JAM Physics Question Paper 2019 Download Free PDF
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JAM Physics Question Paper 2019
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Q.1. A thin lens of refractive index 3/2 is kept inside a liquid of refractive index 4/3. If the focal length of the lens in air is 10 cm, then its focal length inside the liquid is
(A) 10 cm
(B) 30 cm
(C) 40 cm
(D) 50 cm
Q.2. The mass per unit length of a rod (length 2 m) varies as ρ = 3x kg/m. The moment of inertia (in kg m²) of the rod about a perpendicular-axis passing through the tip of the rod (at x = 0)
Q.3. The amount of work done to increase the speed of an electron from c/3 to 2c/3 is
(c = 3×108 m/s and rest mass of electron is 0.511 MeV)
(A) 56.50 keV
(B) 143.58 keV
(C) 168.20 keV
(D) 511.00 keV
Q.4. During free expansion of an ideal gas under adiabatic condition, the internal energy of the gas
(B) Initially decreases and then increases
(D) Remains constant
Q.5. The gradient of a scalar field S(x,y,z) has the following characteristic(s)
(A) Line integral of a gradient is path-independent
(B) Closed line integral of a gradient is zero
(C) Gradient of S is a measure of the maximum rate of change in the field S
(D) Gradient of S is a scalar quantity
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