Bangladesh Bank - Assistant Director - 2010

মোট প্রশ্ন: ৭৬

পৃষ্ঠা এর পরবর্তী

The argument in the passage would be most seriously weakened if it were true that

.
In 2007 smugglers of banned products had significantly more funds
.
Domestic production of illegal drugs increased considerably in 2007
✓ সঠিক উত্তর
.
The authors statements were made to embarrass the officials
.
In 2007 banned products entered the country by a different set of routes

ব্যাখ্যা

-
বিষয়: গণিতটপিক: মানসিক দক্ষতা (Mental skills)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

" Price of vegetables is very high in city area in comparison to that in rural area." This claim is weakened by the following facts except :

.
There is least demand for vegetable in city area
.
vegetables are subject to downward price control in city area by the government
.
City dwellers purchase vegetable produced only in the city area
.
Vegetables are mostly common item of every meal of a city dweller

ব্যাখ্যা

To weaken the claim that "Price of vegetables is very high in city area in comparison to that in rural area," we need to find a fact that contradicts or undermines this claim. Let's analyze the options provided:
বিষয়: গণিতটপিক: পরিমিতি (Mensuration)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

If the length of rectangle is increased by 30% and the width is decreased by 30%, then the area will be --

.
Decreased by 9%
✓ সঠিক উত্তর
.
Increased by 9%
.
Decreased by 18%
.
Increased by 16%
বিষয়: গণিতটপিক: শতকরা (Percentage)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is :

.
30
✓ সঠিক উত্তর
.
35
.
25
.
40

ব্যাখ্যা

No. of students = 40
বিষয়: গণিতটপিক: গড় (Average)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

729ml of a mixture contains milk and water in ratio 7 : 2 . How much of the water is to be added to get a new mixture containing half milk and half water ?

.
405ml
✓ সঠিক উত্তর
.
81ml
.
72ml
.
91ml

ব্যাখ্যা

729 * 7/9 = 81 * 7 = 567 = Milk
বিষয়: গণিতটপিক: অনুপাত-সমানুপাত (Ratio-Proportion)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

The sum of 3 consecutive odd numbers is 57. The middle one is -

.
19
✓ সঠিক উত্তর
.
21
.
23
.
17

ব্যাখ্যা

x , x + 2 , x + 4
বিষয়: গণিতটপিক: সমীকরণের প্রয়োগ (Application of Equation)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

Today is Monday. After 61 days, it will be :

.
Wednesday
.
Saturday
✓ সঠিক উত্তর
.
Tuesday
.
Thursday

ব্যাখ্যা

7*9 = 63
বিষয়: গণিতটপিক: পঞ্জিকা (Calendar)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

In a box , there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green ?

.
1/3
✓ সঠিক উত্তর
.
3/4
.
7/19
.
8/21

ব্যাখ্যা

Probability = Favorable outcome/ Total No. of outcome
বিষয়: গণিতটপিক: সম্ভাব্যতা (Probability)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010

Mr. A is 5 years senior to Mr. B, Mr. B is 3 years senior to Mr. C, Mr. C is 2 years junior to Mr. D in job experience . If Mr. D has is years job experience than how many years of experience possessing Mr. A ?

.
18
.
19
.
20
.
17

ব্যাখ্যা

Job experience of Mr.D = 15
বিষয়: গণিতটপিক: বয়স (Ages)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১০

The sum of principal and simple interest of a certain amount of money would be TK. 460 after three years from now and TK. 500 after 5 years from now . What is the related interest rate ?

.
18%
.
15%
.
26%
.
5%
✓ সঠিক উত্তর

ব্যাখ্যা

Solution: 
বিষয়: গণিতটপিক: সরল ও যৌগিক মুনাফা  (Simple & Compound interest)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১১

Mr. A has won an election by a vote of 250 to 150 . What part of the total vote was against him ?

.
2/5
.
3/5
.
4/7
.
7/15
বিষয়: গণিতটপিক: ভগ্নাংশ (Fraction)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১২

There are 8 more men than women on board of directors of a company. If there are 20 members on the board, how many are men ?

.
6
.
8
.
12
.
14
✓ সঠিক উত্তর
বিষয়: গণিতরেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৩

A garden of 100 meter length and 60 meter width has a walkway of 2 meter width on every side . What is the area of the garden, in square meters , excluding the walkway ?

.
5684
.
6000
.
624
.
5376
✓ সঠিক উত্তর
বিষয়: গণিতটপিক: পরিমিতি (Mensuration)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৪

Of the 3,600 employees of ABC Ltd, 1/3 are clerical . If clerical staff were to be reduced by 1/3,what percent of the total number of the remaining employees would then be clerical ?

.
22.5%
.
20.5%
.
25.2%
.
25%
✓ সঠিক উত্তর

ব্যাখ্যা

Of the 3600 employees of ABC Limited, 1/3 are clerical, so the number of clerical employees is = 3600×13 or 1200.
বিষয়: গণিতটপিক: শতকরা (Percentage)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৫

When heated an iron bar expands 0.2% . If the increased length is 1cm , what is the original length of the bar ?

.
500cm
✓ সঠিক উত্তর
.
5cm
.
0.97cm
.
1.97cm

ব্যাখ্যা

0.2% = 1cm
বিষয়: গণিতটপিক: শতকরা (Percentage)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৬

X is west of Y and Y is North of Z. M is south of X. Which direction is M to Z ?

.
West
✓ সঠিক উত্তর
.
South
.
North
.
East

ব্যাখ্যা

Solution:
বিষয়: গণিতরেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৭

Machine A produces bolts at a uniform rate of 120 every 40 seconds and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously , how many seconds will it take for them to produce a total of 200 bolts.

.
22
.
25
✓ সঠিক উত্তর
.
28
.
32

ব্যাখ্যা

In a second A Produces = 120 /40 = 3
বিষয়: গণিতরেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৮

Of a pole in a pound , 0.20 portions are in mud , 0.50 of it in water and the rest 6 feet is above water . What is the length of the pole ?

.
40 feet
.
35 feet
.
30 feet
.
25 feet

ব্যাখ্যা

1 - ( .2 + .5 ) = 1 - .7 = .3
বিষয়: গণিতটপিক: দশমিক-ভগ্নাংশ (Decimal Fraction)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
১৯

35% of Rifat's income is equal to 25% of Reaz's income . The ratio of their income is --

.
7 : 5
.
4 : 3
.
4 : 7
.
5 : 7
✓ সঠিক উত্তর

ব্যাখ্যা

Rifat = x
বিষয়: গণিতটপিক: অনুপাত-সমানুপাত (Ratio-Proportion)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010
২০

Shanto was asked to find the value of 7/12 of a sum of money.Instead of multiplying the same by 7/12, he divided it by 7/12 and his answer exceeded the correct answer by 95. The correct answer is -

.
48
.
89
.
84
.
69

ব্যাখ্যা

Let , Money = x
বিষয়: গণিতটপিক: ভগ্নাংশ (Fraction)রেফারেন্স: Bangladesh Bank - Assistant Director - 2010