Physics Test - ...

The surface tension of the soap solution is 0.03 N/m. The work done in blowing to form a soap bubble of surface area 40 cm², (in J), is

Young's double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are β_G, β_R and β_B, respectively. Then,

The circuit shown here is used to compare the emf'semf′s of two cells E1 and E2(E1>E2). The null point is at C when the galvanometer is connected to E₁. When the galvanometer is connected to E₂, the null point will be -

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:

Solid metallic cuboid of homogeneous material having geometrical dimension as shown in figure will have ratio of resistances for the sense of current along X, Y and Z directions respectively-

A particle at the end of a spring executes simple harmonic motion with a period t₁, while the corresponding period for another spring is t₂. If the period of oscillation with the two springs in series is T, then

A merry-go-round is at rest, pivoted about a frictionless axis. A child of mass m runs along the path tangential to the rim with speed v and jumps on to merry-go-round. If R be the radius of merry-go-round and I is the moment of inertia, then the angular velocity of the merry-go-round and the child is

A bar magnet has a magnetic moment of 10 A m². If its magnetic length is 5 cm,  Its pole strength is

The time period of a satellite of earth is 5 hour. If the seperation between the earth and the satellite is increased to 4 times the previous value, the new time period will become

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal versus the frequency of the incident radiation gives a straight line whose slope