BRAIN CHAMPS-FOR CLASS 9

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| By Harshit95

Harshit95

Community Contributor

Quizzes Created: 1 | Total Attempts: 220

Questions: 10 | Attempts: 222 | Updated: Mar 21, 2023

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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.

Questions and Answers

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. 0.001m

Explanation
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.

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0
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. 75

Explanation
In a parallelogram, opposite angles are equal. Therefore, angle DCB is equal to angle DAB, which is given as 44 degrees.

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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)-5

Explanation
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.

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1
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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. 160-170

Explanation
The square root of 27225 is approximately 165. Therefore, it lies between the range of 160-170.

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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+90

Explanation
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.

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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. 1.05

Explanation
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.

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1
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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-3x

Explanation
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.

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8.

If x/y=70,x/2y=?
- A.
  
  35
- B.
  
  68
- C.
  
  72
- D.
  
  140
- E.
  
  70
Correct Answer
A. 35

Explanation
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.

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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)21

Explanation
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.

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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. 48cm

Explanation
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.

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Mar 07, 2010

Quiz Created by
Harshit95

Brain Champs-for Class 9

If x/0.1= m,what will be x*0.01?

What is the measure of angle DCB in the paralleogram ABCD given below?If angleDCA=31 and angle DAB=44?

Which is 'not' a integer?

The square root of 27225 lies between?

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?

Adding 5% of a number to itself is the same as multiplying the number by .............

X and y are 2 different numbers.What can be added to 6x to get 9y?

If x/y=70,x/2y=?

(3)20+(3)20+(3)20+

The volume of a cube is 64cm cube.What is the sum of lengths of all its edges?