1
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved?
A
Both, inducting reactance and current will be doubled.
B
Inductive reactance will be doubled and current will be halved.
C
Both, inductive reactance and current will be halved.
D
Inductive reactance will be halved and current will be doubled.
2
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A sphere of mass 2 kg and radius 0.5 m is rolling with an initial speed of 1 ms-1 goes up an inclined plane which makes an angle of 30$$^\circ$$ with the horizontal plane, without slipping. How long will the sphere take to return to the starting point A?

JEE Main 2021 (Online) 17th March Evening Shift Physics - Rotational Motion Question 82 English
A
0.60 s
B
0.52 s
C
0.80 s
D
0.57 s
3
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two particles A and B of equal masses are suspended from two massless springs of spring constants K1 and K2 respectively. If the maximum velocities during oscillations are equal, the ratio of the amplitude of A and B is
A
$${{{K_1}} \over {{K_2}}}$$
B
$$\sqrt {{{{K_1}} \over {{K_2}}}} $$
C
$${{{K_2}} \over {{K_1}}}$$
D
$$\sqrt {{{{K_2}} \over {{K_1}}}} $$
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The velocity of a particle is v = v0 + gt + Ft2. Its position is x = 0 at t = 0; then its displacement after time (t = 1) is :
A
v0 + g + f
B
v0 + $${g \over 2}$$ + $${F \over 3}$$
C
v0 + 2g + 3F
D
v0 + $${g \over 2}$$ + F
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