Bangladesh Krishi Bank 2012 (Sr. Officer))

৯৮ টি প্রশ্ন

একই বিষয়ের সব টপিক

At a party, everyone must shake the hand of the other. If the total number of handshakes is 66, there are — people at the party?

ক) 18 খ) 9 গ) 12 ঘ) 15

ব্যাখ্যা (Explanation)

Let the number of persons= n

Number of handshakes by first person= n- 1

(As he cannot handshake with himself)

Number of handshakes by second person = n- 2

(As he has already handshaked with first person)

Number of handshakes by third person= n- 3

Number of handshakes by second last i.e. ( n- 1)th person= n- (n- 1)= 1

Number of handshakes by last i.e. nth person= n- n= 0

So,

Total number of handshakes=(n- 1)+ (n- 2)+ (n- 3)+ 1+ 0

= 0+ 1+ 2+ 3+ ...........(n- 1)

= Sum of first (n- 1) terms

= (n- 1)(n- 1+ 1)/2

= n(n- 1)/ 2

So, Total number of handshakes= n(n- 1)/2

According to question,

n(n- 1)/ 2= 66

=> n^2 - n= 132

=> n^2- n- 132= 0

=> n^2- 12n+ 11n- 132= 0

=> n(n- 12) + 11(n- 12)= 0

=> (n- 12)(n+ 11) = 0

n= 12 or n= - 11(which is not possible as no. Of persons cannot be negat

Which sector contributes the most to Bangladesh GDP?

ক) Agriculture খ) Industry গ) Service ঘ) External Sector

ব্যাখ্যা (Explanation)

GDP by sector Services: 53.39%; Agriculture: 15.33% Industry: 31.28% (FY 2015-16)

The old name of Switzerland is

ক) Helvetia খ) Rhodesia গ) Deutschland ঘ) Salisbury

The tribal sector known as ‘Garo’ is mostly concentrated in which district of Bangladesh?

ক) Sylhet খ) Rangamati গ) Mymensimgh ঘ) Bandarban

On a test consisting of 80 questions, Nasir answered 75% of the first 60 questions correctly. What percent of the other 20 questions does the need to answer correctly for his grade on the entire examination to be 80%?

ক) 85% খ) 90% গ) 95% ঘ) 100%

ব্যাখ্যা (Explanation)

To solve this problem, we can break it down step by step:

1. First, find 80% of 80:
80% of 80 = (80 * 80) / 100 = 64

2. Next, calculate how many questions the person needs to answer correctly to achieve a total of 64 questions. Since they answered 75% of 60 questions correctly, we can calculate the number of correct answers:
(75/100) * 60 = 45 questions answered correctly.

3. Now, calculate the remaining questions they need to answer correctly to reach a total of 64 questions:
64 - 45 = 19 questions

4. Finally, calculate the percentage of questions they need to answer correctly out of the remaining 20 questions to achieve 95%:
(19/20) * 100 = 95%

So, the person needs to answer 19 out of the remaining 20 questions correctly to achieve a total of 64 questions and a 95% success rate.

The population of a country doubled every 10 years from 1960 to What was the percent increase in population during this time?

ক) 200% খ) 300% গ) 700% ঘ) 800%

ব্যাখ্যা (Explanation)

1990-1960=30 years if in the first 10 years ,the population was x,then after 30 years it would be =x+2x+3x=7x so, increase=7x/x X 100%=700%

At 3 A.M. the temperature was 13° below zero. By noon, it had risen to 32°. What was the average hourly increase in temperature?

ক) (19/9)° খ) (19/6)° গ) 5° ঘ) 7.5°

ব্যাখ্যা (Explanation)

Total Difference = 32 - (-13) = 45

Average hourly increase = 45/9=5

On a certain French-American committee, 2/3 of the members are men, and 3/8 of the men are Americans. If 3/5 of the committee members are French, what fraction of the members are American women?

ক) 2/5 খ) 3/4 গ) 3/20 ঘ) 2/15

ব্যাখ্যা (Explanation)

American man=3/8 x 2/3 =1/4 of all member All American member=(1- 3/5)=2/5 so American woman=(2/5-1/4)=3/20

A researcher computed the mean, the median and the standard deviation for a set of performance scores. If 5 were to be added to each score, which of these three statistics would change?

ক) The mean only খ) The median only গ) The standard deviation only ঘ) The mean and the median

ব্যাখ্যা (Explanation)

If we add or subtract a constant to each term in a set the standard deviation will not change.. If we add (or subtract) a constant to each term in a set the mean and the median will increase (decrease) by the value of that constant.

প্রথম ৩০টি প্রশ্নের ব্যাখ্যা ওয়েবসাইটে; সবগুলোর সম্পূর্ণ ব্যাখ্যা পেতে অ্যাপ ইন্সটল করুন।

অ্যাপ ইন্সটল করুন

Five ships- J, K, L, M, and N- are to be unloaded on five consecutive days beginning on Monday and ending on Friday according to the following conditions:

*Each ship takes exactly one day to unload.

*K must be unloaded on a day preceding the days M and N are unloaded

*L cannot be unloaded on a Tuesday

*M must be the second ship unloaded after J is unloaded. If J is unloaded on Monday, which of the following must be true?

ক) L is unloaded before K খ) L is unloaded before M গ) K is unloaded on Tuesday ঘ) L is unloaded on Thursday.

Let A be the set of primes less than 6, and B be the set of positive odd numbers less than How many different sums of the form a + b are possible, if a is in A and b is in B?

ক) 6 খ) 7 গ) 8 ঘ) 9

ব্যাখ্যা (Explanation)

A= { 2, 3, 5} and B= {1, 3, 5} . Any of the 3 numbers in A could be added to nay of the 3 numbers in B, so 9 sums could be formed. However, there could be some duplication. List the sums systematically; first add 1 to each number in A, then 3, and then 5: 3, 4, 6; 5, 6(x), 10; 7, 8, 10(x). there are 7 different sums

which of the following is the value of √(000064)³

ক) 0.004 খ) 0.008 গ) 0.02 ঘ) 0.2

What is the area of an equilateral triangle whose sides are 10?

ক) 30 খ) 25√3 গ) 50 ঘ) 25√2

ব্যাখ্যা (Explanation)

area of equilateral triangle=√3/4 a2 =√3/4 x(10)2 =25√3

If the angles of a five-sided polygon are in the ratio of 2:3:3:5:5, what is the measure of the shortest angle?

ক) 20 খ) 40 গ) 6 ঘ) 80

ব্যাখ্যা (Explanation)

here, 2x+3x+3x+5x+5x=180 18x=180 x=10 2x=20

If A is the area and C the circumference of a circle, which of the following is an expression for A in terms of C?

ক) c2/4π খ) c2/4π2 গ) 2c ঘ) 2c2 √π

ব্যাখ্যা (Explanation)

a=4πr2 c=2 πr r=c/2 π now,a=4πr2 =π x ( c/2 π)2 = c2/4π

Avi drove from his home to college at 60 miles per hour. Returning over the same rout, there was a lot of traffic, and he was only able to drive at 40 miles per hour. If the return trip took 1 hour longer, how many miles did ne drive each way?

ক) 3 খ) 5 গ) 120 ঘ) 240

ব্যাখ্যা (Explanation)

suppose, he had drove x mile each way at time of going, he went 60 mile in 1 hour he went 1 mile in 1/60 hour he went x mile in x/60 hour at time of returning, he went 40 mile in 1 hour

If x is positive, and y = 5×² + 3, which of the following is an expression for x in terms of y?

ক) √(y/5 -3) খ) √{(y-3)/5 } গ) √(y-3)/5 ঘ) √y/5

ব্যাখ্যা (Explanation)

y = 5×2 + 3 x2=y-3/5 x=√{(y-3)/5 }

A hospital has enough pills on hand to treat 10 patients for 14 days. How long will the pills last if there are 35 patients?

ক) 7 days খ) 6 days গ) 5 days ঘ) 4 days

ব্যাখ্যা (Explanation)

10 patients last for 14 days 1 patients last for 10 x 14 days 35 patients last for 10 x 14/35=4 days

In January, the value of a stock increased by 25% and in February, it decreased by 20%. How did the value of the stock at the end of February compare with its value at the beginning of January?

ক) It was less খ) It was the same গ) It was 5% greater ঘ) It cannot be determined from the information give

ব্যাখ্যা (Explanation)

The value after 25% increase is tk 125 from tk 100 At 20% decrease, If 100 is the original than the new value is tk 80 if 1 is the original than the new value is 80/100 If 125 is the original than the new value is tk 80 x125/100 =100 tk