1
TS EAMCET 2020 (Online) 10th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The wavelength of a spectral line emitted by hydrogen atom in the Balmer series is $\frac{16}{3 R}$

( $R$ is Rydberg constant). What is the value of the principal quantum number of the state from which the transition takes place?

A

2

B

3

C

4

D

5

2
TS EAMCET 2020 (Online) 10th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The half-life of a radioactive sample is 5 s . If the initial mass of the sample is 60 g , then the time required to reduce the sample to 7.5 g is

A

15 s

B

75 s

C

7.5 s

D

10 s

3
TS EAMCET 2020 (Online) 10th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A Zener diode is connected to battery and a load resistance as shown below

TS EAMCET 2020 (Online) 10th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 9 English

The currents $I, I_Z$ and $I_L$ respectively are

A

$10 \mathrm{~mA}, 5 \mathrm{~mA}, 5 \mathrm{~mA}$

B

$15 \mathrm{~mA}, 7.5 \mathrm{~mA}, 7.5 \mathrm{~mA}$

C

$12.5 \mathrm{~mA}, 5 \mathrm{~mA}, 7.5 \mathrm{~mA}$

D

$12.5 \mathrm{~mA}, 7.5 \mathrm{~mA}, 5 \mathrm{~mA}$

4
TS EAMCET 2020 (Online) 10th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A semiconductor is doped with phosphorous atoms as impurity. The impurity levels created in the semiconductor are close to the

A

top of the valence band

B

bottom of the conduction band

C

bottom of the valence band

D

top of the conduction band

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