Which of the following gives a reversible operation?
Two liquids of densities ρ1 and ρ2 (ρ2 = 2ρ1) are filled up behind a square wall of side 10 m as shown in figure. Each liquid has a height of 5 m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing)
23
Sep
Two liquids of densities ρ1 and ρ2 (ρ2 = 2ρ1) are filled up behind a square wall of side 10 m as shown in figure. Each liquid has a height of 5 m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is [...]
A galvanometer having a coil resistance of 100Ω gives a full scale deflection when a current of 1mA is passed through it. What is the value of the resistance which can convert this galvanometer into voltmeter giving a full scale deflection for a potential difference of 10 V ?
23
Sep
A galvanometer having a coil resistance of 100Ω gives a full scale deflection when a current of 1mA is passed through it. What is the value of the resistance which can convert this galvanometer into voltmeter giving a full scale deflection for a potential difference of 10 V ? Which of the following gives a [...]
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is (1/8)th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is
23
Sep
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is (1/8)th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is In a double slit experiment Which of the following gives [...]
A particle moves such that its position vector r(t) = cos ωt i + sin ωt j where ω is a constant and t is time. Then which of the following statements is true for the velocity vector v(t) and acceleration vector a(t) of the particle
23
Sep
A particle moves such that its position vector r(t) = cos ωt i + sin ωt j where ω is a constant and t is time. Then which of the following statements is true for the velocity vector v(t) and acceleration vector a(t) of the particle Which of the following gives a reversible operation? September [...]
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by : (Graphs are drawn schematically and are not to scale)
23
Sep
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by : (Graphs are drawn schematically and are not to scale) Which of [...]
A particle of mass m is dropped from a height h above the ground. At the same time another particle of the same mass is thrown vertically upwards from the ground with a speed of √2gh. If they collide head-on completely inelastically, the time taken for the combined mass to reach the ground, in units of √(h/g) is :
23
Sep
A particle of mass m is dropped from a height h above the ground. At the same time another particle of the same mass is thrown vertically upwards from the ground with a speed of √2gh. If they collide head-on completely inelastically, the time taken for the combined mass to reach the ground, in units [...]
A simple pendulum is being used to determine the value of gravitational acceleration g at a certain place. The 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 :
23
Sep
A simple pendulum is being used to determine the value of gravitational acceleration g at a certain place. The 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 : Which of the following gives [...]
A particle is moving along the x-axis with its coordinate with time t given by x(t) = 10 + 8t – 3t^2. Another particle is moving along the y-axis with its coordinate as a function of time given by y = 5 – 8t^3 m. At t = 1 s, the speed of the second particle as measured in the frame of the first particle is given as √v . Then v (m/s) is
23
Sep
A particle is moving along the x-axis with its coordinate with time t given by x(t) = 10 + 8t – 3t^2. Another particle is moving along the y-axis with its coordinate as a function of time given by y = 5 – 8t^3 m. At t = 1 s, the speed of the second [...]
Consider a uniform rod of mass M = 4m and length l pivoted about its centre. A mass m moving with velocity v making angle θ = π/4 to the rod’s long axis collides with one end of the rod and sticks to it. The angular speed of the rod-mass system just after the collision is
23
Sep
Consider a uniform rod of mass M = 4m and length l pivoted about its centre. A mass m moving with velocity v making angle θ = π/4 to the rod’s long axis collides with one end of the rod and sticks to it. The angular speed of the rod-mass system just after the collision [...]
Photon with kinetic energy of 1MeV moves from south to north. It gets an acceleration of 10^12 m/s^2 by an applied magnetic field (west to east). The value of magnetic field : (Rest mass of proton is 1.6 × 10^–27 kg) :
23
Sep
Photon with kinetic energy of 1MeV moves from south to north. It gets an acceleration of 10^12 m/s^2 by an applied magnetic field (west to east). The value of magnetic field : (Rest mass of proton is 1.6 × 10^–27 kg) : Which of the following gives a reversible operation? September 23, 2021 Category: JEE [...]