1
TS EAMCET 2022 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

A generator produces a current of 100 A at 4000 V . The voltage is stepped up to $2 \times 10^5 \mathrm{~V}$ by a transformer before being sent on a high voltage transmission line of resistance $50 \Omega$. The percentage of power loss in the transmission line is

A

$0.25 \%$

B

$0.05 \%$

C

$1.25 \%$

D

$0.02 \%$

2
TS EAMCET 2022 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a plane EM wave, the electric field oscillates sinusoidally at a frequency of 30 MHz and amplitude $150 \mathrm{~V} / \mathrm{m}$, Identify the correct expression of $\mathbf{B}$ assuming the wave is propagating along $X$-axis and is oscillating along $Y$-axis.

A

$5 \times 10^{-7} \sin \left[\frac{x}{3}-6 \times 10^{+7} t\right] \hat{z} T$

B

$5 \times 10^{-7} \sin \left[\pi\left(\frac{x}{5}-6 \times 10^{+7} t\right)\right] \hat{\mathbf{z}} T$

C

$5 \times 10^{-7} \sin \left[\pi\left(\frac{x}{10}-3 \times 10^{+7} t\right)\right] \hat{z} T$

D

$5 \times 10^{-7} \sin \left[\pi\left(\frac{2 x}{5}-6 \times 10^{+8} t\right)\right] \hat{\mathbf{z}} T$

3
TS EAMCET 2022 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

When monochromatic light falls on a photo sensitive metal, an electron is emitted with maximum velocity $1.6 \times 10^6 \mathrm{~m} / \mathrm{s}$. Find the stopping potential.

[charge of electron $=1.6 \times 10^{-19} \mathrm{C}$, mass of electron $\left.=9 \times 10^{-31} \mathrm{~kg}\right]$

A

7.2 V

B

14.4 V

C

21.6 V

D

28.8 V

4
TS EAMCET 2022 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

A lamp of power 942 W radiates energy uniformly in all direction. The wavelength of radiation is 660 nm .The photon flux on a small screen 5.0 m from the lamp in units of photon $/ \mathrm{m}^2 \mathrm{~s} Q$ is

(take Planck's constant, $h=6.6 \times 10^{-34}$ SI unit)

A

$5 \times 10^{20}$

B

$2 \pi \times 10^{19}$

C

$\frac{6}{\pi} \times 10^{18}$

D

$1 \times 10^{19}$

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