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NEET 2020 : Weekly Quiz 3 - 22.06.2019
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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, RH=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 = )
(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 :
(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)
(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?
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
(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.
(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?
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Oct 15NEET & AIIMS