There are only few months left for JEE Main entrance examination 2018. Engineering aspirants have already covered most of the syllabus of all subjects i.e., Physics, Chemistry and Mathematics. Now, aspirants are searching for Practice papers of the same.
To help aspirants, Subject Experts of Physics at Jagranjosh come up with the Solved Practice Paper of Physics based on the latest pattern and the syllabus of JEE Main entrance examination 2018.
About the paper:
1. There are 30 questions in this practice paper of different difficulty level i.e., easy, moderate and tough.
2. Questions from different topics like Dimension and Measurement, Gravitation, Electric Charges and Fields, Electrostatic Potential and Capacitance, Current Electricity etc are included in this paper.
3. All questions of this practice paper have solved by subject experts in a detailed manner.
Eight identical droplets of mercury (surface tension 0.55 N m-1) of radius 1 mm. All the droplets merge into one bigger drop. Find the amount of energy evolved.
(a) 24.62 × 10-5 J
(b) 27.65 × 10-6 J
(c) 24.62 × 10-6 J
(d) 27.65 × 10-5 J
In a single slit diffraction experiment, the slit width is, where is the wavelength of light used. Then on either side of the central maximum there are
(a) 4 minima, 2 secondary maxima
(b) 2 minima, 2 secondary maxima
(c) 2 minima, 4 secondary maxima
(d) 2 minima, 1 secondary maxima
A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with l
(a) ~400 m
(b) ~25 m
(c) ~150 m
(d) ~2400 m
Given, length of the building (l) is given by
l = 500m
We know that, wavelength of the wave which can be transmitted by
λ ~ 4l = 4 × 100 = 400 m
Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see
(a) no interference
(b) interference with bright bands
(c) interference with dark bands
(d) interference in which width of the fringe will be slightly increased
The refractive index of air is slightly more than 1. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.
When a nucleus in an atom undergoes α radioactive decay, the electronic energy levels of the atom
(a) do not change for any type of radioactivity
(b) change for α and β-radioactivity but not for g-radioactivity
(c) change for α-radioactivity but not for others
(d) change for β-radioactivity but not for others
α-β particle carries one unit of negative charge, an α-particle carries 2 units of positive charge and γ (particle) carries no charge, therefore electronic energy levels of the atom charges for α and β decay, but not for γ-decay.