(a) (i) How can a temperature in degree Celsius be converted into SI u

1.	(a) (i) How can a temperature in degree Celsius be converted into SI unit of temperature? (ii) A liquid X has the maximum specific heat capacity and is used as a coolant in Car radiators. Name the liquid X. (b) A solid metal weighing 150 g melts at its melting point of 800°C by providing heat at the rate of 100 W The time taken for it to completely melt at the same temperature is 4 mm. What is the specific latent heat of fusion of the metal? (c) Identify the following wires used in a household circuit: (i) The wire is also called as the phase wire. (ii) The wire is connected to the top terminal of a three-pin socket. (d) (i) What are isobars? (ii) Give one example of isobars. (e) State any two advantages of electromagnets over permanent magnets.
Answer» (a) (i) 1°C = 273 K (ii) Water (b) Using Q=mL, 100 x 4 x 60 x =150 x 10^-3 x L or L =100460/15010^-3 = L = 1.6 x 10⁵J Kg-1 (c)* (i) Live wire (ii) Earth wire (d) (i) Elements having same mass number but different atomic number. (ii) ¹⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca. (e) (i) Strength can be increased or decreased during working (ii) Polarities can be changed during working.

(a) (i) How can a temperature in degree Celsius be converted into SI unit of temperature? (ii) A liquid X has the maximum specific heat capacity and is used as a coolant in Car radiators. Name the liquid X. (b) A solid metal weighing 150 g melts at its melting point of 800°C by providing heat at the rate of 100 W The time taken for it to completely melt at the same temperature is 4 mm. What is the specific latent heat of fusion of the metal? (c) Identify the following wires used in a household circuit: (i) The wire is also called as the phase wire. (ii) The wire is connected to the top terminal of a three-pin socket. (d) (i) What are isobars? (ii) Give one example of isobars. (e) State any two advantages of electromagnets over permanent magnets.

Answer»

(a) (i) 1°C = 273 K

(ii) Water

(b) Using Q=mL, 100 x 4 x 60 x =150 x 10^-3 x L or L =100*4*60/150*10^-3 = L = 1.6 x 10⁵J Kg-1

(c) (i) Live wire

(ii) Earth wire

(d) (i) Elements having same mass number but different atomic number.

(ii) ¹⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca.

(e) (i) Strength can be increased or decreased during working (ii) Polarities can be changed during working.