h who long does it take them meet.

A. 5 hours
B. 3 hours
C. 2.5 hours
D. 6 hours

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Answer: Option C

Explanation:

জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা-(NSI) Assistant Director- Research officer &amp- Assistant Programmer-০৮/১০/২০২১

A. There has been a slowdown in the rate of increase in world demand for coal over the last 5 years from 10% to 5%
B. It has been known for many years that there are vast stocks of coal under Antarctica which have yet to be economically exploited
C. Oil is being used increasingly in place of coal for many industrial and domestic uses
D. As coal resources are depleted more and marginal supplies , which are more costly to produce and less efficient in use , are being mined
E. Industries are increasingly using fossil fuels, now a days , as the new reserves of such energy have been discovered

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Answer: Option E

Explanation:

To weaken the statement that the world's coal reserves will be exhausted by 2050, given the continued growth in demand, we need to find an option that presents a contrary or mitigating factor. Let's analyze the options provided:

A. There has been a slowdown in the rate of increase in world demand for coal over the last 5 years from 10% to 5%.
This option weakens the statement because a slower rate of increase in demand implies that the depletion of coal reserves may not occur as quickly as predicted. It suggests that demand growth is slowing down, which could extend the lifespan of coal reserves beyond 2050.

B. It has been known for many years that there are vast stocks of coal under Antarctica which have yet to be economically exploited.
This option weakens the statement because the existence of untapped coal reserves under Antarctica suggests that there are additional resources available. If these reserves become economically viable to exploit, it could significantly extend the lifespan of coal reserves beyond 2050.

C. Oil is being used increasingly in place of coal for many industrial and domestic uses.
This option weakens the statement because the increasing use of oil as a substitute for coal indicates a potential decrease in demand for coal. If industries and households are shifting to oil, it could reduce the rate of coal consumption and extend the lifespan of coal reserves.

D. As coal resources are depleted, more marginal supplies, which are more costly to produce and less efficient in use, are being mined.
This option supports the statement rather than weakening it. It suggests that as easily accessible and higher-quality coal resources are depleted, the remaining supplies become more expensive to produce and less efficient in use. This implies that the depletion of coal reserves may be accelerating.

E. Industries are increasingly using fossil fuels nowadays as new reserves of such energy have been discovered.
This option does not directly weaken the statement. While industries are using more fossil fuels, it does not specify whether coal specifically is being used more. Without information about the specific use of coal, it does not provide a clear contrary factor to the depletion of coal reserves.

Based on the analysis, the option that weakens the statement the most is option A: There has been a slowdown in the rate of increase in world demand for coal over the last 5 years from 10% to 5%. It suggests a potential decrease in demand growth, which could extend the lifespan of coal reserves beyond 2050.

Bangladesh Bank - Assistant Director - 2011

A. 14
B. 12
C. 11
D. 10
E. None of these

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Answer: Option E

Explanation:

55% of 12/66 of 270 = 55/100 x 12/66 x 270 = 27

469 . What is the approximate growth of sales of B5 ?

A. 18%
B. 21%
C. 23%
D. 27%
E. 31%

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Answer: Option D

Explanation:

The difference value of salse of B5 = 95 - 75 = 20

Approximately growth of salse of B5 = 20/75×100% = 26.67% = 27%

Bangladesh Bank - Assistant Director - 2013 ||

A. 73
B. 80
C. 83
D. 88
E. 90

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Answer: Option B

Explanation:

Total salse 2011 = 80 + 75 + 95 + 85 + 75 + 70 = 480 thousand

Average sales in 2011 = 480/6 = 80 thousand

correct answer : 80

Bangladesh Bank - Assistant Director - 2013 ||

A. 1/2
B. 6/7
C. 32/525
D. 7/6

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Answer: Option B

Explanation:

472 . what is the Cartesian product of A ={ 1,2} and B = { a,b } ?

A. {(1,a),(1,b)(2,a)(b,b)}
B. {(1,1),(2,2),(a,a),(b,b)}
C. {(1,a),(2,a), (1,b), (2,b)}
D. {(1,1),(a,a),(2,a),(1,b)}

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Answer: Option C

Explanation:

Assit. Programmer | Sonali Bank- Rubali Bank- BD Krishi Bank - 16.11.2018

A. 15
B. 16
C. 17
D. 18
E. 19

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Answer: Option B

Explanation:

Bangladesh Bank - Assistant Director - 2011

A. 93
B. 63
C. 123
D. 113
E. None

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Answer: Option E

Explanation:

475 . What is the prime factorization of 84?

A. 42 × 2
B. 2 × 2 × 4 × 6
C. 2 × 7 × 6
D. 2 × 2 × 3 × 7

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Answer: Option D

Explanation:

476 . What is the probability that the product of two integers ( not necessarily different integers ) randomly selected from the numbers 1 through 20, inclusive , is odd ?

A. 2/3
B. 1/4
C. 1/2
D. 3/4
E. None of them

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Answer: Option B

Explanation:

Total integers; 20
even = odd = 10
Since odd x odd = odd and since half the integers 1 to 20 are odd, the probability of selecting two odd integers is 1/2 x 1/2 = 1/4.

Bangladesh Bank - Assistant Director - 2012

A. 5/36
B. 7/36
C. 2/3
D. 1/36

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Answer: Option A

Explanation:

জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা-(NSI) Assistant Director- Research officer &amp- Assistant Programmer-০৮/১০/২০২১

A. 1/3
B. 1/4
C. 4/9
D. 9/4

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Answer: Option B

Explanation:

Senior Officer (IT) - Sonali-Janata-BD Krishi-BD Development Bank Ltd - 30.11.2018

A. 2:3
B. 3:5
C. 4:5
D. 7:9
E. 1:1

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Answer: Option D

Explanation:

Bangladesh Bank - Assistant Director - 2013 ||

A. -2
B. -0.5
C. 1
D. 2
E. 3

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Answer: Option A

Explanation:

Slope of the line = 3 - ( - 3) / 1 - 4 = - 2

Bangladesh Bank - Assistant Director - 2011

466 . Two truck 300 km away are travelling towards is other witha constant speed. Truck A is moving at a average speed 70 km/h while truck B is moving at average speed 50 km/h who long does it take them meet.

467 . Unless the new reserves are found soon, the world's supply of coal is being depleted in such a way that with demand continuing to grow at present rates, reserves will be exhausted by the year 2050. Which of the following , if true , will weaken he above a

468 . What is 55% of 12/66 of 270?

469 . What is the approximate growth of sales of B5 ?

470 . What is the average sales of all the branches (in thousands) for the year 2011 ?

471 . What is the best possible result for the problem 8/35÷4/15=?

472 . what is the Cartesian product of A ={ 1,2} and B = { a,b } ?

473 . What is the missing number in the following series ? 1, 4, 9, ?, 25

474 . What is the next number in the series 1, 11, 27, 57, ...

475 . What is the prime factorization of 84?

476 . What is the probability that the product of two integers ( not necessarily different integers ) randomly selected from the numbers 1 through 20, inclusive , is odd ?

477 . What is the propability of getting a sum of six if two dices are thrown at once?

478 . what is the ratio of 3/4 to the product 4 (3/4)?

479 . What is the ratio of the total sales of branch B2 for both years to the total sales of branch B4 for both years ?

480 . What is the slope of the line that contains the points ( 1, 3 ) and ( 4, -3 ) ?

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