Sandeep,
That is going to be a tough one.
You can use the Command Line Interface to run a "show types mth=<MTH>" where <MTH> is the model type handle. The last column of output will be the attribute Flags. It will tell you if it is an external attribute, readable, writable, stored in memory and/or the database and if it is polled. For example, the following is the output from the following command to dump the attributes for the Rtr_Cisco model type (model type handle 0x21000c) that are polled (with a Flag of "P"):
./show attributes mth=0x21000c | grep -i ",P"
0x10052 sysDescr Text String E,R,D,P
0x100c3 ifNumber Integer E,R,M,D,P
0x10245 sysUpTime Time Ticks E,R,P
0x1102e sysLocation Text String E,R,W,D,P
0x11f7c ifStackLastChange Time Ticks E,R,M,D,P
0x11f7d ifTableLastChange Time Ticks E,R,M,D,P
0x210b66 ccmHistoryRunningLastChanged Integer E,R,M,D,P
0x230c52 snmpEngineBoots Integer E,R,M,D,P
E = External
R = Read
W = Write
M = Value stored in memory
D = Value stored in database
P = Polled
Joe