List of practice Questions

Gibberellic acid induces flowering:

In Young's double slit experiment, fringe width decreases by 25% when apparatus is immersed in a liquid. Refractive index of the liquid is

When interference is observed, energy is

In an interference experiment, distance between the slits is 2 mm and screen is placed at distance 1 m from the slits. Fourth dark fringe is formed exactly opposite to one of the slits. Wavelength of light used in nm is

Radish is a modified root and an example of:

If work function of a metal is $4.2\,eV$, the cut off wavelength is:

The pressure exerted by an electromagnetic wave of intensity $I\left( W / m ^{2}\right)$ on a non-reflecting surface is: $[c$ is the velocity of light $]$

Two light rays having the same wavelength $\lambda$ in vacuum are in phase initially. Then the first ray travels a path $L_1$ through a medium of refractive index $n_1$ while the second ray travels a path of length $L_2$ through a medium of refractive index $n_2$. The two waves are then combined to produce interference. The phase difference between the two waves is

Turning effect is produced by

A block of mass 2 kg rests on a plane inclined at an angle of $ {{30}^{o}} $ with the horizontal. The coefficient of friction between the block and surface is 0.7. The frictional force acting on the block is:

Water of volume 2 L in a container is heated with a coil of 1 kW at 27$^{\circ}$C. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27$^{\circ}$C to 77$^{\circ}$C? [Specific heat of water is 4.2 kJ/kg]

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is of the ratio of their focal length is $\frac{3}{2}$ Their equivalent focal length is 30 cm. What are their individual focal lengths ?

The exposure time of a camera lens at $ f/2.8 $ setting is $1/200$ s. The correct exposure time at $ f/5.6 $ setting is:

Reflex action is controlled by

Haemodialysis helps in patient having:

'Heart of heart' is:

Hydrogen bomb is based on the principle of :

Amia belongs to family

Transfusion tissue is found in:

The material used in warfare in making smoke screens for military purposes is:

Glucose has difference from fructose in that it

The X-ray cannot be diffracted by means of an ordinary grating due to

There are $26$ tuning forks arranged in the decreasing order of their frequencies. Each tuning fork gives $3$ beats with the next. The first one is octave of the last. What is the frequency of $18th$ tuning fork?