Idea for the Q&A below: The relevant information to answer the above question is: A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles.
Q: A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the vehicle from "running away" by accelerating down the hill. They are not usually capable of bringing vehicles to a standstill, as their effectiveness diminishes as vehicle speed lowers. They are usually used as an additional "assistance" to slow vehicles, with the final braking done by a conventional friction braking system. As the friction brake will be used less, particularly at higher speeds, their service life is increased, and since in those vehicles the brakes are air-actuated helps to conserve air pressure too.

What is a retarder on a semi truck?
A: a device used to augment or replace some of the functions of primary friction - based braking systems

Idea for the Q&A below: To answer the above question, the relevant sentence is: In humans, implantation is the stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus.
Q: In humans, implantation is the stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is a blastocyst. It is by this adhesion that the fetus receives oxygen and nutrients from the mother to be able to grow.

Answer this question: where does the implantation of a fertilized egg occur?
A: the wall of the uterus

Idea for the Q&A below: To answer the question, consider the following: "Drinkin' Problem" is the debut single of the American country music band Midland.
Q: "Drinkin' Problem" is the debut single of the American country music band Midland. It was released on July 27 2017, as the first single from their upcoming debut album On the Rocks. The band members wrote the song with Josh Osborne and Shane McAnally, the latter of whom also produced it.

Who sings some say i have a drinking problem?
A: Midland

Idea for the Q&A below: The relevant sentence in the passage is: These set of norms has been evolved with the consensus of political parties who have consented to abide by the principles embodied in the said code in its letter and spirit. The Model Code of Conduct comes into force immediately on announcement of the election schedule by the commission for the need of ensuring free and fair elections.

Q: Election Commission of India's Model Code of Conduct is a set of guidelines issued by the Election Commission of India for conduct of political parties and candidates during elections mainly with respect to speeches, polling day, polling booths, election manifestos, processions and general conduct. These set of norms has been evolved with the consensus of political parties who have consented to abide by the principles embodied in the said code in its letter and spirit. The Model Code of Conduct comes into force immediately on announcement of the election schedule by the commission for the need of ensuring free and fair elections. Much of it is designed to avert communal clashes and corrupt practices. For example, politicians should not make hate speeches, putting one community against another or make promises about new projects that may sway a voter.

When does model code of conduct come into force?
A: immediately on announcement of the election schedule by the commission