EMF of a cell is dependent on

1. the shape of electrodes
2. the material of electrodes
3. the distance between the electrodes
4. Both (a) and (b)

An object is vibrating at 4000 Hz. The time period of sound produced is

1. 0.0025 s
2. 0.025 s
3. 0.00025 s
4. 0.005 s

(a) If the moment of force is assigned a negative sign, then will the turning tendency of the force be clockwise or anti-clockwise?

(b) Complete the following nuclear reactions given below

I. $^{238}_{92}\text{P} \overset{\alpha} \longrightarrow \text{Q} \overset{\beta} \longrightarrow \text{R} \overset{\beta} \longrightarrow \text{S}$

II. $^{A}${Z}\text{X} \overset{\alpha} \longrightarrow \text{X}{1} \overset{\gamma} \longrightarrow \text{X}{2} \overset{2\beta} \longrightarrow \text{X}{3}

If a man is travelling in a car in a straight line path and the car suddenly turns right, then the man experiences a severe push towards the left. Explain.