Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Speed of a wave

  1. v =T / ?

  2. v =? T

  3. v = ƒ / ?

  4. v = ƒ ?
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Wave speed is calculated as the product of frequency and wavelength: v = fλ. Option D correctly shows this relationship where the symbol represents wavelength. Options A and C incorrectly divide by wavelength, and option B has the correct factors but unclear notation.

Multiple choice general knowledge science & technology

De-Broglie Equation

  1. ?= m v / h

  2. ?= h m v

  3. ? = h / p

  4. ?= sqrt ( h / p )
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The de Broglie wavelength is given by λ = h/p, where h is Planck's constant and p is momentum (p = mv). Option C correctly states this fundamental relationship in quantum mechanics.

Multiple choice general knowledge science & technology

Ideal gas law

  1. P1 V1 = P2 V2

  2. P V = n R T

  3. V1 / T1 = V2 / T2

  4. V1 / V2 = T1 / T2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ideal gas law relates pressure (P), volume (V), amount of gas in moles (n), the universal gas constant (R), and temperature (T). PV = nRT is the correct and complete form.

Multiple choice general knowledge science & technology

Specific heat ratio

  1. ? = Cv / Cp

  2. ? = Cp / Cv

  3. ? = Cp Cv

  4. ? = m / Cp Cv
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The specific heat ratio (γ or kappa) is the ratio of specific heat at constant pressure (Cp) to specific heat at constant volume (Cv). It's a crucial parameter in thermodynamics and fluid mechanics.

Multiple choice general knowledge science & technology

Force

  1. F = m a2

  2. F = m a

  3. F = m / a

  4. F = a / m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Newton's second law of motion, force equals mass times acceleration (F = ma). This is a fundamental relationship in classical mechanics that describes how forces cause objects to accelerate.

Multiple choice general knowledge science & technology

Work

  1. W = F d2

  2. W = F d

  3. W = F / d

  4. W = d / F
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Work is defined as the product of force and displacement in the direction of the force (W = F·d·cosθ). For force and displacement in the same direction, this simplifies to W = Fd.

Multiple choice general knowledge science & technology

Resistance

  1. R = ? A / L

  2. R = ? A L

  3. R = ? L / A

  4. R = ? / A L
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The resistance of a conductor is given by R = ρL/A, where ρ is resistivity, L is length, and A is cross-sectional area. Longer conductors have more resistance, thicker ones have less.

Multiple choice general knowledge science & technology

Ohms law

  1. I =V R

  2. P= I2 R

  3. V = I R

  4. R= V I
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ohm's law states that voltage across a conductor is directly proportional to the current flowing through it. The correct relationship is V = IR, where V is voltage, I is current, and R is resistance. Option A incorrectly omits the division operation (should be I = V/R), option B is a power formula, and option D also omits division (should be R = V/I).

Multiple choice general knowledge science & technology

When atoms of two or more different substances join together what is produced?

  1. A Crystal

  2. A Compound

  3. Particles

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

When atoms from two or more different elements chemically bond together, they form a compound. Compounds have properties different from the elements that make them up. A crystal is a structured arrangement of particles, not specifically different substances joining. Particles and liquid are general terms not specific to chemical combination.

Multiple choice general knowledge science & technology

Which part of a cell controls the activities of the cell?

  1. Mitochondria

  2. Cytoplasm

  3. Golgi Apparatus

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

The nucleus serves as the cell's command center, housing DNA that regulates all cellular activities. Mitochondria generate energy, cytoplasm provides a medium for cellular processes, and the Golgi apparatus packages proteins. Only the nucleus contains the genetic instructions for controlling cell functions.