Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

The mean of a data set is equal to 10 and its standard deviation is equal to 1. If we add 5 to each data value, then the mean and standard deviation become

  1. mean = 15 , standard deviation = 6

  2. mean = 10 , standard deviation = 6

  3. mean = 15 , standard deviation = 1

  4. mean = 10 , standard deviation = 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adding a constant to every data value increases the mean by that constant but does not change the spread. New mean = 10 + 5 = 15. Standard deviation remains 1 because adding a constant shifts all values equally without changing their dispersion.

Multiple choice general knowledge science & technology

What is cosidered as one unit of power consumption?

  1. One Kilowatt power consumed in 1 Hr

  2. One Watt power consumed in 1 Hr

  3. One Megawatt power consumed in 1 Hr

  4. One Amperes of current consumed in one second
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

One unit of electricity is defined as one kilowatt-hour (kWh), which means using 1 kilowatt (1000 watts) of power for 1 hour. This is the standard unit for billing residential electricity consumption worldwide.

Multiple choice general knowledge science & technology

Which is not there in Cycles?

  1. Spring

  2. Flywheel

  3. Gears

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

Bicycles don't have flywheels. They have gears, bearings, and sometimes springs (in suspension), but a flywheel is a heavy rotating wheel used to store rotational energy in engines and machinery - not in bicycles.

Multiple choice general knowledge science & technology

Trains have stearing mechanism.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trains don't have steering mechanisms like cars do. They are guided by rails and wheels that are designed to follow the track. The direction is controlled by the railway switches and the track layout, not by steering within the train itself.

Multiple choice general knowledge science & technology

Which portion of Human Body has the thinnest skin?

  1. Armpit

  2. Eyelid

  3. Lips

  4. All of the above

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The eyelid has the thinnest skin in the human body, measuring only about 0.05mm thick. This extreme thinness allows for the rapid and flexible movement required for blinking and eye protection. The armpit has thicker skin with more sweat glands, while lips also have thicker tissue than eyelids.

Multiple choice general knowledge science & technology

Which Organs from the following secreate Hormones?

  1. Liver

  2. Pituitary

  3. Thyroid

  4. Ovary

  5. All of the above

  6. None Of the above.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

The pituitary gland produces multiple hormones including growth hormone and ADH, the thyroid gland secretes thyroxine and calcitonin, and ovaries produce estrogen and progesterone. The liver primarily performs metabolic functions like detoxification and protein synthesis, but is not an endocrine organ that secretes hormones.

Multiple choice general knowledge science & technology

Select the cause(s) for Gall-stone formation.

  1. Excessive consumption of Fatty-Junk foods.

  2. inherited body chemistry

  3. gallbladder motility (movement)

  4. All of the above.

  5. None Of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gallstones form due to multiple factors: excessive fatty foods increase cholesterol in bile, inherited body chemistry affects bile composition, and reduced gallbladder motility prevents complete emptying allowing crystals to form. These factors often work together to create ideal conditions for gallstone development.