Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Who created Kaleidoscopes?

  1. Garnet Carter

  2. Charles Darrow

  3. Sir David Brewster

  4. Percy Spencer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sir David Brewster invented the kaleidoscope in 1816. Garnet Carter created miniature golf, Charles Darrow developed Monopoly, and Percy Spencer invented the microwave oven. The kaleidoscope uses mirrors to create symmetrical patterns from colored objects.

Multiple choice general knowledge science & technology

Who created Metal Detector?

  1. Samuel Morse

  2. Alexander Graham Bell

  3. Douglas Engelbart

  4. Enrico Fermi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alexander Graham Bell invented the metal detector in 1881 to try to locate a bullet in President Garfield's body. Samuel Morse invented the telegraph, Douglas Engelbart developed the computer mouse, and Enrico Fermi was a nuclear physicist. The device used electromagnetic induction.

Multiple choice general knowledge science & technology

Who created Telegraph?

  1. Elizabeth Hazen

  2. Rachel Brown

  3. Paul Nipkow

  4. Samuel Morse
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Samuel Morse developed the telegraph and Morse code in the 1830s-1840s, revolutionizing long-distance communication. Elizabeth Hazen and Rachel Brown developed the first antifungal antibiotic, and Paul Nipkow invented the Nipkow disk for early television.

Multiple choice general knowledge science & technology

Who created Microwave Oven?

  1. James Naismith

  2. Percy Spencer

  3. Ellen Ochoa

  4. Dr Wilhelm Reich
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Percy Spencer accidentally discovered microwave heating technology in 1945 when a candy bar in his pocket melted near a magnetron. James Naismith invented basketball, Ellen Ochoa was an astronaut, and Wilhelm Reich was a psychoanalyst. The first microwave oven was sold in 1947.

Multiple choice general knowledge science & technology

What is sodium bicarbonate commonly known as?

  1. soda ash

  2. washing soda

  3. baking soda

  4. bitter salt
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium bicarbonate (NaHCO₃) is commonly known as baking soda, widely used in baking as a leavening agent. Washing soda is sodium carbonate (Na₂CO₃), soda ash is sodium carbonate's industrial name, and bitter salt typically refers to magnesium sulfate (Epsom salt).

Multiple choice general knowledge science & technology

When you buy a processor, you commonly encounter 1GHz, 2.6GHz, 800MHz, etc. What is it exactly?

  1. instructions per second

  2. Clock frequency

  3. Data transfer rate

  4. Throughput
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

GHz and MHz measure clock frequency - the number of clock cycles per second that a processor executes. This is NOT instructions per second (A), data transfer rate (C), or throughput (D). Clock speed determines how many operations a CPU can attempt per cycle.

Multiple choice general knowledge science & technology

Which of these actions will help keep your home the coolest in the summer

  1. opening and closing the refrigerator a lot

  2. turning off the tv, computer, radios, games, etc

  3. opening the windows during the day

  4. closing the shades or blinds over the windows
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Closing shades or blinds prevents direct sunlight from entering and heating up your home - this is the most effective option. Opening the refrigerator (A) actually adds heat to the room. Turning off electronics (B) helps minimally. Opening windows during hot day (C) lets heat in.

Multiple choice general knowledge science & technology

You see your reflection in a mirror because

  1. light is absorbed

  2. light is diffracted

  3. light is reflected

  4. light is refracted
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

You see your reflection in a mirror because light is reflected off the smooth surface at the same angle it arrives. Light is NOT absorbed (A - that would make the mirror appear black), diffracted (B - that spreads light in patterns), or refracted (D - that bends light through materials).