1
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The shortest wavelength of X-rays emitted from an X-ray tube depends upon ........... .

A
nature of the gas in the tube
B
voltage applied to tube
C
current in the tube
D
nature of target of the tube
2
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a photocell is illuminated with a radiation of 1240 $$\mathop A\limits^o $$, the stopping potential is found to be 8V. Then, the work-function of the emitter and the threshold wavelength are

A
2 eV, 2000 $$\mathop A\limits^o $$
B
2 eV, 6200 $$\mathop A\limits^o $$
C
2 eV, 2480 $$\mathop A\limits^o $$
D
3 eV, 6200 $$\mathop A\limits^o $$
3
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The wavelength of the first spectral line of the Lyman series of hydrogen spectrum is

A
912 $$\mathop A\limits^o $$
B
1215 $$\mathop A\limits^o $$
C
1512 $$\mathop A\limits^o $$
D
6563 $$\mathop A\limits^o $$
4
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following nuclear reactions is possible?

A
$${ }_5 \mathrm{~B}^{10}+{ }_2 \mathrm{He}^4 \longrightarrow{ }_7 \mathrm{~N}^{13}+{ }_1 \mathrm{H}^1$$
B
$${ }_{11} \mathrm{Na}^{24}+{ }_1 \mathrm{H}^1 \longrightarrow{ }_{10} \mathrm{Ne}^{20}+{ }_2 \mathrm{He}^4$$
C
$${ }_{93} \mathrm{~Np}^{239} \longrightarrow{ }_{94} \mathrm{Pu}^{239}+\beta^{-}+\gamma^{-}$$
D
$${ }_7 \mathrm{~N}^{11}+{ }_1 \mathrm{H}^1 \longrightarrow{ }_6 \mathrm{C}^{12}+\beta^{-}+\gamma^{-}$$