Answer: C) 20th March Explanation: The International Day of Happiness (known as Happiness Day) is celebrated throughout the world on the 20th of March. The International Day of Happiness was founded on June 28, 2012, by the United Nations General Assembly when all 193 member states unanimously adopted UN resolution 66/281. It was celebrated for the first time in 2013.

Answer: D) Barometer Explanation: Air Pressure can be defined as the pressure of air in the earth's atmosphere. It reaches a maximum of about 100,000 Pa near sea level and decreases as altitude increases. The barometer is an instrument which is used for measuring Air pressure.   Physics instruments and their uses:   Barkometer  - - - Tanning liquors used in tanning leather Bolometer  - - - Electromagnetic radiation Spectrometer - - -  Properties of light.

Answer: D) 14 cm Explanation: circumference of a circle = 2πr   => 2 × 22/7 × r – r = 37   => 37/7 × r = 37   => r = 7 cm.   Diameter D = 2r = 7×2 = 14 cm.

Answer: C) The cell grows Explanation: The cell carries out the metabolic processes and it grows during interphase. The cell cycle has three phases that must occur before mitosis, or cell division happens. These three phases are collectively known as interphase. They are G1, S, and G2.

Answer: D) 23 Explanation: As month begins on Saturday, so 2nd, 9th, 16th, 23rd, 30th days will be Sundays. While 8th and 22nd days are second Saturdays. Thus, there are 7 holidays in all. Hence, no. of working days = 30 – 7 =23

The distance around a circle is called as Circumference. And that in the case of square or rectangle it is called as Perimeter.

Answer: C) 1/4 Explanation: Non collision can happen only when all the cars move in same direction. That is either all cars moving in clockwise direction or all cars moving in anti clockwise direction.P(all cars not colliding) = P(all cars moving in the same direction) = P(all cars moving in clockwise direction)  +  P(all cars moving in anticlockwise direction) = [p(A --> C) x p(C --> B) x p(B --> A)]  +  [p(A --> B) x p(B --> C) x p(C --> A)] = [1/2 x 1/2 x 1/2] + [1/2 x 1/2 x 1/2] = 1/8 + 1/8 = 1/4

Answer: D) Cuba Explanation: Havana is the capital city of Cuba. It's currency is Cuban Peso.