Physics Test 24...

A bullet is fired from a gun, the force on the bullet is given by F = 600 − 2 × 10⁵t  where F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet?

Two parallel plate air capacitors of same capacity C are connected in series to a battery of emf E. Then one of the capacitors is completely filled with dielectric material of constant K. The change in the effective capacity of the series combination is

An ionization chamber with parallel conducting plates as anode and cathode, has 5 × 10⁷ electrons and the same number of singly charged positive ions per cm³. The electrons are moving towards the anode with velocity 0.4 m/s. The current density from anode to cathode is 4μA/m². The velocity of positive ions moving towards cathode is

Column - I gives certain physical terms associated with flow of current through a metallic conductor.

Column - II gives some mathematical relations involving electrical quantities. Match Column - I and Column - II with appropriate relations.

The wave motion of electron in a Bohr's orbit of hydrogen is as shown in diagram. The potential energy of electron in the given orbit of hydrogen atom is:

A proton accelerated from rest through a potential difference of V volts has a wavelength λ associated with it. An alpha particle in order to have the same wavelength must be accelerated from rest through a potential difference of:

The wavelength of radiation is λ₀ When an electron jumps from third to second orbit of hydrogen atom. For the electron to jump from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

A very long conducting wire is bent in a semicircular shape from A to B as shown in figure. The magnetic field at point P for steady current configuration is given by:

If the density of air is ρ_a and that of the liquid ρ_l, then for a given piston speed the rate (volume per unit time) at which the liquid is sprayed will be proportional to

If W₁,W₂ and W₃ represent the work done in moving a particle from A to B along three different paths, 1,2 and 3, respectively, (as shown in the figure) in the gravitational field of a point mass m, find the correct relation between W₁, W₂ and W₃.