1
AP EAPCET 2022 - 4th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The vectors $$3 \mathbf{a}-5 \mathbf{b}$$ and $$2 \mathbf{a}+\mathbf{b}$$ are mutually perpendicular and the vectors $$a+4 b$$ and $$-\mathbf{a}+\mathbf{b}$$ are also mutually perpendicular, then the acute angle between $$\mathbf{a}$$ and $$\mathbf{b}$$ is

A
$$\cos ^{-1}\left(\frac{19}{5 \sqrt{43}}\right)$$
B
$$\cos ^{-1}\left(\frac{9}{5 \sqrt{43}}\right)$$
C
$$\pi-\cos ^{-1}\left(\frac{19}{5 \sqrt{43}}\right)$$
D
$$\pi-\cos ^{-1}\left(\frac{9}{5 \sqrt{43}}\right)$$
2
AP EAPCET 2022 - 4th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Let $$\mathbf{a}=x \hat{i}+y \hat{j}+z \hat{k}$$ and $$x=2 y$$. If $$|\mathbf{a}|=5 \sqrt{2}$$ and a makes an angle of $$135^{\circ}$$ with the Z-axis, then $$\mathbf{a}=$$

A
$$2 \sqrt{3} \hat{i}+\sqrt{3} \hat{j}-3 \hat{k}$$
B
$$2 \sqrt{6} \hat{i}+\sqrt{6} \hat{j}-6 \hat{k}$$
C
$$2 \sqrt{5} \hat{i}+\sqrt{5} \hat{j}-5 \hat{k}$$
D
$$2 \sqrt{5} \hat{i}+\sqrt{5} \hat{j}+5 \hat{k}$$
3
AP EAPCET 2022 - 4th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Let $$\mathbf{a}, \mathbf{b}, \mathbf{c}$$ be the position vectors of the vertices of a $$\triangle A B C$$. Through the vertices, lines are drawn parallel to the sides to form the $$\Delta A^{\prime} B^{\prime} C^{\prime}$$. Then, the centroid of $$\Delta A^{\prime} B^{\prime} C^{\prime}$$ is

A
$$\frac{a+b+c}{9}$$
B
$$\frac{a+b+c}{6}$$
C
$$\frac{a+b+c}{3}$$
D
$$\frac{2(a+b+c)}{3}$$
4
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

The position vectors of the points $$A$$ and $$B$$ with respect to $$O$$ are $$2 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}+\hat{\mathbf{k}}$$ and $$2 \hat{\mathbf{i}}+4 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}$$. The length of the internal bisector of $$\angle B O A$$ of $$\triangle A O B$$ is (take proportionality constant is 2)

A
$$\frac{\sqrt{136}}{9}$$
B
$$\frac{\sqrt{136}}{3}$$
C
$$\frac{20}{3}$$
D
$$\frac{25}{3}$$
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