1
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

In the fusion reaction,

$$ { }_1^2 \mathrm{H}+{ }_1^2 \mathrm{H} \longrightarrow{ }_2^3 \mathrm{He}+{ }_0^1 \mathrm{n} $$

the masses of deuteron, helium and neutron expressed in amu are 2.015, 3.017 and 1.009, respectively. If 1 kg of deuterium undergoes complete fusion, then find the amount of total energy released. ( $1 \mathrm{amu}=9315 \mathrm{MeV}$ )

A

$9 \times 10^{13} \mathrm{~J}$

B

$20 \times 10^5 \mathrm{~J}$

C

$4 \times 10^{22} \mathrm{~J}$

D

$5 \times 10^{15} \mathrm{~J}$

2
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

A steel wire of mass 4 g and length 80 cm is fixed at the two ends. The tension in the wire is 50 N , then the frequency of fourth harmonic is

A

250 Hz

B

500 Hz

C

700 Hz

D

1000 Hz

3
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

Ratio of powers of a convex and concave lens is $\frac{3}{2}$ and their equivalent focal length (when lenses are kept in constant) is 30 cm . Focal lengths of lenses are

A

$75 \mathrm{~cm},-50 \mathrm{~cm}$

B

$10 \mathrm{~cm},-15 \mathrm{~cm}$

C

$15 \mathrm{~cm},-10 \mathrm{~cm}$

D

$50 \mathrm{~cm},-75 \mathrm{~cm}$

4
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

The radius of the orbit of an electron in a Hydrogen-like atom is $45 a_0$, where $a_0$ is the Bohr radius. Its orbital angular momentum is $\frac{3 h}{2 \pi}$. It is given that $h$ is Planck constant and $R$ is Rydberg constant. The possible wavelength(s), when the atom de-excites, is (are)

A

$\frac{9}{32 R}$

B

$\frac{9}{16 R}$

C

$\frac{9}{15 R}$

D

$\frac{4}{3 R}$

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