Class 8 Maths Mock Test
(548).jpg "Class 8 Maths Mock Test - Quiz")
If you are a student of class 8th and looking for an online mathematics mock test to evaluate your knowledge regarding this subject, you should try this simple quiz. It contains questions related to fractions, multiplications, and prime numbers. You can surely secure 100% marks on this test only if your basics are strong in Math. So, what else do you need? Get ready to test your understanding of mathematics. Best of luck to you.
- 1.
If 5^12 x 125 = 5^3x, find the value of x
- A.
2
- B.
4
- C.
3
- D.
5
Correct Answer
D. 5Explanation
To find the value of x in the equation 5^12 x 125 = 5^3x, you can use the properties of exponents to equate the powers of 5 on both sides:
5^12 x 125 = 5^3x
First, simplify the left side:
5^12 x 125 = 5^12 x 5^3
Now, apply the rule for multiplying numbers with the same base when you have the same base raised to different exponents; you add the exponents:
5^(12 + 3) = 5^15
So, the equation becomes:
5^15 = 5^3x
Now that the bases are the same (both 5), you can equate the exponents:
15 = 3x
To solve for x, divide both sides by 3:
15 / 3 = x
x = 5
So, the value of x is 5.Rate this question:
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- 2.
6.37 x 10-4 in its usual form:
- A.
63700
- B.
6370000
- C.
0.00637
- D.
0.000637
Correct Answer
D. 0.000637Explanation
The given number, 6.37 x 10-4, is in scientific notation. In scientific notation, a number is expressed as a decimal multiplied by a power of 10. In this case, 6.37 x 10-4 means that the decimal 6.37 is multiplied by 10 raised to the power of -4. To convert it to its usual form, we move the decimal point 4 places to the left, resulting in 0.000637. Therefore, the correct answer is 0.000637.Rate this question:
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- 3.
What is to be multiplied by (-15/16) to get 5/6 ?
- A.
8/9
- B.
-8/9
- C.
-3/8
- D.
3/8
Correct Answer
B. -8/9Explanation
To find the number that needs to be multiplied by (-15/16) to get 5/6, we can set up a proportion. Let the unknown number be represented by x. So, (-15/16) * x = 5/6. To solve for x, we can cross-multiply and then divide both sides by (-15/16). This simplifies to x = (5/6) * (-16/15), which equals -8/9. Therefore, the correct answer is -8/9.Rate this question:
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- 4.
Which property is this 5/6 -+ 2/3 = 2/3 + 5/6
- A.
Associative
- B.
Commutative
- C.
Distributive
- D.
Closure
Correct Answer
B. CommutativeExplanation
The given equation 5/6 -+ 2/3 = 2/3 + 5/6 shows that the order of addition or subtraction does not affect the result. The terms 5/6 and 2/3 can be rearranged on either side of the equation, and the result will still be the same. This property is known as the commutative property of addition.Rate this question:
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- 5.
Which is bigger; -9/13 or -11/26
Correct Answer
-11/26Explanation
The given question asks to compare -9/13 and -11/26. To compare fractions with different denominators, we need to find a common denominator. In this case, the common denominator is 26. When we convert -9/13 to have a denominator of 26, we get -18/26. Comparing -18/26 and -11/26, we can see that -11/26 is bigger because it has a smaller numerator. Therefore, the correct answer is -11/26.Rate this question:
- 6.
50 times of 8 is equal to
- A.
40
- B.
4000
- C.
8000
- D.
400
Correct Answer
D. 400Explanation
The correct answer is 400 because when you multiply 50 by 8, you get 400.Rate this question:
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- 7.
The missing terms in multiple of 3: 3, 6, 9, __, 15 is
Correct Answer
12Explanation
The missing terms in the sequence are multiples of 3. The given sequence starts with 3, then adds 3 each time to get the next term. Therefore, the missing term after 9 would be 12, as it is the next multiple of 3 in the sequence.Rate this question:
- 8.
What is to be added to 5/4 to get 1?
Correct Answer
-1/4Explanation
To find what needs to be added to 5/4 to get 1, we subtract 5/4 from 1. This can be done by finding a common denominator, which is 4 in this case. So, 1 can be written as 4/4. Subtracting 5/4 from 4/4 gives us -1/4. Therefore, -1/4 needs to be added to 5/4 to get 1.Rate this question:
- 9.
Smallest prime number that is an even number too
- A.
0
- B.
1
- C.
2
- D.
3
Correct Answer
C. 2Explanation
The smallest prime number is 2, and it is also an even number because it is divisible by 2.Rate this question:
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- 10.
The multiplicative identity of rational number is
- A.
0
- B.
1
- C.
-1
- D.
None of these
Correct Answer
B. 1Explanation
The multiplicative identity of a rational number is the number that, when multiplied by any rational number, gives the same rational number as the result. In this case, the number 1 satisfies this condition. When any rational number is multiplied by 1, the result is always the same rational number. Therefore, the correct answer is 1.Rate this question:
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Dec 06, 2023Quiz Edited by
ProProfs Editorial Team -
Jun 02, 2022Quiz Created by
Alfredhook3
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