Which of the following quantities are vectors-1- 70 cm 32-5 m - s3- 8 m - s NE4- 70 cm to the right5-25- C6- 30 N forceA- All of themB- None of themC- 1-2-5 and 6D- 3-4

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Standard VII

Mathematics

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Which of the ...

Question

Which of the following quantities are vectors.

All of them

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1, 2, 5 and 6

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3, 4

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None of them

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Solution

The correct option is C
3, 4

A vector has both magnitude and direction.

70 $c m^{3}$ – Volume – No direction, only magnitude

5 m/s – speed – Direction not specified

8 m/s NE – Speed 8 m/s + Direction which is North East. So a vector quantity.

70 cm to the right - Magnitude = 70 cm Direction – To the right Hence a vector quantity

$25^{\circ} C$ – Temperature – Only magnitude no direction

30 N (force) – The direction in which the force is applied has not been specified So it’s not a vector.

Suggest Corrections

Similar questions

Which of the following are correct?

(1) cot(A+B) = $\frac{c o t A c o t B - 1}{c o t A + c o t B}$

(2) cot(A-B) = $\frac{c o t A c o t B - 1}{c o t A - c o t B}$

(3) tan(A+B) = $\frac{t a n A + t a n B}{1 - t a n A t a n B}$

(4) tan(A-B) = $\frac{t a n A - t a n B}{1 - t a n A t a n B}$

Let A = {1, 2, {3, 4}, 5}. Which of the following statements are incorrect and why?

(i) {3, 4} $\subset$ A (ii) {3, 4} $\in$ A

(iii) {{3, 4}} $\subset$ A (iv) $1 \in A$

(v) $1 \subset A$ (vi) {1, 2, 5} $\subset$ A

(vii) {1, 2, 5} $\in$ A (viii) {1, 2, 3} $\subset$ A

(ix) $Φ \in A$ (x) $Φ \subset A$

(xi) { $Φ$ } $\subset$ A.

Q. Let

A = {1, 2, {3, 4}, 5}

. Which of the following statements are incorrect and why?

(i) {3, 4} \subset A (i i) {3, 4} \in A

(i i i) {{3, 4}} \subset A (i v) 1 \in A

(v) 1 \subset A (v i) {1, 2, 5} \subset A

(v i i) {1, 2, 5} \in A (v i i i) {1, 2, 3} \subset A

(i x) ϕ \in A (x) ϕ \subset A

(x i) {ϕ} \subset A

Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why?

(i) {3, 4}⊂ A

(ii) {3, 4}}∈ A

(iii) {{3, 4}}⊂ A

(iv) 1∈ A

(v) 1⊂ A

(vi) {1, 2, 5} ⊂ A

(vii) {1, 2, 5} ∈ A

(viii) {1, 2, 3} ⊂ A

(ix) Φ ∈ A

(x) Φ ⊂ A

(xi) {Φ} ⊂ A

Q. Let A= {1, 2, {3, 4,}, 5}. Which of the following statements are incorrect and why? (i) {3, 4}⊂ A (ii) {3, 4}}∈ A (iii) {{3, 4}}⊂ A (iv) 1∈ A (v) 1⊂ A (vi) {1, 2, 5} ⊂ A (vii) {1, 2, 5} ∈ A (viii) {1, 2, 3} ⊂ A (ix) Φ ∈ A (x) Φ ⊂ A (xi) {Φ} ⊂ A

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