Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

In lab, we found a metal element is solid when kept in a beaker, but melts as soon as you take it up on your palm. What metal is it possibly?

  1. Rhenium

  2. Gallium

  3. Selenium

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

Gallium has an unusually low melting point of approximately 30°C, just above typical room temperature (20-25°C). When placed on a human palm at body temperature (~37°C), it readily melts from solid to liquid. This property makes gallium a classic classroom demonstration metal.

Multiple choice general knowledge science & technology

In a massive dying star that form red supergiants, elements higher in atomic number than Hydrogen & Helium also starts fusion due to crushing pressure of the star's own gravitation & form elements of higher atomic number & it continues recursively. Which is the element that is formed last with the maximum atomic number this way & heavier atoms beyoond this are formed in trace amounts only?

  1. Iron

  2. Prometheum

  3. Barium

  4. Krypton
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In massive red supergiants, stellar nucleosynthesis progresses through successive fusion stages: hydrogen to helium, then to carbon, oxygen, neon, silicon, and finally iron. Iron (Fe-56) has the highest nuclear binding energy per nucleon, making fusion beyond iron endothermic rather than exothermic. Heavier elements are primarily formed during supernovae, not during the star's stable fusion phase.

Multiple choice general knowledge science & technology

Marie Curie was involved in discovery of which 2 radioactive metals?

  1. Plutonium, Radium

  2. Uranium, Radium

  3. Radon, Radium

  4. Polonium, Radium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Marie Curie and her husband Pierre discovered Polonium (named after Poland) in July 1898, and Radium in December 1898. They did not discover Uranium (discovered by Klaproth in 1789), Plutonium (discovered in 1940, after Curie's death), or Radon (discovered by Dorn in 1900).

Multiple choice general knowledge science & technology

Earth revolves around ……

  1. Moon

  2. Mars

  3. Venus

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

Earth revolves around the Sun in an elliptical orbit. This revolution takes approximately 365.25 days, which is why we have a leap year every four years. The Moon revolves around Earth, while Mars and Venus are other planets in our solar system.

Multiple choice general knowledge science & technology

Orange is full of ………

  1. Vitamin A

  2. Vitamin B

  3. Vitamin C

  4. Vitamin D
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oranges are an excellent source of Vitamin C, which is essential for immune function and skin health. One medium orange can provide over 100% of the daily recommended Vitamin C intake. Vitamin A is found in carrots, Vitamin D in fortified dairy, and Vitamin B in whole grains.