Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr. During the first 20 kilometers, an average speed of 40 km/hr is maintained. During the next 10 kilometers, however, the motorist goofs off and averages only 20 km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must drive

  1. 60 km/hr

  2. 80 km/hr

  3. 90 km/hr

  4. faster than the speed of light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To average 40 km/hr over 40 km, you must complete the trip in exactly 1 hour. But you already spent 30 minutes on the first 20 km (20/40 hr) plus 30 minutes on the next 10 km (10/20 hr), totaling 60 minutes. You have zero time left to cover the remaining 10 km, which is impossible.

Multiple choice general knowledge science & technology

Suppose in a restaurant your coffee is served about 5 or 10 minutes before you ask for it. In order that it should be as hot as possible when you drink it, should you pour in the room temperature cream right away or when you are ready to drink the coffee?

  1. Pour the cream in right away.

  2. Pour the cream when you are ready to drink the coffee.

  3. Both will be same!

  4. Don't pour cream at all!
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Newton's law of cooling, heat loss rate is proportional to temperature difference. Adding cream sooner reduces the coffee's temperature earlier, creating a smaller temperature difference with surroundings and slower heat loss thereafter, resulting in hotter coffee at drinking time.

Multiple choice general knowledge science & technology

Suppose you have to walk barefoot across red hot coals of wood. If your feet are wet (thereby making your feet cooler), you will

  1. feel more heat

  2. feel less heat

  3. feel same amount of heat

  4. not be able to feel!
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When feet are wet, the water evaporates upon contact with the heat, creating a brief protective layer of steam (Leidenfrost effect) and absorbing some heat energy, which results in feeling less heat initially compared to dry skin.

Multiple choice general knowledge science & technology

A piece of iron has a temperature of 10°C. A second identical piece of iron is twice as hot. What is the temperature of the second piece of iron?

  1. 20°C

  2. 40°C

  3. 293ºC

  4. 273ºC
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

'Twice as hot' means doubling the absolute temperature. 10°C = 283K. Doubling gives 566K, which is 566 - 273 = 293°C. Note: option C has a typo (degree symbol should be °, not superscript °, but the value 293°C is correct).

Multiple choice general knowledge science & technology

Microsoft search page

  1. Bing

  2. Google

  3. MSN

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bing is Microsoft's search engine service. Google is a separate company's product. MSN is a Microsoft web portal, not a search engine. This is a factual knowledge question about major search engines.

Multiple choice general knowledge science & technology

List out the browsers below

  1. Firefox

  2. Netscape

  3. Opera

  4. IE
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Firefox, Netscape, Opera, and IE (Internet Explorer) are all software applications used to access and navigate the World Wide Web. Since this is an MC-2 (multiple choice, multiple correct) type, all four are valid selections.