1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A body at rest is moved along a horizontal straight line by a machine delivering a constant power. The distance moved by the body in time 't' is proportional to :
A
$${t^{{3 \over 2}}}$$
B
$${t^{{1 \over 2}}}$$
C
$${t^{{1 \over 4}}}$$
D
$${t^{{3 \over 4}}}$$
2
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two vectors $${\overrightarrow P }$$ and $${\overrightarrow Q }$$ have equal magnitudes. If the magnitude of $${\overrightarrow P + \overrightarrow Q }$$ is n times the magnitude of $${\overrightarrow P - \overrightarrow Q }$$, then angle between $${\overrightarrow P }$$ and $${\overrightarrow Q }$$ is :
A
$${\sin ^{ - 1}}\left( {{{n - 1} \over {n + 1}}} \right)$$
B
$${\cos ^{ - 1}}\left( {{{n - 1} \over {n + 1}}} \right)$$
C
$${\sin ^{ - 1}}\left( {{{{n^2} - 1} \over {{n^2} + 1}}} \right)$$
D
$${\cos ^{ - 1}}\left( {{{{n^2} - 1} \over {{n^2} + 1}}} \right)$$
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two small drops of mercury each of radius R coalesce to form a single large drop. The ratio of total surface energy before and after the change is :
A
$${2^{{1 \over 3}}}:1$$
B
$$1:{2^{{1 \over 3}}}$$
C
2 : 1
D
1 : 2
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4$$\pi$$ $$\times$$ 10$$-$$7 H/m. Absolute permeability of the material of the rod is :
A
4$$\pi$$ $$\times$$ 10$$-$$4 H/m
B
2$$\pi$$ $$\times$$ 10$$-$$4 H/m
C
3$$\pi$$ $$\times$$ 10$$-$$4 H/m
D
$$\pi$$ $$\times$$ 10$$-$$4 H/m
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