NEET 2020 : Weekly Quiz 3 - 22.06.2019 for NEET & AIIMS Exams

Question 1

If n=6, the correct sequence for filling of electrons will be

Question 2

If the radius of first orbit of H atom is a₀, the de-Broglie wavelength of an electron in the third orbit is what time of

Question 3

The limiting line in Balmer series will have a frequency of (Rydberg constant, R_H=3.29 x 10¹⁵ cycles/s)

Question 4

What is the work function(in eV)of the metal if the light of wavelength 4000 Å generates photoelectrons of velocity

ms^–1 from it?
(Mass of electron =

kg
Velocity of light =

Planck’s constant =

Js
Charge of electron =

)

Question 5

The total number of orbitals associated with the principal quantum number 5 is:

Question 6

In an atom how many orbital (s) will have the quantum numbers;

and

?

Question 7

The electrons identified by quantum numbers n and l :
(a) n = 4, l = 1 (b) n = 4, l = 0 (c) n = 3, l = 2 (d) n = 3, l = 1
Can be placed in order of increasing energy as :

Question 8

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

Question 9

The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such a reaction will be:
(R = 8.314 JK^–1 mol^–1 and log 2 = 0.301)

Question 10

The half-life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be :

Question 11

The internal resistance of primary cell is 4Ω. It generates a current of 0.2 A in an external resistance of 21Ω. The rate at which chemical energy is consumed is providing the current is

Question 12

The magnetic flux linked with the coil varies with time as ϕ =3t² + 4t + 9. The magnitude of the induced emf of 2s is

Question 13

Two batteries of emf 4 v and 8 V with internal resistance 1Ω and 2Ω respectively are connected to an external resistance R = 9Ω as shown in figure. The current in circuit and the potential difference between P and Q respectively will be

Question 14

The correct graph respectively the relation between energy (E) of photoelectrons and frequency v of incident light is

Question 15

In

and

are electron and hole mobility, E be the applied electric field, the current density

for intrinsic semiconductor is equal to

Question 16

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

Question 17

The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is

Question 18

A spherical drop of capacitance 1μF is broken into eight drops of equal radius. Then, the capacitance of each small drop is

Question 19

A semiconductor having electron and hole mobilities

respectively.
If its intrinsic carrier density is

, then what will be the value of hole concentration P for which the conductivity will be minimum at a given temperature?

Question 20

In the given figure, potential difference between A and B is

Question 21

Blood fluke is

Question 22

True coelom appeared for the first time in which of the following:

Question 23

Which of the following animal has a closed circulatory system:

Question 24

In which one of the following phyla is the body segmented?

Question 25

In ectoparasitic leeches under phylum Annelida, beneath the muscular layer of body wall surrounding the alimentary canal is found the___________.

Question 26

Which among the following is metamerically segmented?

Question 27

Which of the following are correct?
(i) Sponges: Cellular level or organisation
(ii) Cnidaria: Tissue level of organisation
(iii) Platyhelminthes: Organ level of organisation
(iv) Annelids, Arthropods, Molluscs, Echinoderms and Chordates: Organ system level of organisation

Question 28

Which of the following is wrongly matched?

Question 29

Which of the following group is formed of only the hermaphrodite organisms?

Question 30

Which one of the following is a matching pair of a body feature and the animal possessing it?

Question 31

Read the following statements regarding methanogens and select the correct option.
(i) They are included in the group Archaebacteria.
(ii) They are responsible for the production of biogas in gobar gas plants.
(iii) They live in hot sulphur springs.
(iv) They are strictly anaerobic.

Question 32

Which of the following statement is incorrect w.r.t cyanobacteria

Question 33

During favourable conditions bacteria mainly reproduce by

Question 34

The mode of asexual reproduction in penicillium is through

Question 35

Select the sexual spores w.r.t. fungus

Question 36

Toad stools, puff balls and morels are similar in the presence of

Question 37

In five kingdom classification system, the kingdom that includes the blue-green algae, nitrogen-fixing bacteria and methanogenic archaebacteria is

Question 38

Which of these is not true about cyanobacteria?

Question 39

Find out the incorrect statement w.r.t. kingdom monera

Question 40

Prokaryotic organism with autotrophic and heterotrophic mode of nutrition belongs to how many kingdoms in Whittaker system?