A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E₀ and a resistance r₁. An unknown e.m.f. E is balanced at a length l of […]
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30⁰, the box starts to slip and slides 4.0 […]
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, […]
A particle is executing a simple harmonic motion. Its maximum acceleration is α and maximum velocity is β. Then, its time period of vibration will be
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(a) β²/α (b) 2πβ/α (c) β²/α² […]
A parallel plate air capacitor has capacity C, distance of seperation between plate is d and potential difference V is applied between the plates. Force of attraction between the plates of the parallel plate air […]
A nucleus of uranium decays at rest into nuclei of thrrium and helium. Then
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(a) The helium nucleus has more momentum than the thorium nuclues (b) The helium nucleus has less kinetic […]
A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, […]
A beam of light consisting of red, green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red,green and blue wavelengths are […]
A ball is thrown vertically downwards from a height of 20 m with an initially velocity v₀. It collides with the ground, loses 50 percent of its energy in collision and rebunds to the same […]
4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0 JK⁻¹ mol⁻¹. If the speed of sound in this gas at NTP is […]
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