1
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

If $$\mathbf{a}+\mathbf{b}+\mathbf{c}=0$$ and $$|\mathbf{a}|=7,|\mathbf{b}|=5,|\mathbf{c}|=3$$ then the angle between $$\mathbf{b}$$ and $$\mathbf{c}$$ is

A
$$30^{\circ}$$
B
$$45^{\circ}$$
C
$$60^{\circ}$$
D
$$90^{\circ}$$
2
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

If $$P$$ and $$Q$$ are two points on the curve $$y=2^{x+2}$$ in the rectangular cartesian coordinate system such that $$\mathbf{O P} \cdot \hat{i}=-1, \mathrm{OQ} \cdot \hat{i}=2$$, then $$\mathrm{OQ}-4 \mathrm{OP}=$$

A
$$3 \hat{i}+8 \hat{j}$$
B
$$4 \hat{i}+6 \hat{j}$$
C
$$6 \hat{i}+8 \hat{j}$$
D
$$4 \hat{i}+3 \hat{j}$$
3
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

In quadrilateral $$A B C D, \mathbf{A B}=\mathbf{a}, \mathbf{B C}=\mathbf{b}$$. $$\mathbf{D A}=\mathbf{a}-\mathbf{b}, M$$ is the mid-point of $$B C$$ and $$X$$ is a point on DM such that, $$\mathbf{D X}=\frac{4}{5}$$ DM. Then, the points $$A, X$$ and $$C$$.

A
form an equilateral triangle.
B
are collinear
C
form an isosceles triangle
D
form a right angled triangle
4
AP EAPCET 2022 - 4th July Morning Shift
+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
$$\pi-\cos ^{-1}\left(\frac{9}{5 \sqrt{43}}\right)$$
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