BD Police Constable Written flashcards

33 cards. Read the term and the definition here. The deck at the top of this page is optional.

Bengali alphabet totals

Bengali has 11 vowels and 39 consonants, giving 50 letters in all. Vowels are written independently or as signs attached to consonants.

Charyapada significance

The Charyapada is the earliest known Bengali literary text, a collection of Buddhist mystic songs. Haraprasad Shastri discovered the manuscript in 1907 in Nepal.

Samas (compound) types

Bengali compounds fall into six main classes: dvandva, karmadharaya, tatpurusha, bahuvrihi, dvigu and avyayibhava. Each joins words into a single unit.

Rabindranath Nobel Prize

Rabindranath Tagore won the 1913 Nobel Prize in Literature for the English translation of Gitanjali. He was the first Asian to receive a Nobel Prize.

Present perfect tense

Formed with have or has plus the past participle. It connects a past action to the present and cannot take definite past time markers like yesterday.

Third conditional structure

If plus past perfect in the condition clause, then would have plus past participle in the result. It describes unreal past situations and their imagined outcomes.

Speed unit conversion

To change kilometres per hour into metres per second, multiply by 5/18. To reverse, multiply metres per second by 18/5.

Compound interest formula

Compound amount equals principal times (1 + rate/100) raised to the number of years. Compound interest is that amount minus the principal.

LCM and HCF relation

For two positive integers, the product of their LCM and HCF equals the product of the two numbers themselves. This holds only for two numbers.

Successive discount formula

Two successive discounts of a percent and b percent equal one discount of a + b - ab/100 percent. The result is always less than the simple sum.

Bangladesh independence dates

Independence was declared on 26 March 1971. Victory Day falls on 16 December 1971, when Pakistani forces surrendered in Dhaka.

Bangladesh Constitution basics

The Constitution took effect on 16 December 1972. Its original four principles were nationalism, socialism, democracy and secularism.

SAARC founding details

SAARC was established in 1985 in Dhaka by seven South Asian states. Its permanent secretariat is located in Kathmandu, Nepal.

UN Security Council seats

The Security Council has 15 members: five permanent members with veto power and ten non-permanent members elected for two-year terms by the General Assembly.

RAM versus ROM

RAM is volatile working memory that loses data on power loss. ROM is non-volatile and holds permanent firmware such as the startup BIOS.

Byte and bit units

One byte equals eight bits. One kilobyte equals 1024 bytes, one megabyte equals 1024 kilobytes, and one gigabyte equals 1024 megabytes.

IPv4 versus IPv6

IPv4 addresses are 32 bits long and written in four decimal groups. IPv6 addresses are 128 bits and written in hexadecimal groups.

Newton's second law

Force equals mass times acceleration, written F = ma. Acceleration rises with force and falls as mass increases for the same force.

Ohm's law

Voltage equals current times resistance, written V = IR. Electric power can be found as P = VI, P = I squared R, or P = V squared over R.

pH scale meaning

A pH below 7 is acidic, exactly 7 is neutral, and above 7 is basic. Litmus paper turns red in acid and blue in base.

Photosynthesis equation

Six carbon dioxide molecules plus six water molecules, using light energy and chlorophyll, yield one glucose molecule and six oxygen molecules inside chloroplasts.

Latitude versus longitude

Latitude lines run east to west and measure 0 to 90 degrees north or south of the equator. Longitude lines run pole to pole and measure 0 to 180 degrees east or west.

Earth's rotation and revolution

Earth spins on its axis once in about 24 hours, producing day and night. It orbits the Sun in about 365.25 days, producing seasons.

Bangladesh river system

The Padma, Meghna and Jamuna are the main rivers of the delta. The Padma is the lower course of the Ganges after it enters Bangladesh.

Contour lines on maps

Contour lines join points of equal elevation on a map. Closely spaced lines indicate steep ground, while widely spaced lines indicate gentle slopes.

Greenhouse effect

Greenhouse gases such as carbon dioxide, methane and water vapour trap outgoing infrared radiation, warming the surface. More gas raises the surface temperature.

Bangladesh cyclone seasons

Cyclones strike in pre-monsoon April and May and post-monsoon October and November. The shallow Bay of Bengal intensifies storm surges.

Three Rs of waste

Waste management priority runs reduce, then reuse, then recycle. Reducing consumption prevents waste before any reuse or recycling step is needed.

Richter and Mercalli scales

The Richter scale measures earthquake magnitude logarithmically, so each whole number is about ten times larger. The Mercalli scale describes observed intensity by effects.

Bangabandhu Satellite-1

Bangabandhu Satellite-1 is Bangladesh's first communications satellite, launched in May 2018. It provides broadcasting and telecommunications coverage across the region.

ASEAN founding

ASEAN was founded in 1967 in Bangkok by five states. Its permanent secretariat is located in Jakarta, Indonesia, and membership later expanded.

Nobel Peace Prize venue

Nobel Prizes were established by Alfred Nobel's will. The Peace Prize is awarded in Oslo, Norway, while the other prizes are awarded in Stockholm, Sweden.

Heat transfer methods

Conduction moves heat through solids, convection through fluids by circulation, and radiation through space without any medium, as sunlight reaching Earth shows.