Physics Test - ...

A pipe open at both ends and a pipe closed at one end have the same length. The ratio of frequencies of their P^thovertone is

Maximum kinetic energy gained by the charged particle in the cyclotron is independent of

The magnifying power of a telescope is nine. When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal length of the objective and eyepiece are respectively

In a hydrogen atom, an electron of charge e revolves in a orbit of radius r with speed v. Then, magnetic moment associated with electrons is

The stopping potential of the photoelectrons from a photocell is

Consider a particle of mass m suspended by a string at the equator. Let R and M denote the radius and mass of the earth. If ω is the angular velocity of rotation of the earth about its own axis, then the tension on the string will be (cos 0º = 1)

The fundamental frequency of the sonometer wire Increases by 9 Hz, if its tension is increased by 69%, keeping the length constant. The frequency of the wire is

A potentiometer wire has length L For a given cell of emf E, the balancing length is L/3 from the positive end of the wire. If the length of potentiometer wire is increased by 50% , then for the same cell, the balance point is obtained at length

A mass is whirled in a circular path with constant angular velocity and its linear velocity is v. If the string is now halved keeping the angular momentum the same, the linear velocity is

In Young’s double slit experiment, a fifth dark fringe is formed opposite to one of the slit. If D is the distance between the slits and the screen and d is the separation between toe slits, then toe wavelength of fight used is

A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input power is 0.8, then the current drawn by primary winding is

If the speed of an electron of hydrogen atom in the ground state is 2.2 x 10⁶ m/s, then its speed in the third excited state will be

The vectors (A + B) and (A - B) are at right angles to each other. This Is possible under the condition

A person measures a time period of a simple pendulum inside a stationary lift and finds it to be T. If the lit starts accelerating upwards with an acceleration (g/3) the time period of the pendulum will be

In damped SHM, the Sl unit of damping constant is

When a certain metal surface is illuminated with a light of wavelength λ, the stopping potential is V, When the same surface is illuminated by light of wavelength 2λ, the stopping potential is (V/3). The threshold wavelength for the surface is

A hole is drilled half way to the centre of the earth. A body weighs 300 N on the surface of the earth. How much wil, it weigh at the bottom of the hole?