1
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
A simple pendulum is being used to determine th value of gravitational acceleration g at a certain place. Th length of the pendulum is 25.0 cm and a stop watch with 1s resolution measures the time taken for 40 oscillations to be 50 s. The accuracy in g is :
A
4.40%
B
3.40%
C
2.40%
D
5.40%
2
JEE Main 2019 (Online) 12th January Evening Slot
+4
-1
A simple harmonic motion is represented by :

y = 5 (sin 3 $$\pi$$ t + $$\sqrt 3$$ cos 3 $$\pi$$t) cm

The amplitude and time period of the motion are :
A
10 cm, $${3 \over 2}$$ s
B
5 cm, $${2 \over 3}$$ s
C
5 cm, $${3 \over 2}$$ s
D
10 cm, $${2 \over 3}$$ s
3
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A travelling harmonic wave is represented by the equation y(x,t) = 10–3sin (50t + 2x), where, x and y are in mater and t is in seconds. Which of the following is a correct statement about the wave ?
A
The wave is propagating along the positive x-axis with speed 100 ms–1
B
The wave is propagating along the positive x-axis with speed 25 ms–1
C
The wave is propagating along the negative x-axis with speed 25 ms–1
D
The wave is propagating along the negative x-axis with speed 100 ms–1
4
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
Two light identical springs of spring constant k are attached horizontally at the two ends of a uniform horizontal rod AB of length $$\ell$$ and mass m. The rod is pivoted at its centre 'O' and can rotate freely in horizontal plane. The other ends of the two springs are fixed to rigid supports as shown in figure. The rod is gently pushed through a small angle and released. The frequency of resulting oscillation is :

A
$${1 \over {2\pi }}\sqrt {{{3k} \over m}}$$
B
$${1 \over {2\pi }}\sqrt {{{6k} \over m}}$$
C
$${1 \over {2\pi }}\sqrt {{k \over m}}$$
D
$${1 \over {2\pi }}\sqrt {{{2k} \over m}}$$
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Modern Physics
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