Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

What is the optimum conditions required to study the conduction of electricity through gases.

2 / 45

Which one of the following is not the characteristic of Planck’s quantum theory of radiation ?

3 / 45

When a metal surface is exposed to solar radiations

4 / 45

The energy of electron in first energy level is - 21.79 x10-12 erg per atom. The energy of electron in second energy level is :

5 / 45

Which of the following statements do not form a part of Bohr’s model of hydrogen atom ?

6 / 45

Cathode rays are deflected by

7 / 45

Which is the correct schematic representation of the graph of black body radiation.


8 / 45

If the wavelength of the electromagnetic radiation is increased to thrice the digital value, then what will be the percent change in the value of frequency of the electromagnetic radiation.

9 / 45

Neutron is discovered by

10 / 45

For a Bohr atom angular momentum M of the electron is (n = 0, 1, 2, .....) :

11 / 45

Which of the following does not contain number of neutrons equal to that of 18Ar40 ?

12 / 45

Millikan performed an experiment method to determine which of the following ?

13 / 45

In the photo-electron emission, the energy of the emitted electron is

14 / 45

While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?

15 / 45

In photoelectric effect, at which frequency electron will be ejected with certain kinetic energy (υo = threshold frequency).

16 / 45

Which of the following scientists explained his model on the basis of centrifugal force ?

17 / 45

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given : ionization energy of H=2.18 ×10-18J atom–1and h = 6.625 ×10-34J s )

18 / 45

Number of protons, neutrons and electrons in the element 89X231 is

19 / 45

Rutherford’s experiment which established the nuclear model of the atom used a beam of

20 / 45

Which is correct statement about proton ?

21 / 45

Suppose beam containing all three fundamental subatomic particles are allowed to pass through an electric field as shown in figure. The subatomic particles detected at three points A, B and C on the screen respectively are ?

22 / 45

The radius of 1st Bohr’s orbit for hydrogen atom is ‘r’. The radius of second Bohr’s orbit is

23 / 45

Which one of the following pairs is not correctly matched ?

24 / 45

The value of Planck's constant is 6.63 × 10-34 Js. The velocity of light is 3.0 × 108 m s-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s-1 ?

25 / 45

In Bohr’s model, atomic radius of the first orbit is y, the radius of the 3rd orbit, is

26 / 45

When beryllium is bombarded with alpha particles (Chadwick’s experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are
given out. These are :

27 / 45

Nucleons are

28 / 45

Which of the scientist were able to prove that atom is no longer non-divisible?

29 / 45

Which of the following pairs will have same chemical properties ?

30 / 45

The ionisation potential of a hydrogen atom is –13.6 eV. What will be the energy of the atom corresponding to n = 2.

31 / 45

Which of the following statements about the electron is incorrect?

32 / 45

Arrange the following in terms of penetrating power. α-rays, β-rays, γ-rays

33 / 45

The ideal body, which emits and absorbs radiations of all frequencies, is called a black body and the radiation emitted by such a body is called

34 / 45

In a hydrogen atom, if energy of an electron in ground state is 13.6. eV, then that in the 2nd excited state is

35 / 45

Which of the following properties of atom could be explained correctly by Thomson Model of atom?

36 / 45

The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is

37 / 45

Which of the rays are not deflected by the electric and magnetic field ?

38 / 45

The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol-1; hence the energy of fourth Bohr orbit would be:

39 / 45

If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by

40 / 45

The number of electrons in [4019K]-1 is

41 / 45

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

42 / 45

What does negative sign in the electronic energy for hydrogen atom convey.

43 / 45

The first emission line of hydrogen atomic spectrum in the Balmer series appears is (R = Rydberg constant)

44 / 45

From the data given below A, B, C and D respectively are,

(A) 10 e-, atomic no. 11 (B) 10 e-, atomic no. 6
(C) 10 e-, atomic no. 10 (D) 10 e-, atomic no. 9

45 / 45

When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected. This is because

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