1
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be :

A
7.5 rad
B
15 rad
C
20 rad
D
30 rad
2
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A 100 g of iron nail is hit by a 1.5 kg hammer striking at a velocity of 60 ms$$-$$1. What will be the rise in the temperature of the nail if one fourth of energy of the hammer goes into heating the nail?

[Specific heat capacity of iron = 0.42 Jg$$-$$1 $$^\circ$$C$$-$$1]

A
675$$^\circ$$C
B
1600$$^\circ$$C
C
16.07$$^\circ$$C
D
6.75$$^\circ$$C
3
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If the charge on a capacitor is increased by 2 C, the energy stored in it increases by 44%. The original charge on the capacitor is (in C)

A
10
B
20
C
30
D
40
4
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A long cylindrical volume contains a uniformly distributed charge of density $$\rho$$. The radius of cylindrical volume is R. A charge particle (q) revolves around the cylinder in a circular path. The kinetic energy of the particle is :

A
$${{\rho q{R^2}} \over {4{\varepsilon _0}}}$$
B
$${{\rho q{R^2}} \over {2{\varepsilon _0}}}$$
C
$${{q\rho } \over {4{\varepsilon _0}{R^2}}}$$
D
$${{4{\varepsilon _0}{R^2}} \over {q\rho }}$$
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