BAF Officer Cadet flashcards
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- Subject-verb agreement rule
- A singular subject takes a singular verb and a plural subject takes a plural verb; compound subjects joined by 'and' usually take a plural verb.
- Passive voice formation
- The object becomes the subject, the verb becomes a form of 'be' plus the past participle, and the original subject follows 'by' if retained.
- Affect versus effect
- 'Affect' is normally a verb meaning to influence, while 'effect' is normally a noun meaning a result or outcome.
- Quadratic root sum and product
- For ax²+bx+c=0, the sum of roots equals −b/a and the product of roots equals c/a.
- Arithmetic progression nth term
- The nth term of an arithmetic progression is a+(n−1)d, where a is the first term and d is the common difference.
- Combination formula nCr
- nCr equals n! divided by r!(n−r)! and counts selections where the order of chosen items does not matter.
- Trigonometric Pythagorean identity
- For any angle θ, sin²θ plus cos²θ equals 1; dividing by cos²θ yields 1+tan²θ=sec²θ.
- Newton's second law
- The net force on a body equals its mass multiplied by its acceleration, expressed as F = ma in SI units.
- Ohm's law
- Current through a conductor is directly proportional to voltage across it and inversely proportional to resistance: V = IR.
- Wave speed relation
- Wave speed equals frequency multiplied by wavelength, so a higher frequency at fixed speed means a shorter wavelength.
- Latent heat of fusion
- The heat needed to change unit mass of a solid to liquid at constant temperature, given by Q = mL.
- UN Security Council veto
- The five permanent members - USA, UK, France, Russia, and China - can block substantive Security Council resolutions.
- SAARC founding
- The South Asian Association for Regional Cooperation was founded in 1985 and has its secretariat in Kathmandu, Nepal.
- International Mother Language Day
- UNESCO declared 21 February International Mother Language Day to honor the 1952 Language Movement martyrs of Dhaka.
- Bretton Woods institutions
- The International Monetary Fund and World Bank were created at the 1944 Bretton Woods conference and are headquartered in Washington.
- Language Movement date
- On 21 February 1952, students demonstrating for Bangla as a state language in Dhaka were killed, sparking national remembrance.
- Proclamation of independence
- Bangladesh's independence was declared on 26 March 1971, following the Pakistan Army's Operation Searchlight on 25 March.
- Victory Day
- Observed on 16 December, marking the 1971 surrender of Pakistani forces in Dhaka and the end of the Liberation War.
- Bangladesh constitution adoption
- The Constitution of Bangladesh was adopted on 4 November 1972 and came into effect on 16 December 1972.
- Padma Bridge significance
- Opened in 2022, it is Bangladesh's longest bridge, linking southwestern districts to the capital and funded domestically.
- Mole concept
- One mole contains 6.022×10²³ particles, and the number of moles equals mass divided by molar mass.
- pH scale meaning
- A scale from 0 to 14 where values below 7 are acidic, 7 is neutral, and above 7 is basic; pH = −log[H⁺].
- Photosynthesis equation
- Six carbon dioxide molecules plus six water molecules, using light and chlorophyll, yield one glucose and six oxygen molecules.
- Universal blood donor
- People with O-negative blood are universal donors because their red cells lack A, B, and Rh antigens.
- DNA base pairing
- In the DNA double helix, adenine pairs with thymine and guanine pairs with cytosine, held by hydrogen bonds.
- Mitochondria function
- These organelles carry out aerobic respiration, generating most of the cell's ATP energy supply.
- Reverse alphabet coding
- A letter at position n from the start maps to position 27−n, so A becomes Z and B becomes Y.
- Syllogism validity test
- A conclusion is valid only if it is true in every possible arrangement satisfying the premises, not merely in one.
- Blood relation: uncle
- The brother of one's father or mother, or the husband of a parent's sibling, is called an uncle.
- Direction displacement resultant
- Two perpendicular displacements combine into a resultant whose magnitude is the square root of the sum of their squares.
- Number series approach
- Compare successive differences and ratios first, then check squares, cubes, and alternating sub-series patterns.
- Analogous pair relation
- Find the relationship linking the first pair, such as part to whole or cause to effect, then apply it to the second pair.