1
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1

A ball is spun with angular acceleration $$\alpha$$ = 6t2 $$-$$ 2t where t is in second and $$\alpha$$ is in rads$$-$$2. At t = 0, the ball has angular velocity of 10 rads$$-$$1 and angular position of 4 rad. The most appropriate expression for the angular position of the ball is :

A
$${3 \over 2}{t^4} - {t^2} + 10t$$
B
$${{{t^4}} \over 2} - {{{t^3}} \over 3} + 10t + 4$$
C
$${{2{t^4}} \over 3} - {{{t^3}} \over 6} + 10t + 12$$
D
$$2{t^4} - {{{t^3}} \over 2} + 5t + 4$$
2
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1

A $$\sqrt {34}$$ m long ladder weighing 10 kg leans on a frictionless wall. Its feet rest on the floor 3 m away from the wall as shown in the figure. If Ef and Fw are the reaction forces of the floor and the wall, then ratio of $${F_w}/{F_f}$$ will be :

(Use g = 10 m/s2.)

A
$${6 \over {\sqrt {110} }}$$
B
$${3 \over {\sqrt {113} }}$$
C
$${3 \over {\sqrt {109} }}$$
D
$${2 \over {\sqrt {109} }}$$
3
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1

Match List-I with List-II

List-I List-II
(A) Moment of inertia of solid sphere of radius R about any tangent. (I) $${5 \over 3}M{R^2}$$
(B) Moment of inertia of hollow sphere of radius (R) about any tangent. (II) $${7 \over 5}M{R^2}$$
(C) Moment of inertia of circular ring of radius (R) about its diameter. (III) $${1 \over 4}M{R^2}$$
(D) Moment of inertia of circular disc of radius (R) about any diameter. (IV) $${1 \over 2}M{R^2}$$

Choose the correct answer from the options given below :

A
A - II, B - I, C - IV, D - III
B
A - I, B - II, C - IV, D - III
C
A - II, B - I, C - III, D - IV
D
A - I, B - II, C - III, D - IV
4
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1

When a ball is dropped into a lake from a height 4.9 m above the water level, it hits the water with a velocity v and then sinks to the bottom with the constant velocity v. It reaches the bottom of the lake 4.0 s after it is dropped. The approximate depth of the lake is :

A
19.6 m
B
29.4 m
C
39.2 m
D
73.5 m
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Mechanics
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Modern Physics
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