Answer: C) 6.7 per cent Explanation:

Answer: B) Father & Daughter Explanation:

Answer: B) 24 kmph Explanation: Total time taken = k/40 + 2k/20 hours = 5k/40 = k/8 hours Average speed = 3k/(k/8) = 24 kmph.

Answer: D) All the above Explanation: The study of statistics such as births, deaths, income, or the incidence of disease, which illustrate the changing structure of human populations.   In brief, Study of both quantitative and qualitative aspects of human population. 1. Quantitative aspects include composition, density, distribution, growth, movement, size, and structure of the population. 2. Qualitative aspects are the sociological factors such as education quality, crime, diet, development, nutrition, wealth and well being.

Answer: C) 41 sec Explanation: Speed = 44 kmph x 5/18 = 110/9 m/s We know that, Time = distance/speed Time = (360 + 140) / (110/9) = 500 x 9/110 = 41 sec.

Answer: A) Neeraj Chopra Explanation: Neeraj Chopra became the first Indian javelin thrower to claim a gold medal at the Commonwealth Games, with a season’s best effort of 86.47m in the final. The 20-year-old junior world champion had made the final after achieving the qualifying mark in his very first throw.

Answer: D) 248 yrs Explanation: It takes 248 yrs for Pluto to orbit the Sun.

Answer: B) 3.5% Explanation: Seawater or salt water is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5% or 35 parts per thousand. This means that for every 1 litre (1000 mL) of seawater there are 35 grams of salts dissolved in it.   Hence, The average salinity of seawater is 3.5%.