1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

If the radius of first Bohr orbit is $r$, then the radius of the second Bohr orbit will be

A
8 r
B
$4 r$
C
$2 \sqrt{2} r$
D
$2 r$
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

$$ \text { Match the following types of nuclei with examples shown } $$

$$ \begin{array}{|l|l|} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { A. Isotopes } & \text { i. } \mathrm{Li}^7, \mathrm{Be}^7 \\ \hline \text { B. Isobars } & \text { ii. }{ }_8 \mathrm{O}^{18},{ }_9 \mathrm{~F}^{19} \\ \hline \text { C. Isotopes } & \text { iii. }{ }_1 \mathrm{H}^1,{ }_1 \mathrm{H}^2 \\ \hline \end{array} $$

A
A-ii, B-iii, C-i
B
A-i, B-iii, C-ii
C
A-iii, B-ii, C-i
D
A-iii, B-i, C-ii
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Which of the following statements is incorrect with reference of 'Nuclear force'?

A
Nuclear force becomes attractive for nucleon distances larger than 0.8 fm
B
Nuclear force becomes repulsive for nucleon distances less then 0.8 fm
C
Nuclear force is always attractive
D
Potential energy is minimum, if the separation between the nucleons is 0.8 fm
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

The range of electrical conductivity $(\sigma)$ and resistivity $(\rho)$ for metals, among the following, is

A
$$ \begin{aligned} & \rho \rightarrow 10^{-5}-10^{-6} \Omega \mathrm{~m} \\ & \sigma \rightarrow 10^5-10^{-6} \mathrm{Sm}^{-1} \end{aligned} $$
B
$$ \begin{aligned} & \rho \rightarrow 10^{11}-10^{19} \Omega \mathrm{~m} \\ & \sigma \rightarrow 10^{-11}-10^{-19} \mathrm{Sm}^{-1} \end{aligned} $$
C
$$ \begin{aligned} & \rho \rightarrow 10^2-10^8 \Omega \mathrm{~m} \\ & \sigma \rightarrow 10^{-2}-10^{-8} \mathrm{Sm}^{-1} \end{aligned} $$
D
$$ \begin{aligned} & \rho \rightarrow 10^{-2}-10^{-8} \Omega m \\ & \sigma \rightarrow 10^2-10^8 \mathrm{Sm}^{-1} \end{aligned} $$
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