Grade 7 : Mathematics (Ganita Prakash) - 10. Integers (Set 5) | Concept of Maths

Question 1

A submarine is at a depth of 450 m below sea level. It ascends 120 m and then descends 280 m. What is its final position relative to sea level?

Accepted Answer

C) -610 m

Answer

A) -330 m

Answer

B) -850 m

Answer

D) -50 m

Question 2

If $a imes (-12) = 144$ and $b \div (-5) = -20$, find the value of $a + b$.

Accepted Answer

B) 88

Answer

A) 112

Answer

C) -112

Answer

D) -88

Question 3

An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 20 m above the ground level, how long will it take to reach -370 m?

Accepted Answer

A) 65 minutes

Answer

B) 60 minutes

Answer

C) 58 minutes

Answer

D) 72 minutes

Question 4

Evaluate the expression using distributive property: $15625 imes (-2) + (-15625) imes 98$

Accepted Answer

D) -1,562,500

Answer

A) 1,500,000

Answer

B) -15,625

Answer

C) -1,500,000

Question 5

In a competitive exam, +5 marks are given for every correct answer and -2 marks are given for every incorrect answer. Rohan answered all questions and scored 30 marks though he got 10 correct answers. How many incorrect answers did he give?

Accepted Answer

B) 10

Answer

A) 5

Answer

C) 15

Answer

D) 20

Question 6

Which of the following statements is FALSE regarding integers?

Accepted Answer

C) Subtraction of integers does NOT follow the commutative property.

Answer

A) The product of an even number of negative integers is positive.

Answer

B) Subtraction of integers follows the commutative property.

Answer

D) 0 is the additive identity for integers.

Question 7

Find the value of $x$ in the equation: $[(-15) + x] imes (-4) = 100$

Accepted Answer

A) -10

Answer

B) 10

Answer

C) -40

Answer

D) 40

Question 8

At sunrise, the temperature was $12^\circ ext{C}$ below zero. By noon, it rose by $25^\circ ext{C}$ and by midnight it fell by $18^\circ ext{C}$. What was the temperature at midnight?

Accepted Answer

C) $-5^\circ	ext{C}$

Answer

A) $-31^\circ	ext{C}$

Answer

B) $19^\circ	ext{C}$

Answer

D) $5^\circ	ext{C}$

Question 9

What is the value of $[(-24) \div 8] \div [(-12) \div 4]$?

Accepted Answer

D) 1

Answer

A) -1

Answer

B) 9

Answer

C) -3

Question 10

If the product of 15 negative integers and 2 positive integers is calculated, what will be the sign of the product?

Accepted Answer

B) Negative

Answer

A) Positive

Answer

C) Zero

Answer

D) Cannot be determined