1
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The half-life of a radiocative isotope is 30 h . How long will it take to get reduced to $12.5 \%$ of its initial amount?

A

120 h

B

90 h

C

60 h

D

50 h

2
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following circuits satisfies the logic condition $A=1, B=1$ and $D=1$ ?

A

TS EAMCET 2020 (Online) 14th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English Option 1

B

TS EAMCET 2020 (Online) 14th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English Option 2

C

TS EAMCET 2020 (Online) 14th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English Option 3

D

TS EAMCET 2020 (Online) 14th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English Option 4

3
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In an $n-p-n$ transistor, $95 \%$ of emitted electrons reach the collector. If the base current is 2 mA , then collector current is

A

19 mA

B

38 mA

C

9.5 mA

D

48 mA

4
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A message signal of frequency $50 / \pi \mathrm{kHz}$ and peak voltage of 5 V is used to modulate a carrier of frequency 1 MHz and peak voltage 20 V . The modulation index is

A

$\frac{\pi}{10}$

B

0.4

C

0.5

D

0.25

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