science & tech MCQ section 7 MCQ Questions & Answers Detailed Explanation

Answer: (c)

In the wake of large number of deaths due to viral disease Ebola, the use of drug ZMapp was approved to combat the disease.

Answer: (a)

Facebook on 4 April 2013 released the software called Home, which puts the feeds from Facebook on Android phones’ home screen. Software would become the wrapper for Android operating system. It will become the primary way of handling the phone.

Answer: (b)

Subrahmanyan Chandrasekhar was an Indian-American astrophysicist who, with William A. Fowler, won the 1983 Nobel Prize for Physics for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars. The Chandrasekhar limit is named after him.

Chandrasekhar was the nephew of Sir Chandrasekhara Venkata Raman, who won the Nobel Prize for Physics in 1930. Chandrasekhar in distinct periods worked in various areas including stellar structure, theory of white dwarfs, stellar dynamics, theory of radiative transfer, quantum theory of the negative ion of Hydrogen, hydrodynamic and hydromagnetic stability, equilibrium and the stability of ellipsoidal figures of equilibrium, general relativity. the mathematical theory of black holes and the theory of colliding gravitational waves.

Answer: (c)

AMCA will be fitted with K9 or K10 engines. The engines will be developed in collaboration with a foreign manufacturer.

Answer: (a)

The chromosphere (literally, “sphere of colour”) is the second of the three main layers in the Sun’s atmosphere and is roughly 2,000 kilometers deep. It sits just above the photosphere and just below the solar transition region. Helium, the lighter of the noble gases, was the first to be discovered. In fact, this element was first identified in the Sun’s chromosphere rather than in the Earth.

Answer: (d)

Microwaves are electromagnetic waves with wavelengths ranging from as long as one meter to as short as one millimetre, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz. A microwave oven passes (nonionizing microwave radiation (at a frequency near 2.45 GHz) through food, causing dielectric heating by absorption of energy in the water, fats and sugar contained in the food.

Bluetooth and Wi-Fi have many applications: setting up networks, printing, or transferring files. They also work in the given frequency range. All cordless sold in the US use the 1.9 GHz or 2.4-GHz bands.