Question 1: Palette 1/82

TS-EAMCET 2025 MCQ

The maximum wavelength of incident radiation required to ionize a hydrogen atom in its ground state is nearly

A

912 nm

B

$1215 \mathop {\rm{A}}\limits^{\rm{o}}$

C

$912 \mathop {\rm{A}}\limits^{\rm{o}}$

D

1215 nm

Question 2: Palette 2/82

TS-EAMCET 2025 MCQ

When an element ${ }_{90}^{232} \mathrm{Th}$ decays into ${ }_{82}^{208} \mathrm{~Pb}$, the number of $\alpha$ and $\beta^{-}$particles emitted respectively are

A

4,8

B

8,2

C

6,2

D

6, 4

Question 3: Palette 3/82

TS-EAMCET 2025 MCQ

During the disintegration of a radioactive nucleus of mass number 208 at rest, two alpha particles each with kinetic energy $E$ are emitted. The total kinetic energy of the emitted alpha particles and the daughter nucleus after the disintegration is

A

$\frac{51 E}{25}$

B

$\frac{51 E}{50}$

C

$\frac{52 E}{25}$

D

$\frac{26 E}{25}$

Question 4: Palette 4/82

TS-EAMCET 2025 MCQ

If the total energy of an electron in an orbit is positive, then

A

electron will revolve in a circular orbit.

B

electron will revolve in an elliptical orbit.

C

electron will not follow a closed orbit.

D

electron will fall into the nucleus.

Question 5: Palette 5/82

TS-EAMCET 2025 MCQ

If $87.5 \%$ of atoms of a radioactive element decay in 6 days, then the fraction of atoms of the element that decay in 8 days is

A

$1 / 8$

B

$\frac{7}{8}$

C

$1 / 16$

D

$15 / 16$

Question 6: Palette 6/82

TS-EAMCET 2025 MCQ

If the ratio of the mass numbers of two nuclei is $27: 125$, then the ratio of their surface areas is

A

$3: 5$

B

$9: 25$

C

$27: 125$

D

$1: 1$

Question 7: Palette 7/82

TS-EAMCET 2025 MCQ

The range of weak nuclear force is of the order of

A

$10^{16} \mathrm{~m}$

B

$10^{-10} \mathrm{~m}$

C

$10^{10} \mathrm{~m}$

D

$10^{-16} \mathrm{~m}$

Question 8: Palette 8/82

TS-EAMCET 2025 MCQ

The potential energy of an electron in an orbit of hydrogen atom is -6.8 eV . The de-Broglie wavelength of the electron in this orbit is

( $r_o$ is Bohr radius)

A

$2 \pi r_0$

B

$4 \pi r_0$

C

$\pi r_0$

D

$3 \pi r_0$

Question 9: Palette 9/82

TS-EAMCET 2025 MCQ

If a radioactive substance decays $10 \%$ in every 16 hours, then the percentage of the radioactive substance that remains after 2 days is

A

82.2

B

18.8

C

27.1

D

72.9

Question 10: Palette 10/82

TS-EAMCET 2025 MCQ

If a nucleus $P$ converts into a nucleus $Q$ by the decay of one alpha particle and two $\beta^{-}$particles, then the nuclei $P$ and $Q$ are

A

isotopes

B

isobars

C

isotones

D

isomers

Question 11: Palette 11/82

TS-EAMCET 2025 MCQ

The phenomenon of physics that deals with the constitution and structure of matter at the minute scales of atoms and nuclei is

A

microscopic domain

B

macroscopic domain

C

classical physics

D

thermodynamics

Question 12: Palette 12/82

TS-EAMCET 2025 MCQ

The ratio of wavelengths of second line in Balmer series and the first line in Lyman series of hydrogen atom is

A

$2: 1$

B

$9: 4$

C

$4: 1$

D

$3: 2$

Question 13: Palette 13/82

TS-EAMCET 2025 MCQ

A radioactive material of half-life 2.5 hours emits radiation that is 32 times the safe maximum level. The time (in hours) after which the material can be handled safely is

A

10

B

25

C

5

D

12.5

Question 14: Palette 14/82

TS-EAMCET 2025 MCQ

If the number of uranium nuclei required per hour to produce a power of 64 kW is $7.2 \times 10^{18}$, then the energy released per fission is

A

$0.64 \times 10^{-10} \mathrm{~J}$

B

$3.2 \times 10^{-13} \mathrm{~J}$

C

$0.32 \times 10^{-10} \mathrm{~J}$

D

$3.2 \times 10^{-10} \mathrm{~J}$

Question 15: Palette 15/82

TS-EAMCET 2025 MCQ

Bose-Einstein statistics is applicable to particles with

A

even integral spin particles only

B

integral spin particles

C

half odd integral spin particles

D

odd integral spin particles only

Question 16: Palette 16/82

TS-EAMCET 2025 MCQ

The ratio of the kinetic energies of the electrons in the third and fourth excited states of hydrogen atom is

A

$4: 3$

B

$16: 9$

C

$25: 16$

D

$5: 4$

Question 17: Palette 17/82

TS-EAMCET 2025 MCQ

In $\beta^{-}$decay, a neutron transforms into a proton within the nucleus according to the equation :

neutron $\rightarrow$ proton $+\beta^{-}+x$

In this equation the particle represented by ' $x$ ' is

A

Neutrino

B

Anti neutrino

C

Positron

D

Meson

Question 18: Palette 18/82

TS-EAMCET 2025 MCQ

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

$1: 8$

Question 19: Palette 19/82

TS-EAMCET 2025 MCQ

If the difference in the frequencies of the first and second lines of Lyman series of hydrogen atom is $f$, then the difference in frequencies of the first and second lines of Balmer series of hydrogen atom is

A

$\frac{3 f}{4}$

B

$f$

C

$\frac{7 f}{20}$

D

$\frac{9 f}{16}$

Question 20: Palette 20/82

TS-EAMCET 2025 MCQ

The average energy of a neutron produced in the fission of ${ }_{92}^{235} \mathrm{U}$ is

A

$160 \times 10^{-13} \mathrm{~J}$

B

$320 \times 10^{-15} \mathrm{~J}$

C

$320 \times 10^{-13} \mathrm{~J}$

D

$160 \times 10^{-15} \mathrm{~J}$

Question 21: Palette 21/82

TS-EAMCET 2025 MCQ

If $96.875 \%$ of a radioactive substance decays in 10 days, then the half life of the substance is (in days)

A

10

B

5

C

4

D

2

Question 22: Palette 22/82

TS-EAMCET 2024 MCQ

In hydrogen atom, the frequency of the photon emitted when an electron jumps from second orbit to first orbit is $f$. The frequency of the photon emitted when an electron jumps from third excited state to first excited state is

A

$\frac{f}{2}$

B

$\frac{f}{4}$

C

$\frac{f}{8}$

D

$f$

Question 23: Palette 23/82

TS-EAMCET 2024 MCQ

If the ratio of the radii of nuclei ${ }_{52} X^{A}$ and ${ }_{13} \mathrm{AI}^{27}$ is $5: 3$, then the number of neutrons in the nucleus $X$ is

A

52

B

63

C

27

D

73

Question 24: Palette 24/82

TS-EAMCET 2024 MCQ

Half-life periods of two nuclei $A$ and $B$ are $T$ and $2 T$ respectively. Initially $A$ and $B$ have same number of nuclei. After a time of $4 T$, the ratio of the remaining number of nuclei of $A$ and $B$ is

A

$1: 16$

B

$1: 4$

C

$1: 1$

D

$1: 2$

Question 25: Palette 25/82

TS-EAMCET 2024 MCQ

The ground state energy of hydrogen atom is -13.6 cv . The potential energy of the electron in the first excited state of hydrogen is

A

-6.8 eV

B

-3.4 eV

C

-13.6 eV

D

-272 eV

Question 26: Palette 26/82

TS-EAMCET 2024 MCQ

After the decay of a single $\beta$-particle, the parent and daughter nuclei are

A

isotopes

B

isobars

C

isomers

D

isotones

Question 27: Palette 27/82

TS-EAMCET 2024 MCQ

$\mathrm{A}_{92} \mathrm{U}^{238}$ nucleus decays to a ${ }_{82} \mathrm{~Pb}^{214}$ nucleus. The number of $\alpha$ and $\beta^{-}$particles emitted are

A

6 and 2

B

3 and 3

C

2 and 6

D

3 and 4

Question 28: Palette 28/82

TS-EAMCET 2024 MCQ

The ratio of the centripetal accelerations of the electron in two successive orbits of hydrogen is $81: 16$. Due to ${ }^3$ transition between these two states, the angular momentum of the electron changes by ( $h=$ Planck's constant)

A

$\frac{h}{3 \pi}$

B

$\frac{3 h}{\pi}$

C

$\frac{h}{2 \pi}$

D

$\frac{2 h}{\pi}$

Question 29: Palette 29/82

TS-EAMCET 2024 MCQ

The operation of a nuclear reactor is said to be critical when the value of neutron multiplication factor $K i s$

A

$K=0$

B

$K=1$

C

$K>1$

D

$0

Question 30: Palette 30/82

TS-EAMCET 2024 MCQ

An $\alpha$-particle of energy $E$ is liberated during the decay of a nucleus of mass number 236. The total energy released in this process is

A

58 E

B

$59 E$

C

$\frac{58 E}{59}$

D

$\frac{59 E}{58}$

Question 31: Palette 31/82

TS-EAMCET 2024 MCQ

The related effort to derive the properties of a bigger, more complex system from the properties and interactions of its constituent simpler parts is

A

unification

B

reductionism

C

classical approach

D

quantum approach

Question 32: Palette 32/82

TS-EAMCET 2024 MCQ

The ratio of the wavelengths of radiation emitted when an electron in the hydrogen atom jumps from 4th orbit to 2 nd orbit and from 3rd orbit to 2 nd orbit is

A

$27: 25$

B

$20: 25$

C

$20: 27$

D

$25: 27$

Question 33: Palette 33/82

TS-EAMCET 2024 MCQ

The half lives of two radioactive material $A$ and $B$ are respectively $T$ and $2 T$. If the ratio of the initial masses of the materials $A$ and $B$ is $8: 1$. Then, the time after which the ratio of the masses of the materials $A$ and $B$ becomes $4: 1$ is

A

$2 T$

B

$T$

C

$4 T$

D

$8 T$

Question 34: Palette 34/82

TS-EAMCET 2024 MCQ

The energy released by the fission of one uranium nucleus is 200 MeV . The number of fissions per second required to produce 128 W power is

A

$6 \times 10^{12}$

B

$8 \times 10^{12}$

C

$2 \times 10^{12}$

D

$4 \times 10^{12}$.

Question 35: Palette 35/82

TS-EAMCET 2024 MCQ

At room temperature, gaseous hydrogen is bombarded with a beam of electrons of 13.6 eV energy. The series to which the emitted spectral line belongs to

A

Lyman series

B

Balmer series

C

Paschen series

D

Ptund series

Question 36: Palette 36/82

TS-EAMCET 2024 MCQ

The half-life of a radioactive substance is 12 min . The time gap between $28 \%$ decay and $82 \%$ decay of the radioactive substance is

A

6 min

B

18 min

C

12 min

D

24 min

Question 37: Palette 37/82

TS-EAMCET 2024 MCQ

An element consists of a mixture of three isotopes $A, B$ and $C$ of masses $m_1, m_2$ and $m_3$, respectively. If the relative abundances of the three isotopes $A, B$ and $C$ are in the ratio $2: 3: 5$, the average mass of the element is

A

$0.2 m_1+0.3 m_2+0.5 m_3$

B

$2 m_1+3 m_2+5 m_3$

C

$0.4 m_1+0.6 m_2+m_3$

D

$4 m_1+6 m_2+10 m_3$

Question 38: Palette 38/82

TS-EAMCET 2023 MCQ

Match the following.

(Take the relative strength of the strongest fundamental forces in nature as one)

List-I (Fundamental forces in nature)		List-II (Relative strength)
(A)	Strong nuclear force	(e)	$10^{-2}$
(B)	Weak nuclear force	(f)	1
(C)	Electromagnetic force	(g)	$10^{10}$
(D)	Gravitational force	(h)	$10^{-13}$
		(i)	$10^{-39}$

A

A-f, B-i, C-e, D-h

B

A-f, B-h, C-e, D-g

C

A-f, B-h, C-e, D-i

D

A-f, B-e, C-h, D-i

Question 39: Palette 39/82

TS-EAMCET 2023 MCQ

Energy released in the fission of a single uranium nucleus is 200 MeV . Then the number of fissions per second to produce 5 mW power is

A

$1.56 \times 10^8$

B

$1.56 \times 10^{13}$

C

$3.12 \times 10^8$

D

$3.12 \times 10^{13}$

Question 40: Palette 40/82

TS-EAMCET 2023 MCQ

The ratio of longest wavelengths of the spectral lines in the Lyman and Balmer series of hydrogen spectrum is

A

$\frac{3}{23}$

B

$\frac{5}{27}$

C

$\frac{7}{29}$

D

$\frac{9}{31}$

Question 41: Palette 41/82

TS-EAMCET 2023 MCQ

Half-life of a radioactive substance $A$ is two times the half-life of another radioactive substance $B$. Initially the number of nuclei of $A$ and $B$ are $N_A$ and $N_B$ respectively. After three half-lives of $A$, the number of nuclei of both are equal. Then $N_A / N_B$ is

A

$1 / 3$

B

$1 / 4$

C

$1 / 6$

D

$\frac{1}{8}$

Question 42: Palette 42/82

TS-EAMCET 2023 MCQ

The ratio of the relative strengths of strong and weak nuclear forces is

A

$10^{13}$

B

$10^{26}$

C

$10^{39}$

D

$10^{11}$

Question 43: Palette 43/82

TS-EAMCET 2023 MCQ

In a hypothetical Bohr hydrogen atom, if the mass of the electron is doubled then the energy of the electron in the first orbit is

A

-27.2 eV

B

-13.6 eV

C

-6.8 eV

D

-3.4 eV

Question 44: Palette 44/82

TS-EAMCET 2023 MCQ

The half-life period of element $X$ is same as the mean life time of element $Y$. Assume initially $X$ and $Y$ have same number of atoms. Then

A

Initially $X$ and $Y$ have same decay rates

B

Always $X$ and $Y$ decay at same rate

C

$Y$ decay faster than $X$

D

$X$ decays faster than $Y$

Question 45: Palette 45/82

TS-EAMCET 2023 MCQ

Heavy water is used as moderator in nuclear reactor because

A

it controls the energy released in the reactor

B

it absorbs neutrons and stops chain reaction

C

it cools the reactor faster

D

it slows down the fast moving neutrons

Question 46: Palette 46/82

TS-EAMCET 2023 MCQ

The radius of a nucleus of mass number 27 is $R$. Which of the following is true about a nucleus whose radius is $2 R$ ?

A

It is stable in nature

B

Its mass number is 54

C

It is likely to undergo fission reaction

D

It is likely to undergo fusion reaction

Question 47: Palette 47/82

TS-EAMCET 2023 MCQ

The nucleus ${ }_{50}^{120} X$ undergoes the series of reactions given below:

$ { }_Z^A X \xrightarrow{\alpha \text {-decay }} P \xrightarrow{\beta^{-} \text {-decay }} Q \xrightarrow{\alpha \text {-decay }} R $

The number of neutrons in the nucleus $R$ is

A

$A-5$

B

$A-Z-5$

C

A - 9

D

$A-Z-4$

Question 48: Palette 48/82

TS-EAMCET 2023 MCQ

In hydrogen spectrum, the shortest and longest wavelengths of Balmer series are $\lambda_1$ and $\lambda_2$ respectively. The Rydberg constant of hydrogen is

A

$\frac{1}{\lambda_1}-\frac{9}{\lambda_2}$

B

$\frac{4}{\lambda_1}-\frac{9}{\lambda_2}$

C

$\frac{9}{\lambda_1}-\frac{9}{\lambda_2}$

D

$\frac{9}{\lambda_1}-\frac{4}{\lambda_2}$

Question 49: Palette 49/82

TS-EAMCET 2023 MCQ

$\alpha$-decay of a parent nucleus $X$ results in a daughter nucleus $Y$. If $m_x, m_y$ and $m_\alpha$ are the masses of the parent nucleus, the daughter nucleus and the $\alpha$-particles respectively, then the net kinetic energy gained in the process is

A

$\left(m_x+m_\alpha-m_y\right) c^2$

B

$\left(m_x-m_y-m_\alpha\right) c^2$

C

$\left(m_x+m_y+m_\alpha\right) c^2$

D

$\left(m_x+m_y-m_\alpha\right) c^2$

Question 50: Palette 50/82

TS-EAMCET 2023 MCQ

In the nuclear fission of one nucleus of $\mathrm{U}^{235}$ the energy released is 188 MeV . The energy released in the nuclear fission of 235 g of $\mathrm{U}^{235}$ is nearly

(Avogadro number $=6.02 \times 10^{23} \mathrm{~mol}^{-1}$ )

A

$28.8 \times 10^{12} \mathrm{~J}$

B

$23.5 \times 10^{12} \mathrm{~J}$

C

$36.2 \times 10^{12} \mathrm{~J}$

D

$18.11 \times 10^{12} \mathrm{~J}$

Question 51: Palette 51/82

TS-EAMCET 2023 MCQ

If $F_1$ and $F_2$ are the relative strengths of the gravitational and weak nuclear forces respectively, then $F_2 / F_1$ is nearly

A

100

B

$10^{39}$

C

$10^{13}$

D

$10^{26}$

Question 52: Palette 52/82

TS-EAMCET 2023 MCQ

The ratio of the energies of the electron in the hydrogen atom in the first and second excited states is

A

$9: 4$

B

$4: 1$

C

$8: 1$

D

$1: 8$

Question 53: Palette 53/82

TS-EAMCET 2023 MCQ

In the following nuclear reaction $X$ is

$ { }_{13} \mathrm{Al}^{27}+{ }_2 \mathrm{He}^4 \longrightarrow{ }_0 n^1+X $

A

${ }_{15} \mathrm{P}^{31}$

B

${ }_{14} \mathrm{Si}^{30}$

C

${ }_{15} \mathrm{P}^{30}$

D

${ }_{15} \mathrm{Si}^{31}$

Question 54: Palette 54/82

TS-EAMCET 2023 MCQ

Nuclear fission and fusion can be explained on the basis of

A

Einstein's theory of relativity

B

Einstein specific heat equation

C

Einstein mass-energy equation

D

Einstein photoelectric equation

Question 55: Palette 55/82

TS-EAMCET 2023 MCQ

If $F_1, F_2$ and $F_3$ are the relative strengths of the gravitational, the weak nuclear and the electromagnetic forces respectively, then

A

$F_1>F_2>F_3$

B

$F_1 < F_2 < F_3$

C

$F_1=F_2=F_3$

D

$F_2>F_3>F_1$

Question 56: Palette 56/82

TS-EAMCET 2023 MCQ

If an electron is moving in the 4th orbit of the hydrogen atom, then the angular momentum of the electron in SI unit is

A

$\frac{h}{\pi}$

B

$\frac{2 h}{\pi}$

C

$\frac{4 h}{\pi}$

D

$\frac{h}{2 \pi}$

Question 57: Palette 57/82

TS-EAMCET 2023 MCQ

The energy equivalent to a mass of 1 kg is

A

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

B

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

C

$9 \times 10^{16} \mathrm{~J}$

D

$9 \times 10^6 \mathrm{~J}$

Question 58: Palette 58/82

TS-EAMCET 2023 MCQ

If $S$ is the surface area of a nucleus of mass number $A$, then

A

$S \propto A$

B

$S \propto A^{1 / 3}$

C

$S \propto A^2$

D

$S \propto A^{2 / 3}$

Question 59: Palette 59/82

TS-EAMCET 2022 MCQ

Among the fundamental forces, which one of the following is the strongest force?

A

Electromagnetic force

B

Strong Nuclear force

C

Gravitational force

D

Weak nuclear force

Question 60: Palette 60/82

TS-EAMCET 2022 MCQ

The shortest wavelength in Balmer series of hydrogen atom spectrum is approximately equal to (use $R_H=1.097 \times 10^7 \mathrm{~m}^{-1}$ )

A

3646 A

B

912 A

C

364.6 A

D

91.2 A

Question 61: Palette 61/82

TS-EAMCET 2022 MCQ

What will be the energy released in joule, in the process of fission by 1 mg of ${ }_{92}^{240} \mathrm{U}$. Assume energy release per fission is 200 MeV .

[use Avogadro's number as $6 \times 10^{23}$ and 1 eV $=1.6 \times 10^{-19} \mathrm{~J}$ ]

A

$62 \times 10^7 \mathrm{~J}$

B

$7.0 \times 10^7 \mathrm{~J}$

C

$8.0 \times 10^7 \mathrm{~J}$

D

$82 \times 10^7 \mathrm{~J}$

Question 62: Palette 62/82

TS-EAMCET 2022 MCQ

Which of the following statements is true?

A

The range for weak nuclear force is shortest among all four forces.

B

The range for electromagnetic force is smaller than that for gravitation force.

C

The relative strength of gravitational force is higher than that for weak nuclear force.

D

The relative strength for weak nuclear force is larger than that for strong nuclear force.

Question 63: Palette 63/82

TS-EAMCET 2022 MCQ

The energy of an electron in the fourth excited state of the hydrogen atom is

A

-0.85 eV

B

-1.70 eV

C

0

D

-0.425 eV

Question 64: Palette 64/82

TS-EAMCET 2022 MCQ

Estimate the approximate volume of aluminium nucleus $(A=27)$, use $\binom{R_0 \simeq 1.0 \times 10^{-15} \mathrm{~m}}{\pi \simeq 3}$

A

$1 \times 10^{-13}(\mathop {\rm{A}}\limits^{\rm{o}})^3$

B

$1 \times 10^{-10}(\mathop {\rm{A}}\limits^{\rm{o}})^3$

C

$1 \times 10^{-15}(\mathop {\rm{A}}\limits^{\rm{o}})^3$

D

$1 \times 10^{-17}(\mathop {\rm{A}}\limits^{\rm{o}})^3$

Question 65: Palette 65/82

TS-EAMCET 2022 MCQ

The range of the nuclear force is

A

$10^{-18} \mathrm{~m}$

B

$10^{-16} \mathrm{~m}$

C

$10^{-15} \mathrm{~m}$

D

$10^{-13} \mathrm{~m}$

Question 66: Palette 66/82

TS-EAMCET 2022 MCQ

Considering the Bohr's model of hydrogen atom, the ratio of velocities of electrons orbiting in the 4th orbit to that in the 9 th orbit is

A

$9: 4$

B

$3: 2$

C

$2: 3$

D

$4: 9$

Question 67: Palette 67/82

TS-EAMCET 2022 MCQ

What is the mass number of the nucleus having radius equal to $\frac{1}{3}$ of that of ${ }^{189} \mathrm{Os}$ ?

A

20

B

7

C

12

D

14

Question 68: Palette 68/82

TS-EAMCET 2022 MCQ

The difference in the wavelength between the maximum and minimum of Balmer series (use $R_H=1 \times 10^7 \mathrm{~m}^{-1}$ )

A

$1600 \mathop {\rm{A}}\limits^{\rm{o}}$

B

$3200\mathop {\rm{A}}\limits^{\rm{o}}$

C

$4000 \mathop {\rm{A}}\limits^{\rm{o}}$

D

$4800\mathop {\rm{A}}\limits^{\rm{o}}$

Question 69: Palette 69/82

TS-EAMCET 2022 MCQ

The radius and mass number of nucleus 1 is $R_1$ and $A_1$, respectively. The radius and mass number of nucleus 2 is $R_2$ and $A_2$, respectively. If $A_2$ is larger than $A_1$ by $2 \%$, then $R_2$ is larger than $R_1$ by

A

$\frac{2}{3} \%$

B

$1 \%$

C

$8 \%$

D

$\frac{3}{2} \%$

Question 70: Palette 70/82

TS-EAMCET 2022 MCQ

Which of the following interaction is responsible for beta decay?

A

Gravitational

B

Weak

C

Electromagnetic

D

Strong

Question 71: Palette 71/82

TS-EAMCET 2022 MCQ

If the series limit frequency of Balmer series is $v_B$, then the series limit frequency of the Brackett series is

A

$\frac{4 v_B}{25}$

B

$\frac{V_B}{9}$

C

$\frac{V_B}{4}$

D

$\frac{9 v_B}{4}$

Question 72: Palette 72/82

TS-EAMCET 2022 MCQ

Consider a nucleus ${ }_{30}^{60} \mathrm{X}$. Its approximate density is (take, $1 \mathrm{amu}=1.6 \times 10^{-27} \mathrm{~kg}, R_0=1.2 \times 10^{-15} \mathrm{~m}$ )

A

$12 \times 10^{18} \mathrm{~kg} / \mathrm{m}^3$

B

$18.5 \times 10^{19} \mathrm{~kg} / \mathrm{m}^3$

C

$3.3 \times 10^{16} \mathrm{~kg} / \mathrm{m}^3$

D

$22 \times 10^{17} \mathrm{~kg} / \mathrm{m}^3$

Question 73: Palette 73/82

TS-EAMCET 2022 MCQ

As the mass number $A$ increases, which of the following quantities related to a nucleus does not change?

A

Mass

B

Volume

C

Density

D

Binding energy

Question 74: Palette 74/82

TS-EAMCET 2020 MCQ

The binding energy (BE) per nucleon for an element is 7.14 MeV . If the BE of element is 28.6 MeV , then the number of nucleons in the element is

A

4

B

8

C

16

D

32

Question 75: Palette 75/82

TS-EAMCET 2020 MCQ

If the first line in the Lyman series has wavelength $\lambda$, then the first line in Balmer series has the wavelength

A

$\frac{27}{5} \lambda$

B

$\frac{32}{27} \lambda$

C

$\frac{28}{21} \lambda$

D

$\frac{15}{4} \lambda$

Question 76: Palette 76/82

TS-EAMCET 2020 MCQ

The half-life of a radiocative isotope is 30 h . How long will it take to get reduced to $12.5 \%$ of its initial amount?

A

120 h

B

90 h

C

60 h

D

50 h

Question 77: Palette 77/82

TS-EAMCET 2020 MCQ

In atomic scale the weakest force in nature is

A

strong force

B

electromagnetic force

C

gravitational force

D

weak force

Question 78: Palette 78/82

TS-EAMCET 2020 MCQ

The wavelength of a spectral line emitted by hydrogen atom in the Balmer series is $\frac{16}{3 R}$

( $R$ is Rydberg constant). What is the value of the principal quantum number of the state from which the transition takes place?

A

2

B

3

C

4

D

5

Question 79: Palette 79/82

TS-EAMCET 2020 MCQ

The half-life of a radioactive sample is 5 s . If the initial mass of the sample is 60 g , then the time required to reduce the sample to 7.5 g is

A

15 s

B

75 s

C

7.5 s

D

10 s

Question 80: Palette 80/82

TS-EAMCET 2020 MCQ

The nuclear forces are

A

long range repulsive forces

B

long range attractive forces

C

short range attractive forces

D

short range repulsive forces

Question 81: Palette 81/82

TS-EAMCET 2020 MCQ

The ratio of maximum to minimum wavelength in Balmer series of an hydrogenic atom is

A

$9 / 5$

B

$12 / 7$

C

$9 / 7$

D

$14 / 9$

Question 82: Palette 82/82

TS-EAMCET 2020 MCQ

Alpha rays emitted from a radioactive substance are

A

negatively charged particles

B

doubly ionised helium atoms

C

ionised hydrogen nuclei

D

uncharged particles