Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Identify the country that don’t have an army :-

  1. Nigeria

  2. Guinea

  3. Monaco

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

Monaco is one of the few countries in the world with no standing army; it relies on France for defense. Nigeria has one of Africa's largest militaries with over 200,000 personnel. Guinea maintains armed forces for national security. Romania has a modern military as a NATO member since 2004. Monaco's defense is guaranteed by France under a 1963 treaty.

Multiple choice general knowledge science & technology

Which Company Employs The Highest Number Of Employees?

  1. Samsung Corporation

  2. Microsoft

  3. Walmart

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

Walmart is widely recognized as the world's largest private employer, with approximately 2.3 million employees worldwide across its retail operations. While Samsung is a massive conglomerate, Walmart's workforce significantly exceeds that of other major corporations like Microsoft or Boeing (misspelled as 'Beoing' in option D).

Multiple choice general knowledge science & technology

Which Train Service Is The Fastest In Indian Railways?

  1. Shatabdi

  2. Rajdhani

  3. Garib Rath

  4. Duronto
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Shatabdi Express trains are among the fastest in Indian Railways, capable of reaching speeds up to 150-160 km/h. They were introduced specifically for high-speed daytime travel between important cities. While Rajdhani and Duronto are also premium services, Shatabdi holds the distinction for speed among operational services.

Multiple choice general knowledge science & technology

Which Is The Largest Conglomerate In The World?

  1. Samsung Group

  2. Tata Group

  3. Virgin Group

  4. Boeing Group
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Samsung Group is indeed considered the world's largest conglomerate by revenue and market capitalization. As a South Korean chaebol, it operates across diverse industries including electronics, shipbuilding, construction, and more. While Tata Group is India's largest conglomerate, it doesn't match Samsung's global scale.

Multiple choice general knowledge science & technology

Which Is The First Space Station Ever Launched?

  1. Mir

  2. International Space Station

  3. Salyut

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

Salyut 1, launched by the Soviet Union on April 19, 1971, was the world's first space station. It preceded both Mir (1986) and the International Space Station (1998). 'Freedom' was an early American space station proposal that was never built as initially conceived.

Multiple choice general knowledge science & technology

Which of the following is/are true about Ozone layer?

  1. Ozone layer is a concentration of ozone molecules up in the Stratosphere (10 to 50 kms)

  2. Ozone is produced only at the ground level and flows to high altitude to form Ozone layer

  3. In Stratosphere Ultraviolet rays break down oxygen molecules into atomic oxygen(O) which then combines with Oxygen molecule(O2) to form Ozone (O3)

  4. Around 90% of the Ozone in our atmosphere is contained in Troposphere only (within 10 kms)
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

The ozone layer (90% of atmospheric ozone) is in the stratosphere (10-50 km), formed when UV radiation splits oxygen molecules into atomic oxygen which then combines with O2 to form O3. Ozone is NOT produced only at ground level, and 90% is NOT in the troposphere. This process is fundamental atmospheric chemistry.

Multiple choice general knowledge science & technology

Which one of the following is used to measure ozone level in the atmosphere?

  1. By the number of ozone atoms in an atmospheric column, called Chapman unit

  2. By expressing the columnar density of Ozone in Dobson unit (thickness of ozone in an atmospheric column under standard temperature and pressure)

  3. By measuring the ultraviolet radiation level in the ground

  4. By measuring the Oxygen level in the Stratosphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ozone levels are measured in Dobson Units (DU), representing the thickness of the ozone layer in a column compressed to standard temperature and pressure. 300 DU = 3mm thick layer. Chapman unit is not used for ozone measurement. Ground UV or oxygen measurements don't directly quantify ozone. This is standard atmospheric science.

Multiple choice general knowledge science & technology

One of the following does NOT cause depletion in Ozone layer. Which one is it?

  1. Human activities of using CFC, HCFC within air-conditioners or refrigerators

  2. Man-made climate change leading to unusual reduction in stratospheric temperature (while temperature nearer earth increases)

  3. Dumping of old refrigerators in the ground

  4. Volcanic eruptions leading to injection of hydrogen chloride (HCl) into the atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CFCs/HCFCs from refrigeration and climate change affecting stratospheric temperatures both cause ozone depletion. Dumping old refrigerators releases CFCs. Volcanic HCl DOES cause depletion but the question asks what does NOT cause depletion - this is a double negative trick question. All options except volcanic eruptions are anthropogenic, but volcanoes ARE natural ozone-depleting agents.

Multiple choice general knowledge science & technology

It is known that if Ozone layer is depleted, ultraviolet rays, especially UV-B reaches the ground. Which one of the following is NOT an impact of Ozone depletion?

  1. Human health is severely impacted with impacts such as Skin Cancer, cataracts and damage to immune systems

  2. Phytoplankton production is reduced leading to severe impact on marine ecosystems

  3. Ozone depletion directly leads to natural calamities such as storms, floods etc

  4. By severely damaging plants and other sinks of greenhouse gases, ozone depletion leads to climate change
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone depletion increases UV-B reaching earth, causing skin cancer, cataracts, immune damage (A), reduces phytoplankton (B), and damages plants worsening climate change (D). However, it does NOT directly cause storms/floods - those are separate climate phenomena. This tests understanding of ozone depletion's actual impacts versus speculative effects.