1
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+2
-0

If the vectors $$\vec{a}=2 \hat{i}+p \hat{j}+4 \hat{k}$$ and $$\vec{b}=6 \hat{i}-9 \hat{j}+q \hat{k}$$ are collinear, then $$p$$ and $$q$$ are

A
$$\mathrm{p=3, q=-12}$$
B
$$\mathrm{p}=3, \mathrm{q}=12$$
C
$$\mathrm{p}=-3, \mathrm{q}=12$$
D
$$\mathrm{p}=-3, \mathrm{q}=-12$$
2
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+2
-0

If $$|\vec{a}|=4,|\vec{b}|=5$$, then the values of $$k$$ for which $$\vec{a}+k \vec{b}$$ is perpendicular to $$\vec{a}-k \vec{b}$$ are

A
$$\pm \frac{5}{4}$$
B
$$\pm \frac{2}{5}$$
C
$$\pm \frac{16}{25}$$
D
$$\pm \frac{4}{5}$$
3
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+2
-0

The vectors $$\overrightarrow{\mathrm{AB}}=3 \hat{\mathrm{i}}+4 \hat{\mathrm{k}}$$ and $$\overrightarrow{\mathrm{AC}}=5 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+4 \hat{\mathrm{k}}$$ are the sides of a triangle $$\mathrm{ABC}$$. The length of the median through $$\mathrm{A}$$ is

A
$$\sqrt{33}$$ units
B
$$\sqrt{288}$$ units
C
$$\sqrt{18}$$ units
D
$$\sqrt{72}$$ units
4
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+2
-0

If $$\bar{a}=2 \hat{i}+3 \hat{j}-\hat{k}, \bar{b}=-\hat{i}+2 \hat{j}-4 \hat{k}$$ and $$\bar{c}=\hat{i}+\hat{j}-2 \hat{k}$$, then $$(\bar{a} \times \bar{b}) \cdot(\bar{a} \times \bar{c})=$$

A
$$-$$30
B
84
C
70
D
984
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