# Mathematics questions

This is a list of recently added questions about mathematics. Play mathematics quiz and see all the questions.## Which of the following is true for the solution with the pH=0?

The OH − ion concentration is smaller than the H+ ion concentration. In chemistry, pH is a numeric scale used to specify the acidity or alkalinity of an aqueous solution. It is the negative of the logarithm to base 10 of the activity of the hydrogen ion .Traditionally the pH is being defined as: pH = - log10 [H+], where [H+] it is a H+ ions concentration in mol/dm^3 (M). So if pH = 0 this H+ ions concentration is 1 mol/dm^3 and the solution is strongly acidic.

Created by: Paweł Kołodziejczyk

very hard

25%

the OH − ion concentration is smaller than the H+ ion concentration

the OH − ion concentration is smaller than the H+ ion concentration

478

the OH − ion concentration is greater than the H+ ion concentration

the OH − ion concentration is greater than the H+ ion concentration

365

the OH − ion concentration is equal of the H+ ion concentration

the OH − ion concentration is equal of the H+ ion concentration

535

Such solution doesn't exist

Such solution doesn't exist

526

## How many degrees an obtuse angle can have ?

90-180. The obtuse angle may measure from 90 to 180 degrees. Angles having a degree of 0 to 90 are acute angles, whereas those from 180 to 360 - concave angles.

Created by: TotalBellend

easy

76%

0-360

0-360

247

90-180

90-180

4861

0-90

0-90

164

180-360

180-360

1041

## What is the volume of a soap bubble with radius R=1 cm?

4/3π cm3. Equation for the volume of a sphere: 4/3πR^3.

Created by: Paweł Kołodziejczyk

hard

57%

3/4π cm3

3/4π cm3

1416

4/3π cm3

4/3π cm3

4055

4,3π cm3

4,3π cm3

733

It isn't possible to calculate

It isn't possible to calculate

834

## What is the result of 2+2*2?

6. The multiplication has a priority over addition, and so the result is 2+(2*2) = 2+4 = 6.

Created by: Paweł Kołodziejczyk

very easy

83%

4

4

108

8

8

881

6

6

5800

Not enough data

Not enough data

172

## Which of the following numbers is the greatest?

1/3. Quite surprisingly, most players answer that both answers 1/3 and 33% are correct. But 1/3 is more than 33%. (it is 33.3333333...)

Created by: globalquiz.org

hard

52%

1/3

1/3

5192

0,3

0,3

433

33%

33%

979

Both answers 1/3 and 33% are correct

Both answers 1/3 and 33% are correct

3262

## Which famous scientist was born on the Pi day? (March 14)

Albert Einstein. 14 of March is celebrated on many schools and universities as both Pi Day and the birthday of Albert Einstein. On of the traditions is the 'Pi Pie' (pictured).

Created by: globalquiz.org

hard

47%

Albert Einstein

Albert Einstein

3981

Blaise Pascal

Blaise Pascal

1440

Isaac Newton

Isaac Newton

1448

all of the above

all of the above

1430

## Which of the following is a prime number?

16769023. A prime number has no positive divisors other than 1 and itself. Hence, a prime bigger than 2 cannot be even. All prime numbers bigger than 5, written in the usual decimal system, end in 1, 3, 7, or 9.

Created by: Sumit Tamang

average

66%

23882990

23882990

964

16769023

16769023

7118

38377296

38377296

910

11723835

11723835

1712

## How many possible code combinations are there for this kind of lock?

10000. The possible codes are from 0000 to 9999 inclusive.

Created by: Teddy

hard

51%

999

999

448

1000

1000

598

9999

9999

3210

10000

10000

4431

## If Earth's radius was larger by 1 meter, how much longer would its equator be?

By approx 6 meters. For each circle, the length of the circumference is c=2πr. Hence, if a radius grows by 1 meter, the circumference grows by 2 π meters - no matter what the initial value of radius was.

Created by: SpikeMe

hard

43%

by approx 6 meters

by approx 6 meters

5976

by approx 6 kilometers

by approx 6 kilometers

2377

by approx 60 kilometers

by approx 60 kilometers

2926

by approx 6000 kilometers

by approx 6000 kilometers

2350

## How many edges does a Möbius strip have?

One. The Möbius strip is a surface with only one side and only one boundary component (edge). A line drawn starting from the seam down the middle will meet back at the seam but at the "other side". If continued the line will meet the starting point and will be double the length of the original strip.

Created by: globalquiz.org

easy

73%

one

one

7926

two

two

1977

three

three

505

four

four

414

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