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Preparation for the BCS

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BCS preparation part 1 ০১ . বর্তমানে বাংলাদেশে স্থলবন্দর কতটি ? উত্তরঃ ২১টি । [ সর্বশেষ স্থল বন্দর - শেওলা , সিলেট ] ০২ . কোন বছর আমেরিকার স্বাধীনতা ঘোষণা করা হয়েছিল ? উত্তরঃ ১৭৭৬ সালে । ০৩ . ২০১৫ সালের বিশ্ব খাদ্য পুরস্কার লাভ করে কোন বাংলাদেশী ? উত্তরঃ স্যার ফজলে হাসান আবেদ । ০৪ . বাংলাদেশে বিনিয়োগকারী সর্ববৃহৎ বিদেশী সংস্থা ' ইয়ংওয়ান ' কোন দেশের ? উত্তরঃ দক্ষিণ কোরিয়া । ০৫ . উইকিলিকস্ কোন দেশের রাজনৈতিক দল ? উত্তরঃ অস্ট্রেলিয়া । ০৬ . বসনিয়া সংকট সমাধান হয়েছিল কোন চুক্তির মাধ্যমে ? উত্তরঃ ডেটন চুক্তি । ০৭ . আল - জাজিয়া স্যাটেলাইট টেলিভিশনের প্রধান সম্প্রচার কেন্দ্র কোন দেশে অবস্থিত ? উত্তরঃ কাতারে । ০৮ . বিশ্বের কোন নগরটি দুটি মহাদেশে বিস্তৃত ? উত্তরঃ ইস্তাম্বুল । ০৯ . ' রাজবাড়ী ' জেলার পূর্ব নাম কি ছিল ? উত্তরঃ গোয়ালন্দ । ১০ . ' স্বপ্নাতুর কবি ' বলা হয় কাকে ? উত্তরঃ ইসমাইল হোসেন সিরাজী কে ।

Inventions

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By Md_Jamal_Molla






1.
Which insurance salesman invented the fountain pen in 1884?

A. Lewis Edson Waterman
B. Sir William Grove
C. Charles Kettering
D. George Fountain
Answer & Explanation
Answer: Option A

Explanation:

Lewis Edson Waterman patented the first practical fountain pen in 1884.


2.
When was the first elevator built?

A. 1743 B. 1739
C. 1760 D. 1785
Answer & Explanation
Answer: Option A

Explanation:

The first elevator was built in the palace of King Louis XV. It only traveled up one floor, and was hand powered by men inside the chimney.


3.
What charge card, developed in 1950, was the first to be accepted nationally in the US?

A. Visa B. Discover
C. MasterCharge D. Diner's Club
Answer & Explanation
Answer: Option D

Explanation:

The card was invented by Frank McNamara and Ralph Schneider.


4.
What Enrico Fermi invented?

A. X ray machine
B. Betatron
C. Cyclotron
D. Nuclear reactor
Answer & Explanation
Answer: Option D

Explanation:

Invented in 1942.

5.
Which of the following was first patented by an Australian in 1889?

A. Electric Drill
B. Electric Shaver
C. Electric Fence
D. Electric Heater
Answer & Explanation
Answer: Option A

Explanation:

The Electric Drill was the invention of Arthur James Arnot. On 20 August 1889 he patented his design while working for the Union Electric Company in Melbourne. His original design was meant primarily for drilling rock to find coal!

6.
Who among the following invented the small pox vaccine?

A. Robert Koch
B. Edward Jenner
C. Robert Hooke
D. Louis Pasteur

7.
What George Westinghouse invented?

A. Light bulb
B. Electric razor
C. Refrigerator
D. Railway air brakes
Answer & Explanation
Answer: Option D

Explanation:

Invented in 1868.


8.
Who is the only U.S. President to invent and patent something?

A. Abraham Lincoln
B. Theodore Roosevelt
C. Thomas Jefferson
D. Rutherford B. Hayes
Answer & Explanation
Answer: Option A

Explanation:

In 1849 Honest Abe invented a method to aid ships that got stuck on sandbars. He called it A Device for Buoying Vessels Over Shoals. It was never used.








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