1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An object of mass m is suspended at the end of a massless wire of length L and area of crosssection A. Young modulus of the material of the wire is Y. If the mass is pulled down slightly its frequency of oscillation along the vertical direction is :
A
$$f = {1 \over {2\pi }}\sqrt {{{YA} \over {mL}}} $$
B
$$f = {1 \over {2\pi }}\sqrt {{{mL} \over {YA}}} $$
C
$$f = {1 \over {2\pi }}\sqrt {{{YL} \over {mA}}} $$
D
$$f = {1 \over {2\pi }}\sqrt {{{mA} \over {YL}}} $$
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Molecules of an ideal gas are known to have three translational degrees of freedom and two rotational degrees of freedom.The gas is maintained at a temperature of T. The total internal energy, U of a mole of this gas, and the value of
$$\gamma \left( { = {{{C_p}} \over {{C_v}}}} \right)$$ are given, respectively by:
A
U = $${5 \over 2}RT$$ and $$\gamma = {7 \over 5}$$
B
U = 5RT and $$\gamma = {6 \over 5}$$
C
U = 5RT and $$\gamma = {7 \over 5}$$
D
U = $${5 \over 2}RT$$ and $$\gamma = {6 \over 5}$$
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
An AC circuit has R= 100 $$\Omega $$, C = 2 $$\mu $$F and L = 80 mH, connected in series. The quality factor of the circuit is :
A
20
B
2
C
0.5
D
400
4
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Change Language
Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial speed. The angle between the initial velocities of the two bodies (in degree) is ________.
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