IQ & EQ Club

Three U.S-born scientists win 2017 Nobel Prize for Medicine

Which state imposed a weight limit of 5 kg on school bags of children studying in classes below X

A) AP
B) Telangana
C) UP
D) MP

Answer: B

General Knowledge on Twitter “Which state imposed a weight limit of 5 kg on school bags of children studying in classes below X A) AP B) Telangana C) UP D) MP Answer: B”

To honour whom, DoctorsDay celebrated in India
- Dr Bidhan Chandra Roy

Name the Indian-origin 11-years boy who has scored higher in an (162) IQ test than AlbertEinstein and StephenHawking ?

Which social network join hands vt for Voter Registration Reminder

A)
B)
C)

GSTrates

India-28%
Australia-10%
Canada-15%
China-17%
Japan-8%
New Zealand-15%
Russia-18%
South Africa-14%
UAE-5%
USA-7.5%
Singapore-7%

Who is the first Governor General of India?

[A] Robert Clive
[B] William Bentinck
[C] Warren Hastings
[D] Wellesley

Reply Answer ✍

A Box of Defective Balls

You have 10 boxes of balls (each ball weighing exactly10 gm) with one box with defective balls (each one of the defective balls weigh 9 gm). You are given an electronic weighing machine and only one chance at it. How will find out which box has the defective balls?

Answer:

For convenience sake,

Lets name the boxes from 1 to 10.

In order to solve this problem, you have to leverage the fact that you know exactly what each good ball is supposed to weigh and what each defective ball is supposed to weigh. Many of us instinctively will take one ball out of each box and try to find a way to make it work but the trick to take different number of balls from each box.

The number of balls you pick from each bag is equal to the box number. For example, pick 1 ball from box 1, 2 balls from box 2 and so on. In total you will have 55 balls. If all of the boxes have good balls, then the total weight of these balls would be 550gm.

If box 1 has defective balls, then the total weight should be 1gm less than expected (only one ball weighing 9 gm). If box 2 has defective balls, then the total weight should be 2gm less than expected (two balls weighing 9 gm).

So once you weigh the set of chosen balls, find out the difference between the total weight and the expected weight. That number represents the box number which contains the defective balls.

A Box of Defective Balls

You have 10 boxes of balls (each ball weighing exactly10 gm) with one box with defective balls (each one of the defective balls weigh 9 gm). You are given an electronic weighing machine and only one chance at it. How will find out which box has the defective balls?

Which country has unveiled the world’s first railless train that runs on a virtual track ?

A) Russia
B) Germany
C) Japan
D) China