List of practice Questions

A square surface of side L m is in the plane of the paper. A uniform electric field \(\rightarrow\) E \(\bigg(\frac{V}{m}\bigg)\), also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity \(\omega\). The force exerted by the liquid at the other end is :

A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is : (Moment of inertia of rod about A is \(\bigg(\frac{ml^2}{3}\bigg)\)

The velocity v of a particle at time t is given by v = at + \(\bigg(\frac{b}{t}+c\bigg)\), where a, b and c are constants, The dimensions of a, b and c are respectively : constants, The dimensions of a, b and c are respectively :

The momentum of a photon of energy 1 MeV in kg m/s, will be :

The earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the earth. The escape velocity of a body from this platform is fve, where ve is its escape velocity from the surface of the earth. The value of f is :

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A ?

Which one of the following statements is true ?

Above Curie temperature :

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is :

During osmosis, flow of water through a semi-permeable membrane is :

Photochemical smog pollution does not contain:

The enthalpy and entropy change for the reaction : Br₂(l) + Cl₂(g) → 2BrCl(g) are 30 kJ mol^-1 and 105 JK^-1 mol^-1 respectively. The temperature at which the reaction will be in equilibrium is :

The general molecular formula, which represents the homologous series of alkanols is :

A hypothetical electrochemical cell is shown below 
\(A|A+ (xM)|| B+ (yM)| B \)
The emf measured is +0.20 V. The cell reaction is:

1.00 g of a non-electrolyte solute (molar mass 250 g mol^-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K kg mol^-1, the freezing point of benzene will be lowered by:

[Cr(H₂O)₆]Cl₃ (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields:

The enthalpy of combustion of H₂, cyclohexene (C₆H₁₀) and cyclohexene (C₆H₁₂) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

The major organic product in the reaction, CH₃ – O – CH(CH₃)₂ + HI \(→\) Product is:

Assume each reaction is carried out in an open container. For which reaction will ∆H = ∆E?

More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is:

In which of the following pairs are both the ions coloured in aqueous solution? (Atomic number: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

If E°_Fe²⁺/Fe = -0.441 V and E°_{Fe³⁺/Fe²⁺} = 0.771 V, the standard emf of the reaction: Fe + 2Fe³⁺ \(→\) 3Fe²⁺ will be:

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is: