NEET 2017 PITA
For the following questions answer them individually
A parallel beam of light of wavelength $$\lambda$$ is incident normally on a single slit of width d. Diffraction bands are obtained on a screen placed at a distance D from the slit. The second dark band from the central bright band will be at a distance given by :
A thin uniform rod of mass ‘M’ and length ‘L’ is rotating about a perpendicular axis passing through its centre with a constant angular velocity $$'\omega'$$. of mass $$\frac{M}{3}$$ are attached gently to the two ends of the rod. The rod will now rotate with an angular velocity of :
Two open organ pipes of fundamental frequencies $$n_1$$ and $$n_2$$ are joined in series. The fundamental frequecny of the new pipe so obtained will be :
The density of a metal at normal pressure is $$\rho$$. Its density when it is subjected to an excess pressure p is $$\rho'$$ If B is Bulk modulus of the metal, the ratio of $$\frac{\rho'}{\rho}$$ is
If the mass of neutron is $$1.7 \times 10^{-27}$$ kg, then the de-Broglie wavelength of neutron of energy 3eV is : $$(h = 6.6 \times 10^{34} JS)$$
Imagine earth to be a solid sphere of mass M and radius R. If the value of acceleration due to gravity at a depth ‘d’ below earth’s surface is same as its value at a height ‘h’ above its surface and equal to $$\frac{g}{4}$$ (where g is the value of acceleration due to gravity on the surface of earth), the ratio of $$\frac{h}{d}$$ will be:
In a certain planetary system, it is observed that one of the celestial bodies having a surface temperature of 200K, emits radiation of maximum intensity near the wavelength 12 $$\mu$$m. The surface temperature of a nearby star which emits light of maximum intensity at a wavelength $$\lambda = 4800 A$$, is:
One mole of a gas obeying the equation of state P(V-b) = RT is made to expand from a state with coordinates $$(P_1, V_1)$$ to a state with $$(P_2, V_2)$$ along a process that is depicted by a straight line on a P-V diagram. Then, the work done is given by
A metal block of base area 0.2m$$^2$$ is connected to a 0.02 kg mass via a string that passes over an ideal pulley as shown in figure. A liquid film of thickness 0.6 mm is placed between the block and the table. When released the block moves to the right with a constant speed of 0.17 m/s. The co-efficient of viscosity of the liquid is :
