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Question - 1 : Choose the correct alternative and marks its letter on your answer sheet. The rich should not look down- the poor.

a) upon

b) towards

c) for

d) at

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Question - 2 : মেক্সিকো ও যুক্তরাষ্ট্র বিভক্তকারী সীমারেখা কোনটি ?

a) ম্যাকনামারা লাইন

b) সনোরা লাইন

c) ডুরান্ড লাইন

d) হিন্ডারবার্গ লাইন

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Question - 3 : আধুনিক অলিম্পিকের প্রবতক বা জনক ?

a) ব্যরন পিয়ারে দ্যা কুবার্তা

b) বেডেন পাওয়েল

c) প্যারেজ দ্যা কুইলার

d) জুয়ান এন্টোনিও সামারাঞ্চ

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Question - 4 : ‘শ্রদ্ধা’ শব্দের সঠিক প্রকৃতি-প্রত্যয় কোনটি ?

a) শ্র+∙ধা+ আ

b) শ্রৎ+ ∙ধা+আ

c) শ্রৎ+∙ধা+অ+আ

d) শ্রু+∙ধা+আ

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Question - 5 : কোন পত্রিকাটি ১৯২৩ সালে প্রকাশিত হয়?

a) কালিকলম

b) প্রগতি

c) কল্লোল

d) সবুজপত্র

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Question - 6 : কাজী নজরুল ইসলামের উপন্যাস কোনটি ?

a) আলেয়া

b) মৃত্যুক্ষুধা

c) ঝিলিমিলি

d) মধুবালা

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Question - 7 : বাংলাদেশের নদী গবেষণা ইনস্টিটিউট কোথায় ?

a) নারায়ণগঞ্জ

b) চট্রগ্রাম

c) চাঁদপুর

d) ফরিদপুর

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Question - 8 : আপনি কি আমাকে সাহায্য করতে পারবেন?

a) Could you help me?

b) Can you help me?

c) You can help me?

d) Could you help to me?

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Question - 9 : The word 'Ecological' is related to-

a) Atmosphere

b) Pollusion

c) Environment

d) Demography

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Question - 10 : আমি কি কিছু বলতে পারি?

a) I can say something?

b) Can I say something?

c) Can I say something too?

d) Can I say something too?

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How about we Build Cars Out of Batteries

In the event that batteries could make up the very structure of our vehicles and gadgets, those items would be far lighter and increasingly effective

 Carbon fiber is essentially utilized for its light weight, and prized for its quality and solidness. In any case, when Leif Asp takes a gander at the material, he sees a chance to cause it to carry out twofold responsibility in a manner that could radically improve the effectiveness of vehicles and planes.

 "The battery is a basic parasite," says the architect and educator at the Chalmers University of Technology in Sweden, which means it includes weight and saps proficiency, without adding to the physical quality and structure of the vehicle that it's fueling. In any case, consider the possibility that the vehicles were worked out of batteries.

 That is the place Asp is truly going with this innovation. He needs to see autos, planes, pontoons, even smartwatches and other shopper gadgets made of a material that demonstrations both as the body and the vitality source—something known as a "basic battery." A vehicle joining auxiliary batteries could weigh up to 50 percent not exactly a normal EV that has overwhelming lithium particle batteries stuffed underneath it, says Asp.

 It's not news that carbon fiber has electrochemical properties. Like graphite, the material is, in specific setups, equipped for conductivity. Specialists from the Chalmers University of Technology have applied for a U.S. patent on a battery produced using carbon fiber, however putting up one for sale to the public has demonstrated dubious for the modest number of individuals concentrating the thought. New research from Asp's group has distinguished a specific part of the material that makes its latent capacity use as auxiliary batteries much increasingly practical.

 All carbon isn't made equivalent, in any case, and various sorts of carbon have various properties that make them appropriate to various employments. Asp will probably comprehend what carries on how, and why, and apply that to basic applications.

 "The carbon strands that are accessible available, they have been made for auxiliary applications or made for electrical applications," he says. Basic applications are what we're generally acquainted with, from the carbon that makes up bikes and other solid, lightweight items, however electrical parts are once in a while made of the material as well, but an alternate kind. He accepts carbon can do both.

 In their most recent research, Asp and his partners looked at three composites and analyzed them through electron microscopy and laser spectroscopy. They incorporated the fiber with batteries, took a gander at the size and direction of the precious stones of carbon particles reinforced together in them, and thought about the solidness, quality and electrochemical properties of the various materials. Littler gems, with increasingly muddled structure, will in general be all the more electrochemically responsive — that is, they are progressively ready to take up, store and discharge electrons, and accordingly go about as batteries. In any case, these sorts of carbon are less firm than those with precious stones that are longer and arranged. (In any case, they're exceptionally little; Asp contrasted fiber with precious stones from 18 with 28 angstroms to gems from 100 to 300 angstroms, and an angstrom is one ten billionth of a meter.)

The scientists' vision is of vehicles where a huge piece of the vehicle body or plane fuselage comprises of auxiliary lithium particle batteries. (Yen Strandqvist, Chalmers University of Technology)

 Utilizing a carbon fiber that forfeits some solidness to accomplish better conductivity may not be an issue, in light of the fact that the material was as yet stiffer than steel, and equipped for conveying a basic burden. It likewise won't hold a charge as proficiently as customary batteries, yet at that point, if a large portion of the vehicle is comprised of the stuff, it won't need to in light of the fact that the general productivity will at present be incredibly expanded. Industry accomplices like Airbus, which has been working with Asp since 2015, allude to this as "mass-less vitality stockpiling."

 All things considered, it's innovation that is far from being handy — possibly decades, says Adrian Mouritz, official senior member of the school of designing at RMIT University in Melbourne. Mouritz likewise takes a shot at basic vitality stockpiling utilizing carbon fiber, however his work inserts lithium particle batteries inside sandwiches of carbon, conveying a portion of the basic burden and lessening the dead weight of batteries, however not as widely as Asp's adaptation.

 "The methodology we're taking, the composite material is as of now demonstrated, the battery itself is as of now demonstrated. All we're attempting to demonstrate is the combination of the battery into the composite, which is an a lot littler advance to take," says Mouritz. "Leif's is … all the more actually mind boggling, however its advantages in the more drawn out term will be more grounded. It still just requires much more innovative work to advance the materials and plan of the genuine framework."

 "For this to fly, obviously, would be quite a while away," says Asp. He is working with Airbus to create a demo, for discharge one year from now, which replaces inside lights and links with auxiliary carbon fiber. Despite the fact that the more noteworthy weight investment funds could be in wiping out the requirement for fuel, which Mouritz says represents 33% or a greater amount of an aircraft's working spending plan, the Airbus demo will be a delineation that the innovation is reasonable.

 Mouritz sees the innovation being applied to extravagance cars and Formula 1 racecars first, and wide selection in the buyer showcase once the value descends and the dependability is affirmed. "In the event that you can lightweight your air ship, on the off chance that you can lightweight your car, the real net cost investment funds of this is in the many millions if not in the billions of dollars," he says.