be written in the form p/q, where p and q are integers with q being nonzero. Irrational numbers cannot be expressed as a fraction and have non-repeating, non-terminating decimal representations.
The standard form of 9030000000 is given by
- a)9.03 × 109
- b)90.3 × 107
- c)903 × 106
- d)9.03 × 10-9
Correct answer is option 'A'. Can you explain this answer?
The standard form of 9030000000 is given by
a)
9.03 × 109
b)
90.3 × 107
c)
903 × 106
d)
9.03 × 10-9
|
|
EduRev Class 8 answered |
Explanation:
- To convert a number into standard form, we need to express it as a number between 1 and 10 multiplied by a power of 10.
- For the number 9030000000, we can express it as 9.03 × 109.
- Therefore, the standard form of 9030000000 is A: 9.03 × 109.
The decimal expansion 0.080080008000080000080000008….. is a- a)Non-terminating, non-recurring
- b)Non-terminating, recurring
- c)Terminating ,recurring
- d)Terminating, non-recurring
Correct answer is option 'A'. Can you explain this answer?
The decimal expansion 0.080080008000080000080000008….. is a
a)
Non-terminating, non-recurring
b)
Non-terminating, recurring
c)
Terminating ,recurring
d)
Terminating, non-recurring
|
|
Ananya Das answered |
The decimal expansion 0.080080008000080000080000008….. is a. Non-terminating, non-recurring. Non-terminating, recurring.
Which one of the following is the value of 35- a)3
- b)15
- c)2
- d)243
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is the value of 35
a)
3
b)
15
c)
2
d)
243
|
Sharathan B answered |
3 power 5 which means 5 times 3 which is 3×3×3×3×3=243
Find the value of the expression a2 for a = 10.- a)100
- b)1
- c)10
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Find the value of the expression a2 for a = 10.
a)
100
b)
1
c)
10
d)
None of these
|
Sathvika answered |
Multiply 10 twice i.e 10 × 10 because they asked 'a' to the power 2 . so multiply by twice, the solution is 100 .
In exponential form 140,000,000,000 Kg is given by ............- a)1.4 × 1010 Kg
- b)1.4 × 109 Kg
- c)14 × 108 Kg
- d)1.4 × 1011 Kg
Correct answer is option 'D'. Can you explain this answer?
In exponential form 140,000,000,000 Kg is given by ............
a)
1.4 × 1010 Kg
b)
1.4 × 109 Kg
c)
14 × 108 Kg
d)
1.4 × 1011 Kg
|
|
Abhiram Chavan answered |
X 10^11 Kg b)1.4 x 10^12 Kg c)1.4 x 10^10 Kg d)1.4 x 10^9 Kg
Answer: b) 1.4 x 10^12 Kg
Answer: b) 1.4 x 10^12 Kg
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Mathematics: Algebra 1
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