# Mathematics questions

This is a list of recently added questions about mathematics. Play mathematics quiz and see all the questions.## Which numeral system was in use in ancient Sumer and Babilon?

Sexagesimal. Remnants of highly composite sexagesimal system are in use even today for measuring angles, geographic coordinates and especially time. An hour of time is divided into 60 minutes, which in turn are divided into 60 seconds.

Created by: smyru

very hard

32%

octal

octal

1983

binary

binary

1798

decimal

decimal

2367

sexagesimal

sexagesimal

2921

## 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

520

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

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

396

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

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

567

Such solution doesn't exist

Such solution doesn't exist

558

## 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

77%

0-360

0-360

274

90-180

90-180

5276

0-90

0-90

175

180-360

180-360

1122

## 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

5632

0,3

0,3

466

33%

33%

1053

Both answers 1/3 and 33% are correct

Both answers 1/3 and 33% are correct

3477

## 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

48%

Albert Einstein

Albert Einstein

4214

Blaise Pascal

Blaise Pascal

1519

Isaac Newton

Isaac Newton

1510

all of the above

all of the above

1505

## 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

1020

16769023

16769023

7495

38377296

38377296

962

11723835

11723835

1780

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

10000. The possible codes are from 0000 to 9999 inclusive. There are 10 possibilities for each ring, thus there are 10*10*10*10 possible codes.

Created by: Teddy

hard

51%

999

999

470

1000

1000

626

9999

9999

3398

10000

10000

4771

## 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

44%

by approx 6 meters

by approx 6 meters

6638

by approx 6 kilometers

by approx 6 kilometers

2560

by approx 60 kilometers

by approx 60 kilometers

3131

by approx 6000 kilometers

by approx 6000 kilometers

2513

Play mathematics quiz and see all the questions.