JEE Main 2020 (Online) 3rd September Evening Slot | Simple Harmonic Motion Question 62 | Physics

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

A block of mass m attached to a massless spring is performing oscillatory motion of amplitude ‘A’ on a frictionless horizontal plane. If half of the mass of the block breaks off when it is passing through its equilibrium point, the amplitude of oscillation for the remaining system become fA. The value of f is :

$${1 \over 2}$$

$$\sqrt 2 $$

$${1 \over {\sqrt 2 }}$$

JEE Main 2020 (Online) 2nd September Evening Slot

MCQ (Single Correct Answer)

-1

The displacement time graph of a particle executing S.H.M is given in figure :
(sketch is schematic and not to scale) JEE Main 2020 (Online) 2nd September Evening Slot Physics - Simple Harmonic Motion Question 63 English

JEE Main 2020 (Online) 2nd September Evening Slot Physics - Simple Harmonic Motion Question 63 English

Which of the following statements is/are true for this motion?
(A) The force is zero at t = $${{3T} \over 4}$$
(B) The acceleration is maximum at t = T
(C) The speed is maximum at t = $${{T} \over 4}$$
(D) The P.E. is equal to K.E. of the oscillation at t = $${{T} \over 2}$$

(B), (C) and (D)

(A), (B) and (C)

(A) and (D)

(A), (B) and (D)

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

-1

Two identical strings X and Z made of same material have tension T_X and T_Z in them. If their fundamental frequencies are 450 Hz and 300 Hz, respectively, then the ratio T_X/T_Z is

2.25

0.44

1.25

1.5

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

A wire of length L and mass per unit length 6.0 × 10^–3 kgm^–1 is put under tension of 540 N. Two consecutive frequencies that it resonates at are : 420 Hz and 490 Hz. Then L in meters is :

5.1 m

2.1 m

1.1 m

8.1 m

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