• When two bodies stick together after collision, the collision is perfectly inelastic collison.

• A perfectly inelastic collision occurs when the maximum amount of kinetic energy of a system is lost.

• Insects can move on water due to surface tension of water.
• Water molecules at the surface are strongly attracted to each other which creates surface.
• Due to the surface tension, the free surface of water behaves like stretched elastic membrane which is able to support the small weight of insects and they can move on the surface of water.

• Acquired Immuno Deficiency Syndrome is caused by Virus.

• Acquired Immuno Deficiency Syndrome or AIDS, is caused by Human Immunodeficiency Virus or HIV.

• HIV is a member of the group of viruses known as retroviruses.

• HIV is spread primarily by unprotected sex, contaminated blood transfusions, hypodermic needles, and from mother to child during pregnancy, delivery, or breastfeeding.

• In 2018 about 37.9 million people were living with HIV and it resulted in 770,000 deaths.

• A circuit is considered to be closed when electricity flows from an energy source to the desired endpoint of the circuit.

• Any circuit which is not complete is considered an open circuit.

• Circuits which are manually disconnected switched off and circuits which have blown fuses, faulty wiring or missing components are all considered open circuits.

Here 17 represents male clowns are also ringmasters, but NOT acrobats.

• CAG is not a part of Union Executive.

• Articles 52 to 78 in Part V of the Constitution deal with the Union executive.

• The Union executive consists of the President, the Vice-President, the Prime Minister, the council of ministers and the attorney general.

• President is the head of Union Executive. He is the first citizen of country.

After interchanging the signs:

6 - 3 x 5 ÷ 15 + 4 = 9

6 – 15 ÷ 15 + 4 = 9

6 – 1 + 4 = 9

5 + 4 = 9

 9 = 9 (L.H.S = R.H.S)

* Osmium has the highest density with density of 22.59 g/cm³ .

* It belongs to the precious platinum group of metals.

* This shiny looking substance have as much as twice the density of lead and slightly more than that of Iridium.

* It’s mainly used in fountain pen nib and in other materials where high durability.

14 × 1 + 1 = 15

15 × 2 + 2 = 32

32 × 3 + 3 = 96 + 3 = 99

99 × 4 + 4 = 396 + 4 = 400

Logic: Row wise [(reverse of the first number + reverse of the third number) = second number]

The pattern is:

1^st Row: reverse of 32 is 23; reverse of 81 is 18. So, (23 + 18) = 41

2^nd Row: reverse of 65 is 56; reverse of 91 is 19. So, (56 + 19) = 75

Similarly,

3^rd Row: reverse of 43 is 34; reverse of 21 is 12. So, (34 + 12) = 46

So, the missing number is 46.