Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Claymore is anti-tank weapon?

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Claymore M18 is an anti-personnel mine that directs fragmentation in a fan-shaped pattern, not an anti-tank weapon. Anti-tank weapons like ATGMs or HEAT rounds are designed to penetrate armored vehicle armor, whereas the Claymore uses steel balls to incapacitate personnel in its kill zone.

Multiple choice general knowledge science & technology

Boiling water under normal atmospheric pressure is at temperature of ____ .

  1. 100 degree celcius

  2. more than 100 degree celcius.

  3. less than 100 degree celcius

  4. can be more or less than 100 degree celcius
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At standard atmospheric pressure (1 atm or 101.325 kPa), pure water boils at exactly 100 degrees Celsius. This is the boiling point at which water vapor pressure equals atmospheric pressure. The question specifies normal atmospheric pressure, which makes 100°C the correct answer.

Multiple choice general knowledge science & technology

you go to a very high hill station. you have a picnic there. you try to cook food in open pan. you find that the time taken for cooking is more than it took back at your home.

  1. the above statement is false

  2. because the water boils at less than 100 degree celcius on hill, so more time is required

  3. because water is very cold at hill station

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

At higher altitudes, atmospheric pressure is lower, which causes water to boil at temperatures below 100°C. Since the maximum temperature reached by boiling water is lower, food takes longer to cook. This is a real phenomenon observed in hill stations and mountains.

Multiple choice general knowledge science & technology

food in pressure cooker gets cooked early than in open pan.

  1. the above statement is false.

  2. in pressure cooker the pressure is high so food is cooked early

  3. in pressuere cooker the pressure is low so the food is cooked early

  4. in pressure cooker water boils at lower temperature cooking the food early
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A pressure cooker traps steam, increasing the pressure inside. Higher pressure raises the boiling point of water above 100°C, allowing food to cook at higher temperatures and therefore faster. Option C is incorrect because pressure is high, not low. Option D is wrong because water boils at higher temperature, not lower.

Multiple choice general knowledge science & technology

The whistle used to train dog is not audible to human ear.

  1. the above statement is false

  2. because they are infra-sonic whistle specially meant for dogs

  3. because they are ultra-sonic whistle specially made for dog

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

Dog whistles produce ultrasonic sounds (above 20 kHz) which are beyond the range of human hearing but within dogs' hearing range. Dogs can hear frequencies up to about 45-65 kHz, much higher than humans. Infrasound (below 20 Hz) would not be useful for dog training as dogs also have limited sensitivity there.

Multiple choice general knowledge science & technology

ultrasonic sound is ____.

  1. between 20 Hz to 20 kHz

  2. below 20 kHz

  3. equal to 20 kHz

  4. above 20 kHz
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ultrasonic sound is defined as sound waves with frequencies above 20 kHz (20,000 Hz), which is the upper limit of human hearing. The human audible range is 20 Hz to 20 kHz, so anything above 20 kHz is ultrasonic. Ultrasound is used in medical imaging, cleaning, and various industrial applications.

Multiple choice general knowledge science & technology

When ships sail in sea , the use SONAR method to find the depth of sea at any place or to locate any enemy submaries. The concept behind SONAR is ______ .

  1. superposition principle

  2. echo

  3. both of the above

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

SONAR (Sound Navigation and Ranging) works on the principle of echo - sound waves are emitted, reflected back from objects, and the time delay gives distance/depth. Superposition principle refers to wave interference, which is not the core concept here.

Multiple choice general knowledge science & technology

R.D.X

  1. Research Department eXplosive

  2. Recursive Detonating eXplosive

  3. Reactive Detonation eXplosive

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

RDX stands for Research Department Explosive, named from where it was developed - the Research Department at the Royal Arsenal in Woolwich, UK. It is a powerful high explosive used in military applications. The full chemical name is cyclotrimethylene trinitramine.

Multiple choice general knowledge science & technology

T.N.T.

  1. Tetra Nitrous Timber

  2. Tetra Nitrous Toluene

  3. Tri Nitro Toluene

  4. Tri Nitrous Timber
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

TNT stands for Tri Nitro Toluene, a well-known explosive compound. The name indicates its chemical structure - toluene with three nitro groups. It has been widely used in military and industrial applications due to its stability and safety.

Multiple choice general knowledge science & technology

LSD (drug)

  1. Lead Silver Drug

  2. Lysergic acid Diethylamide

  3. Lysergic Silver Drug

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

LSD stands for Lysergic acid Diethylamide, a potent psychedelic drug. It was first synthesized in 1938 and became famous for its consciousness-altering effects. The name comes from its chemical structure based on lysergic acid.