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નીચેના પ્રશ્નોના ટૂંકમાં (એક-બે વાક્યોમાં) જવાબ આપો
(1) ‘અષ્ટવક્રાસન'નો અર્થ સમજાવો..
(2) યોગમુદ્રાસનમાં હાથની સ્થિતિ જણાવો.
(3) વક્રાસનના બે ફાયદા જણાવો.
(4) દ્રિપાદશિરાસન કરતાં શું ધ્યાન રાખવું જોઈએ ?
(5) વૃશ્ચિકાસન કોણે ન કરવું જોઈએ ?
આપેલા વિકલ્પોમાંથી સાચો વિકલ્પ જણાવી ઉત્તર આપોઃ
(1) નીચેના પૈકી ક્યા આસનમાં કમરમાંથી આગળ ઝુકવાનું નથી ?
(A) યોગમુદ્રાસન (B) વજાસન (C) ભૂ-નમનાસન (D) પશ્ચિમોત્તાનાસન
(2) કયું આસન બે આસનોનું મિશ્રણ છે ?
(A) વક્રાસન | (B) મકરાસન (C) પધસવાંગાસન (D) ધનુરાસન
| 3) કયું આસન આરામ માટેનું આસન છે ?
(A) મકરાસન (B) વજાસન (C) કિપાદશિરાસન (D) વક્રાસન
(4) નીચેનામાંથી કયું વિધાન અષ્ટવક્રાસનને લાગુ પડતું નથી ?
(A) તેમાં બંને પગની આંટી લગાવવાની છે. (B) તેમાં શરીરમાં આઠ વળાંક દેખાય છે.
| (C) તેમાં બંને પગ પર સંતુલન મેળવવાનું છે. (D) તેમાં બંને હાથ પર સંતુલન મેળવવાનું છે.
-5) નીચેનામાંથી કયું આસન કરવાથી અંતઃસ્ત્રાવી ગ્રંથિઓની સક્રિયતા વધે છે ?
Answers
Answer:
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as "boats" rather than "ships" irrespective of their size.[1]
Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during World War I (1914–1918), and are now used in many navies large and small. Military uses include attacking enemy surface ships (merchant and military), or other submarines, aircraft carrier protection, blockade running, ballistic missile submarines as part of a nuclear strike force, reconnaissance, conventional land attack (for example using a cruise missile), and covert insertion of special forces. Civilian uses for submarines include marine science, salvage, exploration and facility inspection and maintenance. Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or undersea cable repair. Submarines are also used in tourism and undersea archaeology.
Most large submarines consist of a cylindrical body with hemispherical (or conical) ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes. In modern submarines, this structure is the "sail" in American usage and "fin" in European usage. A "conning tower" was a feature of earlier designs: a separate pressure hull above the main body of the boat that allowed the use of shorter periscopes. There is a propeller (or pump jet) at the rear, and various hydrodynamic control fins. Smaller, deep-diving and specialty submarines may deviate significantly from this traditional layout. Submarines use diving planes and also change the amount of water and air in ballast tanks to change buoyancy for submerging and surfacing.
Submarines have one of the widest ranges of types and capabilities of any vessel. They range from small autonomous examples and one- or two-person subs that operate for a few hours to vessels that can remain submerged for six months—such as the Russian Typhoon class, the biggest submarines ever built. Submarines can work at greater depths than are survivable or practical for human divers.[2] Modern deep-diving submarines derive from the bathyscaphe, which in turn evolved from the diving bell.