Multiplication of Integers

Q. What is the value of the following expression?
$20\times 19+(-5)\times 7$

1. $345$
2. $335$
3. $355$
4. $235$

Q.

Statement 1: Product of two integers with same signs is always a positive integer.

Statement 2: Product of two integers with different signs is always a positive integer.

Choose the correct option:

1. Statement 1 is incorrect but statement 2 is correct

2. Both the statements are correct

3. Both the statements are incorrect

4. Statement 1 is correct but statement 2 is incorrect

Q.

What is $(-7)\times (-13)$?

1. 19 × (7 + 3 + 9 + 2)

2. 19 × 10 + 19 × 11

3. 19 × 10 + 11

4. 19 × 7 + 19 × 3 + 19 × 9 + 19 × 2

Q. $(-4)\times (-2)\times 4=?$

1. -32
2. 16
3. -16
4. 32

Q. The product of -140 and 8 is:

1. -1000
2. -1200
3. -1120
4. -1222

Q. In a test (+5) marks are given for every correct answer and (-2) marks are given for every incorrect answer and 0 for questions that are not attempted. Ram gets 3 correct and 4 incorrect out of 7 questions he attempted. What is his final score?

1. -2
2. -2
3. -7
4. 7

Q. The temperature at 12 noon was 10${}^{\circ }$C above zero. If it decreases at the rate of 2 ${}^{\circ }$C per hour until midnight, what would be the temperature at 9 p.m.?

1. 8${}^{\circ }$C
2. -8${}^{\circ }$C
3. -6${}^{\circ }$C
4. 6${}^{\circ }$C

Q.

In a class test containing 10 questions, 3 marks are awarded for every correct answer, (-1) mark is awarded for every incorrect answer and 0 for the questions not attempted. Srinu gets two correct and six incorrect answers out of eight questions he attempted. What is his total score?

1. 6

2. 0

3. -2

4. 2

Q. What should be multiplied by (-12) in order to get 180?

1. 15
2. -16
3. -15
4. 16

Q. A certain freezing process requires that room temperature should be lowered from 40${}^{\circ }$C at the rate of 5${}^{\circ }$C every hour. What is the room temperature after 10 hours?

1. 0${}^{\circ }$C
2. -5${}^{\circ }$C
3. -10${}^{\circ }$C
4. -15${}^{\circ }$C