Rajasthan Police Constable flashcards
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- Constitution adoption date
- The Constitution of India was adopted by the Constituent Assembly on 26 November 1949 and came into force on 26 January 1950, which is celebrated as Republic Day.
- Nobel Prize categories
- Nobel Prizes are awarded in Physics, Chemistry, Medicine, Literature, Peace, and Economic Sciences. The Economic Sciences prize was established later by the Bank of Sweden.
- G20 2023 host
- India hosted the 2023 G20 summit in New Delhi. The G20 is a forum of major economies, founded in 1999, focusing on global economic cooperation.
- Rajasthan formation day
- Rajasthan was formed on 30 March 1949 as the 'Rajasthan Union' and was renamed Rajasthan on 26 January 1950. The day is celebrated as Rajasthan Diwas.
- Aravalli Range
- The Aravalli Range is the oldest fold mountain system in the world, running across Rajasthan. It divides the state into fertile eastern plains and the arid western desert.
- Battle of Haldighati
- Fought in 1576 between Maharana Pratap of Mewar and the Mughal army led by Man Singh I. It is a key event in Rajasthan's history, symbolizing Rajput resistance.
- Indira Gandhi Canal
- The Indira Gandhi Canal, earlier known as Rajasthan Canal, is the longest canal in India. It starts from Harike Barrage in Punjab and irrigates the Thar Desert districts of Rajasthan.
- Ghoomar dance
- Ghoomar is a traditional folk dance of Rajasthan performed by women, especially of the Bhil tribe. It involves swirling movements and is performed during festivals and weddings.
- Profit percentage formula
- Profit percentage = (Profit / Cost Price) × 100. Selling Price = Cost Price × (100 + Profit%) / 100. Used to calculate gain or loss in commercial transactions.
- Simple Interest formula
- Simple Interest = (Principal × Rate × Time) / 100. It is calculated only on the original principal, not on accumulated interest, unlike compound interest.
- Speed conversion km/h to m/s
- To convert speed from kilometres per hour to metres per second, multiply by 5/18. For example, 72 km/h = 72 × 5/18 = 20 m/s.
- Sum of first n natural numbers
- The sum of the first n natural numbers is n(n+1)/2. This formula helps quickly add series like 1+2+3+...+n in aptitude problems.
- Pythagoras theorem
- In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides: hypotenuse² = base² + perpendicular².
- Average change rule
- If every number in a set is increased or decreased by the same value k, the average also increases or decreases by k. This helps solve average problems quickly.
- Alphabet positions
- In reasoning, letters are numbered A=1, B=2, ..., Z=26. Reverse positions are Z=1, Y=2, ..., A=26. Useful for coding-decoding and series problems.
- Blood relation: son
- If 'A is the son of B', then A is male and B is a parent. In blood relation puzzles, gender and generation must be tracked carefully.
- Direction sense: right turn
- If a person facing north turns right, he faces east. Turning left from north means facing west. This rule helps solve direction and distance puzzles.
- Calendar odd days
- A normal year has 1 odd day, a leap year has 2 odd days. 100 years have 5 odd days, 200 years have 3, 300 years have 1, and 400 years have 0.
- Cube cutting formula
- A cube painted on all faces and cut into n³ smaller cubes has (n−2)³ cubes with no painted face. This formula is used in cube-cutting reasoning problems.
- Syllogism rule
- From 'All A are B' and 'All B are C', it follows that 'All A are C'. However, 'Some A are B' does not imply 'Some B are A' unless stated.
- Ohm's law
- Ohm's law states that V = IR, where V is voltage, I is current, and R is resistance. It applies to ohmic conductors at constant temperature.
- pH scale
- The pH scale measures acidity or alkalinity, ranging from 0 to 14. pH below 7 is acidic, 7 is neutral, and above 7 is basic.
- Mitochondria function
- Mitochondria are called the powerhouse of the cell because they produce ATP through cellular respiration, supplying energy for cellular activities.
- Photosynthesis equation
- Photosynthesis is the process by which green plants convert carbon dioxide and water into glucose and oxygen using sunlight and chlorophyll: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
- Newton's first law
- Newton's first law states that an object remains at rest or in uniform motion in a straight line unless acted upon by an external force. Also called law of inertia.
- Hindi vowels and consonants
- हिंदी वर्णमाला में 11 स्वर और 33 व्यंजन होते हैं। स्वर 'अ' से 'औ' तक होते हैं और व्यंजन 'क' से 'ह' तक।
- संज्ञा के भेद
- संज्ञा के पाँच भेद हैं: व्यक्तिवाचक (जैसे राम), जातिवाचक (जैसे नदी), भाववाचक (जैसे मिठास), समूहवाचक (जैसे सेना), और द्रव्यवाचक (जैसे सोना)।
- समास के भेद
- समास के छह भेद हैं: तत्पुरुष, कर्मधारय, द्विगु, द्वंद्व, बहुव्रीहि, और अव्ययीभाव। ये शब्द-निर्माण के नियम बताते हैं।
- काल के भेद
- काल के तीन भेद हैं: वर्तमान, भूत, और भविष्यत्। प्रत्येक के चार उपभेद होते हैं: सामान्य, अपूर्ण, पूर्ण, और संदिग्ध।
- Parts of speech
- The eight parts of speech in English are noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection. They classify words by function in a sentence.
- Active to passive voice
- To change active to passive, the object becomes the subject, the verb becomes 'be + past participle', and the original subject becomes 'by + agent'.
- Articles a, an, the
- Use 'a' before consonant sounds, 'an' before vowel sounds, and 'the' for specific or unique nouns. Articles are determiners that modify nouns.