scientist, discoveries & inventions MCQ section 3 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Answer: (d)

An automobile is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor.

The term motorcar has also been used in the context of electrified rail systems to denote a car that functions as a small locomotive but also provides space for passengers and baggage.

Although several other German engineers (including Gottlieb Daimler, Wilhelm Maybach, and Siegfried Marcus) were working on the problem at about the same time, Karl Benz generally is acknowledged as the inventor of the modern automobile.

Answer: (c)

The smallpox vaccine was the first successful vaccine to be developed. The process of vaccination was first publicised by Edward Jenner in 1796, who acted upon his observation that milkmaids who caught the cowpox virus did not catch smallpox.

Before the introduction of a vaccine, the mortality of the severe form of smallpox—variola major—was very high. Historical records show that a method of inducing immunity was already known.

A process called inoculation, also known as insufflation or variolation was practised in India as early as 1000 BC.

Answer: (d)

Answer: (d)

There are different methods of counting microbial growth. These are based on different parameters of cells such as dry-weight and wet-weight measurement, absorbance, cell plate, density, turbidity, ATP measurement, viable count, ATPase activity and use of Coulter counter. Absorbance is measured by using a spectrophotometer.

Cell growth of any bacterial suspension at a particular wavelength at different intervals is measured in terms of absorbance.

Answer: (d)

An optical fibre (or optical fibre) is a flexible, transparent fibre made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or “light pipe”, to transmit light between the two ends of the fibre.

The field of applied science and engineering concerned with the design and application of optical fibres is known as fibre optics. Optical fibres are widely used in fibre-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communication.

Narinder Singh Kapany (born 31 October 1926 in Moga, Punjab, India) is an Indian born American physicist who invented optical fibre.