Q1. Who invented the first mechanical calculator in 1642?
Correct Answer: C
Blaise Pascal invented the mechanical calculator (Pascaline) in 1642 to help his father with tax calculations. It was one of the first mechanical calculators capable of addition and subtraction.
Q2. Who invented the first modern electrical air conditioning unit?
Correct Answer: C
Willis Carrier invented the first modern electrical air conditioning unit in 1902. His invention was originally designed to control humidity in a printing plant to improve print quality.
Q3. Willis Carrier invented the first air conditioner in which year?
Correct Answer: C
Willis Carrier developed his first air conditioning system (Apparatus for Treating Air) in 1902. It marked the beginning of modern air conditioning technology.
Q4. Who invented the world’s first atomic bomb for USA?
Correct Answer: A
J. Robert Oppenheimer was the scientific director of the Manhattan Project. While a team of scientists contributed, he is credited as the "father of the atomic bomb" for leading the project that developed the first nuclear weapons.
Q5. Who invented Airplane?
Correct Answer: D
The Wright Brothers (Orville and Wilbur) invented and flew the first successful powered airplane on December 17, 1903, near Kitty Hawk, North Carolina.
Q6. The Wright Brothers belonged to which country?
Correct Answer: D
The Wright Brothers were American. They were born in Dayton, Ohio, and conducted their famous flight in North Carolina.
Q7. The names of Wright Brothers were:
Correct Answer: C
The two brothers were Wilbur Wright (born 1867) and Orville Wright (born 1871). They worked together as a team to achieve powered flight.
Q8. Blood groups were first discovered by:
Correct Answer: B
Karl Landsteiner, an Austrian biologist and physician, discovered blood groups in 1901. He identified the ABO blood group system, which made safe blood transfusions possible.
Q9. ABO grouping of blood was discovered in by Karl Landsteiner.
Correct Answer: C
Karl Landsteiner discovered the ABO blood grouping system in 1901. This discovery earned him the Nobel Prize in Physiology or Medicine in 1930.
Q10. Who invented the ball point pen?
Correct Answer: A
Laszlo Biro, a Hungarian-Argentine journalist, invented the modern ballpoint pen in 1938. He was frustrated with fountain pens and created a pen using quick-drying ink and a rotating ball tip.
