For the circuit would the balancing length increase, decrease or remain the same if
(i) `R_(1)` is decreased
(ii) `R_(2)` is increased, without any change (in each case) in the rest of the circuit ?
Justify your answer in each case.

Will the kinetic energy of molecules increase, decrease or remain same if : (i) the temperature is increased ? (ii) the pressure is decreased ? (iii) the volume is decreased ?

If radius of earth is increased, without chage in its mass, will the length of day increase, decrease or remain same?

In the given circuit if R_1 is increased without disturbing the bias or changing R_2 then

Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.

How is mutual inductance of a pair of coils affected when (i) separation between the coils in increased, (ii) the number of turns of each coil is increased , (iii) a thin iron sheet is placed between the two coils, other factors remaining the same ? Explain your answer in each case.

(i) State Maxwell's right-hand thumb rule. (ii) PQ is a current carrying conductor in the plane of the paper as shown in the figure. Mention the direction of magnetic fields produced by it at points A and B. Given r_(1) lt r_(2) , where will the strength of the magnetic field be larger? Justify your answer in each case.

It is established that an electric current through a conductor produces a magnetic field arount it . Is there a similar magnetic field produced around a thin beam of moving (i) alpha particles, (ii) neutrons ? Justify your answer in each case .

Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.

Two students X and Y perform an experiment on potentiometer separating using the circuit diagram shown here. Keeping other things unchanged (i) X increases the value of resistance R. (ii) Y decreases the value of resistance S in the set up. How would these changes affect the position of the null point in each case and why?

The electronic configuration of an element 'X' is 2,8,8,2. Write its (i) group number, (ii) period number and (iii) the number of valence electrons in its atom. Justify your answer in each case.