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BrainTeasers
100

The substance which is an alkali is

a) lemon juice

b) limewater

c) salty water

d) vinegar

b) limewater

100

When was the Xbox Series x released? (year)

2020

100

Name 4 types of engineers.

• Civil Engineers
• Mechanical Engineers
• Production Engineers
• Chemical Engineers
• Biomedical Engineers
• Aerospace Engineers
• Electical Engineers
• Environmental Engineers
• Transport Engineers
100

Solve the following equation:

3(2x-5)-3(x-10)=4(3x+1)-1

4/3

100

There are 25 red balls, 47 green balls and 3 blue balls in a basket. There is a blind man. What is the minimum number of balls that the blind man has to pick to make sure that there are at least 2 balls of different colors?

48

200

The products of photosynthesis are

oxygen and glucose

200

Originally Amazon only sold which product?

Books

200

Which frame is the strongest?

a) Triangle

b) Square

c) Rectangle

d) Hexagon

a) Triangle

200

1/9 of the shirts sold at Peter’s shop are striped. 5/8 of the remainder are printed. The rest of the shirts are plain colored shirts. If Peter’s shop has 81 plain colored shirts, how many more printed shirts than plain colored shirts does the shop have?

54

200

Find the next three letters in the series FTNTL.

I, T, S.

The complete sequence is the first letter of every word in the sentence.

300

The unit used to measure energy is the

joule

300

Which is not used for general data storage?

a) CPU

b) Hard disc

c) Magnetic tape

d) Optical disc

a) CPU

300

A transparent material is see-through. What is its opposite called?

a) Block

b) Hidden

c) Opaque

d) Solid

c) Opaque

300

The mean of four positive integers is 5. The median of the four integers is 6. What is the mean of the largest and smallest of the integers?

A) 3 B) 4 C) 5 D) 6 E) 8

B) 4

300

A bat and a ball cost \$1.10. The bat costs one dollar more than the ball. How much does the ball cost?

The ball costs 5 cents.

One dollar more than 5 cents is \$1.05, the sum of which is \$1.10.

400

Fill in the blanks.

The law of ___________ of energy states that energy can not be ____________ or __________

A. Properties, seen, heard.

B. Conservation, created, destroyed.

C. Conservation, created, discovered.

D. Properties, felt, smelt.

B. Conservation, created, destroyed.

400

The first person to journey into space

Yuri Gagarin

400

Resistant materials that are designed to break down naturally are known as what?

Biod___________

400

Four different positive integers have a product of 110. What is the sum of the four integers?

19

110 = 1 × 2 × 5 × 11.

1 + 2 + 5 + 11 = 19

400

If:

2 + 2 = 44

3 + 3 = 96

4 + 4 = 168

5 + 5 = 2510

Then:

6 + 6 = ?

3612

The answer is the number multiplied by itself and then the number added to itself. Six multiplied by six is 36, and six plus six is 12.

500

Most of the elements in the periodic table are.....

a) Gases

b) Liquids

c) Metals

d) Non metals

c) Metals

500

What does DVD stand for?

a) Digital Verifiable Disc

b) Digital Versatile Disc

c) Digital Videorecorder Data

d) Digital Video Disc

b) Digital Versatile Disc

500

Who invented the airplane?

Wright brothers

Orville and Wilbur Wright

500

A group of 42 children all play tennis or football, or both sports. The same number play tennis as play just football. Twice as many play both tennis and football as play just tennis. How many of the children play football?

35

500

There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of its box. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, how can you immediately label all of the boxes correctly?

Go to the box labeled “Apples + Oranges.” Since the label is wrong, it must have one or the other.

This is the box to take one piece of fruit from. Whichever comes out is what that box contains. If you took out an apple, the box has only apples. If you took out an orange, vice versa.

Here’s where it gets tricky a bit tricky. But we’re almost done…

Let’s say you grabbed an apple. Move the “Apples” label over to that box. Now it’s correctly labeled.

You know the “Oranges” box is still labeled wrong (because all 3 were labeled wrong to start and you haven’t touched it). And you know it’s not “Apples”.

So it has to be “Apples + Oranges”.

The last box is “Oranges”.

The same process above would work if you had pulled out an orange at the start.

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