NEET: 10 sample questions

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Q1

Nitrogen-fixing bacteria convert:

A.N₂ → NH₃

B.NH₄⁺ → nitrates

C.NO₂ → NO₃

D.NO₃ → N₂
Q2

The surface area of a sphere is A = 4πr². If the radius r has a percentage error of 0.3%, what is the percentage error in the surface area A?

A.0.15%

B.0.30%

C.0.60%

D.1.20%
Q3

Assertion : Senescence is the time when age associated defects are manifested. Reason : Certain genes may be undergoing sequential switching on and off during one's life.

A.If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.

B.If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

C.If Assertion is correct but Reason is incorrect.

D.If both the Assertion and Reason are incorrect.
Q4

Which one is classified as a condensation polymer?

A.Dacron

B.Neoprene

C.Teflon

D.Acrylonitrile
Q5

A monochromatic light beam of frequency 1.00 × 10^15 Hz is incident on a metal surface having work function 2.14 eV. If h = 4.14 × 10^-15 eV s, h = 6.63 × 10^-34 J s, m_e = 9.1 × 10^-31 kg and 1 eV = 1.6 × 10^-19 J, the stopping potential and the de Broglie wavelength of the fastest photoelectrons are, respectively:

A.2.00 V and 0.87 nm

B.4.14 V and 0.87 nm

C.2.00 V and 0.60 nm

D.2.14 V and 0.84 nm
Q6

A 2 kg wooden block rests on a soft horizontal floor. A 25 kg iron cylinder is placed on the block, and the combined system accelerates vertically downward at 0.1 m/s² when the floor yields. Taking g = 10 m/s², the force exerted by the combined system on the floor is:

A.267.3 N vertically downward

B.270 N vertically downward

C.2.7 N vertically downward

D.272.7 N vertically downward
Q7

A satellite of mass 400 kg is shifted from a circular orbit of radius 2R_E to another circular orbit of radius 4R_E around the Earth. If g = 9.8 m s^-2 and R_E = 6.4 × 10^6 m, which of the following gives the energy supplied, change in kinetic energy (ΔK), and change in potential energy (ΔU), respectively?

A.3.14 × 10^9 J, −3.14 × 10^9 J, +6.27 × 10^9 J

B.6.27 × 10^9 J, −3.14 × 10^9 J, +3.14 × 10^9 J

C.3.14 × 10^9 J, +3.14 × 10^9 J, +6.27 × 10^9 J

D.3.14 × 10^9 J, −6.27 × 10^9 J, +6.27 × 10^9 J
Q8

Consider the four complexes [Ni(CN)4]2−, [NiCl4]2−, [CoF6]3− and [Co(CN)6]3−. Using CN− as a strong-field ligand and F−/Cl− as weak-field ligands, which option correctly gives, for each complex in the stated order: oxidation state and d-electron count of the metal; geometry and hybridisation; number of unpaired electrons; and spin-only magnetic moment?

A.[Ni(CN)4]2−: Ni(II), d8, square planar dsp2, 0 unpaired, 0 BM; [NiCl4]2−: Ni(II), d8, tetrahedral sp3, 2 unpaired, √8 BM; [CoF6]3−: Co(III), d6, octahedral sp3d2, 4 unpaired, √24 BM; [Co(CN)6]3−: Co(III), d6, octahedral d2sp3, 0 unpaired, 0 BM

B.[Ni(CN)4]2−: Ni(II), d8, square planar dsp2, 0 unpaired, 0 BM; [NiCl4]2−: Ni(II), d8, tetrahedral sp3, 2 unpaired, √8 BM; [CoF6]3−: Co(III), d6, octahedral d2sp3, 0 unpaired, 0 BM; [Co(CN)6]3−: Co(III), d6, octahedral sp3d2, 4 unpaired, √24 BM

C.[Ni(CN)4]2−: Ni(II), d8, tetrahedral sp3, 2 unpaired, √8 BM; [NiCl4]2−: Ni(II), d8, square planar dsp2, 0 unpaired, 0 BM; [CoF6]3−: Co(III), d6, octahedral sp3d2, 4 unpaired, √24 BM; [Co(CN)6]3−: Co(III), d6, octahedral d2sp3, 0 unpaired, 0 BM

D.[Ni(CN)4]2−: Ni(II), d8, square planar dsp2, 0 unpaired, 0 BM; [NiCl4]2−: Ni(II), d8, tetrahedral sp3, 2 unpaired, √8 BM; [CoF6]3−: Co(III), d6, octahedral sp3d2, 2 unpaired, √8 BM; [Co(CN)6]3−: Co(III), d6, octahedral d2sp3, 0 unpaired, 0 BM
Q9

Two point charges +10 μC and −10 μC are placed 5.0 mm apart in vacuum. Let P be a point on the dipole axis, 15 cm from the centre on the side of the positive charge, and Q a point on the perpendicular bisector, also 15 cm from the centre. Taking k = 9.0 × 10^9 N m² C^−2, which option gives the approximate magnitudes and directions of the electric fields at P and Q? The dipole moment is directed from the negative to the positive charge.

A.At P: 2.67 × 10^5 N C^−1 along the dipole moment; at Q: 1.33 × 10^5 N C^−1 opposite to the dipole moment

B.At P: 2.67 × 10^5 N C^−1 opposite to the dipole moment; at Q: 1.33 × 10^5 N C^−1 along the dipole moment

C.At P: 2.60 × 10^5 N C^−1 along the dipole moment; at Q: 1.30 × 10^5 N C^−1 opposite to the dipole moment

D.At P: 1.33 × 10^5 N C^−1 along the dipole moment; at Q: 2.67 × 10^5 N C^−1 opposite to the dipole moment
Q10

A hydrogen atom in its ground state absorbs a photon and is excited to the n = 3 level. It then undergoes a direct transition from n = 3 to n = 2, emitting another photon. Using E_n = −13.6/n² eV and hc = 1240 eV nm, the energy of the absorbed photon and the wavelength of the emitted photon are, respectively:

A.12.09 eV and 656 nm

B.12.09 eV and 366 nm

C.10.20 eV and 656 nm

D.1.51 eV and 821 nm

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