Olympiad Test: Integers

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Description

This mock test of Olympiad Test: Integers for Class 7 helps you for every Class 7 entrance exam. This contains 20 Multiple Choice Questions for Class 7 Olympiad Test: Integers (mcq) to study with solutions a complete question bank. The solved questions answers in this Olympiad Test: Integers quiz give you a good mix of easy questions and tough questions. Class 7 students definitely take this Olympiad Test: Integers exercise for a better result in the exam. You can find other Olympiad Test: Integers extra questions, long questions & short questions for Class 7 on EduRev as well by searching above.

QUESTION: 1

−4 × (7) = ?

A.
28
B.
-28
C.
7
D.
4

Solution:

−4 × (7) = -28 [∵ (-) x (+) = (-)]

QUESTION: 2

−45 ÷ 9 = ?

A.
9
B.
5
C.
-5
D.
None of these

Solution:

−45 ÷ 9 = −5

QUESTION: 3

−5 × (−6) =?

A.
5
B.
-30
C.
6
D.
30

Solution:

In this question, we have to multiply the integers with the same negative sign.

-5 x -6 = 30 [∵ (-) x (-) = +]

In multiplication, we have to multiply the sign of the integers also and then assign the obtained sign to the answer.
Negative sign multiplied by negative sign gives an overall positive sign.

QUESTION: 4

Which of the following is true?

A.
(- 8) + (- 4) > (- 8) – (- 4)
B.
(-8) + (- 4) = (- 8) – (- 4)
C.
(- 8) + (- 4) < (- 8) – (- 4)
D.
None of these

Solution:

LHS: (-8) + (-4) = -12
RHS: (-8) – (-4) = -4
⇒ -12 < -4 i.e. LHS<RHS
⇒ (- 8) + (- 4) < (- 8) – (- 4)

Thus, option C is correct.

QUESTION: 5

The sum of two integers is -112. If one of them is -109 the other is:

A.
-121
B.
3
C.
-3
D.
None of these

Solution:

Let other number be x.
⇒ x + (-109) = -112
⇒ x = -112 + 109 = -3

QUESTION: 6

10 × (−3) = ?

A.
7
B.
30
C.
-30
D.
None of these

Solution:

10 × (−3) = -30 [∵ (+) x (-) = -]

QUESTION: 7

Difference between 43°C and -17°C is:

A.
-26°C
B.
60°C
C.
-60°C
D.
26°C

Solution:

43 - (-17) = 60

QUESTION: 8

−67 × (−1) = ?

A.
-1
B.
-67
C.
67
D.
1

Solution:

-67 x (-1) = 67 [∵ (-) x (-) = +]

QUESTION: 9

A place is 45 metre above sea level and another place is 25 meter below sea level. What is the difference of level in metres between the two places?

A.
60
B.
20
C.
70
D.
-20

Solution:

45 m above sea level = +45
25 m below sea level = -25
Therefore, 45 - (-25) = 70

QUESTION: 10

−2 × (−1) = ?

A.
1
B.
-2
C.
2
D.
0

Solution:

-2 x (-1) = 2 [∵ (-) x (-) = +]

QUESTION: 11

25 ÷ −5 = ?

A.
5
B.
0
C.
1
D.
-5

Solution:

25 ÷ -5 = - 5 [∵ (+/-) = -]

QUESTION: 12

At Shimla, temperature was -5°C on Monday and then it dropped by 2^°C on Tuesday. What was the temperature of Shimla on Tuesday?

A.
-7^°C
B.
-3^°C
C.
3^°C
D.
7^°C

Solution:

Temperature on Monday = -5°C
Temperature on Tuesday = Temperature on Monday - 2°C = -5°C - 2°C = -7°C

QUESTION: 13

6 × (−15 + 10) = ______

A.
30
B.
-21
C.
-30
D.
21

Solution:

According to BODMAS,
6 × (−15 + 10) = 6 × (-5) = -30
[∵ -15 + 10 = -5]

QUESTION: 14

(-1) × (-1) × (-1) × ......... (2m + 1) times, where m is a natural number, is equal to:

A.
1
B.
-1
C.
1 or -1
D.
none of these

Solution:

If negative terms are multiplied odd times, then the result will always be negative.

Thus option B is correct.

QUESTION: 15

Manish deposits Rs 2000 in his bank account and withdraws Rs 1000 from it, the next day. Find the balance in Manish’s account after the withdrawal.

A.
Rs 2000
B.
Rs 3000
C.
Rs 1000
D.
None of these

Solution:

Manish deposits amount = 2000
Manish withdraws amount = -1000
Balance of Manish's account = 2000 + (-1000) = Rs 1000

Thus option C is correct.

QUESTION: 16

−(−2) × (3 + 5) = ________

A.
-16
B.
-10
C.
10
D.
16

Solution:

According to BODMAS,
- (-2) × (3 + 5) = 2 x 8 = 16

QUESTION: 17

Which of the following statements is wrong?

A.
When a positive integer and a negative integer are added, we always get a negative integer.
B.
The additive inverse of 8 is (-8).
C.
The additive inverse of (-8) is 8.
D.
For subtraction, we add the additive inverse of the integer that is being subtracted, to the other integer.

Solution:

When a positive integer and a negative integer are added, we may either get a negative integer or positive integer.
Example:
5 + (-2) = 3
2 + (-5) = -3

QUESTION: 18

(−12 - 3) ÷ (− 6 + 3) = _________