Recently Active Disucss Test Question Questions

The pH of 0.1 M NH4OH (Kb=1.8*105 is ...

Which of the following is a "superacid" ...

A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 volts. The potential at the centre of the sphere is ...

Two identical thin rings, each of radius R metres, are coaxially placed a distance R metres apart. If Q1 and Q2 are the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of one ring ...

A charge +q is fixed at each of the points x=x0, x=3x0, x=5x0 ......∞ on the x-axis and a charge -q is fixed at each points x=2x0, x=4x0, x=6x0, ........ Here x0 is a positive quantity. The potential ...

A non conducting ring of radius 0.5 m carries a total charge of 1.11×10-10 C is distributed non-uniformly on its circumference producing an electric field everywhere in space. The value of the integral l=∞∫l=0-E. ...

The electric potential V at any point x,y,z (all in metres) in space is given by V=4x2 volts. The electric field at the point (1,0,2) is ...

Four point charges, each of value +q C, are placed on four vertices of a regular pentagon whose vertices are at distance L from the centre. The force on the point charge of value -q C placed at the centre of the pentagon is( ...

An electron of mass me, initially at rest, moves through a certain distance in a uniform electric field in time t1. A proton of mass mp, also initially at rest, takes time t2 to move through an equal distance in this uniform ...

Six charges of equal magnitude, 3 positive and 3 negative are to be placed on PQRSTU corners of a regular hexagon, such that field at the centre is double that of what it would have been if only one +ve charge is placed at R ...

A charge q is placed at the centre of line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to ...

Two small ball having equal positive charges Q on each are suspended by two insulating strings of equal length L from a hook fixed to a stand. The whole setup is taken in a satellite into space where there is no gravity. The ...

Five point charges, each of value +q C, are placed on five vertices of a regular hexagon of side L m. The magnitude of the force on the point charge of value -q C placed at the centre of the hexagon is ...

A solid body X of heat capacity C is kept in an atmosphere whose temperature is 300K. At t=0 temperature of X is 400K. It cools according to Newton's Law of cooling.At time t1 its temperature is found to be 350 K .At ...

Hot oil is circulated through an insulated container with a wooden lid at the top whose conductivity K=0.149 J/m/°C thickness t=5mm, emissivity=0.6. Temperature of the top of the lid is maintained at Tl=127° ...

Three discs A, B and C having radii 2,4 and 6 cm respectively are coated with carbon black. Wavelength for maximum intensity for the three discs are 300, 400 and 500 nm respectively. If QA, QB, QC are power emitted by A, B an ...

The temperature (T) versus time (t) graph of two bodies X and Y with equal surface areas are shown in the figure. If the emissivity and the absorptivity of X and Y are EX, EY and AX and AY respectively, then *Image* ...

An ideal black body at room temperature is thrown into a furnace. It is observed that ...

A wall has two layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity of the material of A is twice that of B. Under thermal equilibrium, the temperature difference ...

Three rods of identical cross-sectional area and made from the sides of an isosceles triangle ABC, right-angled at B. The point A and B are maintained at temperatures T and √2T respectively. In the steady state, the tempera ...

Two identical rods are connected between two containers, one of them is at 100°C and another at 0°C. If two identical rods are connected in parallel then the rate of melting of ice is q1 gm/sec. If they are connected in ser ...

Three rods made of same material and having the same cross-section have been joined as shown in the figure. Each rod is of same length. The left and right ends are kept at 0°C and 90°C respectively. The temperature of the j ...

A cylinder of radius R made of a material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined syste ...

Two moles of an ideal monoatomic gas, initially at pressure P1 and volume V1 undergo an adiabatic compression until its volume is V2. Then the gas is given heat Q at constant volume V2, total change in internal energy is ...

A monoatomic ideal gas of two moles is taken through a cyclic process for A as shown in figure. The volume ratios are (VB/VA)=2 and (VD/VA)=4. If the temperature TA at A is 27°C, then the total work done by the gas d ...

An ideal gas is taken through the cycle ABCA, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process in the process CA is (the values given are in SI units) *I ...

When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is ...

An ideal gas is taken through a cyclic thermodynamic process through four steps. The amounts of heat involved in these steps are Q1=5960 J, Q2=-5585 J, Q3=-2980 J and Q4 respectively. The corresponding works invol ...

An ideal gas undergoes cyclic process as shown in the given P-T diagram, where AC is adiabatic. The process is also represented by *Image* ...

P-V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should correspond respectively to *Image* ...