List of top Questions asked in NEET (UG)

Which of the following statements about primary amines is false ?

A tuning fork of frequency $512\, Hz$ makes $4$ beats per second with the vibrating string of a piano. The beat frequency decreases to $2$ beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

A ray of light travelling in a transparent medium of refractive index $ \mu $, falls on a surface separating the medium from air at an angle of incidence of 45$^{\circ}$. For which of the following value of $ \mu $. the ray can undergo total internal reflection?

A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat $Q$ in time $t$. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod when placed in thermal contact with the two reservoirs in time $t$ ?

A galvanometer has a coil of resistance $100\, ohm$ and gives a full scale deflection for $30\, mA$ current. If it is to work as a voltmeter of $30\, volt$ range, the resistance required to be added will be

A particle of mass $M$, starting from rest, undergoes uniform acceleration. If the speed acquired in time $T$ is $V$, the power delivered to the particle is

A condenser of capacity $C$ is charged to a potential difference of $V_1$. The plates of the condenser are then connected to an ideal inductor of inductance $L$. The current through the inductor when the potential difference across the condenser reduces to $V_2$ is

A current loop consists of two identical semicircular parts each of radius $R$, one lying in the $x-y$ plane and the other in $x-z$ plane. If the current in the loop is $i$. The resultant magnetic field due to the two semicircular parts at their common centre is

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

A $0.66\, kg$ ball is moving with a speed of $100 \,m/s$. The associated wavelength will be $(h = 6.6 \times 10^{-34} \, Js)$

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

Consider the following relations for emf of a electrochemical cell : (a) emf of cell = (Oxidation potential of anode) - (Reduction potential of cathode) (b) emf of cell = (Oxidation potential of anode) + (Reduction potential of cathod) (c) emf of cell = (Reduction potential of anode) + (Reduction potential of cathode) (d) emf of cell = (Oxidation potential of anode) - (Oxidation potential of cathode) Which of the above relations are correct ?

A circular disk of moment of inertia it is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed $\omega_i$. Another disk of moment of inertia $I_b$ is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed $\omega_f$. The energy lost by the initially rotating disc to friction is

Vasa eflferentia are the ductules leading from

Which one of the following is employed as a tranquilizer drug ?

A solution of sucrose (molar mass = $342 \,g \,mol^{-1}$) has been prepared by dissolving $68.5 \,g$ of sucrose in $1000 \,g$ of water. The freezing point of the solution obtained will be ($K_f$ for water = $1.86 \, K \, kg \, mol^{-1}$)

Which of the following does not exihibit the phenomena of mutarotation?

Some of the properties of the two species, $NO_3^-$ and ${H_3O^+}$ are described below. Which one of them is correct?

The rate of the reaction $ {2NO + Cl_2 -> 2NOCl}$ is given by the rate equation rate = $ { k[NO]^2[Cl_2]}$ . The value of the rate constant can be increased by -

In a buffer solution containing equal concentration of $ B^- $ and HB, the $ K_b $ for $ B^- $ is $ 10^{-10} $ . The pH of buffer solution is

What is $ [H^+] $ in mol/L of a solution that is $0.20 \,M$ in $ CH_3COONa $ and $0.10 \,M$ in $ CH_3COOH $ ? $ (K_a\, \, for\, \, CH_3COOH = 1.8 \times 10^{-5}) $

Infectious proteins are present in

Which one of the following species does not exist under normal conditions?

In human female the blastocyst