JEE Main 20257 Apr, Morning shift

Physics 16Chemistry 19

Physics

Q26A lens having refractive index 1.6 has focal length of 12 cm, when it is in air. Find the focal length of the lens when it is placed in water. (Take…Optics
Q28The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility χ Mg =1.2×10⁻⁵)…Magnetic Effects of Current and Magnetism
Q29Two projectiles are fired from ground with same initial speeds from same point at angles (45°+α) and (45°-α) with horizontal direction. The ratio of their…Kinematics
Q30If ε₀ denotes the permittivity of free space and Φ E is the flux of the electric field through the area bounded by the closed surface, then dimensions of…Electromagnetic Waves
Q31For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series isAtoms and Nuclei
Q32An ac current is represented as i=5 2+10 cos (650π t+(π)/6) Amp. The r.m.s value of the current isElectromagnetic Induction and Alternating Currents
Q36Two wires A and B are made of same material having ratio of lengths L A /L B =1/3 and their diameters ratio d A /d B =2. If both the wires are stretched using…Properties of Solids and Liquids
Q37In a hydrogen like ion, the energy difference between the 2nd excitation energy state and ground is 108.8 eV. The atomic number of the ion is:Atoms and Nuclei
Q40Two plane polarized light waves combine at a certain point whose electric field components are E₁=E₀ sin ω t, E₂=E₀ sin (ω t+(π)/3). Find the amplitude of the…Optics
Q41Match the LIST-I with LIST-II. LIST-I: A. Triatomic rigid gas; B. Diatomic non-rigid gas; C. Monoatomic gas; D. Diatomic rigid gas. LIST-II: I. C p /C v =5/3…Kinetic Theory of Gases
Q42A cubic block of mass m is sliding down on an inclined plane at 60° with an acceleration of g/2, the value of coefficient of kinetic friction isLaws of Motion
Q43Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially, 10 cm apart. The power of this combination is:Optics
Q44Two harmonic waves moving in the same direction superimpose to form a wave x=a cos (1.5t) cos (50.5t) where t is in seconds. Find the period with which they…Oscillations and Waves
Q45An object of mass 1000 g experiences a time dependent force F=(2t i+3t² j) N. The power generated by the force at time t is:Work, Energy and Power
Q47A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727° C and power radiated by the wire is 94.2 W. Its emissivity…Thermodynamics
Q50A container contains a liquid with refractive index of 1.2 up to a height of 60 cm and another liquid having refractive index 1.6 is added to height H above…Optics