৪৫তম বিসিএস, প্রাইমারি শিক্ষক নিয়োগ, সরকারি চাকরি, ব্যাংক প্রস্তুতি

চবি এ (1756 টি প্রশ্ন )

Passage :

Read the following passage and answer the question For thousands of years, agriculture was practiced without utilizing any artificial chemicals, such as artificial fertilizers and pesticides. The first generation of artificial fertilizers was developed during the mid-19th century. Being cheap, powerful and easy to transport in bulk, these fertilizers soon became popular amongst the farmers all around the world. In addition, similar advances in chemical pesticides in 1940s, turned farming into a very fruitful business. However, after nearly a few decades, the studies revealed that both artificial fertilizers and pesticides had serious long term side effects including soil compaction, erosion, and reduction in soil fertility.Furthermore, scientists were concerned about toxic chemicals entering the food supply and endangering human health Due to the above mentioned problems, organic farming as, an alternative to current methods, gained a lot of attention in academic circles and soon became a widely used farming approach. For one thing, organic farming excluded the use of synthetic pesticides, growth hormones, antibiotics, genetically modified seeds and animal breeds, as well as irrigation. Instead of artificial materials, organic farming relies on ecosystem management; meaning that even pesticides and fertilizers are derived from plants, animal wastes, and minerals. The primary aim of this method is to increase soil fertility, balance insect population, and reduce air, soil, and water pollution. Also from consumers' hers' perspective, this method is absolutely fruitful in terms of health-related issues.

Q1. what long term effects of artificial materials in farming were mentioned in the passage?

ক) making the soil infertile and poisonous

খ) making less delicious fruits and crops

গ) affecting the ecosystem and animals living there

ঘ) Gradual destruction of soil and decreasing its fertillity

ব্যাখ্যা (Explanation):

Q2. which statement is not correct according to the passage?

ক) Artificial fertillizers were first introduced in the first half of the 20th century

খ) Artificial fertillizers and pesticides were not consumed in traditional methods of farming

গ) throughtout the history artificial fertillizers and pesticides have always been used in agriculture

ঘ) chemical fertillizers developed before artificial pesticides

ব্যাখ্যা (Explanation):

Q3. The scientists were concerned about the chemical pesticides with respect to human health because they could--

ক) potentially affect the next generation

খ) easily jeopardize human's health by entering the food supply

গ) affect the farmers but not people

ঘ) produce all kinds of gases

ব্যাখ্যা (Explanation):

Q4. The main difference between organic farming and other forms is that organic farming-

ক) pays more attention to insects balance

খ) can be done in nearly all places in the world

গ) mainly focuses on eco-system management

ঘ) produces much more compared to other methods

ব্যাখ্যা (Explanation):

Passage :

Read the following passage and answer the questions: In recent years, scientific and technological developments have drastically changed human life on our planet, as well as our views both of ourselves as individuals in society and of the universe as a whole. Perhaps one of the most profound developments ofthe 1970s was the discovery of recombinant DNA technology, which allows scientists to introduce genetic material (or genes) from one organism into another. In its simplest form, the technology requires the isolation of a piece of DNA, either directly from the DNA of the organism under study or artificially synthesized from an RNA template by using a viral enzyme called reverse transcriptase. This piece of DNA is then ligated to a fragment of bacterial DNA which has the capacity to replicate itself independently. This recombinant molecule thus produced can be introduced into the common intestinal bacterium Escherichia coli, which can be grown in very large amounts in synthetic media. Under proper conditions, the foreign gene will not only replicate in the bacteria, but also express itself, through the process of transcription and translation, to give rise to large amounts of the specific protein coded by the foreign gene.

Q5. the word "replicate"is closest in meaning to-

ক) reproduce

খ) join

গ) reside

ঘ) coexist

ব্যাখ্যা (Explanation):

Q6. The term "recombinant" is used because-

ক) by ligation,a recombinant molecule is produced, which has the capacity of replication

খ) the technique requires the combination of several types of technology

গ) by ligation , a recombinant protein is produced, part of whole amino acids come from each different organism

ঘ) Escherichia coli is a recombinant organism

ব্যাখ্যা (Explanation):

Q7. Expression of a gene in Escherichia coli requires-

ক) the viral enzyme reverse transcriptase

খ) the process of transcription and translation

গ) production of insulin and other biomolecules

ঘ) that the bacteria be grown in synthetic media

ব্যাখ্যা (Explanation):

Q8. The word "fragment" is nearest in meaning to-

ক) particle

খ) reproduction

গ) opposite

ঘ) large piece

ব্যাখ্যা (Explanation):

Q9. which of the following is not true?

ক) the foreign gane will replicate in the bacteria , but it will not express it self through transacription and translation

খ) the bacterium Escherichia coli can be grown in large amounts in synthetic media

গ) research continues in an effort to find other uses for this technology

ঘ) recombinant DNA technology is a recent development

ব্যাখ্যা (Explanation):

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

Install App

Q10. "Artificially" is closest in meaning to-

ক) correctly

খ) synthetically

গ) artistically

ঘ) carefully

ব্যাখ্যা (Explanation):

Q11. recombinant DNA technology has been used in the production of all of the following biomolecules except-

ক) growth hormones

খ) Escherichia coli

গ) interferon

ঘ) insulin

ব্যাখ্যা (Explanation):

Q12. The word "isolation is closest in meaning to-

ক) destruction

খ) duplication

গ) segregation

ঘ) study

ব্যাখ্যা (Explanation):

Q13. The word "profound" is closest in meaning to-

ক) significant

খ) boring

গ) dangerous

ঘ) secret

ব্যাখ্যা (Explanation):

Q14. \( \lim_{x \to 0} \frac{\cos 2x - \cos 3x}{x^2}=? \)

ক) \( \frac{1}{5} \)

খ) \( \frac{5}{2} \)

গ) \( \frac{5}{4} \)

ঘ) 0

Q15. \( \frac{d}{dx}\left[\tan^{-1}(\cot x) + \cot^{-1}(\tan x)\right]=? \)

ক) 0

খ) 1

গ) 2

ঘ) -2

Q16. \( \frac{\sin A}{1+\cos A} + \frac{\cos A}{\sin A} \) এর মান কত?

ক) cosec A

খ) cot A

গ) tan A

ঘ) sec A

Q17. \( f(x) = |3x - 7| \) এর ডোমেন এবং রেঞ্জ কত?

ক) \( \mathbb{R} \) ; \( \mathbb{R} \)

খ) \( (0, \infty) \) ; \( [\frac{7}{3}, \infty) \)

গ) \( [0, \infty) \) ; \( [\frac{3}{7}, \infty) \)

ঘ) \( \mathbb{R} \) ; \( [0, \infty) \)

Q18. একজন লোকের 7 জন বন্ধু আছে। লোকটি তার এক বা একাধিক বন্ধুকে দাওয়াত করতে পারার উপায় কয়টি?

ক) 7

খ) 127

গ) 128

ঘ) 130

Q19. x² +y² – 6y + 5 = 0 বৃত্তে x = 2 সরলরেখাটি একটি-

ক) ব্যাসার্ধ

খ) ব্যাস

গ) জ্যা

ঘ) স্পর্শক

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

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Q20. k এর যে মানের জন্য (k – 1)x + (k +1)x = -7 এবং 7x + 9y = 0 সরলরেখাদ্বয় সমান্তরাল হবে তা হল-

ক) 7

খ) 8

গ) -7

ঘ) 9

Q21. মূলবিন্দুগামী এবং x- অক্ষের ধনাত্মক দিকের সাথে 60° কোণ উৎপন্নকারী সরলরেখার সমীকরণ

ক) \( \sqrt{3}x - y = 0 \)

খ) \( \sqrt{3}y-x = 0 \)

গ) \( y + \sqrt{3}x = 0 \)

ঘ) \( \sqrt{3}y + x = 0 \) .

Q22. যদি \( \vec{x} = 2\hat{i} + 4\hat{j} - 6\hat{k} \) , \( \vec{y} = 3\hat{i} + 5\hat{j} - 7\hat{k} \) হয়, তবে \( \vec{y} \) ভেক্টরের উপর \( \vec{x} \) ভেক্টরের স্কেলার অভিক্ষেপ কত?

ক) \( \frac{68}{\sqrt{83}} \)

খ) - \( \frac{68}{\sqrt{83}} \)

গ) \( \frac{68}{83} \)

ঘ) - \( \frac{68}{83} \)

Q23. \( A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix} \) , \( B = \begin{bmatrix} 1 & 4 & 7 \\ 2 & 5 & 6 \end{bmatrix} \) , \( C = \begin{bmatrix} 1 \\ 2 \\ 3 \end{bmatrix} \) হলে (AB)C ম্যাট্রিক্সের মাত্রা হবে-

ক) \( 2 \times 1 \)

খ) \( 2 \times 3 \)

গ) \( 3 \times 1 \)

ঘ) \( 3 \times 2 \)

Q24. kx² + 8x + (k + 2) = 0 এর মূলদ্বয়ের যোগফল ও গুণফল সমান হলে k এর মান হবে-

ক) 10

খ) -10

গ) 6

ঘ) -6

Q25. 3N ও 5N মানের দুইটি বল এক বিন্দুতে পরস্পর বিপরীত দিকে ক্রিয়া করে। তাদের লব্ধির মান হবে-

ক) 2N

খ) 8N

গ) 10 N

ঘ) 12 N

Q26. \( y = \frac{1}{x} \) হলে \( y \) এর 18 তম অন্তরীকরণ কোনটি?

ক) \( \frac{18!}{x^{19}} \)

খ) \( \frac{19!}{x^{20}} \)

গ) \( \frac{18!}{x^{18}} \)

ঘ) কোনটিই নয়

Q27. যদি 5y = x + 50 রেখাটি \( y^2 = 4ax \) পরাবৃত্তের একটি স্পর্শক হয়, তবে তার ফোকাস হবে-

ক) (1,0)

খ) (2,0)

গ) (5, 0)

ঘ) (10, 0)

Q28. একটি ট্রেন অচল অবস্থা হতে 5 m/sec² ত্বরণে চলতে শুরু করার পর ঘন্টায় 72 km বেগ প্রাপ্ত হতে কত সময় লাগবে?

ক) 2 sec

খ) 3 sec

গ) 4 sec

ঘ) 5 sec

Q29. \( px^2 - 4x + 3 = 0 \) সমীকরণে \( p \) এর মান কত হলে, মূল দুটি জটিল হবে?

ক) \( p \geq \frac{4}{3} \)

খ) \( p > \frac{4}{3} \)

গ) \( p < \frac{4}{3} \)

ঘ) \( p \leq \frac{4}{3} \)

এখানে প্রথম ৩০টি প্রশ্নের ব্যাখ্যা দেখতে পারবেন, বাকি সব প্রশ্নের সম্পূর্ণ ব্যাখ্যা পেতে এখনই অ্যাপ ইন্সটল করুন।

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Q30. \( (3x^2 - \frac{1}{x})^{14} \) এর বিস্তৃতিতে কততম পদে \( x^{10} \) পাওয়া যাবে?

ক) 5 তম

খ) 6 তম

গ) 7 তম

ঘ) 8 তম

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চবি এ (1756 টি প্রশ্ন )