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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.
Who invented the BALLPOINT PEN?

A. Biro Brothers
B. Waterman Brothers
C. Bicc Brothers
D. Write Brothers
Answer & Explanation
Answer: Option A

Explanation:

The Hungarian brothers, Laszlo and George Biro, made the first ball point pen in 1894. It followed the first workable fountain pen which was invented by L.E. Waterman in 1884.


2.
In which decade was the first solid state integrated circuit demonstrated?

A. 1950s B. 1960s
C. 1970s D. 1980s
Answer & Explanation
Answer: Option A

Explanation:

On September 12, 1958, Jack Kilby demonstrated the first working IC while working for Texas Instruments, although the U.S. patent office awarded the first patent for an integrated circuit to Robert Noyce of Fairchild.


3.
What J. B. Dunlop invented?

A. Pneumatic rubber tire
B. Automobile wheel rim
C. Rubber boot
D. Model airplanes
Answer & Explanation
Answer: Option A

Explanation:

Invented in 1887.


4.
Which scientist discovered the radioactive element radium?

A. Isaac Newton
B. Albert Einstein
C. Benjamin Franklin
D. Marie Curie
Answer & Explanation
Answer: Option D


5.
When was barb wire patented?

A. 1874 B. 1840
C. 1895 D. 1900

6.
What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?

A. Charles Richter
B. Hiram Walker
C. Giuseppe Mercalli
D. Joshua Rumble
Answer & Explanation
Answer: Option A

Explanation:

Richter was born on an Ohio farm in 1900. He died in 1985.


7.
What Galileo invented?

A. Barometer
B. Pendulum clock
C. Microscope
D. Thermometer
Answer & Explanation
Answer: Option D

Explanation:

Various authors have credited the invention of the thermometer to Cornelius Drebbel, Robert Fludd, Galileo Galilei or Santorio Santorio. The thermometer was not a single invention, however, but a development.

Galileo Galilei also discovered that objects (glass spheres filled with aqueous alcohol) of slightly different densities would rise and fall, which is nowadays the principle of the Galileo thermometer (shown). Today such thermometers are calibrated to a temperature scale.

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8.
This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

A. George Washington
B. Alexander Hamilton
C. John Adams
D. Thomas Jefferson
Answer & Explanation
Answer: Option D

Explanation:

Thomas Jefferson (April 13, 1743 - July 4, 1826) was the third President of the United States (1801-1809) and the principal author of the Declaration of Independence (1776).
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