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Superposition: Systems that satisfy both homogeneity and additivity are considered to be linear systems. These two rules, taken together, are often referred to as the principle of superposition.
Homogeneity: As we increase the strength of a simple input to a linear system, say we double it, then we predict that the output function will also be doubled.
If the system is linear, then the measured response will be just the sum of its responses to each of the two stimuli presented separately.

Contents like Cd,PVC etc causes lungs damage.
Elements like Pb causes brain damage in children-
Cr causes dna damage-studies are going on this.
So all of the choices are correct.

LEDs are made out of compound semiconductor materials of group 3 and 5. Ga and Si aren’t suitable to construct LEDs, because those junction produce heat and no appreciable IR or visible light.

A handover is a process in telecommunications in which a connected cellular call or a data session is transferred from base station to another without disconnecting the session.
Soft handover or soft handoff refers to a feature used by the CDMA and W-CDMA standards, where a cell phone is simultaneously connected to two or more cells during a call.

DPTR used to point external memory

Total duration of power consumption= 5*30=150hrs

Total power=100?=200W

Energy consumed= Power*Time

E=200*150=30000Wh=30kwh

rms value=0.7*peak value
irms=0.7*141=99.7~100A

1 kwh=859.846~860kcal

R=?*l/A
where,
R: resistance
?: resistivity
l: length of wire
A: area of wire
R1=50,
l2=2*l
V1=A1*l1,
V2=A2*l2, V1=V2
from this, A2=A1/2
R2=?*2l1/(A1/2)
R2=4*R1
4*50=200

Ripple frequency of bridge rectifier is twice the supply frequency.

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