2086 . If the radius of a circle is increased by 20% then the area is increased by :

A. 44%
B. 400%
C. 40%
D. 120%

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Answer: Option A

Explanation:

যুব ও ক্রীড়া মন্ত্রণালয়ের যুব উন্নয়ন অধিদপ্তর | ক্যাশিয়ার | ০৪.০৫.২০১৮

A. .36%
B. 3.6%
C. 6%
D. 12.36%
E. 36%

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Answer: Option D

Explanation:

2088 . If the radius of a circle is reduced by 40%, its circumference is reduced by-

A. 60%
B. 40%
C. 35%
D. 30%

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Answer: Option B

Explanation:

If the radius of a circle will be reduced by 40% its circumference will also be reduced by 40% because circumference of circle is directly dependent on radius of the circle as the formula to find the circumference is Circumference= 2πr or πd
d is diameter which is 2r

Janata Bank PLC || Officer (Rural Credit) (27-10-2023) || 2023

A. multiplied by 3
B. multiplied by 6
C. multiplied by 9
D. multiplied by 12

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Answer: Option A

Explanation:

When the radius of a circle is tripled, the circumference is multiplied by 3.

The formula for the circumference of a circle is C = 2πr, where "C" is the circumference and "r" is the radius. If you triple the radius, the new radius becomes 3r.

So, the new circumference will be:

New Circumference = 2π(3r) = 6πr

This is three times the original circumference (2πr), which means it's multiplied by 3.

সহকারী পরিচালক(AD) -12.11.2021

A. Tk 4630.00
B. Tk 4630.50
C. Tk 4631.50
D. Tk. 4632.00

View Answer	Favorite Question

Answer: Option B

Explanation:

সমন্বিত ৭ ব্যাংক ও ১টি আর্থিক | সিনিয়র_অফিসার | 27-11-2021

A. 3%
B. 12%
C. 10%
D. 8%

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Answer: Option B

Explanation:

The ratio of the principal amount (P) to the yearly amount (A) is given as 25:28. This means:

P/A = 25/28

To find the yearly rate of interest (R), we can use the formula for simple interest:

Simple Interest (SI) = (P * R * T) / 100

Where: SI = Simple Interest P = Principal amount R = Rate of interest (yearly rate) T = Time (in years)

We are given that the ratio of P to A is 25:28, which means:

P/A = 25/28

So, we can express P in terms of A as:

P = (25/28) * A

Now, let's calculate the simple interest using the given principal and yearly amount:

SI = A - P

Substitute the values of P and A:

SI = A - [(25/28) * A]

To find the rate of interest (R), we need to find the percentage of SI with respect to the principal amount (P):

R = (SI / P) * 100

R = { [A - (25/28) * A] / [(25/28) * A] } * 100

Simplify the expression:

R = { [28A - 25A] / (25A) } * 100

R = (3A / 25A) * 100

R = (3/25) * 100

R = 12%

So, the yearly rate of interest is 12%.

সমন্বিত ৭ ব্যাংক || সিনিয়র অফিসার-05-11-2021 ||

A. 12 years
B. 8 years
C. 10 years
D. 16 years

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Answer: Option B

Explanation:

জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 15 : 5 : 3
B. 15 : 5 : 7
C. 3 : 15 : 5
D. 15 : 3 : 5

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Answer: Option A

Explanation:

জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 3/5
B. 2/7
C. 1/3
D. 1/2

View Answer	Favorite Question

Answer: Option A

Explanation:

আমরা জানি,
বৃত্তকলার ক্ষেত্রফল = θ/360πr2

বৃত্তের ক্ষেত্রফল = πr2

শর্তমতে, θ/360πr2:πr2=3:5

⇒θ360πr2/πr2 =3/5

⇒θ/360=3/5

.:. বৃত্তকলার দৈর্ঘ্য ও বৃত্তের পরিধির অনুপাত = θ/360×2πr
____________
2πr

=θ/360=3/5

জীবণ বীমা কর্পোরেশন (সহকারী ম্যানেজার) 16-10-2020

A. 4 : 9
B. 9 : 4
C. 2 : 3
D. 3 : 4

View Answer	Favorite Question

Answer: Option B

Explanation:

area of circle = pi * r2
a1 / a2 = r1 2 / r2 2 = (3) 2 / (2) 2 = 9 / 4

2096 . If the result obtained by multiplying a number x by a number 1 less itself is 4 less than multiplying x by itself, then x =?

A. 4
B. 5
C. 6
D. 2

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Answer: Option A

Explanation:

The given information can be represented as:

X * (X - 1) = X^2 - 4

Now, since it is mentioned that the result obtained by multiplying X by a number 1 less than itself is 4 less than multiplying X by itself,

we can set up the equation:

X * (X - 1) = X * X - 4

or, X^2 - X = X^2 - 4

or, -X = -4

So, X = 4

2097 . If the salary of an employee is reduced by 10 percent for his late attendance and then increased by 10 percent on a pardon, how much does he loss?

A. 2%
B. 1%
C. 1/2%
D. 9%

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Answer: Option B

Explanation:

এখানে, শতকরা হ্রাস পেলো = 10 - 10 - 10 × 10/100 = - 1%

সু্তরাং, শতকরা 1% হ্রাস পেল।

2098 . If the sales tax on an appliance priced at Tk.300 is between 5% and 8%, then the cost (price plus sales tax) of the appliance can be:

A. 310
B. 325
C. 318
D. 314

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Answer: Option C

Explanation:

minimum value = 300 + .05 * 300 = 315
maximum value = 300 + 0.08 * 300 = 324
318 it is !!

2099 . If the side of a square increases by 40%, then the area of the square increases by-

A. 16%
B. 96%
C. 116%
D. 140%
E. None of these

View Answer	Favorite Question

Answer: Option B

Explanation:

বাংলাদেশ বনশিল্প উন্নয়ন কর্পোরেশন সহকারী ব্যবস্থাপক-০২.০৮.২০১৩

A. 16%
B. 21%
C. 32%
D. 100%

View Answer	Favorite Question

Answer: Option B

Explanation:

2086 . If the radius of a circle is increased by 20% then the area is increased by :

2087 . If the radius of a circle is increased by 6%, then the area of the circle is increased by ---

2088 . If the radius of a circle is reduced by 40%, its circumference is reduced by-

2089 . If the radius of a circle is tripled, the circumference is

2090 . If the rate if interest is 10 % per annum and is comunded half yearly , the principal of Tk.l 4000 in years will amount to-

2091 . If the ratio of principal and yearly amount be in the ratio 25: 28, then the yearly rate of interest is

2092 . If the ratio of simple interest and principal is 8 : 25 and rate of interest is equal to the time invested then find the time of investment ?

2093 . If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?

2094 . If the ratio of the area of a sector to the area of the circle is 3:5. What is the ratio of the legth of theare in the sector to the circumference of the circle?

2095 . If the ratio of the radii of the two circles is 3 : 2, than the ratio of the areas of the two circles is:

2096 . If the result obtained by multiplying a number x by a number 1 less itself is 4 less than multiplying x by itself, then x =?

2097 . If the salary of an employee is reduced by 10 percent for his late attendance and then increased by 10 percent on a pardon, how much does he loss?

2098 . If the sales tax on an appliance priced at Tk.300 is between 5% and 8%, then the cost (price plus sales tax) of the appliance can be:

2099 . If the side of a square increases by 40%, then the area of the square increases by-

2100 . If the sides of a square is increased by 10%, by what percent will the area of the square be increased ?

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