List of practice Questions

The radius of hydrogen atom in the ground state is 0.53 $\mathring{A}.$ The radius of $Li^{2+}$ ion (at. no. = 3) in a similar state is
Which of the following is a redox reaction ?
The position vector of a particle is $ \overrightarrow{r} = (a \, \cos \, \omega t) \widehat{i} + (a \sin \omega t) \widehat{j}$. The velocity of the particle is
The phenomenon in which an allele of one gene supresses the activity of an allele of another gene is known as
A reaction occurs spontaneously if :
If a beam of light is passed through true solution, it is
Which of the following organisms possesses characteristics of a plant and an animal?
The function of contractile vacuole, in protozoa, is
Which of the following is the anhydride of sulphuric acid?
About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
Which of the following protein destroy the antigen when it enters in body cell?
The citric acid is produced by
500 mL of nitrogen at $27^\circ C$ is cooled to $-5^\circ C$ at the same pressure. The new volume becomes

The oxide which cannot act as a reducing agent is

Besides annelida and arthropoda, the metamerism is exhibited by
The $\alpha$-D-glucose and $\beta$-D-glucose differ from each other due to difference in carbon atom with respect to its
Phenol, p-Methylphenol, m-Nitrophenol and p-Nitrophenol follows order of increasing acidic strength
Barr body in mammals represents
In an A.C. circuit, the current flowing is \(I=5sin(100 t - \frac{π}{2}) ampere\) and the potential difference is \(V = 200 sin (100 t) volts\). The power consumption is equal to
Percentage error in the measurement of mass and speed are $2\%$ and $3\%$ respectively. The error in the estimation of kinetic energy obtained by measuring mass and speed will be
Two wires of the same metal have same length, but their cross-sections are in the ratio 3 : 1. They are joined in series. The resistance of thicker wire is $10\, \Omega.$ The total resistance of the combination will be
When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true?
Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% $CaCl_2$ because
Uncertainty in position of an electron (mass of an electron is =$9.1\times10^{-28}g)$ moving with a velocity of $3 \times 10 ^4$ cm/s accurate upto 0.001% will be (use $\frac{h}{4\pi}$ in uncertainty expression where $h = 6.626 \times 10^{-27}$ erg s)
The dimensions of $RC$ is