Question

1. ਜੇਕਰ a ਅਤੇ b ਦੋ ਪੂਰਨ ਸੰਖਿਆਵਾਂ ਹੋਣ, ਤਾਂ ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਕਥਨ ਸਹੀ ਨਹੀਂ ਹੈ? If a and b are two whole numbers, then which of the following statement is not correct? यदि a और b दो पूर्ण संख्याएँ हैं, तो निम्नलिखित में से कौन सा कथन सही नहीं है?*

a+b=b+a

ab=ba

a-b=b-a

none of these(ਇਹਨਾਂ ਵਿੱਚੋਂ ਕੋਈ ਨਹੀ)( इनमें से कोई नहीं)

2. ਕਿਹੜਾ ਵਿਅੰਜਕ ਦਿੱਤੀ ਸੰਖਿਆ ਰੇਖਾ ਦੁਆਰਾ ਹੱਲ ਕੀਤਾ ਜਾ ਸਕਦਾ ਹੈੈ? Which expression can be solved by given number line? दी गई संख्या रेखा द्वारा किस व्यंजक को हल किया जा सकता है? *



718+2040

718+204

718+240

718+402

3. ਹੇਠਾਂ ਦਿੱਤੀਆਂ ਸੰਖਿਆਵਾਂ ਵਿੱਚੋਂ ਕਿਹੜੀ ਸੰਖਿਆ ਭਾਜ ਹੈ? Which of the following numbers is composite? निम्नलिखित में से कौन सी संख्या भाज्य है? *

5

19

71

85

4. ਹੇਠਾਂ ਦਿੱਤੀਆਂ ਸੰਪੂਰਨ ਸੰਖਿਆਵਾਂ ਦਾ ਵੱਧਦਾ ਕ੍ਰਮ ਹੋਵੇਗਾ: Arrange the following numbers in ascending order: निम्नलिखित संख्याओं को बढ़ते क्रम मेँ लिखेँ: *



24,-24 ,72,48

-24,24,72,48

-24,48,24,72

-24,24,48,72

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Answer 1

Answer:

1. $a-b=b-a$                       2. 718 + 240

3. 85                                     4. -24, 24, 48, 72

Step-by-step explanation:

1. Since a and b are two whole numbers.

(i) Commutativity under addition holds, i.e.,

⇒ $a + b = b + a$

(ii) Commutativity under multiplication holds, i.e.,

⇒ ab = ba

(iii) Commutativity under subtraction does not hold for whole numbers.

Take $a=0$ and $b=1$

Then, 0 - 1 ≠ 1 - 0

⇒ -1 ≠ 1

Option (iii) is incorrect.

2.

(i) 718 + 2040 = 2758.

Thus, option (i) cannot be solved by given number line.

(ii) 718 + 204 = 922.

Thus, option (ii) cannot be solved by given number line.

(iii) 718 + 240 = 958.

⇒ 718 + 200 + 40 = 958

Thus, option (iiii) can be solved by given number line.

(iv) 718 + 402 = 1120.

Thus, option (iv) cannot be solved by given number line.

3. Numbers having more than 2 factors are composite numbers.

(i) 5 = $5$ × 1

Only two factors 1 and itself.

Thus, 5 is not a composite number.

(ii) 19 = $19$ × 1

Only two factors 1 and itself.

Thus, 19 is not a composite number.

(iii) 71 = $71$ × 1

Only two factors 1 and itself.

Thus, 71 is not a composite number.

(iv) 85 = $5$ × 17 × 1

More than two factors.

Thus, 71 is a composite number.

Option (iv) is correct.

4. A method of arranging numbers from smallest value to largest value is termed as ascending order.

Among -24, 72, 48, 24.

Smallest number is -24 and largest number is 72.

Also, 24 < 48.

So, -24, 24, 48, 72 is the ascending order.

Thus, option (iv) is correct.

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