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JEE Advance - Physics (2007 - Paper 2 Offline - No. 22)

Column I gives some devices and Column II gives some process on which the functioning of these devices depend. Match the devices in Column I with the processes in Column II and indicate your answer by darkening appropriate bubbles in the $$4 \times 4$$ matrix given in the ORS.

Column I Column II
(A) Bimetallic strip (P) Radiation from a hot body
(B) Steam engine (Q) Energy conversion
(C) Incandescent lamp (R) Melting
(D) Electric fuse (S) Thermal expansion

$$[\mathrm{A} \rightarrow(\mathrm{Q, S}); \mathrm{B} \rightarrow(\mathrm{R}); \mathrm{C} \rightarrow(\mathrm{P}); \mathrm{D} \rightarrow(\mathbf{R})]$$
$$[\mathrm{A} \rightarrow(\mathrm{R, S}); \mathrm{B} \rightarrow(\mathrm{R}); \mathrm{C} \rightarrow(\mathrm{P}); \mathrm{D} \rightarrow(\mathbf{R, S})]$$
$$[\mathrm{A} \rightarrow(\mathrm{S}); \mathrm{B} \rightarrow(\mathrm{Q}); \mathrm{C} \rightarrow(\mathrm{P}); \mathrm{D} \rightarrow(\mathbf{R})]$$
$$[\mathrm{A} \rightarrow(\mathrm{P, S}); \mathrm{B} \rightarrow(\mathrm{R}); \mathrm{C} \rightarrow(\mathrm{P}); \mathrm{D} \rightarrow(\mathbf{R})]$$

Explanation

(A) A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals having different thermal coefficients.

(B) Steam engine is a device which converts heat energy into mechanical energy and heat is supplied into the engine through the medium of steam. Thus energy conversion is right answer here.

(C) The incandescent light bulb works on incandescence, which is the emission of light radiations caused by heating the filament.

(D) Fuse wire works on the principle of heat and melting, when excess current passes in the circuit, due to heat produced by the excess current fuse melts and prevent the damage.

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