ICSE − Q & A

Please answer the following :
1200g of molten lead at its melting point 325 degrees Celsius, is dropped into 600g of water at 10 degrees Celsius. Calculate the final temperature of the mixture. (Specific heat capacity of lead=0.15,water=4.2,and specific latent heat of fusion of lead=30 joule per gram)

why is soft iron used to make the armature of electric bell?

CONCISE TB EX(1B) 14 th question how do u answer this?

WHATS A DOUBLE POLE SWITCH?

1)What is the refractive index of an opaque body?Give reason.
2)On what factors does velocity of wave in a medium depend?
3)State the unit of magnetic field in terms of force experienced by a current carrying conductor placed in a magnetic field.
4)When can an electric charge give rise to a magnetic field?
5)Heat supplied to a substance during its change of state does not cause any rise in temp.Explain.

Is derivations mentioned on page 187 and 188 in concise book imp???

Concise phy excercise 9A Q 15

What is possibility of energy being asked in section A?

Will physics specimen paper help us in r exam??? Just asking.

Gain in torque happens when gear ratio is <1 or >1? 
its given <1 in Selina