AIIMS Paramedical 2025 Question Paper Available- Download Here with Solution PDF

What is the correct unit for the rate constant in a first-order reaction?

• (A) Moles per litre per second
• (B) Per second
• (C) Litre per mole per second
• (D) Moles squared per litre squared per second

If the rate constant is measured in per second, which reaction order does this indicate?

• (A) Zero order
• (B) First order
• (C) Either zero or first order
• (D) None of these

Match each type of reduction to its reagent:

• (A) Clemmensen Reduction → Zinc amalgam with hydrochloric acid
• (B) Wolff-Kishner Reduction → Hydrazine and potassium hydroxide with heat
• (C) Rosenmund Reduction → Hydrogen gas with palladium on barium sulfate

For a proton and electron both with the same kinetic energy, what is the ratio of their de Broglie wavelengths?

• (A) 1:1
• (B) \( \frac{m_e}{m_p} \)
• (C) \( \sqrt{\frac{m_p}{m_e}} \)
• (D) \( \frac{m_e}{m_p} \)

What is the spin magnetic moment of Cr(III) in Bohr Magnetons?

• (A) 3.87 BM
• (B) 2.83 BM
• (C) 5.92 BM
• (D) 4.90 BM

Evaluate these statements about transition metals:

• (A) Both statements are right, and second explains the first
• (B) Both are accurate, but second does not explain the first
• (C) First is false, second is true
• (D) First is true, second is incorrect

Which statement correctly contrasts Clemmensen and Wolff-Kishner reductions?

• (A) Clemmensen uses base, Wolff-Kishner uses acid
• (B) Both are done under acidic conditions
• (C) Clemmensen is for compounds stable in acid and uses Zn-Hg/HCl; Wolff-Kishner is for those stable in base and uses hydrazine/KOH
• (D) Both only reduce carboxylic acids

What is the bond order for diatomic carbon according to molecular orbital theory?

• (A) 1
• (B) 2
• (C) 3
• (D) 4

Which compound’s common name is cumene?

• (A) Isopropylbenzene
• (B) Methylbenzene
• (C) Ethylbenzene
• (D) Propylbenzene

Choose the correct ascending order of ionization energy for Zn, Cu, Ag:

• (A) Ag < Cu < Zn
• (B) Zn < Cu < Ag
• (C) Cu < Zn < Ag
• (D) Zn < Ag < Cu

Rank elements Li, Be, B, C in increasing first ionization energy:

• (A) Li < B < C < Be
• (B) Li < C < B < Be
• (C) Be < C < B < Li
• (D) Li < Be < B < C

When phenol is treated with NaOH, CO_2 (heat), and then acidified, what results?

• (A) Benzoic acid
• (B) Salicylic acid
• (C) Benzene
• (D) Anisole

Highest oxidation numbers for chromium and manganese:

• (A) +6, +6
• (B) +6, +7
• (C) +7, +6
• (D) +5, +7

Oxidation numbers of oxygen in H_2O_2 and H_2O:

• (A) –1 and –2
• (B) –2 and –1
• (C) –2 and –2
• (D) 0 and –2

Which element releases electrons most easily (lowest ionization enthalpy)?

• (A) Zinc
• (B) Cadmium
• (C) Mercury
• (D) All equally likely

Which ligand is stronger based on the spectrochemical series?

• (A) Thiocyanate
• (B) Cyanide
• (C) Both equally strong
• (D) Neither is strong

Which metal reacts most with dilute acid to displace hydrogen?

• (A) Zinc
• (B) Copper
• (C) Silver
• (D) All react the same

If a compound has octahedral geometry, what is the central atom’s hybridization?

• (A) sp\(^2\)
• (B) dsp\(^2\)
• (C) sp\(^3\)d\(^2\)
• (D) sp\(^3\)d\(^3\)

Match each complex to its geometry:

Which acid is the strongest: HF, HCl, HBr, HI?

• (A) HF
• (B) HCl
• (C) HBr
• (D) HI

Which aniline derivative is a commonly used dental local anaesthetic?

• (A) Paracetamol
• (B) Sulfanilamide
• (C) Lidocaine
• (D) Aniline hydrochloride

Which of these separation technique pairs is correctly matched?

• (A) Ortho and para nitrophenol: fractional distillation
• (B) Crude oil/petroleum: steam distillation
• (C) Cereal and amla: simple distillation
• (D) Crude oil/petroleum: fractional distillation

Pick the reaction that shows the Gattermann-Koch process:

• (A) Benzene + methyl chloride → ethylbenzene (AlCl\(_3\) catalyst)
• (B) Benzene + CO + HCl → benzaldehyde (AlCl\(_3\), CuCl catalysts)
• (C) Benzene + bromine → bromobenzene (FeBr\(_3\) catalyst)
• (D) Benzene + acetyl chloride → acetophenone (AlCl\(_3\) catalyst)

What are the dimensional formula units for voltage?

What is the ratio of the de Broglie wavelengths for an electron and a proton if both have equal kinetic energy?

If current drops from 4 A to 0 A in 0.5 s, and voltage is 120 V, find the self-inductance.

Apply the mirror formula if focal length \( f = l \, m \) and object distance \( u = 15 \, m.\)

What is the Bohr radius of a hydrogen atom?

How can energy losses in a transformer be minimised?

Given \( E(t) = 108t - 22 \), how is velocity derived from the electric field?

For a microscope with objective \( f_o = 1 \, cm \), eyepiece \( f_e = 10 \, cm \), and image distance \( v = 25 \, cm \), find total magnification.

If light intensity is known, how is non-reflecting momentum calculated?

What is the magnetic field at the centre of a current-carrying loop?

Given \( n \) turns, current \( I \), permeability, and diameter, find magnetisation.

What is \( C_v \) for a monoatomic gas?

For \( V = 120 \, V \), find the resonant current \( I_0 \).

At \( T = 27^\circ C \), \( V_i = 0.4 \, L \), \( V_f = 0.8 \, L \), find isothermal work.

For mass 20 kg, torque \( \tau = 5 \, Nm \), find angular acceleration \( \alpha \).

Which technique did Mendel use while experimenting on pea plants?

• (a) Natural pollination
• (b) Hybridisation
• (c) Grafting
• (d) Emasculation

What is the term for the beginning of the menstrual cycle?

Who first classified the plant kingdom?

• (a) Carlous Linnaeus
• (b) R.H. Whittaker
• (c) Bentham & Hooker

Platelets are formed at which site?

Adaptive radiation is an example of which type of evolution?

Select the incorrect statement:

• (a) In geitonogamy, pollination occurs in different flowers.
• (b) In Vallisneria, pollination takes place with the help of water.
• (c) Autogamy involves pollination within the same flower.

Match the following pairs:

Filariasis is caused by?

Name the repressor of the lac operon.

When xylem is present at the same radius in a stem or root, what is this arrangement called?

• (a) Radial
• (b) Conjoint
• (c) Open
• (d) Close