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ব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্স

ব্যাংক নিয়োগ প্রস্তুতি ⎯ লং কোর্স · তারিখ অনির্ধারিত · ৩৯ প্রশ্ন

১.
Optical fibers are mainly used for which of the following?
  1. ক
    ক) Weaving
  2. খ
    খ) Communication
  3. গ
    গ) Musical instruments
  4. ঘ
    ঘ) Food industry
ব্যাখ্যা
Optical fibers are mainly used in telecommunications, but they are also used for lighting, sensors, toys, and special cameras for seeing inside small spaces. They are sometimes used in medicine to see inside people, like down their throat.
২.
Wood is the main raw material for the manufacture of
  1. ক
    ক) Paint
  2. খ
    খ) Paper
  3. গ
    গ) Ink
  4. ঘ
    ঘ) Gun powder
ব্যাখ্যা
Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources
৩.
Nuclear fission is caused by the impact of:
  1. ক
    ক) Neutron
  2. খ
    খ) Proton
  3. গ
    গ) Deuteron
  4. ঘ
    ঘ) Electron
ব্যাখ্যা
In nuclear fission neutron is bumbarded on heavy metal like plutonium, urenium. In this process large amount of heat energy is produced.
৪.
The dark lines in the solar spectrum are due to-
  1. ক
    ক) Absorption of corresponding wavelengths by the prism used in the photograph.
  2. খ
    খ) Absence of corresponding wavelengths from the light emitted by the core of the sun
  3. গ
    গ) Absorption of corresponding wavelengths by the outer layers of the sun.
  4. ঘ
    ঘ) Destructive interference between waves of certain definite wavelengths.
ব্যাখ্যা
In physics and optics, the Fraunhofer lines are a set of spectral absorption lines named after the German physicist Joseph von Fraunhofer. The lines were originally observed as dark features (absorption lines) in the optical spectrum of the Sun.
৫.
The isotope of uranium capable of sustaining chain reaction is
  1. ক
    ক) U-239
  2. খ
    খ) U-249
  3. গ
    গ) U-235
  4. ঘ
    ঘ) U-245
ব্যাখ্যা
Uranium-235 has many uses such as fuel for nuclear power plants, and nuclear weapons such as nuclear bombs. Some artificial satellites, such as the SNAP-10A and the RORSATs were powered by nuclear reactors fueled with uranium-235.
৬.
Which among the following is a positively charged particle emitted by a radioactive element?
  1. ক
    ক) Cathode ray
  2. খ
    খ) Gamma ray
  3. গ
    গ) Beta ray
  4. ঘ
    ঘ) Alpha ray
ব্যাখ্যা
Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.
৭.
Decibel is the unit for
  1. ক
    ক) Intensity of sound
  2. খ
    খ) Intensity of heat
  3. গ
    গ) Speed of light
  4. ঘ
    ঘ) Radio wave frequency
ব্যাখ্যা

A sound unit is any acoustic unit of sound measurement.
dB, decibel - noise of sound measurement is called decibels (dB). Ratio of the sound pressure to reference pressure to something.
Sone - a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold, starting with 1 sone.
Phon - a unit of subjective loudness.
Hz, hertz - unit of sound frequency is called hertz (Hz)

৮.
Potassium Permanganate is used for purifying drinking water, because
  1. ক
    ক) It is a reducing agent.
  2. খ
    খ) It is an oxidising agent.
  3. গ
    গ) It is a sterilising agent.
  4. ঘ
    ঘ) It dissolves the impurities of water.
ব্যাখ্যা
Potassium permanganate oxidizes iron, manganese, and hydrogen sulfide into particles. The particles are then filtered with a multimedia filter which can be either manganese-coated aluminum silicate above manganese-treated green sand or an 8-inch layer of anthracite above manganese-treated greensand.
৯.
Which of the following is the lightest metal?
  1. ক
    ক) Mercury
  2. খ
    খ) Lithium
  3. গ
    গ) Lead
  4. ঘ
    ঘ) Silver
ব্যাখ্যা

The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3.
This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.

১০.
Water is a good solvent of ionic salts because:
  1. ক
    ক) It has a high specific heat
  2. খ
    খ) It has no colour
  3. গ
    গ) It has a high dipole moment
  4. ঘ
    ঘ) It has a high boiling point
ব্যাখ্যা

Water is a good solvent of ionic salts because it has a high dipole moment.
Salts are ionic compounds which, when dissolved in water, break up completely into ions.
They arise by the reaction of acids with bases, and they always contain either a metal cation or a cation derived from ammonium (NH4+).

১১.
Bell metal is an alloy of
  1. ক
    ক) Nickel and Copper
  2. খ
    খ) Zinc and Copper
  3. গ
    গ) Brass and Nickel
  4. ঘ
    ঘ) Tin and Copper
ব্যাখ্যা
Bell metal is a hard alloy used for making bells and related instruments, such as cymbals. It is a form of bronze with a higher tin content, usually in approximately a 4:1 ratio of copper to tin (typically, 78% copper, 22% tin by mass).
১২.
Permanent hardness of water can be removed by adding:
  1. ক
    ক) Potassium Permanganate
  2. খ
    খ) Bleaching Powder
  3. গ
    গ) Chlorine
  4. ঘ
    ঘ) Washing Soda
ব্যাখ্যা

Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble. The water is softened because it no longer contains dissolved calcium ions and magnesium ions.

১৩.
The two elements that are frequently used for making transistors are:
  1. ক
    ক) Iridium and Tungsten
  2. খ
    খ) Niobium and Columbium
  3. গ
    গ) Boron and Aluminium
  4. ঘ
    ঘ) Silicon and Germanium
ব্যাখ্যা
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Most transistors are made from very pure silicon, and some from germanium, but certain other semiconductor materials are sometimes used.
১৪.
What is laughing gas?
  1. ক
    ক) Sulphur dioxide
  2. খ
    খ) Hydrogen peroxide
  3. গ
    গ) Nitrous Oxide
  4. ঘ
    ঘ) Carbon monoxide
ব্যাখ্যা

Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O.
Nitrous oxide has significant medical uses, especially in surgery and dentistry, for its anaesthetic and pain reducing effects

১৫.
Which of the following is in liquid form at room temperature?
  1. ক
    ক) Francium
  2. খ
    খ) Cerium
  3. গ
    গ) Lithium
  4. ঘ
    ঘ) Sodium
ব্যাখ্যা
The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.
১৬.
Soda water contains
  1. ক
    ক) Carbonic acid
  2. খ
    খ) Sulphuric acid
  3. গ
    গ) Carbon dioxide
  4. ঘ
    ঘ) Nitrous acid
ব্যাখ্যা
Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. This produces a bubbly drink that's also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.
১৭.
Carbon, diamond and graphite are together called:
  1. ক
    ক) Isomorphs
  2. খ
    খ) Isotopes
  3. গ
    গ) Allotrope
  4. ঘ
    ঘ) Isomers
ব্যাখ্যা
Carbon is capable of forming many allotropes (structurally different forms of the same element) due to its valency. Well-known forms of carbon include diamond and graphite.
১৮.
The element common to all acids is
  1. ক
    ক) Sulphur
  2. খ
    খ) Nitrogen
  3. গ
    গ) Hydrogen
  4. ঘ
    ঘ) Carbon
ব্যাখ্যা
All acids contain hydrogen, but not all hydrogen-containing compounds are acids. Most acids also contain oxygen.
১৯.
Heavy water is:
  1. ক
    ক) Rain water
  2. খ
    খ) Tritium oxide
  3. গ
    গ) Deuterium oxide
  4. ঘ
    ঘ) PH 7
ব্যাখ্যা

Heavy water (deuterium oxide, 2H2O, D2O) is a form of water that contains only deuterium (2H or D, also known as heavy hydrogen) rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.

২০.
Galvanised iron sheets have a coating of
  1. ক
    ক) Lead
  2. খ
    খ) Chromium
  3. গ
    গ) Zinc
  4. ঘ
    ঘ) Tin
ব্যাখ্যা

Galvanisation is a process of coating ''Iron or Steel'' with Zinc to protect it from the Rusting.
Zinc ''weathers at a very slow rate'', so the coating protects the inner metal and provides it a very long life.
This process intact the steel with full strength and provide a more delightful appearance.
Zinc has a greater electronegativity than iron and provides a specific protection to the ''steel from the outer environment''.

২১.
The hardest substance available on earth is
  1. ক
    ক) Diamond
  2. খ
    খ) Platinum
  3. গ
    গ) Gold
  4. ঘ
    ঘ) Iron
ব্যাখ্যা
Diamond is the hardest natural material known, where hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest) using the Mohs scale of mineral hardness. Diamond has a hardness of 10 (hardest) on this scale.
২২.
The gas usually filled in the electric bulb is
  1. ক
    ক) Carbon dioxide
  2. খ
    খ) Oxygen
  3. গ
    গ) Nitrogen
  4. ঘ
    ঘ) Hydrogen
ব্যাখ্যা
Incandescent light bulbs are filled with an inert gas like nitrogen, argon, or krypton - so that the filament doesn't catch fire. Early ones were a vacuum. Flourecent lamps are filled with an inert gas plus mercury vapour or neon, which glows ultra-violet when charged. The inside of the bulb is painted to give it colour.
২৩.
What is the World Wide Web?
  1. ক
    ক) The part of the Internet that enables information-sharing via interconnected pages
  2. খ
    খ) Another name for the Internet
  3. গ
    গ) A computer game
  4. ঘ
    ঘ) A software program
ব্যাখ্যা
The World Wide Web is a subset of the Internet. Specifically, the Web is a collection of documents and applications residing on Internet servers around the world.
২৪.
Which one of the following is a search engine?
  1. ক
    ক) Netscape
  2. খ
    খ) Librarians' Index to the Internet
  3. গ
    গ) Macromedia Flash
  4. ঘ
    ঘ) Bing
ব্যাখ্যা
A search engine is a program that searches for Web documents with keyword (s) you specify. Yahoo!, Google, Bing and AltaVista are just some examples of search engines that have been created to help you find information on the Web.
২৫.
What is a GPU?
  1. ক
    ক) Graphical Performance Utility
  2. খ
    খ) Graphical Portable Unit
  3. গ
    গ) Grouped Processing Unit
  4. ঘ
    ঘ) Graphics Processing Unit
ব্যাখ্যা
It is a chip dedicated to performing 3D calculations.
২৬.
HTML is used to
  1. ক
    ক) Plot complicated graphs
  2. খ
    খ) Create a webpages
  3. গ
    গ) Translate one language into another
  4. ঘ
    ঘ) Solve a equations
ব্যাখ্যা
Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser.
২৭.
In which decade was the transistor invented?
  1. ক
    ক) 1940s
  2. খ
    খ) 1950s
  3. গ
    গ) 1960s
  4. ঘ
    ঘ) 1980s
ব্যাখ্যা
On December 23, 1947, William Shockley, Walter Brattain and John Bardeen, of Bell Labs, announced their discovery of the point-contact germanium transistor to management.
২৮.
What are three types of lasers?
  1. ক
    ক) Diode, inverted, pointer
  2. খ
    খ) Gas, solid state, diode
  3. গ
    গ) Gas, metal vapor, rock
  4. ঘ
    ঘ) Pointer, diode, CD
ব্যাখ্যা
The first laser was a solid state laser. Solid state refers to any solid material like a glass rod. Diode lasers are very common because they are used to read compact disks and digital video disks in computers, CD players, and DVD players. Before diode lasers, the most common type of laser may have been the helium-neon laser, in which the active medium is a combination of the two gasses helium and neon.
২৯.
What was the first ARPANET message?
  1. ক
    ক) Lo
  2. খ
    খ) Hello World
  3. গ
    গ) Cyberspace, the final frontier
  4. ঘ
    ঘ) Marry had a little lamb.
ব্যাখ্যা
Charley Kline Sends the First Message Over the ARPANET. The message was simply ''Lo'' instead of the intended word,''Login.''
৩০.
What does AM mean?
  1. ক
    ক) Angelo marconi
  2. খ
    খ) Anno median
  3. গ
    গ) Amplitude modulation
  4. ঘ
    ঘ) Amperes
ব্যাখ্যা
Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.
৩১.
Which is a type of Electrically-Erasable Programmable Read-Only Memory?
  1. ক
    ক) Flash
  2. খ
    খ) Hard disc
  3. গ
    গ) FARM
  4. ঘ
    ঘ) FRAM
ব্যাখ্যা
It's commonly used for MP3 players, computer BIOS code and ''thumb'' drives. Originally developed in Japan by Toshiba, it has become quite popular for products requiring non-volatile erasable memory. Flash devices have a limited number of erase cycles (typically 10,000 to 1,000,000 cycles) so they're not as good a choice for applications in which the data changes constantly. However, since it has no moving parts (unlike a hard disk) it is an excellent choice for storing the operating code for small personal electronics like PDAs, cell phones, digital cameras, and the data in items like MP3 players.
৩২.
Glass is made of the mixture of:
  1. ক
    ক) Quartz and mica
  2. খ
    খ) Sand and silicates
  3. গ
    গ) Salt and quartz
  4. ঘ
    ঘ) Sand and salt
ব্যাখ্যা
The most familiar, and historically the oldest, types of manufactured glass are ''silicate glasses'' based on the chemical compound silica (silicon dioxide, or quartz), the primary constituent of sand.
৩৩.
The type of glass used in making lenses and prisms is
  1. ক
    ক) Pyrex glass
  2. খ
    খ) Flint glass
  3. গ
    গ) Jena glass
  4. ঘ
    ঘ) Soft glass
ব্যাখ্যা
Flint glass is used in opticals and prisms. Flint glass is optical glass that has a relatively high refractive index and low Abbe number. A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their compensating optical properties, which reduces chromatic aberration.
৩৪.
Which one of the following is the petroleum wax?
  1. ক
    ক) Carnauba wax
  2. খ
    খ) Bees wax
  3. গ
    গ) Paraffin wax
  4. ঘ
    ঘ) Jonoba wax
ব্যাখ্যা
Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators. It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood. In wood and paper matches, it helps to ignite the matchstick by supplying an easily vaporized hydrocarbon fuel.
৩৫.
The abiotic and biotic components constitute the structure of an
  1. ক
    ক) atmosphere
  2. খ
    খ) Ecosystem
  3. গ
    গ) energy flow
  4. ঘ
    ঘ) environment
ব্যাখ্যা
Biotic components are the living things that shape an ecosystem. Examples of biotic components include animals, plants, fungi, and bacteria. Abiotic components are non-living components that influence an ecosystem. Examples of abiotic factors are temperature, air currents, and minerals.
৩৬.
AIDS is caused by:
  1. ক
    ক) Helminth
  2. খ
    খ) Virus
  3. গ
    গ) Bacteria
  4. ঘ
    ঘ) Fungus
ব্যাখ্যা

Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease.
HIV is a sexually transmitted infection (STI). It can also be spread by contact with infected blood or from mother to child during pregnancy, childbirth or breast-feeding. Without medication, it may take years before HIV weakens your immune system to the point that you have AIDS.
There's no cure for HIV/AIDS, but medications can dramatically slow the progression of the disease. These drugs have reduced AIDS deaths in many developed nations.

.
৩৭.
Which layer protects earth from harmful rays of the Sun?
  1. ক
    ক) Troposphere
  2. খ
    খ) Magnetosphere
  3. গ
    গ) Ionosphere
  4. ঘ
    ঘ) Ozone layer
ব্যাখ্যা
The ozone layer protects us from harmful ultraviolet rays of the sun.
৩৮.
The percentage of oxygen present in air is approximately-
  1. ক
    ক) 40%
  2. খ
    খ) 21%
  3. গ
    গ) 44%
  4. ঘ
    ঘ) 23%
ব্যাখ্যা
The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
৩৯.
Newton is the unit of:
  1. ক
    ক) Acceleration
  2. খ
    খ) Velocity
  3. গ
    গ) Force
  4. ঘ
    ঘ) Momentum
ব্যাখ্যা
The newton is the International System of Units (SI) derived unit of force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.