Brain Champs-for Class 9
It is a mixture of few types of maths topics. It contains POLYNOMIALS,ALGEBRA etc. All questions are multiple choice. It is an interesting quiz.
- 1.
If x/0.1= m,what will be x*0.01?
- A.
0.001m
- B.
0.1m
- C.
10m
- D.
1000m
- E.
0.0001m
Correct Answer
A. 0.001mExplanation
When we have the equation x/0.1 = m, we can rearrange it to x = 0.1m.
Now, if we multiply x by 0.01, we get (0.1m)(0.01) = 0.001m.
Therefore, the answer is 0.001m.Rate this question:
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- 2.
What is the measure of angle DCB in the paralleogram ABCD given below?If angleDCA=31 and angle DAB=44?
- A.
62
- B.
75
- C.
88
- D.
105
- E.
120
Correct Answer
B. 75Explanation
In a parallelogram, opposite angles are equal. Therefore, angle DCB is equal to angle DAB, which is given as 44 degrees.Rate this question:
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- 3.
Which is 'not' a integer?
- A.
(3)-5
- B.
(-3)-5
- C.
(1/3)-5
- D.
(1+3)-5
- E.
(1-3)-5
Correct Answer
A. (3)-5Explanation
The expression (3)-5 is not a valid mathematical expression. The correct way to write it would be 3 - 5. Therefore, (3)-5 is not an integer.Rate this question:
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- 4.
The square root of 27225 lies between?
- A.
50-60
- B.
120-130
- C.
160-170
- D.
500-600
- E.
570-670
Correct Answer
C. 160-170Explanation
The square root of 27225 is approximately 165. Therefore, it lies between the range of 160-170.Rate this question:
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- 5.
The sum of 3 numbers is 'k'.Each number is incresed by 15 and then the resulting number are doubled.What would be the sum of the new numbers?
- A.
2k+15
- B.
2k+30
- C.
2k+90
- D.
6k+30
- E.
6k+90
Correct Answer
C. 2k+90Explanation
When each number is increased by 15, the sum of the three new numbers would be 3k + 45. Then, when these resulting numbers are doubled, each number becomes 2 times its original value. Therefore, the sum of the new numbers would be 2(3k + 45), which simplifies to 6k + 90.Rate this question:
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- 6.
Adding 5% of a number to itself is the same as multiplying the number by .............
- A.
1.05
- B.
1.5
- C.
5
- D.
105
- E.
1.075
Correct Answer
A. 1.05Explanation
Adding 5% of a number to itself is equivalent to multiplying the number by 1.05. This is because 5% of a number can be calculated by multiplying the number by 0.05. Adding this result to the original number is the same as multiplying the original number by 1.05.Rate this question:
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- 7.
X and y are 2 different numbers.What can be added to 6x to get 9y?
- A.
3y
- B.
3x
- C.
9y-3x
- D.
9y+3x
- E.
It is not possible to get 9y as 6x and 9y are not like terms
Correct Answer
C. 9y-3xExplanation
To get 9y, we need to add 9y-6x. This is because 6x and 9y are not like terms, so we cannot simply add them together. Therefore, the correct answer is 9y-3x.Rate this question:
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- 8.
If x/y=70,x/2y=?
- A.
35
- B.
68
- C.
72
- D.
140
- E.
70
Correct Answer
A. 35Explanation
If x/y = 70, it means that x is 70 times greater than y. To find x/2y, we can substitute the value of x/y into the equation. Therefore, x/2y = (70y)/2y = 35. This means that x/2y is equal to 35.Rate this question:
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- 9.
(3)20+(3)20+(3)20+
- A.
(9)60
- B.
(9)20
- C.
(9)40
- D.
(3)60
- E.
(3)21
Correct Answer
E. (3)21Explanation
The given expression consists of multiple terms, each enclosed in parentheses and separated by a plus sign. Each term is a multiplication of a number inside the parentheses with a number outside the parentheses. The expression can be simplified by performing the multiplications first and then adding the results. In this case, we have (3)20 + (3)20 + (3)20, which simplifies to 60 + 60 + 60 = 180. Therefore, the correct answer is 180.Rate this question:
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- 10.
The volume of a cube is 64cm cube.What is the sum of lengths of all its edges?
- A.
24cm
- B.
32cm
- C.
48cm
- D.
64cm
- E.
52cm
Correct Answer
C. 48cmExplanation
The volume of a cube is found by multiplying the length of one of its edges by itself three times. In this case, if the volume is 64cm^3, then the length of one edge is the cube root of 64, which is 4cm. Since a cube has 12 edges of equal length, the sum of the lengths of all its edges would be 12 times the length of one edge, which is 12 * 4cm = 48cm.Rate this question:
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Mar 21, 2023Quiz Edited by
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Mar 07, 2010Quiz Created by
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