I,II,III and IV
I,III, and IV only
I, II and III only
I,II and IV only
Correct answer is A
Transistor is used for amplification of current, power', voltage stabilization and as a switch in logic gates.
When a pure semiconductor is heated, its resistance?
increases
decreases
remains the same
increase and then decreases
Correct answer is B
Heating a pure semiconductor increases the mobility of electrons and holes and hence the conductivity. thus, the resistance decreases on heating
current amplification
power amplification
voltage regulation
energy conversion
Correct answer is C
Zener diode is useful in stabilized power supply i.e to keep steady the voltage of a power supply.
1.42 x 10-19J
3.00 x 10-19J
4.42 x 1010-19J
7.42 x 10-19J
Correct answer is A
Max kinetic energy = Energy of incident electron - work function. EK = hf - w
= 6.6 x 10-34 x 6.7 x 1014 - 3 x 10-19
= 4.422 x 10-19 - 3 x 10-19
= 1.422 x 10-19J
0.31 A
3.20 A
3.40 A
5.00 A
Correct answer is A
Efficiency = (power output)/power input x 100%
= 1s VS x 100% 1p
Vp
∴ (80)/100 = (50)/IP x 200
I P = (50 x 100)/80 x 200 = 0.3125 A