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JEE Mains 2019 physics questions with solutions
Browse JEE Mains 2019 Physics questions with solutions. Useful for JEE, NEET, and school exam revision.
Showing 1–10 of 64 questions
- MCQmediumMagnetic effect of current
A rectangular coil (Dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted through 45° about Z-axis, then the torque on the coil is :
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Open question & full solution → - MCQmediumMagnetic effect of current
A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45°, and 40 times per minute where the dip is 30°. If B₁ and B₂ are respectively the total magnetic field due to the earth at the two places, then the ratio B₁/B₂ is best given by :
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Open question & full solution → - MCQmediumMagnetic effect of current
A paramagnetic material has 10²⁸ atoms/m³. Its magnetic susceptibility at temperature 350 K is 2.8 ×10⁻⁴. Its susceptibility at 300 K is :
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Open question & full solution → - MCQmediumSimple Harmonic Motion
Two light identical springs of spring constant k are attached horizontally at the two ends of a uniform horizontal rod AB of length λ and mass m. The rod is pivoted at its centre 'O' and can rotate freely in horizontal plane. The other ends of the two springs are fixed to rigid supports as shown in figure. The rod is gently pushed through a small angle and released. The frequency of resulting oscillation is:
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Open question & full solution → - MCQmediumGeometrical optics
In figure, the optical fiber is ℓ = 2 m long and has a diameter of d = 20 μm. If a ray of light is incident on one end of the fiber at angle θ₁ = 40°, the number of reflection it makes before emerging from the other end is close to: (Refractive index of fibre is 1.31 and sin 40° = 0.64)
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Open question & full solution → - MCQmediumCurrent electricity
A carbon resistor has the colour code Green–Orange–Yellow–Golden as shown. Find its resistance.
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Open question & full solution → - MCQmediumMagnetic effect of current
An insulating thin rod of length ℓ has linear charge density ρ(x)=ρ₀x/ℓ. The rod is rotated about an axis passing through the origin (x=0) and perpendicular to the rod. If the rod makes n rotations per second, then its time-averaged magnetic moment is:
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Open question & full solution → - MCQmediumSimple Harmonic Motion
A particle undergoing SHM has displacement x(t) = A sin(πt/90). The ratio of kinetic to potential energy at t = 210 s is:
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Open question & full solution → - MCQmediumRotational Motion
A rectangular solid box of length 0.3 m is held horizontally, with one of its sides on the edge of a platform of height 5m. When released, it slips off the table in a very short time τ = 0.01s, remaining essentially horizontal. The angle by which it would rotate when it hits the ground will be (in radians) close to:-
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Open question & full solution → - MCQmediumWave Motion
A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m (m << M). When the car is at rest, the speed of transverse waves in the string is 60 m s⁻¹. When the car has acceleration a, the wave-speed increases to 60.5 m s⁻¹. The value of a, in terms of gravitational acceleration g, is closest to:
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