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Identify the semiconductor devices whose characteristics are given below, in the order (a), (b), (c), (d) :

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On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam :

Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume $u=VU ∝T_{4}$ and pressure $p=31 (VU )$. If the shell now undergoes an adiabatic expansion the relation between T and R is :

If all the words (with or without meaning) having five letters, formed using the letters of the word SMALL and arranged as in a dictionary; then the position of the word SMALL is :

The supply voltage to a room is 120 V. The resistance of the lead wires is 6 $Ω$ A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

If A is an $3×3$non-singular matrix such that A$A_{_{′}}$=$A_{_{′}}A$and $B=A_{−1}A_{_{′}}$, then $BB_{_{′}}$equals

In the circuit shown, the current in the $1Ω$ resistor is :

The intercepts on x-axis made by tangents to the curve, $y=∫_{0}∣t∣dt,x∈R,$which are parallel to the line $y=2x$, are equal to

If x, y, z are in A.P. and $tan_{−1}x,tan_{−1}yandtan_{−1}z$are also in A.P., then