• A transformer is a device which is used to convert high alternate voltage to a low alternate voltage and vice versa.
• Transformer works on the principle of mutual induction of two coils.
• When the current in the primary coil is changed the flux linked to the secondary coil also changes.

• The process by which Ultra pure metal is obtained is called Zone Refining Process .

• This process was invented by William Pfann.

• This method is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal.

• The pure metal recrystallizes out of melt while the impurities remain in the melt which moves along with the melted zone of the rod with the movement of heater.

• Hip Joint is an example of Ball and Socket joint in humans.
• The ball is the femoral head, and the socket is the acetabulum.
• The hip joint is the articulation of the pelvis with the femur.
• Femur connects the axial skeleton with the lower extremity.

⇒ Calcium is a chemical element with symbol Ca and atomic number 20.
⇒ It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium.
⇒ The most common calcium compound on Earth is calcium carbonate, found in limestone and the fossilised remnants of early sea life; gypsum, anhydrite, fluorite, and apatite are also sources of calcium.

As,
5 × 4 = 20;
20 × 3.5 = 70;
70 × 3 = 210;
210 × 2.5 = 525;
525 × 2 = 1050.

Thus the next number in the series is 1050.

The second number is seven times the first number except in case of option (C)

49 × 7 = 343

21 × 7 = 147

25 × 7 = 175

But, 16 × 6 = 96

• ICC Cricket World Cup 2019 was hosted by England & Wales.

• It was the fifth time England & Wales organized this tournament in their country after organizing for 1975, 1979, 1983 and 1999 world cup tournaments.

• Blood is a connective tissue as it connects the body systems together bringing the needed oxygen, nutrients, hormones and other signalling molecules, and removing the wastes.
• It is a fluid connective tissue.

* J.J. Thomson, An English physicist who helped revolutionize the knowledge of atomic structure by his discovery of the electron (1897).

* He received the Nobel Prize for Physics in 1906 and was knighted in 1908.

• The term of office for Lokpal Chairman and Members is 5 years or till attaining age of 70 years.

• A Lokpal is an anti-corruption authority or body of ombudsman who represents the public interest in India.

• The current Chairperson of Lokpal is Pinaki Chandra Ghose (First Lokpal).

• The Lokpal is responsible for enquiring into corruption charges at the national level while the Lokayukta performs the same function at the state level.