MCQs

Explanation
Sounds travel faster through solids than through both gases and liquids. Solids have a more rigid structure , allowing sound waves to propagate more efficiently and at a faster speed. Here's a comparison of sound speeds in different materials: Solids (e.g., steel): up to 5,960 m/s (13,140 ft/s) Liquids (e.g., water): up to 1,482 m/s (4,862 ft/s) Gases (e.g., air): approximately 343 m/s (1,125 ft/s)

Explanation
Sound travels through a physical medium , such as air, water, or solid objects. It is transmitted through the vibration of particles in the medium.

Explanation
A  compound machine  is a machine that is made up of two or more simple machines. A bicycle, a crane, wheel borrow and scissors  are examples of compound machines  because they are made up of multiple simple machines , such as: Wheels and axles (simple machine: wheel) Pedals and levers (simple machine: lever) Gears and pulleys (simple machine: pulley) Inclined planes (simple machine: inclined plane)

Explanation
A compound machine is a machine that is made up of two or more simple machines. A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines , such as: Wheels and axles (simple machine: wheel) Pedals and levers (simple machine: lever) Gears and pulleys (simple machine: pulley) Inclined planes (simple machine: inclined plane)

Explanation
A screw is a simple machine that is an inclined plane wrapped around a cylinder.  It is used to fasten objects together , and it is used in: Fastening parts together Holding things in place Providing a secure grip Examples include: Wood screws (used in woodworking and construction) Machine screws (used in machinery and equipment) Self-tapping screws (used in plastic and metal) Bolts (used in heavy-duty applications) Lag screws (used in heavy construction) Deck screws (used in decking and outdoor construction) Drywall screws (used in drywall installation) Anchor screws (used in concrete and masonry)

Explanation
An  inclined plane  is a slanting surface connecting a lower level to a higher level. It is a simple machine that helps to lift  or move loads to a higher position, and  is commonly used in : Ramps Staircases Slides Ski lifts Hilly roads

Explanation
An inclined plane is a slanting surface connecting a lower level to a higher level. It is a simple machine that helps to lift or move loads to a higher position, and is commonly used in : Ramps Staircases Slides Ski lifts Hilly roads

Explanation
A wheel with a rod, called an axle, through its center lifts or moves loads. Example : Screw driver, handle is wheel and its shaft is axle, a car wheel. The wheel and axle simple machine is used in many applications , such as: Transportation (cars, bicycles, etc.) Lifting heavy loads (cranes, winches, etc.) Moving objects (wheelbarrows, shopping carts, etc.)

Explanation
A wedge is an object with at least one slanting side ending in a sharp edge, which is used to cut or split material apart. Examples : Axes, knives, chisels, plough nall, s harpener, iron nails and pins (push pin).

Explanation
The three valves of the trumpet add lengths of tubing to the instrument to lower the pitch.

Explanation
Xi. Jinping has been the president of China since 2013, making him the most powerful man in the world. 

Explanation
Mirza Asadullah Baig Khan, also known by the pen names of Ghalib and Asad, was an Indian poet. His honorific was Dabir-ul-Mulk, Najm-ud-Daula. Born: December 27, 1797, Agra, India Died: February 15, 1869, Delhi, India

Explanation
The Pfizer vaccine requires two doses, ideally 21 days apart. That being said, the vaccine has shown to have a high efficacy rate after a single dose, up to 85 percent , according to a 2021 study published in the Lancet.

Explanation
:Game plan a strategy for achieving an objective.

Explanation
One of the team captains chooses heads or tails before the referee tosses the coin.

Explanation
Coin flipping, coin tossing, or head or tail is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to choose between two alternatives, heads or tails, sometimes used to resolve a dispute between two parties.

Explanation
Offside is one of the laws of association football, codified in Law 11 of the Laws of the Game. The law states that a player is in an offside position if any of their body parts, including the hands .

Explanation
In addition ethics is important because of the following: S atisfying Basic Human Needs: Being fair, honest and ethical is one the basic human needs.A

Explanation
International law, also called public international law or law of nations , the body of legal rules, norms, and standards that apply between sovereign states and other entities that are legally recognized as international actors.