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If |veca xx vecb|^2+(veca*vecb)^(2)=196 ...

If `|veca xx vecb|^2+(veca*vecb)^(2)=196` and `|vecb|=2`, then the value of `|veca|` is -

A

7

B

6

C

5

D

4

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The correct Answer is:
A
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 7
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  2. If the vectors vec alpha=hati+3hatj+hatk, vec beta=2hati-hatj-hatk an...

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  3. If |veca xx vecb|^2+(veca*vecb)^(2)=196 and |vecb|=2, then the value o...

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  4. If e^(y)+xy=e^(2) then the value of (d^(2)y)/(dx^(2)) at x=0 is -

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  5. Derivative of sin^(-1)x w.r.t. cos^(-1) sqrt(1-x^(2)) is -

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  6. If x=a(theta+sin theta), y=a(1-cos theta), then the value of (dy)/(d...

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  7. The equation ax^(2)+bx+c=0 has one real root between 0 and k. If 4a...

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  8. If lim(x to oo) [ (x^(3)+1)/(x^(2)+1)-(ax+b)]=2, then the values of a ...

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  9. Let f(x) be continuous in (-oo, oo) and f'(x) exists in (-oo, oo). If...

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  10. The value of lim(x to 0) (1-3x)^((3)/(x)) is equal to -

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  11. If y=2sin^(- 1)((x-2)/sqrt(6))-sqrt(2+4x-x^2) then prove that dy/dx at...

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  12. If f(x)=tan^(-1)((3x-x^(3))/(1-3x^(2))) and phi(x)=cos^(-1)((1-x^(2)...

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  13. If y=sec(tan^(-1)x), then (dy)/(dx) is equal to -

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  14. If y=e^(x+e^(x+e^(x+...oo)), then the value of (dy)/(dx) is -

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  15. If y=(x sin^(-1)x)/(sqrt(1-x^(2)))+logsqrt(1-x^(2)), then the value o...

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  16. For |x| lt 1, let y=1+x+x^(2)+…oo, then the value of (dy)/(dx)-y is e...

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  17. Observe the following statements : (i) f(x)=ax^(41)+bx^(-40) rArr (f'...

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  18. If f(y)=e^(y), g(y)=y, y gt 0 and F(t)=int(0)^(t) f(t-y)g(y)dy, then ...

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  19. If m, n in R, then the value of I(m,n)=int(0)^(1) t^(m)(1+t)^(n)dt is...

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  20. The value of int(-2)^(2)[p log((1+x)/(1-x))+q log ((1-x)/(1+x))^(-2)+...

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