confusion in EDS mcqs
 

please seniors kindly help me out by solving the following mcqs.. i have doubt on their answers because diffrent books have different answers.
1)fo0d is stored in liver or stomach?
2)mirage is reflection of light or refrection of light?
3)water is bad conductor of electricity?true or false
4)gas in children balloon is hydrogen or hellium ?
5)bacteria are parasite?
6)the set of instruction given to computer is command or programme?
7)which two gasses we exhale more than we inhale ?
8)chemical energy used in refrigerator is ...............?
9)most abundant element is human body?

Proposed Answers, I am sorry if I am wrong

1) Food is mixed and partially digested in stomach so its stomach

2) Mirage is due to the refraction of light

3) Water in its pure form is not a good conductor of electricity

4) Helium gas is used in party balloons

5) Bacteria are parastic organisms

6) Set of instuctions obeyed by the computer is a computer program

7) Carbon dioxide and Nitric oxide are exhaled by humans

8) Condensation:thinking

9) Oxygen

@ samren

xeesabir answered all your queries correctly except one.

CHEMICAL ENERGY USED IN REFRIGERATORS IS FREON (one of the chlorofluorocarbon groups)

[QUOTE=xeesabir;335194]Proposed Answers, I am sorry if I am wrong

1) Food is mixed and partially digested in stomach so its stomach
but food in the form of carbohydrate are stored in liver? m confused what is the actual answer of this question:(

4) Helium gas is used in party balloons
in some websites it also written that hydrogen is also used ..and hydrogen is also lighter than helium.

5) Bacteria are parastic organisms.
cant bacteria live without host ?

6) Set of instuctions obeyed by the computer is a computer program
in some books it written command??:( i also think its programme ...but ...

[QUOTE=samreenhassan;335316]
1) Food is mixed and partially digested in stomach so its stomach
but food in the form of carbohydrate are stored in liver? m confused what is the actual answer of this question:( [/QUOTE]

It's stomach. Liver stores glucose, which gets converted to glycogen on reaction with insulin. Glucose-glycogen conversion etc are undertaken to maintain a proper sugar level in body. Don't confuse food storage with it.

[QUOTE]
4) Helium gas is used in party balloons
in some websites it also written that hydrogen is also used ..and hydrogen is also lighter than helium.
[/QUOTE]

The reason is, I think, Hydrogen is a reactive gas, you won't find it in free form. Helium on the other hand is an inert gas and can thus exist freely.

[QUOTE]
5) Bacteria are parastic organisms.
cant bacteria live without host ?
[/QUOTE]

I think yes.

[QUOTE]
6) Set of instuctions obeyed by the computer is a computer program
in some books it written command??:( i also think its programme ...but ...[/QUOTE]
Program is the answer. I think, one instruction is called a command, when we have a set of instruction/ set of commands it becomes a program.

Hydrogen is flammable. Helium is not. Hindenburg remember?

You are right, but I think, neither am I wrong.

Yeah, well, it is a heck of a lot more reactive than helium. True that.

There is actually no chemical energy change involved in refrigeration. Freon is a working fluid; it just changes phase in refrigeration. If there isn't any mistake in the MCQ, then my guess is the answer is none. The whole refrigeration cycle involves physical changes; at no step is breaking of bonds or formation of bonds involved (The subsequent energy changes being called chemical energy).

Exactly! Freon gas is first compressed by a compressor, whereby it changes its state to a liquid, that liquid is passed through the coils. The heat inside the refrigerator evaporates that liquid (to gas freon yet again). It is this evaporation that causes cooling inside a refrigerator. Now this is a physical change from gas to liquid and vice versa. And change of states involves exchange of energy (energy, either absorbed or released). I searched on the net and came to know that this energy released or absorbed is called [I]Latent heat[/I]. But since it's the process of evaporation that causes cooling inside a refrigerator we are apt to call it "latent heat of vaporization".

So I, for one, would say the chemical energy used in a refrigerator is called "Latent heat of vaporization". Let's see what others say.