Practice MCQ Questions and answers on Physics-GK

A wheel barrow is an example of second class lever as the load is between the fulcrum and effort,hence it is a second class lever.

A single fixed pulley is used to draw a bucket of water from a well. It is easy to draw from a well using a pulley because it helps in changing the direction of the force applied. This, in turn, makes it easy to move the object. In this case, the pulley helps in lifting the bucket full of water upwards.

A fixture is a work-holding or support device used in the manufacturing industry. Fixtures are used to securely locate (position in a specific location or orientation) and support the work, ensuring that all parts produced using the fixture will maintain conformity and interchangeability.

The axe head and the doorstop are both examples of a wedge, a type of simple machine. It also acts as a type of lever.

While ascending a hill Gear Ratio should be “Either equal to or greater than 1. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.

The size of the gear is usually specified by the pitch circle diameter. It is also called as pitch diameter.

Bicycle is an example of compound machine. A compound machine is a combination of two or more simple machines.

A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. This is in contrast to a simply supported beam such as those found in a post and lintel system. A simply supported beam is supported at both ends with loads applied between the supports. Cantilevers are widely found in construction, notably in cantilever bridges.

A machine powered by rotating blades is a turbines. A turbine is a device that harnesses the kinetic energy of some fluid - such as water, steam, air, or combustion gases - and turns this into the rotational motion of the device itself.[2] These devices are generally used in electrical generation, engines, and propulsion systems and are classified as a type of engine.

Second and third class levers are differentiated by the location of the load.