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Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is
An electric dipole is placed along the Xaxis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle π/3 with the X axis. If electric field at P makes an angle θ with Xaxis, the value of θ is
A semi circle arc of radius 'a' is charged uniformly and the charge per unit length is λ. The electric field at its centre is
Which of the following equations is definitely wrong?
A 2 kg mass is rotating on a circular path of radius 0.8 m with angular velocity of 44 rads^{1}. If radius of the path becomes 1 m, then value of angular velocity will be
For a gas, if the ratio of specific heats at constant pressure and volume is γ, then the value of degree of freedom is
In a mixture of H−He^{+} gas (He^{+} is singly ionized He atom) , H atoms and He^{+} ions are excited to their respective first excited states. Subesquently, H atoms transfer their total excitation energy to He^{+} ions (by collisions). Assume that the Bohr model of atom is exactly vaild.
Q. The quantum number n of the state finally populated in He^{+} ions is
A biconvex thin lens is prepared from glass of refractive index µ_{2} = 3/2. The two converging surface have equal radii of 20cm each. One of the surface is silvered from outside to make it reflecting. It is placed in a medium of refractive index µ_{1} = 5/3. This system will behave as concave mirror of focal length f, find value of f in cm.
Find the maximum kinetic energy (in eV) of the photoelectron liberated from the surface of lithium (work function φ = 2.15eV) by electromagnetic radiation whose electric component varies with time as E = a (1 + cos ωt)cosω_{0}t,
where a is a constant, ω = 12 × 10^{14} rads^{–1} and ω_{0} = 3.6 × 10^{15} rads^{–1} (h = 6.6 × 10^{–34} in SI units)
A photosensitive surface is irradiated with light of wavelength λ, the stopping potential is V. When the same surface is irradiated with the light of wavelength 2λ, stopping potential is V/3. Then the ratio of threshold wavelength (λ_{max}) and the λ is
One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point A and zero deflection is observed at length PJ = 30 cm. In second case the secondary cell is changed. Take E_{S} = 10 V and r = 1Ω in 1^{st} reading and E_{S} = 5V and r = 2Ω in 2^{nd} reading. In second case, the zero deflection is observed at length PJ = 10 cm. What is the resistance R (in ohm)?
A uniform triangular plate of triangular area 1m^{2}, base length 60 cm and thickness 10 mm (prism like shape) is lying vertically on a smooth ground as shown in figure. Find maximum value of cotθ for which it does not topple.
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JEE Main Physics Mock Test 9 Test  25 ques 