Playing with Numbers Test

Result

Playing with Numbers Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Statement-I: 1 is a factor of every number.

Statement-II: 2 is the first prime number.

Which of the following options is correct?

A
I only

B
II only

C
Both I and II

D
Neither I nor II

Solution

Statement-I Every number other than 1 has at least two factors, namely the number itself and 1

Statement-II the first few prime numbers: 2, 3, 5, 7, 11
Question 2
1 / -0

What is the L.C.M. of 17 and 5?

A
105

B
95

C
85

D
5

Solution

The least common multiple (LCM) of two numbers is the smallest number (not zero) that is a multiple of both.
Question 3
1 / -0

What is the greatest number that divides 37,50 and 123 leaving remainders 1,2 and 3 respectively?

A
9

B
10

C
15

D
12

Solution

37-1=36, 50-2=48,123-3=120

H.C.F. of 36, 48 and 120 =12 ∴The required number =12
Question 4
1 / -0

What is the H.C.F. of two co-prime numbers?

A
1

B
0

C
2

D
4

Solution

H.C.F. of two co-prime numbers is 1.
Question 5
1 / -0

A number is always divisible by 90 if

A
it is divisible by both 2 and 45.

B
it is divisible by both 5 and 18.

C
it is divisible by both 9 and 10.

D
All the above.

Solution

90 = 10*9, two relatively prime numbers. This a number is divisible by 90 iff it is divisible by 9 and 10
Question 6
1 / -0

What is the H.C.F. of 17 and 5?

A
1

B
5

C
17

D
85

Solution

Highest Common Factor(HCF) of two or more numbers is the greatest number which divides each of them exactly.
Question 7
1 / -0

What is the number of prime numbers between 50 and 60?

A
1

B
2

C
3

D
4

Solution

prime numbers between 50 and 60: [53 and 59]
Question 8
1 / -0

Which of the following numbers is a perfect number?

A
6

B
28

C
6 and 28

D
34

Solution

A perfect number has the sum of all its factors equal to twice itself.

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Re-Attempt Weekly Quiz Competition

Playing with Numbers Test - 4

Result

Playing with Numbers Test - 4

Score

-

Rank

-

SHARING IS CARING

Question 1

I only

II only

Both I and II

Neither I nor II

Solution

Question 2

105

95

85

5

Solution

Question 3

9

10

15

12

Solution

Question 4

1

0

2

4

Solution

Question 5

it is divisible by both 2 and 45.

it is divisible by both 5 and 18.

it is divisible by both 9 and 10.

All the above.

Solution

Question 6

1

5

17

85

Solution

Question 7

1

2

3

4

Solution

Question 8

6

28

6 and 28

34

Solution

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