1
TG EAPCET 2025 (Online) 2nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two radioactive substances $A$ and $B$ have same number of initial nuclei. If the half lives of $A$ and $B$ are 1.5 days and 4.5 days respectively, then the ratio of the number of nuclei remaining in $A$ and $B$ after 9 days is

A

$1: 16$

B

$1: 1$

C

$1: 4$

D

$1: 8$

2
TG EAPCET 2025 (Online) 2nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

$10^{10}$ electrons enter the emitter of a junction transistor in a time of $0.4 \mu \mathrm{~s}$. If $5 \%$ of the electrons are lost in the base, then the collector current is

A

3.0 mA

B

3.2 mA

C

3.6 mA

D

3.8 mA

3
TG EAPCET 2025 (Online) 2nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

An electron in $n$-region of a $p-n$ junction moves towards the junction with a speed of $5 \times 10^5 \mathrm{~ms}^{-1}$. If the barrier potential of the junction is 0.45 V , then the speed with which the electron enters the $p$-region after penetration through the barrier is

(Charge of the electron $=1.6 \times 10^{-19} \mathrm{C}$ and mass of the electron $=9 \times 10^{-31} \mathrm{~kg}$ )

A

$3 \times 10^5 \mathrm{~ms}^{-1}$

B

$5 \times 10^5 \mathrm{~ms}^{-1}$

C

$4 \times 10^5 \mathrm{~ms}^{-1}$

D

$6 \times 10^5 \mathrm{~ms}^{-1}$

4
TG EAPCET 2025 (Online) 2nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Coaxial cable, a widely used wire medium offers and approximate frequency bandwidth of

A

750 GHz

B

750 Hz

C

750 MHz

D

750 kHz

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