BTEB SSC Vocational flashcards
BTEB SSC Vocational · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- বাংলা স্বরবর্ণ সংখ্যা
- বাংলা বর্ণমালায় স্বরবর্ণের সংখ্যা ১১টি। এর মধ্যে ৭টি হ্রস্ব ও ৪টি দীর্ঘ স্বরবর্ণ হিসেবে গণ্য হয়।
- সন্ধি কাকে বলে
- দুইটি বর্ণের মিলনকে সন্ধি বলে। সন্ধি প্রধানত স্বরসন্ধি, ব্যঞ্জনসন্ধি ও বিসর্গসন্ধি - এই তিন ভাগে বিভক্ত।
- কারক কয় প্রকার
- বাংলা ব্যাকরণে কারক ৬ প্রকার: কর্তৃ, কর্ম, করণ, সম্প্রদান, অপাদান ও অধিকরণ। প্রতিটি কারক বিভক্তি দিয়ে চিহ্নিত হয়।
- Parts of speech count
- English has eight parts of speech: noun, pronoun, adjective, verb, adverb, preposition, conjunction and interjection. Every word functions as one of these in a sentence.
- Present perfect structure
- The present perfect tense is formed with have or has plus the past participle, as in 'she has finished'. It links a past action to the present moment.
- Passive voice formation
- Passive voice uses a form of the verb be plus the past participle. The active sentence's object becomes the subject, as in 'the letter was written'.
- Conditional type 2
- Type 2 conditionals use if plus the past simple in the if-clause and would plus the base verb in the main clause, expressing an unreal present situation.
- Quadratic formula
- For ax² + bx + c = 0, the roots are x = [−b ± √(b² − 4ac)] / 2a. The discriminant b² − 4ac determines whether roots are real or complex.
- Arithmetic progression nth term
- In an arithmetic progression with first term a and common difference d, the nth term is a + (n−1)d. The sum of n terms is n/2 times twice the first term plus (n−1)d.
- Circle area and circumference
- The area of a circle is πr² and its circumference is 2πr, where r is the radius. A sector's area equals (θ/360) times πr².
- Simple interest formula
- Simple interest equals principal × rate × time divided by 100. Compound amount equals principal times (1 + r/100) raised to the number of years.
- Newton's second law
- The net force on a body equals its mass multiplied by its acceleration, F = ma. The SI unit of force is the newton, equal to kg·m/s².
- Ohm's law
- For a conductor at constant temperature, current is directly proportional to potential difference, so V = IR. Electrical power equals VI, also I²R or V²/R.
- Kinetic and potential energy
- Kinetic energy of a moving mass is ½mv². Gravitational potential energy near Earth's surface is mgh, where h is height above the reference level.
- Equations of motion
- For uniform acceleration: v = u + at, s = ut + ½at², and v² = u² + 2as. Here u is initial velocity, v final velocity, a acceleration, s displacement.
- Mole concept
- One mole contains 6.022 × 10²³ particles, Avogadro's number. The molar mass in grams numerically equals the relative molecular mass of the substance.
- pH scale meaning
- pH equals the negative logarithm of hydrogen ion concentration. Values below 7 are acidic, exactly 7 neutral, and above 7 basic at standard conditions.
- Oxidation and reduction
- Oxidation is loss of electrons and reduction is gain of electrons, remembered as OIL RIG. The two always occur together in a redox reaction.
- Neutralisation reaction
- An acid reacting with a base produces a salt and water. Separately, an acid reacting with a metal produces a salt and hydrogen gas.
- Micrometer least count
- A standard metric micrometer has a least count of 0.01 mm, read from the main barrel scale plus the thimble division multiplied by 0.01 mm.
- Tolerance versus allowance
- Tolerance is the difference between upper and lower limits of a dimension. Allowance is the intentional clearance or interference between two mating parts.
- Drill cutting speed formula
- Cutting speed V equals π times diameter D times rpm N divided by 1000, giving metres per minute when D is in millimetres.
- Metric thread designation
- A designation such as M10 × 1.5 means a metric thread with 10 mm nominal major diameter and 1.5 mm pitch between successive threads.
- Tap drill size rule
- For metric threads, tap drill diameter is approximately the major diameter minus the thread pitch. An M10 × 1.5 thread therefore uses about an 8.5 mm drill.
- Vernier calliper reading
- Total reading equals the main scale reading plus the vernier division that coincides, multiplied by the least count, commonly 0.02 mm on a metric calliper.
- Hacksaw blade selection
- Use about 18 teeth per inch for thick solid sections and 24 to 32 teeth per inch for thin tube or sheet, so at least two teeth stay in contact.
- Tapping technique
- Start the tap square to the hole, apply lubricant, and use a quarter turn forward followed by a half turn back to break and clear the chips.
- Fire triangle
- Combustion needs three elements: fuel, oxygen and heat. Removing any one side of the triangle stops the fire from continuing.
- Electrical shock response
- First switch off the supply, then separate the victim using dry non-conducting material. Never touch the person while they remain in contact with live current.
- Control hierarchy
- Hazard control priority runs from elimination and substitution, through engineering and administrative controls, to personal protective equipment as the last resort.
- Five S method
- The five S are sort, set in order, shine, standardise and sustain. They organise the workplace, reduce wasted motion and make unsafe conditions visible.
- Noise action level
- Sustained workplace noise above 85 decibels on the A-weighted scale over an eight-hour shift requires hearing protection and noise control measures.