JEE Main 2023 · 15 Apr 2023 Shift 1

In a linear Simple Harmonic Motion (SHM)

1. ARestoring force is directly proportional to the displacement.
2. BThe acceleration and displacement are opposite in direction.
3. CThe velocity is maximum at mean position.
4. DThe acceleration is minimum at extreme points. Choose the correct answer from the options given below:

A flask contains Hydrogen and Argon in the ratio 2:1 by mass. The temperature of the mixture is 30°C. The ratio of average kinetic energy per molecule of the two gases (K argon/K hydrogen) is : (Given: Atomic Weight of Ar = 39.9)

1. A39.9/2
2. B1
3. C39.9
4. D2

A wire of length ‘L’ and radius ‘r’ is clamped rigidly at one end. When the other end of the wire is pulled by a force f, its length increases by ‘l’. Another wire of same material of length ‘2L’ and radius ‘2r’ is pulled by a force ‘2f’. Then the increase in its length will be :

1. Al
2. B2l
3. C4l
4. Dl/2

A body is released from a height equal to the radius (R) of the earth. The velocity of the body when it strikes the surface of the earth will be : (Given g = acceleration due to gravity on the earth.)

1. A√(2gR)
2. B√(4gR)
3. C√(gR/2)
4. D√(gR)

Two identical particles each of mass ‘m’ go round a circle of radius a under the action of their mutual gravitational attraction. The angular speed of each particle will be :

1. A√(Gm/(2a³))
2. B√(Gm/(4a³))
3. C√(Gm/(8a³))
4. D√(Gm/a³)

A vector in x − y plane makes an angle of 30° with y-axis. The magnitude of y-component of vector is 2√3. The magnitude of x-component of the vector will be :

1. A2
2. B√3
3. C1/√3
4. D6

The position of a particle related to time is given by x = (5t² − 4t + 5) m. The magnitude of velocity of the particle at t = 2s will be :

1. A14 ms⁻¹
2. B16 ms⁻¹
3. C10 ms⁻¹
4. D06 ms⁻¹

The speed of a wave produced in water is given by v = λᵃ gᵇ ρᶜ. Where λ, g and ρ are wavelength of wave, acceleration due to gravity and density of water respectively. The values of a, b and c respectively, are :

1. A1, 1, 0
2. B1/2, 0, 1/2
3. C1/2, 1/2, 0
4. D1, −1, 0