1
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

The law which states that a variation in an electric field causes magnetic field, is

A
Faraday's law
B
Bio-Savart law
C
Modified Ampere's law
D
Lenz's law
2
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Radiation of wavelength $$300 \mathrm{~nm}$$ and intensity $$100 \mathrm{~W}-\mathrm{m}^{-2}$$ falls on the surface of a photosensitive material. If $$2 \%$$ of the incident photons produce photoelectron, the number of photoelectrons emitted from an area of $$2 \mathrm{~cm}^2$$ of the surface is nearly

A
$$15 \times 10^{11}$$
B
$$6.04 \times 10^{14}$$
C
$$1.5 \times 10^{12}$$
D
$$60.4 \times 10^{15}$$
3
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Potential energy between a proton and an electron is given by $$U=\frac{K e^2}{3 R^3}$$, then radius of Bohr's orbit can be given by

A
$$\frac{K e^2 m}{h^2}$$
B
$$\frac{6 \pi^3 K e^2 m}{n^3 h^2}$$
C
$$\frac{2 \pi}{n} \frac{K e^2 m}{h^2}$$
D
$$\frac{4 \pi^2 K e^2 m}{n^3 h^2}$$
4
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

A transistor is connected in common emitter configuration. The collector supply is $$8 \mathrm{~V}$$ and the voltage drop across a resistor of $$800 \Omega$$ in the collector circuit is $$0.5 \mathrm{~V}$$. If the current gain factor $$\alpha$$ is 0.96, then the base current is

A
$$2.6 \times 10^{-5} \mathrm{~A}$$
B
$$3.6 \times 10^{-5} \mathrm{~A}$$
C
$$5.6 \times 10^{-5} \mathrm{~A}$$
D
$$6.6 \times 10^{-5} \mathrm{~A}$$
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