Digital Magazine "Maths and Science Adventure" Digital Magazine "Maths and Science Adv_1st issue | Page 35

DIG IT AL
MAGA ZINE
„MA T HS
A ND
SC IENC E
ADV ENT UR E”
PAGE
35
Riddles
1.You are served a hot cup of coffee and room-temperature cream at a
restaurant. You want to wait a few minutes before you drink the coffee,
and you want it to be as hot as possible when you drink it. Should you
pour the cream in the coffee:
A) Immediately
B) Just before you drink it
C) It doesn't matter
2.It is the son of the water but when the son returns to parent, it dies.
What is it?
3.There are four gears with the following specification:
* Gear A has 60 teeth
* Gear B has 40 teeth
* Gear C has 20 teeth
* Gear D has 60 teeth
* Every minute, Gear B makes 15 complete turns.
What is the relative speed of Gear A and Gear B?
4.You are lying on a beach with a wine bottle enjoying the bright sun. After it goes empty, you friend secures the
mouth of the bottle with a cork. You can see a metal ring inside the bottle that has been suspended by a string. He
asks you if you can think of any way to drop the metal ring inside the bottle without touching the bottle or the cork.
Can you think of any way?
5.You are given two metal rods and then taken into a room. You are left there to identify which one of the metal rods
you have is a magnet. Now you have no other metal object in the room with you. Also, the two rods are exactly simi-
lar to each other in looks. What method will you use to determine which one of the rods is actually a magnet ?
6.You are given a ball and you are asked to throw it as hard as you can but it must return back to you. It is an open
ground and you can't find any wall or object in your vicinity. There is no one around to catch your ball and throw it
back to you. Also, you can't attach any string or rope with the ball.
How will you achieve it then?
7.On a boat, there is a 15 inch brick of gold and a 15 inch brick of iron. If both of them are dropped into the water,
which one of them will make the water level higher?
8.Assume a situation. There is an earthquake which is one point higher on the Richter scale than another earthquake
which is ten times powerful. Now how much powerful do you think the earthquake will be if it was just 1/2 a point
higher on the Richter scale?
9.Suppose we drop a 50 kg metal ball and a 40 kg ball of silk from a height of 100 meters. Which will reach the
ground first ?
10. H, Be, F, S, Mn, Kr, In, Gd, Tl, ? What's the next in the sequence ?
11. Agarkar was going to bleach his socks because they had gotten muddy the day before.
As he was pouring the bleach into the washing machine, he spilled some on the floor. He got some cleaning fluid
and mopped it up with a rag. Minutes later Agarkar was dead. What killed Agarkar?
Selected by Anna Zakrzewska, Poland