Indian Navy Tradesman Mate flashcards

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

Letter position reverse

Each letter's reverse position equals 27 minus its forward position: A=26, B=25, ..., Z=1. Useful in alphabet series and coding questions where letters mirror around the middle.

Ranking formula total persons

If a person ranks nth from the left and mth from the right in a row, the total number of persons is n + m − 1. This holds only when the person is counted from both ends.

Blood relation symbols

Draw a family tree using a square for a male, circle for a female, horizontal line for siblings, vertical line for parent-child, and double line for spouse. This prevents confusion in multi-generation puzzles.

Right and left turns

Facing north, a right turn means turning east (90° clockwise) and a left turn means west (90° counter-clockwise). Track the facing direction after every turn before plotting the next move.

Odd one out strategy

Check each option against a common rule such as letter-position sum, vowel count, or number of letters. The option that fails the rule shared by all others is the answer.

Coding shift code

In shift codes, compare each letter of the word with its coded form. A constant difference across all letters means the code is a fixed +n or −n shift.

Average and new average

Average equals sum of items divided by number of items. When one new value x is added, the new average is (old sum + x) divided by (old count + 1).

Successive percentage change formula

Two successive changes of a% and b% give a net change of a + b + (ab ÷ 100) percent. A positive result is a net increase; a negative result is a net decrease.

Compound interest minus simple interest

For two years at rate R, the gap between compound and simple interest equals P × (R ÷ 100)². This shortcut identifies the extra interest earned on interest in year two.

Profit percent base

Profit percent and loss percent are always computed on cost price: Profit% = (SP − CP) ÷ CP × 100. If two items sell at the same price with equal profit and loss percent, the net result is a loss of (x ÷ 10)² percent.

Km/h to m/s conversion

To convert kilometres per hour to metres per second, multiply by 5/18. To go the other way, multiply metres per second by 18/5. This is essential in trains and boats problems.

Boats and streams speeds

Downstream speed is boat speed plus stream speed; upstream speed is boat speed minus stream speed. Boat speed = (down + up) ÷ 2; stream speed = (down − up) ÷ 2.

Time and work together

If A alone finishes work in a days and B alone in b days, together they finish in ab ÷ (a + b) days. For more workers, add their one-day work fractions and take the reciprocal.

Ratio division of amount

To divide an amount N in the ratio a : b : c, first find the total parts a + b + c. Each share equals N multiplied by its part divided by the total parts.

Circle and cylinder formulas

Area of a circle is πr² and its circumference is 2πr. The volume of a cylinder is πr²h, where r is the base radius and h is the height.

Simple interest formula

Simple interest equals principal × rate × time divided by 100 (SI = PRT ÷ 100). It is calculated only on the original principal, not on accumulated interest.

Articles a and an rule

Use 'a' before a consonant sound and 'an' before a vowel sound, decided by pronunciation, not spelling. So 'an hour', 'a university', 'an honest man', 'a European'.

Subject verb agreement basics

A singular subject takes a singular verb and a plural subject takes a plural verb. Words such as each, every, either, and neither take a singular verb.

Active to passive voice

In passive voice, the object becomes the subject, the verb becomes be + past participle, and the original subject becomes 'by + agent'. Example: 'He wrote a letter' becomes 'A letter was written by him'.

Direct to indirect speech

In reported speech, pronouns change to match the reporter, the tense shifts one step back, and time words change (today to that day, tomorrow to the next day).

Present perfect tense use

Present perfect (has/have + past participle) describes a past action with present relevance or an action continuing to now. It is not used with a definite past time like 'yesterday'.

Common idiom meanings

'At the drop of a hat' means immediately; 'once in a blue moon' means very rarely; 'to bite the bullet' means to endure pain bravely; 'a piece of cake' means very easy.

One word substitutions

A philanthropist loves mankind; a misanthrope hates mankind; an omnipotent being is all-powerful; an ephemeral thing is short-lived. These substitutions often appear in vocabulary questions.

I before E spelling rule

Write 'i' before 'e' except after 'c', as in believe and receive. When adding a vowel suffix, drop a final silent e: make becomes making, write becomes writing.

Indian Navy Day date

Indian Navy Day is observed on 4 December, commemorating Operation Trident in the 1971 Indo-Pak war. The Navy motto is 'Sham No Varunah', meaning may the Lord of Waters be auspicious.

Indian Navy admiral ranks

Officer ranks ascend: Sub Lieutenant, Lieutenant, Lieutenant Commander, Commander, Captain, Commodore, Rear Admiral, Vice Admiral, Admiral. The Admiral rank is held by the Chief of the Naval Staff.

Indian Navy commands

Major Navy commands: Western (Mumbai), Eastern (Visakhapatnam), Southern (Kochi), and training command at Kochi. The Andaman and Nicobar Command at Port Blair is a tri-service command.

Constitution adoption dates

The Indian Constitution was adopted on 26 November 1949 and came into force on 26 January 1950. Fundamental Rights appear in Part III (Articles 12 to 35).

Indian national symbols

National bird: Indian peafowl. National animal: Bengal tiger. National flower: lotus. National fruit: mango. National river: Ganga. These frequently appear in general awareness questions.

Indian defence days

Republic Day is 26 January; Independence Day is 15 August; Navy Day is 4 December; Army Day is 15 January; Air Force Day is 8 October; Kargil Vijay Diwas is 26 July.

Highest gallantry awards

The Param Vir Chakra is India's highest wartime gallantry award, followed by the Maha Vir Chakra. The Ashoka Chakra is the highest peacetime gallantry award.

Tropic of Cancer states

The Tropic of Cancer passes through eight Indian states, including Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram. It does not pass through any southern state.