# 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

24%

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

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

430

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

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

339

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

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

493

Such solution doesn't exist

Such solution doesn't exist

482

## 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

224

90-180

90-180

4364

0-90

0-90

153

180-360

180-360

944

## 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

1273

4/3π cm3

4/3π cm3

3572

4,3π cm3

4,3π cm3

666

It isn't possible to calculate

It isn't possible to calculate

740

## 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

89

8

8

791

6

6

5201

Not enough data

Not enough data

155

## 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

4760

0,3

0,3

399

33%

33%

903

Both answers 1/3 and 33% are correct

Both answers 1/3 and 33% are correct

3063

## 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

3719

Blaise Pascal

Blaise Pascal

1347

Isaac Newton

Isaac Newton

1371

all of the above

all of the above

1345

## 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

925

16769023

16769023

6654

38377296

38377296

851

11723835

11723835

1626

## 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

50%

999

999

422

1000

1000

567

9999

9999

3011

10000

10000

4128

## 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

5412

by approx 6 kilometers

by approx 6 kilometers

2198

by approx 60 kilometers

by approx 60 kilometers

2725

by approx 6000 kilometers

by approx 6000 kilometers

2178

## 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

7488

two

two

1874

three

three

479

four

four

388

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