Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

What is the source for long period Comets in our Solar system?

  1. Asteroid belt

  2. Kuiper belt

  3. Oort cloud

  4. Local Interstellar Cloud
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Oort Cloud is a theoretical spherical shell of icy objects surrounding our solar system at distances between 2,000 and 100,000+ astronomical units. It is believed to be the source of long-period comets (those with orbital periods greater than 200 years) that enter the inner solar system. The Kuiper Belt (option B) is the source of short-period comets.

Multiple choice general knowledge science & technology

who proposed Geocentric model?

  1. Nicolaus Copernicus

  2. Claudius Ptolemy

  3. Tycho Brahe

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

Claudius Ptolemy developed the geocentric model in the 2nd century CE, placing Earth at the center of the universe. Copernicus later proposed the heliocentric model, and Galileo provided evidence supporting it.

Multiple choice general knowledge science & technology

black holes are black because:

  1. reflects all, absorbs nothing

  2. reflects all,absorbs all

  3. reflects nothing,absorb all

  4. reflects nothing,abosrbs nothing
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Black holes appear black because their gravitational pull is so strong that they absorb all light and reflect nothing. No light can escape from within the event horizon, making them completely invisible against the darkness of space.

Multiple choice general knowledge science & technology

black hole movement how been tracked?

  1. by determining mass density in space

  2. by tracking of movement of stars around a fixed place in space

  3. by determining the deepest dark place in space

  4. by light tracking
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Black hole movement can be tracked by measuring mass density variations in space and by observing the orbital patterns of stars around invisible points. Scientists have used stellar motion around Sagittarius A* to confirm the supermassive black hole at our galaxy's center.

Multiple choice general knowledge science & technology

who propounded "gravity does make an effect on light's motion"?

  1. Albert Einstein

  2. Karl Schwarzschild

  3. Arthur Eddington

  4. Robert Oppenheimer & Subrahmanyan Chandrasekhar
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Albert Einstein first proposed that gravity affects light's motion through his General Theory of Relativity in 1915. His work predicted that massive objects like stars would bend light passing near them, which was later confirmed by Eddington's observations.

Multiple choice general knowledge science & technology

what is Event Horizon?

  1. a edge from which light never escapes

  2. an edge near which light reflects off

  3. an edge from which light gets refracted

  4. an edge at which nothing happens!!
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The event horizon is the boundary surrounding a black hole beyond which nothing can escape, not even light. It's the point of no return for any matter or radiation. Options B, C, and D are incorrect - the event horizon is not about reflection, refraction, or 'nothing happening'.

Multiple choice general knowledge science & technology

what is lensing effect?

  1. bending of magnetic field curvature

  2. bending of light due to gravitational effect

  3. bending of light due to high mass of black hole

  4. bending of light due to highly electromagnetic source
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gravitational lensing is the bending of light due to gravitational effects from massive objects, not just black holes. It occurs when a massive body curves spacetime, causing light to follow a curved path. Option B is correct - it's about gravity's effect on light. Options A, C, and D are incorrect as they mention magnetic fields or restrict it to black holes.

Multiple choice general knowledge science & technology

if we are on earth and observe a person entering event horizon of black hole..how will be our experience?

  1. person quickly entering into the blackhole

  2. person entering blackhole but as the time progresses he seems to be entering the blackhole after infinite time!

  3. nothing can be observed even at the moment of entering blackhole

  4. he woul be torn apart due to extreme strong inward force of black hole
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

From the perspective of an observer on Earth, someone falling into a black hole appears to slow down as they approach the event horizon due to gravitational time dilation, and seems to take infinite time to cross it. This is called infinite redshift. Option B correctly describes this relativistic effect. Options A, C, and D are incorrect.

Multiple choice general knowledge science & technology

The population of a country increased by an average of 2% per year from 2000 to 2003. If the population of this country was 2 000 000 on December 31, 2003, then the population of this country on January 1, 2000, to the nearest thousand would have been?

  1. 1 848 000

  2. 1 852 000

  3. 1 000 000

  4. 1 500 000
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the formula P = A / (1 + r)^n, where A=2,000,000, r=0.02, and n=4 (years 2000, 2001, 2002, 2003), the calculation yields approximately 1,847,691. Rounded to the nearest thousand, this is 1,848,000.