Archives

The number of chlorine atoms in 20 mL of chlorine gas at STP is ………10²¹.

The number of chlorine atoms in 20 mL of chlorine gas at STP is ………1021. (Round off to the Nearest Integer). [Assume... View Article

A 1 molal K₄Fe(CN)₆ solution has a degree of dissociation of 0.4.

A 1 molal K4Fe(CN)6 solution has a degree of dissociation of 0.4. Its boiling point is equal to that of another solution which contains 18.1... View Article

A KCl solution of conductivity 0.14 S m^-1 shows a resistance of 4.19 Ω in a conductivity cell.

A KCl solution of conductivity 0.14 S m-1 shows a resistance of 4.19 Ω in a conductivity cell. If the same cell is filled with an HCl solution,... View Article

Consider the reaction N₂O₄ (g) ⇌ 2NO₂ (g).

Consider the reaction N2O4 (g) ⇌ 2NO2 (g). The temperature at which KC = 20.4 and KP = 600.1, is... View Article

On complete reaction of FeCl₃ with oxalic acid in an aqueous solution containing KOH, resulted in the formation of product A.

On complete reaction of FeCl3 with oxalic acid in an aqueous solution containing KOH, resulted in the formation of product A. The secondary... View Article

Consider the below-given reaction. The percentage yield of an amide product is

Consider the below-given reaction. The percentage yield of an amide product is ………………. (Round off to... View Article

In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ……………..x 10^-1 BM.

In the ground state of atomic Fe (Z = 26), the spin-only magnetic moment is ……………..x 10-1 BM. (Round off to... View Article

The reaction 2A + B₂→ 2AB is an elementary reaction.

The reaction 2A + B2→ 2AB is an elementary reaction. For a certain quantity of reactants, if the volume of the reaction vessel is reduced by... View Article

A 750 Hz, 20 V (rms) source is connected to a resistance of 100 Ω, an inductance of 0.1803 H and a capacitance of 10 μ F all in series. The time in which the resistance (heat capacity 2 J/°C) will get heated by 10°C. (assume no loss of heat to the surroundings) is close to

1) 245 s2) 365 s3) 418 s4) 348 sSolution:Answer. 4f = 750Hz,Vrms = 20V,R = 100 Ω,L = 0.1803HC = 10 μ fS = 2J / C P×t = S∆θt=2(10)/0.0575t = 348 sec... View Article

In a Young’s double slit experiment, light of 500 nm is used to produce an interference pattern. When the distance between the slits is 0.05 mm, the angular width (in degree) of the fringes formed on the distance screen is close to

1) 0.17° 2) 0.07° 3) 0.57° 4) 1.7° Solution: Answer. 3 B = λD/d Θ = β/D = (λ/d) , , ,... View Article

Pressure inside two soap bubbles are 1.01 and 1.02 atmosphere, respectively. The ratio of their volumes is

1) 4 : 1 2) 2 : 1 3) 0.8 : 1 4) 8 : 1 Solution: Answer. 4 , , , , ,... View Article

A satellite is moving in a low nearly circular orbit around the earth. Its radius is roughly equal to that of the earth’s radius R_e…..

A satellite is moving in a low nearly circular orbit around the earth. Its radius is roughly equal to that of the earth’s radius Re. By firing... View Article

Moment of inertia of a cylinder of mass M, length L and radius R about an axis

Moment of inertia of a cylinder of mass M, length L and radius R about an axis passing through its centre and perpendicular to the axis of the... View Article

In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is:

1) 3/42) 7/83) 4/54) 3/5Solution:Answer. 1N= N0 e-λt After t/2 timeN/ N0= N0 e-λt/2N/ N0= (9/16) 1/2 = 3/4... View Article

Two isolated conducting spheres S₁ and S₂ of radius (2/3) R and (1/3) R have 12 μC and –3μC charges, respectively, and are at a large distance from each other. They are now connected by a conducting wire. A long time after this is done the charges on S₁ and S₂ are respectively:

1) 6 μC and 3 μC2) 4.5 μC on both3) + 4.5 μC and –4.5 μC4) 3 μC and 6 μCSolution:Answer. 1 q1+q2 = 9 μC------------------(1) q1= 2q23 q2 =9... View Article

When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to:

1) 1.02 eV 2) 0.61 eV 3) 0.52 eV 4) 0.81 eV Solution: Answer. 2 , , , , ,... View Article

A balloon filled with helium (32° C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as:

1) reversible isothermal2) irreversible isothermal3) reversible adiabatic4) irreversible adiabaticSolution:Answer. 4irreversible adiabatic... View Article

An elliptical loop having resistance R, of semi major axis a, and semi minor axis b is placed in magnetic field as shown in the figure. If the loop is rotated about the x-axis with angular frequency ω, the average power loss in the loop due to Joule heating is

1) πabBω/R2) π2a2b2B2ω2/R3) π2a2b2B2ω2/2R4) ZeroSolution:Answer. 3Φ =BA cos ωtε =(dφ/dt)= BA ω sin ωt= Bπab ω sin ωtε0= Bπab ωP = ε2/R =... View Article

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid….

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by... View Article

Model a torch battery of length l to be made up of a thin cylindrical bar of radius ‘a’ and a concentric thin cylindrical shell of radius

Model a torch battery of length l to be made up of a thin cylindrical bar of radius ‘a’ and a concentric thin cylindrical shell of radius ‘b’... View Article