Explanation

Nickel and Iron present in the inner core of the Earth are together known as NiFe.

The extreme pressure exerted on the inner core by the rocks of the layers lying above causes the NiFe to be in a solid state.

Explanation

• Coal, fossil fuels, crude oil, natural gas, etc are all hydrocarbon fuels.
• These are called as non-renewable source of energy because they take millions of years to regenerate themselves.
• Water energy is renewable because it is regenerated by water cycle.
• Also wind energy and solar energy are renewable sources of energy.

Explanation

Solar energy is radiated from the sun in the form of electromagnetic waves of shorter wavelength of 0.2 to 0.4 micrometers.

Out of all the solar energy radiations reaching the earth's atmosphere,

8% is ultraviolet radiation,

40% is visible range light 

46% is by infrared radiation.

Explanation

A line printer prints one entire line of text before advancing to another line.

Most early line printers were impact printers.

Line printers are mostly associated with unit record equipment

Explanation

Machine learning is a subset of artificial intelligence.

Explanation

An analog signal is a voltage, current, or physical quantity that continuously and infinitely varies in accordance with some time-varying parameter.

For example, radio waves, television waves, or sound waves are all examples of analog signals.

Explanation

The Fibonacci sequence is the series of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.

In this series, the next number is found by adding the two numbers before it.

Hence, the next term in the series is 8 + 13 = 21.

Explanation

The G-2, or Group of Two, is a relationship between the United States and China.

The term was first proposed in 2005 by C.

 was first proposed by C. Fred Bergsten 

Explanation

It is strategically located at the mouth of the Red Sea.

It is near some of the world's busiest shipping lanes and controls access to the Red Sea and Indian Ocean.

Djibouti is a key U.S. partner in regional security and humanitarian efforts.

It is a country in the Horn of Africa, bordered by Somalia

French and Arabic are its two official languages

Explanation

Operation Neptune Spear was the U.S. military operation that resulted in the death of Osama bin Laden in Pakistan in 2011:

When: May 2, 2011

Where: Abbottabad, Pakistan

Who: United States Navy SEALs of SEAL Team Six, along with other units

What: A CIA-led mission that ended a nearly decade-long manhunt for bin Laden