Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Thermal expansion and contraction of pipeline is directly proportional to lenght(L)

  1. directly proportional to lenght(L)

  2. inversely proportional to lenght(L)

  3. is not proportional

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the formula for linear thermal expansion (ΔL = α × L × ΔT), the change in length (ΔL) is directly proportional to the original length (L) of the pipeline. This means longer pipelines will experience more total expansion and contraction than shorter ones for the same temperature change, all else being equal. The coefficient of thermal expansion (α) is a material property.

Multiple choice general knowledge science & technology

Thermal expansion and contraction of pipeline is directly proportional to lenght(L)

  1. directly proportional to lenght(L)

  2. inversely proportional to lenght(L)

  3. is not proportional

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is an exact duplicate of question 91564. The correct answer remains that thermal expansion is directly proportional to length (L). According to the linear thermal expansion formula ΔL = α × L × ΔT, longer pipelines expand and contract more than shorter ones for the same temperature change. This question should be flagged as a duplicate.

Multiple choice general knowledge science & technology

Heat Tracing is a process of heating a pipeline system to prevent

  1. Expansion

  2. Clustering

  3. Freezing

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

Heat tracing is an active heating method that maintains temperatures in pipelines above freezing point. It prevents ice formation that could block flow or rupture pipes. Carbonizing (D) refers to carbon deposition, while expansion (A) and clustering (B) are unrelated to thermal protection.

Multiple choice general knowledge science & technology

Match List•I with List-ll correctly and select your answer using the codes given below— List-I (a) Relationship between electricity and magnetism (b) Velocity of light (c) Radio waves (d) Structure of atom List•lI 1. Neils Bohr 2. Ampere 3. Foucault 4. Hertz

  1. a-1 b-3 c-4 d-2

  2. a-3 b-4 c-2 d-1

  3. a-2 b-3 c-4 d-1

  4. a-4 b-3 c-1 d-2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ampere (2) discovered the relationship between electricity and magnetism. Foucault (3) measured the velocity of light. Hertz (4) discovered radio waves. Neils Bohr (1) proposed the atomic structure. Option C correctly matches a-2, b-3, c-4, d-1.

Multiple choice general knowledge science & technology

Fuel cells are used in—

  1. Aircrafts

  2. Electric locomotives

  3. Space crafts

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

Fuel cells generate electricity through electrochemical reactions, producing only water and heat as byproducts. This clean, efficient power source is ideal for spacecraft where weight and emissions matter. Aircraft (A) and submarines (D) typically use other power sources.

Multiple choice general knowledge science & technology

From which of the following biodiesel is obtained ?

  1. Ethyl alcohol

  2. Cellulose

  3. Bagasse

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

Biodiesel is produced from vegetable oils and animal fats, primarily from oilseed plants. Jatropha (D) is a major biodiesel source, though the option spells it as 'Iatropha' - this appears to be a typo for Jatropha. Ethyl alcohol (A), cellulose (B), and bagasse (C) are not biodiesel feedstocks.