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1
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
The time period of a simple pendulum is given by $$T = 2\pi \sqrt {{l \over g}}$$. The measured value of the length of pendulum is 10 cm known to a 1mm accuracy. The time for 200 oscillations of the pendulum is found to be 100 second using a clock of 1s resolution. The percentage accuracy in the determination of 'g' using this pendulum is 'x'. The value of 'x' to be nearest integer is :-
A
2%
B
3%
C
5%
D
4%
2
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
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
$$\sqrt {{{{K_2}} \over {{K_1}}}}$$
3
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
A block of mass 1 kg attached to a spring is made to oscillate with an initial amplitude of 12 cm. After 2 minutes the amplitude decreases to 6 cm. Determine the value of the damping constant for this motion . (take ln 2 = 0.693)
A
0.69 $$\times$$ 102 kg s$$-$$1
B
3.3 $$\times$$ 102 kg s$$-$$1
C
1.16 $$\times$$ 10$$-$$2 kg s$$-$$1
D
5.7 $$\times$$ 10$$-$$3 kg s$$-$$1
4
JEE Main 2021 (Online) 16th March Evening Shift