The object to the right of you...

My water bottle. I just slammed it against the palm of my hand and I'm sure it could break through the skull if hit repeatedly. I'd give it a 6/10 because it would be energy consuming doing that, but on the plus side it holds water so I won't be thirsty in the apocalypse.

My phone. Good for about two days before I have to start using it as a blunt melee weapon. Cool.

My laptop charger.

I'd say 7/10

It could be used for strangling, tripping, or just whipping around.

A window....so I'll go with a 7/10; I could make a good shank from it.

A wall.

Virtually useless.

- 10/10

A metal bookmark. If I stab a zombie through the eye and just keep jabbing it through the eye socket, just maybe I can get to the brain, but I doubt that.
Could potentially hurt another human with ill intentions though, if I need to get away in a struggle with said human being.
So, 5/10.

A pen. Stabby stabby in the eye and brain. But it's pretty crappy plastic that breaks easy when you step on it or hit it hard. Not very useful. Hah.
4/10.

My maths homework. Let's just bore them all to the afterlife.

my TV remote. I could possibly whack them with it, throw it at their heads, etc. Maybe a 5/10 if I'm lucky.

An oversized shirt. I can...suffocate them with it? 4/10 probably, considering I don't think zombies need to breathe anyway.

My pillow! Unless these zombies can't handle a soft lumpy pillow, my chances are 3/10.

A rolly chair. Hell yeah. Roll away into the glorious sunset, then bash heads in with the chair's legs.

My hairdryer. That thing is invincible, 10/10 chance of survival.

Pillow. 0/10 unless by 'zombies' you mean someone in desperate need of a nap, and then my odds of survival go up to 10/10.

My iPad. 0/10, it'll just shatter if I try to hit anyone with the bloody thing.

Set of kitchen knives + pair of scissors (it's all in one holder so I'm counting it as one), so it's 10/10 if the zombies are slow. Approximately a 7/10 if they're fast.

The game of life.... 5/10. There's choking hazards. And a board to hit with. And 'money' for those previously rich(maybe I could bribe them).

My Guitar Hero guitar controller. I could bash some heads in if I try hard enough, maybe choke them with the strap (though zombies don't need to breathe, soooo). Mm, 7/10? It's gonna get tiring swinging this hunk of plastic 'round and 'round.

Uhm a weightbench. So. If I was like. The hulk. Superceffective.

My Crybaby pedal. It's a massive slab of metal and can withstand me standing on it when I want to make stupid noises with my guitar, so I'm going to assume it's pretty hardy. I'm going to say 9/10 because it's heavy as hell and does serious damage when it hits bones (not that I've ever hit anyone with it )