List of practice Questions

The layer of cells that secrete enamel of tooth is

The correct sequence in the process of development of human embryo is

The position of both an electron and helium atom is known within $1.0 nm$. The momentum of the electron is known within $5.0 \times 10^{-26} kg ms ^{-1}$. The minimum uncertainty in the measurement of the momentum of the helium atom is

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to

An aqueous solution of sodium carbonate absorbs NO and $NO_2$ to give

Plants such as Prosopis, Acacia and Capparis represent examples of tropical

Which of the following is the contractile protein of a muscle?

Microtubule is involved in the

Phenol gives_______colour with neutral \(FeCl_3\) solution

What is the major cause of diminishing wildlife number?

The vapour pressure of a solvent decreased by 10 mm o f mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm o f mercury?

IUPAC name of $\left[ Pt \left( NH _{3}\right)_{3}( Br )\left( NO _{2}\right) Cl \right] Cl$ is

The velocity of an electron in the innermost orbit of an atom is :

A heavy ball is thrown on a rough horizontal surface in such a way that it slides with a speed ($v_o$) initially without rolling. It will roll without sliding when its speed falls to:

When 2 equal resistances are connected in parallel to the poles of a cell of negligible internal resistance, the power developed is P. When the same resistances are connected in series across the same cell, the power developed is

Acetic acid reacts with $PCl_5$ to form

A transverse wave is represented by the equation $y=y_0 \sin\frac{2\pi}{\lambda}(vt-x)$ For what value of $\lambda$, is the maximum particle velocity equal to two times the wave velocity?

Which of the following has highest first ionization potential ?

Susceptibility of a magnetic substance is found to depend on temperature and the strength of the magnetising field. The material is a

An n-digit number is a positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2,5 and 7. The smallest value of n for which this is possible, is

Restriction endonucleases

The angular velocity of a body changes, from $ {{\omega }_{1}} $ to $ {{\omega }_{2}} $ without applying torque but by changing moment of inertia. The ratio of initial radius of gyration to the final radius of gyration is :

Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute hydrochloric acid. The compound so formed is converted into a tetrafluoroborate which is subsequently heated. The final product is

Aspirin is an acetylation product of

Human immuno deficiency virus (HIV) has a protein coat and a genetic material which is