Test Preparation on JEE Mains Modren Physics Paper (I)-2018

The diameter of a plano-convex lens is 6 cm and the thickness at
the center is 3 mm. If the speed of light in the material of the lens is 2 ×
108 m/s, the focal length of the lens is-

A beam of unpolarized light of intensity I0 is passed
through a polaroid A and then through another polaroid B
which is oriented so that its principal plane makes an angle
of 45° relative to that of A. The intensity of the emergent
light is -

The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by-

If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is -

At absolute zero, Si acts as -

At a specific instant emission of radioactive compound is
deflected in a magnetic field. The compound can emit
(i) electrons (ii) protons
(iii) He2+ (iv) neutrons
The emission at instant can be

Sodium and copper have work functions 2.3 eV and 4.5
eV respectively. Then the ratio of the wavelengths is nearest
to -

5. Formation of covalent bonds in compounds exhibits
[2002]

If N0 is the original mass of the substance of half-life period t1/2 = 5 years, then the amount of substance left after 15 years is [2002]