Can this be called rectification

No..

N0, it's just a capacitor charging to the positive peak voltage and discharging, then it charges with the negative peak voltage, when you throw the switch the other way, you don't know how much charge is in the cap it could be zero depend on timing with the AC.

I have been able to throw the switch at the crossing point and the lamp didn't light. P.S. The charge in the cap is dc voltage. Think about it.

This capacitor will normally blow up.

Not so, if it is rated for AC, and even a dc cap won't blow up as long as you don't exceed the working voltage of the cap. Capacitors are used in ac applications in lots of equipment ie: power factor correction, single phase motor starting , ac filtering before rectification for a power supply Etc.

Thanks I realized that now ☺

Since you seem interested in electronics/electricity, I would like to ask a couple questions to see if you understand,if you don't mind, and using your original circuit build on it to answer the questions. 1. you know that a rectifier only lets half of the sine wave pass thru it, right? 2. which way can you connect a rectifier to get either the positive half cycle or the negative half.

Well if we reverse the direction of the rectifier,we reverse the cycle right?

Kind of, what you actually do is let half of the cycle pass thru, see the rectifier stops conducting once the wave reaches the zero crossing point, and then wait for the wave to come back around to start conducting again.

Yes,I'm just an enthusiastic high school student,not sure if I want to take up electronics

I am sure that you will do fine whatever you decide to major in. ...I think that an EECS degree is the way to go, just look around and what do you see, self driving cars (a robot)....actual robots doing industrial work, and soon robots in every home to assist with household chores. the future is almost here, so what I am saying is that if you went into electronics/electrical field you will do better than an anthropologist for example. It does take a lot of hard work and some people don't want to do the "difficult" subjects, instead they take the easy route, and then complain because they got a lousy job.

I am thinkING of doing medicine or engineering in electronics and have to make a decision in a month or so

The "engineering " in all; is what you should do. Design thermal activated/powered nano-pills to help reduce the amount of EyeBleach needed after managing to accidentally falling in the deep end of Reddit or similar sites that I shall leave sauceless for the sake of the EC community.