List of practice Questions

When we migrate from dark to light, we fail to see for sometimes but after a time visibility becomes normal. It is example of

Which one correctly matched

Sp. vol. of cylinderical virus particle is 6.02 × 10^-2 cc/gm. Whose radius and length are 7 Å & 10Å respectively. If NA = 6.02 × 10^23. Find mol. wt. of virus

Which of following give positive Fehling solution test

Optical fibre are based on

If |A →+ B→| = |A→|= |B→| then angle between A and B will be

A ray of light travelling in air haves wavelength λ, frequency n, velocity v and intensity I. If this ray enters into water then these parameter are λ', n' , v' and I' respectively. Which relation is correct

A disc is placed on a surface of pond which has refractive index 5/3.A source of light is placed 4 m below the surface of liquid. The minimum radius of disc will be so light is not coming out

The total energy of particle performing SHM depend on

If $\overrightarrow{a}, \overrightarrow{b}$ and $ \overrightarrow{c}$ are unit vectors, then $|\overrightarrow{a}-\overrightarrow{b} |^2+| \overrightarrow{b}-\overrightarrow{c}|^2+| \overrightarrow{c}-\overrightarrow{a}|^2$ does not exceed

Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be

If $f (x) = xe^{x(1-x)}$ , then f (x) is

The value of $\int^{\pi}_{-\pi} \frac{ \cos^2 \, x }{ 1 + a^x } \, dx , a> 0 $ is

Which of the following species are restricted to a given area?

When the temperature of reactions will increase then the effect on $pH$ value will

In which of the following $p \pi$ - $d \pi$ bonding is possible?

A battery of emf 10V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by :

A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $\Delta T$ in a time $t$. A number $N$ of similar cells is now connected in series with a wire of the same material and cross-section but of length $4\,L$. The temperature of the wire is raised by the same amount $\Delta T$ in the same time. The value of $N$ is

In the given circuit, it is observed that the current I is independent of the value of the resistance $R_6$. Then, the resistance values must satisfy

Electric appliances with metallic body e.g., heaters, presses etc., have three pin connections, whereas an electric bulb has a two pin connection. Three pin connections reduce heating of connecting cables.

Which salt shows maximum osmotic pressure in its 1 M solution?

A particle executes simple harmonic motion between x = - A and x = + A. The time taken for it to go fromO to A /2 is $T_1$ and to go from $ A/2 \, \, to \, \, A \, is \, T_2, $ then

The rate of a first order reaction is $ 0.693\times {{10}^{-2}}\,mol\,{{L}^{-1}}\,{{\min }^{-1}} $ and the initial concentration of the reactants is 1 M, $ {{t}_{1/2}} $ is equal to:

If I is the intensity of absorbed light and C is the concentration of AB for the photochemical process.$AB + hv\rightarrow$ AB, for the rate of formation of AB is directly proportional to