Explanation:

Ecology deals with: Correct Answer Relations between organisms and their environment Ecology is the study of the relationships between living organisms, including humans, and their physical environment; it seeks to understand the vital connections between plants and animals and the world around them.

Explanation:

চোখের পানির উৎস কোথায়? সঠিক উত্তর ল্যাক্রিমান গ্রন্থি চোখের পানির উৎস ল্যাক্রিমান গ্রন্থি

Explanation:

ক খ এর পুত্র । খ এবং পরস্পর বোন। ঘ হচ্ছে গ এর মা, চ, ঘ এর পুত্র। চ এর সথে ক সম্পর্ক কী? সঠিক উত্তর ক এর মামা চ ক হচ্ছে খ এর পুত্র। আবার খ এবং গ পরস্পর বোন। সুতরাং খ এর মা এবং গ এর মা হলো ঘ। চ যেহেতু ঘ এর পুত্র, অর্থাৎ খ এর ভাই। সুতরাং ক এর মামা হলো চ।

Explanation:

নিচের কোন ঔষধটি এনেসথেসিয়ায় ব্যবহৃত হয়? সঠিক উত্তর Ketamine Ketamine is a medication mainly used for starting and maintaining anesthesia.It induces a trance - like state while providing pain relief, sedation, and memory loss.Other uses include sedation in intensive care and treatment of pain and depression. Heart function, breathing, and airway reflexes generally remain functional.Effects typically begin within five minutes when given by injection, and last up to approximately 25 minutes.

Explanation:

The branch of science that studies cells is called _ Correct Answer cytology Entomology is the study of insects and their relationship to humans, the environment, and other organisms. Entomologists make great contributions to such diverse fields as agriculture, chemistry, biology, human/animal health, molecular science, criminology, and forensics.

Explanation:

Upper atmospheric 03 layer is depleted by--- Correct Answer Freon gas Ozone depletion, gradual thinning of Earth's ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica.

Explanation:

Which of the following helps in blood cell clotting ? Correct Answer platelet Secondary storage data usually resides on devices with non - volatile memory (NVM), such as hard disk drives (HDDs), solid - state drives (SSDs), tape drives, optical media and cloud storage.

Explanation:

Determine power rating of an electric motor if it runs at 1440 rpm and line shaft transmits torque of 75 Nm. Assume Reduction ratio =1.6 Correct Answer 7.068kW i = n / N 1.6 = 1440 / N N = 900 r.p.m P = (2 π x 1440 x 75) / 60 = 7068 W = 7.068 kW The power rating of an electric motor is 7.068 kW

Explanation:

The ratio of shear modulus to the modulus of elasticity for a poisson's ratio of 0.4 will be Correct Answer 5/14 Here, E = 2G(1 + v).G/E = 0.5/(1 + 0.4) = 0.5/1.4. = 5/14.

Explanation:

A cantilever beam of length L carries a gradually varying load form zero at free and w per unit length at the fixed end. The maximum deflection lies at Correct Answer free end Reflection of a Pulse at a Free End. ... That is, a pulse with an upward displacement will reflect off the end and return with an upward displacement. Sometimes it is said that the pulse is not inverted. This behavior of non - inversion will always be observed when the end of the medium is free to move.

Explanation:

which type of gears has point contact between two mating gears? Correct Answer spiral gears In case of spur gears, the contact between tooth profiles is line contact, and in case of helical gears the contact is point contact. So answer is Helical Gear (A).

Explanation:

Most of the oxy-acetylene welding is done with Correct Answer neutral flame Neutral Welding Flame. The neutral flame has a one - to - one ratio of acetylene and oxygen. It obtains additional oxygen from the air and provides complete combustion. It is generally preferred for welding.

Explanation:

If the depth of water in an open channel is greater than the critical depth, the flow is called Correct Answer tranquil flow If the depth of water in an open channel is greater than the critical depth, the flow is called. turbulent flow.

Explanation:

If there are no externally induced flow velocities, then the Nusselt Number (Nu) does not depend upon Correct Answer Reynolds number The maximum number of processes that can be in Ready state for a computer system with n CPUs is Independent of n.

Explanation:

The bending moment on a section is maximum where shear force is Correct Answer zero The maximum bending moment occurs in a beam when the shear force at that section is zero or changes the sign because at point of contra flexure the bending moment is zero. Explanation: The positive bending moment in a section is considered because it causes convexity downwards.

Explanation:

A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant , is called Correct Answer hyperbolic process Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space. It is a measure of the reflectivity of the earth's surface. Ice, especially with snow on top of it, has a high albedo: most sunlight hitting the surface bounces back towards space. Insolation is the incident solar radiation onto some object. Specifically, it is a measure of the solar energy that is incident on a specified area over a set period of time. Generally, insolation is expressed in two ways.

Explanation:

The fuel mostly used in cement industry and in metallurgical processes is Correct Answer pulverized coal Lead pollutes the air of a big city. Lead (Pb) is a metal found naturally in the environment as well as in manufactured products. The major sources of lead emissions have historically been from fuels in on - road motor vehicles (such as cars and trucks) and industrial sources.

Explanation:

which of the following refrigerant has the lowest freezing point? Correct Answer Freon -22 Tsunamis are caused by sudden movements of the earth that happens under the sea. Often the most destructive Tsunamis are caused by earthquakes but causes can also include volcanic eruptions, landslides or even a comet hitting the sea. Landslides cause tsunamis when the debris falls into the water.

Explanation:

Which from the following is true for 'Sound'?Sound cannot pass through ---. Correct Answer through a vacuum Sound cannot travel through a perfect vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibration to work in.

Explanation:

The maximum frictional force , which comes into play , when a body just begins to slide over the surface of the surface of the other body, is known as Correct Answer limiting friction Standard sea - level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.

Explanation:

In are welding , the temperature of heat produced by the elcetric are is of the order of Correct Answer 6000°C to 7000°C The current official and working languages of the United Nations are: Arabic. Chinese. English. French. Russian. Spanish.

Explanation:

The process of removing metal by a cutter which is rotated against the direction of travel of the workpiece, is called Correct Answer up milling float(x) − Converts x to a floating - point number.

Explanation:

Transverse fillet welds are designed for Correct Answer tensile strength Argentina, Uruguay, the United States and Yugoslavia each won their respective groups to qualify for the semi - finals. In the final, hosts and pre - tournament favourites Uruguay defeated Argentina 4 – 2 in front of a crowd of 68,346 people, and became the first nation to win the World Cup.

Explanation:

A device which coverts chemical energy into electrical energy is called? Correct Answer Battery A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation - reduction (redox) reaction.

Explanation:

The sun is a -- ? Correct Answer Star The Sun is a star. There are lots of stars, but the Sun is the closest one to Earth. It is the center of our solar system. The Sun is a hot ball of glowing gases. It keeps our planet warm enough for living things to thrive. It gives us light so we can see. Eight planets move around the Sun. We call that an orbit. The planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Lots of smaller worlds orbit the Sun. Pluto is a dwarf planet beyond Neptune. There are many asteroids and comets that go around the Sun, too.

Explanation:

Wind energy is the -- energy. Correct Answer Kinetic Wind energy is a form of solar energy. Wind energy (or wind power) describes the process by which wind is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical power. A generator can convert mechanical power into electricity.

Explanation:

As the number of cylinders on multi cylinder engines increases the power to weight ratio Correct Answer Increases Entomology is the study of insects and their relationship to humans, the environment, and other organisms. Entomologists make great contributions to such diverse fields as agriculture, chemistry, biology, human/animal health, molecular science, criminology, and forensics.

Explanation:

In a Diesel engine, during combustion the pressure may increase at a range of Correct Answer 55 - 75 atm Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun. This is called the heliocentric, or Sun - centered, system.

Explanation:

Ozone layer prevents -- radiation from entering the atmosphere ? Correct Answer Ultraviolet The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers (9.3 to 21.7 mi) above Earth, although its thickness varies seasonally and geographically.

Explanation:

which of the following is a universal blood donor? Correct Answer O In transfusions of packed red blood cells, individuals with type O Rh D negative blood are often called universal donors. Those with type AB Rh D positive blood are called universal recipients.

Explanation:

A universal donor is a person having blood group of __ Correct Answer O+ For emergency transfusions, blood group type O negative blood is the variety of blood that has the lowest risk of causing serious reactions for most people who receive it. Because of this, it's sometimes called the universal blood donor type.

Explanation:

British Honduras is now known as _ Correct Answer Belize British Honduras was a British Crown colony on the east coast of Central America, south of Mexico, from 1862 to 1964, then a self - governing colony, renamed Belize in June 1973, until September 1981, when it gained full independence as Belize. British Honduras was the last continental possession of the United Kingdom in the Americas.

Explanation:

Famous play 'Macbeth ' is written by _ Correct Answer John Milton Macbeth ( full title The Tragedy of Macbeth) is a tragedy by William Shakespeare; it is thought to have been first performed in 1606. It dramatises the damaging physical and psychological effects of political ambition on those who seek power for its own sake. Of all the plays that Shakespeare wrote during the reign of James I, who was patron of Shakespeare's acting company, Macbeth most clearly reflects the playwright's relationship with his sovereign. It was first published in the Folio of 1623, possibly from a prompt book, and is Shakespeare's shortest tragedy.

Explanation:

Night blindness is caused by the deficiency of __ Correct Answer Vitamin -A Vitamin A deficiency means lack of vitamin A in the blood and tissues. This is the first and foremost reason behind night blindness and is the leading cause of preventable childhood blindness.

Explanation:

AC কে DC করার যন্ত্র- সঠিক উত্তর রেকটিফায়ার A rectifier is an electrical device that converts alternating current, which periodically reverses direction, to direct current, which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current.

Explanation:

বিদ্যুৎ শক্তিকে শব্দ শক্তিতে রুপান্তরিত করা হয় কোন যন্ত্রের মাধ্যমে - সঠিক উত্তর লাউড স্পিকার 107. বিদ্যুৎ শক্তিকে শব্দ শক্তিতে রুপান্তরিত করা হয় কোন যন্ত্রের মাধ্যমে - Loudspeaker

Explanation:

একটি বাল্বে " 60 W- 220 V" লেখা আছে। বাল্বটির রোধ কত ওহম ( Ohm) ? সঠিক উত্তর 806.67 একটি বাল্বে " 60 W - 220 V" লেখা আছে। রোধ বের করতে হবে - - এখানে, বিভব পার্থক্য, V = 220volt ক্ষমতা, P = 60 watt রোধ , R = ? আমরা জানি , P = V2 ÷ R R = V2 ÷ PR = {(220 × 220) ÷ 60} R = 806.67 ohm .

Explanation:

বাতাসের আর্দ্রতা মাপার যন্ত্রের নাম কি? সঠিক উত্তর হাইগ্রোমিটার ১। হাইগ্রোমিটার - - বায়ুতে আর্দ্রতা পরিমাপক যন্ত্র ২। হাইড্রোমিটার - - তরলের আপেক্ষিক গুরুত্ব বা ঘনত্ব নির্ণায়ক। ৩। ল্যাক্টোমিটার - - দুধের বিশুদ্ধতা নির্ণায়ক যন্ত্র ৪। ব্যারোমিটার - বায়ুমন্ডলের চাপ নির্ণায়ক যন্ত্র

Explanation:

নবায়নযোগ্য জ্বালানীর উৎস- সঠিক উত্তর বায়োগ্যাস জীবাশ্ম জ্বালানির বিভিন্ন উৎস যেমন প্রাকৃতিক গ্যাস, কয়লা, খনিজ তেল ইত্যাদির ব্যবহারের সাথে সাথে সহজে নিঃশেষ হয়ে যায়। অপরদিকে নবায়নযোগ্য শক্তির উৎস যেমন সৌরশক্তি, বায়ু শক্তি, জলবিদ্যুৎ ইত্যাদি ব্যবহারের সাথে সাথে সহজে নিঃশেষ হয়ে যায় না।