1. The circuit represents a full wave bridge rectifier when switch \(S\) is open. The output voltage \((\text V_0)\) pattern across \(R_L\) when \(S\) is closed:
2. The fraction of the original number of radioactive atoms that disintegrates (decays) during the average lifetime of a radioactive substance will be:
1. \(\frac{1}{e}\)
2. \(\frac{1}{1+e}\)
3. \(\frac{e-1}{e+1}\)
4. \(\frac{e-1}{e}\)
3. The sliding contact
\(C\) is at one fourth of the length of the potentiometer wire (
\(AB\)) from
\(A\) as shown in the circuit diagram. If the resistance of the wire
\(AB\) is
\(R_0\), then the potential drop (
\(V\)) across the resistor
\(R\) is:
| 1. |
\(\dfrac{4V_0R}{3R_0+16R}\) |
2. |
\(\dfrac{4V_0R}{3R_0+R}\) |
| 3. |
\(\dfrac{2V_0R}{4R_0+R}\) |
4. |
\(\dfrac{2V_0R}{2R_0+3R}\) |
4. An AC source given by \(V=V_m\sin(\omega t)\) is connected to a pure inductor \(L\) in a circuit and \(I_m\) is the peak value of the AC current. The instantaneous power supplied to the inductor is:
| 1. |
\(\dfrac{V_mI_m}{2}\mathrm{sin}(2\omega t)\) |
2. |
\(-\dfrac{V_mI_m}{2}\mathrm{sin}(2\omega t)\) |
| 3. |
\({V_mI_m}\mathrm{sin}^{2}(\omega t)\) |
4. |
\(-{V_mI_m}\mathrm{sin}^{2}(\omega t)\) |
5. Given below are two statements:
| Assertion (A): |
The stretching of a spring is determined by the shear modulus of the material of the spring. |
| Reason (R): |
A coil spring of copper has more tensile strength than a steel spring of the same dimensions. |
| 1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. |
(A) is False but (R) is True. |
| 4. |
(A) is True but (R) is False. |
6. Given below are two statements:
| Assertion (A): |
When a firecracker (rocket) explodes in mid-air, its fragments fly in such a way that they continue moving in the same path, which the firecracker would have followed, had it not exploded. |
| Reason (R): |
The explosion of cracker (rocket) occurs due to internal forces only and no external force acts for this explosion. |
| 1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. |
(A) is True but (R) is False. |
| 4. |
(A) is False but (R) is True. |
7. Two amplifiers of voltage gain 20 each, are cascaded in series. If 0.01 volt a.c. input signal is applied across the first amplifier, the output a.c. signal of the second amplifier in volts is:
1. 2.0
2. 4.0
3. 0.01
4. 0.20
8. The volume occupied by the molecules contained in \(4.5~\text{kg}\) water at STP, if the molecular forces vanish away, is:
1. \(5.6~\text{m}^3\)
2. \(5.6\times10^{6}~\text{m}^3\)
3. \(5.6\times10^{3}~\text{m}^3\)
4. \(5.6\times10^{-3}~\text{m}^3\)
9. In a gravitational field, the gravitational potential is given by;
\(V=-\frac{K}{x}~\text{J/kg}.\) The gravitational field intensity at the point
\((2,0,3)~\text m\) is:
| 1. |
\(+\dfrac K2\) |
2. |
\(-\dfrac{K}{2}\) |
| 3. |
\(-\dfrac{K}{4}\) |
4. |
\(+\dfrac K4\)
|
10. The dimensions \([MLT^{-2}A^{-2}]\) belong to the:
1. electric permittivity
2. magnetic flux
3. self-inductance
4. magnetic permeability
11. An ideal gas follows a process described by the equation
\(PV^2=C\) from the initial
\((P_1, V_1, T_1)\) to final
\((P_2, V_2, T_2)\) thermodynamics states, where
\(C\) is a constant. Then:
| 1. |
\(\text{If}~P_1>P_2~\text{then}~T_1<T_2\) |
| 2. |
\(\text{If}~V_2>V_1~\text{then}~T_2>T_1\) |
| 3. |
\(\text{If}~V_2>V_1~\text{then}~T_2<T_1\) |
| 4. |
\(\text{If}~P_1>P_2~\text{then}~V_1>V_2\) |
12. Select the correct option based on statements below:
| Assertion (A): |
In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells. |
| Reason (R): |
In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality. |
| 1. |
(A) is false but (R) is true. |
| 2. |
Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. |
Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. |
(A) is true but (R) is false. |
13. When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 × 105 J mol–1. The minimum energy needed to remove one mole of electron from the metal is:
(h = 6.626 × 10–34 Js, c = 3 × 108 ms–1, NA = 6.022 × 1023 mol–1)
1. 2.31 × 106 J mol–1
2. 3.84 × 104 J mol–1
3. 3.84 × 10–19 J mol–1
4. 2.31 × 105 J mol–1
14. What is the hybridization shown by C
1 and C
2 carbons, respectively in the given compound?
\(\mathrm{ OHC-CH=CH-{^2}CH_2-{^1}COOCH_3}\)
| 1. |
sp2 and sp3 |
2. |
sp2 and sp2 |
| 3. |
sp3 and sp2 |
4. |
sp3 and sp3 |
15. Fluorine is a stronger oxidizing agent than chlorine because:
| (a) |
F–F bond has a low enthalpy of dissociation. |
| (b) |
Flouride ion (F–) has high hydration enthalpy. |
| (c) |
Electron gain enthalpy of fluorine is less negative than chlorine. |
| (d) |
Fluorine has a very small size. |
Choose the most appropriate answer from the options given :
| 1. |
(a) and (b) only |
2. |
(a) and (c) only |
| 3. |
(a) and (d) only |
4. |
(b) and (c) only |
16. Find the emf of the cell in which the following reaction takes place at 298 K:
\(\mathrm{Ni}(\mathrm{s})+2 \mathrm{Ag}^{+}(0.001 \mathrm{M}) \rightarrow \mathrm{Ni}^{2+}(0.001 \mathrm{M})+2 \mathrm{Ag}(\mathrm{s}) \)
\( \small{\text { (Given that } \mathrm{E}_{\text {cell }}^{\circ}=10.5 \mathrm{~V}, \frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \text { at } \ 298 \mathrm{~K})} \)
1. 1.05 V
2. 1.0385 V
3. 1.385 V
4. 0.9615 V
17. Chlorine shows the bleaching action in the presence of moisture due to the formation of
1. HOCl
2. HOClO
3. H2O2
4. O
18. The pollution due to oxides of sulphur gets enhanced due to the presence of :
a. particulate matter
b. ozone
c. hydrocarbons
d. hydrogen peroxide
Choose the most appropriate answer from the options given below:
1. a, c, d only
2. a, d only
3. a , b, d only
4. b, c, d only
19. Given below are half-cell reactions:
\(\text{MnO}_{4}^{-}+8 \text{H}^{+}+5 \text{e}^{-} \rightarrow \text{Mn}^{2+}+4 \text{H}_{2} \text{O}, \)
\( \text{E}_{\text{Mn}^{2+}}^{\circ} / \text{MnO}_{4}^{-}=-1.510 \text{ V} \)
\( \frac{1}{2} \text{O}_{2}+2 \text{H}^{+}+2 \text{e}^{-} \rightarrow \text{H}_{2} \text{O}, \)
\( \text{E}_{\text{O}_{2} / \text{H}_{2} \text{O}}^{\circ}=+1.223 \text{ V}\)
Will the permanganate ion, \(\text{MnO}_{4}^{-}\) , liberate \(\text{O}_{2}\) from water in the presence of an acid?
1. No, because \(\text{E}_{\text {cell }}^{\circ}=-2.733 \text{ V}\)
2. Yes, because \(\text{E}_{\text {cell }}^{\circ}=+0.287 \text{ V}\)
3. No, because \(\text{E}_{\text {cell }}^{\circ}=-0.287 \text{ V}\)
4. Yes, because \(\text{E}_{\text {cell }}^{\circ}=+2.733 \text{ V}\)
20. Given below are two statements:
| Statement I: |
Primary aliphatic amines react with HNO2 to give unstable diazonium salts. |
| Statement II |
Primary aromatic amines react with HNO2 to form diazonium salts which are stable even above 300 K. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. |
Statement I is incorrect but Statement II is correct |
| 2. |
Both Statement I and II are correct |
| 3. |
Both Statement I and II are incorrect |
| 4. |
Statement I is correct but Statement II is incorrect |
21. What fraction of Fe exists as Fe(III) in Fe0.96O?
(Consider Fe0.96 to be made up of Fe(II) and Fe(III) only)
1. \(\dfrac{1}{12}\)
2. \(0.08\)
3. \(\dfrac{1}{16}\)
4. \(\dfrac{1}{20}\)
22. When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
23. Against the codon 5' UAC 3', what would be the sequence of anticodon on tRNA ?
1. 5' AUG 3'
2. 5' ATG 3'
3. 5' GTA 3'
4. 5' GUA 3
24. Given below are two statements:
| Statement I: |
In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles. |
| Statement II: |
Particulate matter (PM 2.5) cannot be removed by scrubber but can be removed by an electrostatic precipitator. |
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
25. DNA replication is semi-conservative in nature. This was experimentally proved in eukaryotes by:
1. Hershey and Chase
2. Macleod and McCarty
3. Meselson and Stahl
4. Talyor and his colleagues
26. What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?
| 1. |
To protect the vascular tissue from high light intensity. |
| 2. |
To provide the site for photorespiratory pathway. |
| 3. |
To increase the number of chloroplast for the operation of Calvin cycle. |
| 4. |
To enable the plant to tolerate high temperature. |
27. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
| Assertion (A): |
Spirulina is a microbe that can be used for reducing environmental pollution. |
| Reason (R): |
Spirulina is a rich source of protein, carbohydrates, fats, minerals and vitamins. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. |
Both (A) and (R) are correct and (R) is the correct explanation of (A). |
| 2. |
Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
| 3. |
(A) is correct but (R) is not correct. |
| 4. |
(A) is not correct but (R) is correct. |
28. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)
| Assertion (A): |
Semiconservative replication was experimentally proved by Mathew Meselson and Franklin Stahl (1958) |
| Reason (R): |
Meselson and Stahl used radioactive isotope \(^{15}N\) and equilibrium density gradient centrifugation technique. |
In the light of the above statements, choose the correct answer from the options given below:
| 1. |
(A) is True but (R) is False. |
| 2. |
(A) is False but (R) is True. |
| 3. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
29. In an E.coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome ?
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated
30. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): |
FSH which interacts with membrane bound receptors does not enter the target cell. |
| Reason (R): |
Binding of FSH to its receptors generates second messenger (cyclic AMP) for its biochemical and physiological responses. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. |
(A) is True but (R) is False. |
| 4. |
(A) is False but (R) is True. |
31. Statements related to human Insulin are given below.
Which statement(s) is/are correct about genetically engineered Insulin?
| (a) |
Pro-hormone insulin contain extra stretch of C-peptide |
| (b) |
A-peptide and B-peptide chains of insulin were produced separately in E.coli, extracted and combined by creating disulphide bond between them. |
| (c) |
Insulin used for treating Diabetes was extracted from Cattles and Pigs. |
| (d) |
Pro-hormone Insulin needs to be processed for converting into a mature and functional hormone. |
| (e) |
Some patients develop allergic reactions to the foreign insulin. |
Choose the most appropriate answer from the options given below:
1.
(c),
(d) and
(e) only
2.
(a),
(b) and
(d) only
3.
(b) only
4.
(c) and
(d) only
32. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) .
| Assertion (A): |
With the help of several ommatidia, a cockroach can perceive several images of an object, i.e., mosaic vision. |
| Reason (R): |
Mosaic vision gives more sensitivity but less resolution. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. |
(A) is True but (R) is False. |
| 2. |
(A) is False but (R) is True. |
| 3. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
33. Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis?
| (a) |
It results in the formation of haploid gametes. |
| (b) |
Differentiation of gamete occurs after the completion of meiosis. |
| (c) |
Meiosis occurs continuously in a mitotically dividing stem cell population. |
| (d) |
It is controlled by the Luteinising hormone (LH) and Follicle Stimulating Hormone (FSH) secreted by the anterior pituitary. |
| (e) |
It is initiated at puberty. |
Choose the most appropriate answer from the option given below:
| 1. (b), (c), and (e) only |
2. (c) and (e) only |
| 3. (b) and (c) only |
4. (b), (d) and (e) only |
34. Given below are two statements:
| Statement I: |
The release of sperms into the seminiferous tubules is called spermiation. |
| Statement II: |
Spermiogenesis is the process of formation of sperms from spermatogonia. |
In the light of the above statements, choose the most appropriate answer from the option given below :
1.
Statement I is incorrect but
Statement II is correct.
2. Both
Statement I and
Statement II are correct.
3. Both
Statement I and
Statement II are incorrect.
4.
Statement I is correct but
Statement II is incorrect.
35. An intestinal hormone that stimulates the pancreas to release a watery secretion that is rich in bicarbonate ions is:
1. Cholecystokinin
2. Gastric Inhibitory Peptide
3. Enterokinin
4. Secretin
36. Which one of the following statements is correct?
| 1. |
Increased ventricular pressure causes closing of the semilunar valves. |
| 2. |
The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction. |
| 3. |
The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria. |
| 4. |
Blood moves freely from atrium to the ventricle during joint diastole. |
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36 Most Difficult MCQs from 3 Papers of NEET 2022Contact Number: 8527521718
