1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
If the vectors $$\overrightarrow {AB} = 3\widehat i + 4\widehat k$$ and $$\overrightarrow {AC} = 5\widehat i - 2\widehat j + 4\widehat k$$ are the sides of a triangle $$ABC,$$ then the length of the median through $$A$$ is :
A
$$\sqrt {18} $$
B
$$\sqrt {72} $$
C
$$\sqrt {33} $$
D
$$\sqrt {45} $$
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
If the lines $${{x - 2} \over 1} = {{y - 3} \over 1} = {{z - 4} \over { - k}}$$ and $${{x - 1} \over k} = {{y - 4} \over 2} = {{z - 5} \over 1}$$ are coplanar, then $$k$$ can have :
A
any value
B
exactly one value
C
exactly two values
D
exactly three values
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A beam of unpolarised light of intensity $${{\rm I}_0}$$ is passed through a polaroid $$A$$ and then through another polaroid $$B$$ which is oriented so that its principal plane makes an angle of $${45^ \circ }$$ relative to that of $$A$$. The intensity of the emergent light is
A
$${{\rm I}_0}$$
B
$${{{I_0}} \over 2}$$
C
$${{{I_0}} \over 4}$$
D
$${{{I_0}} \over 8}$$
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
The $${\rm I}$$-$$V$$ characteristic of an $$LED$$ is
A
JEE Main 2013 (Offline) Physics - Semiconductor Question 191 English Option 1
B
JEE Main 2013 (Offline) Physics - Semiconductor Question 191 English Option 2
C
JEE Main 2013 (Offline) Physics - Semiconductor Question 191 English Option 3
D
JEE Main 2013 (Offline) Physics - Semiconductor Question 191 English Option 4
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