Haryana Police Constable flashcards

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

Shah Commission

Commission whose recommendation led to the creation of Haryana as a separate state, carved out of Punjab on 1 November 1966.

Haryana state bird

The black francolin is the state bird of Haryana; the blackbuck is the state animal and the peepal the state tree.

Kurukshetra

Haryana district traditionally identified with the Mahabharata battlefield; it contains Brahma Sarovar and is a major pilgrimage and tourism site.

Three Battles of Panipat

Fought in 1526, 1556 and 1761 at Panipat in Haryana; the first established Mughal rule, the third checked Maratha expansion.

Haryana divisions count

Haryana has 22 districts grouped into six divisions: Ambala, Gurugram, Hisar, Karnal, Rohtak and Faridabad.

Surajkund Mela

Annual international crafts fair held at Surajkund near Faridabad, Haryana, showcasing Indian handicrafts, handlooms and folk performances.

Successive percentage change

Two successive changes of a% and b% produce a net change of a + b + (ab/100) percent; a rise then equal fall always gives a net loss.

Alligation rule

Ratio of quantities of two ingredients mixed to give a mean price equals (mean − cheaper) : (dearer − mean).

Trains crossing platform

Time taken equals the sum of train length and platform length divided by the train's speed, after converting km/h to m/s.

CI minus SI for two years

For two years, compound interest exceeds simple interest by P times (R/100) squared, where P is principal and R the annual rate.

Work together formula

If A finishes a job in a days and B in b days, working together they finish it in ab divided by (a + b) days.

Sphere surface area

The surface area of a sphere is 4πr² and its volume is (4/3)πr³, where r is the radius.

Total from two ranks

When a person is nth from the left and mth from the right in a row, the total number of persons is n + m − 1.

Syllogism validity test

A conclusion is valid only if it holds in every possible Venn diagram consistent with the given premises, not merely in one arrangement.

Odd day calendar rule

An ordinary year shifts the weekday by one odd day, a leap year by two; 100 years give five odd days and 400 years give none.

Blood relation diagramming

Draw a tree with explicit gender marks for each person; never assume gender from a name, profession or marital role.

Direction displacement

Plot each move as a vector from a fixed North; for right-angled turns the final distance is the square root of the sum of squared components.

Ohm's law

Current through a conductor is directly proportional to potential difference at constant temperature, giving V = IR where R is resistance in ohms.

Universal blood donor

O negative red blood cells lack A, B and Rh D antigens, so they can be transfused to recipients of any ABO and Rh group.

Photosynthesis equation

Six carbon dioxide molecules and six water molecules yield one glucose and six oxygen molecules using chlorophyll and sunlight in chloroplasts.

pH scale

Values below 7 indicate acidity, 7 is neutral and above 7 is basic; litmus turns red in acid and blue in base.

Deficiency diseases

Vitamin A deficiency causes night blindness, vitamin C scurvy, vitamin D rickets, iron anaemia and iodine deficiency goitre.

Volatile versus non-volatile memory

RAM is volatile and loses contents on power loss, while ROM retains data permanently; cache memory is faster than RAM but much smaller.

Worm versus trojan

A worm self-replicates and spreads across networks without a host file, while a trojan disguises itself as legitimate software to trick users.

Common port numbers

HTTP uses port 80, HTTPS 443, FTP 21 and SMTP 25; these defaults let clients reach the correct service on a server.

TCP versus UDP

TCP is connection-oriented and guarantees ordered delivery with acknowledgements, whereas UDP is connectionless, faster and used for streaming and DNS queries.

दीर्घ संधि

जब दो समान या सवर्ण स्वर मिलते हैं तो दोनों के स्थान पर एक दीर्घ स्वर बनता है, जैसे विद्या + आलय = विद्यालय।

बहुव्रीहि समास

जिस समास में कोई पद प्रधान न होकर दोनों पद मिलकर किसी तीसरे अर्थ का बोध कराएँ, जैसे दशानन का अर्थ दस मुख वाला रावण।

अनुप्रास अलंकार

जहाँ एक ही वर्ण की आवृत्ति एक से अधिक बार होती है, वहाँ अनुप्रास अलंकार होता है, जैसे चारु चंद्र की चंचल किरणें।

Subject-verb agreement trap

In the phrase one of the plus a plural noun, the verb agrees with one and stays singular, as in one of the boys is absent.

Affect versus effect

Affect is usually a verb meaning to influence, while effect is usually a noun meaning the result of a change.

Idiom: beat about the bush

To avoid coming to the main point and speak around it instead of addressing the matter directly.