Two charges placed in air repel each other by a force of 10⁻⁴ N. When oil is introduced between the charges, the force becomes 2.5 x 10⁻⁵ N. The dielectric constant of oil is
A tuning fork gives 4 beats with 50 cm length of a sonometer. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of […]
To what temperature should the hydrogen at room temperature (27°C) be heated at constant pressure so that the RMS velocity of its molecules becomes double of its previous value?
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(a) 1200° C […]
Two bodies of mass 0.25 kg each moving towards each other with velocity 3 m/s and 1 m/s respectively. After collision they stick together. The velocity of the combination will be
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(a) […]
A particle of mass m executes simple harmonic motion with amplitude a and frequency v. The average kinetic energy during its motion from the position of equilibrium to the end is
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(a) […]
Two waves represented by following equations are travelling in same medium y1=5 sin 2π (75t – 0.25x) and y2=10 sin 2π (150t – 0.50x). The intensity ratio I1/I2 of the two waves is
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The wheel of a car is rotating at the rate of 1200 rev/min. On pressing the accelerator for 10 seconds, it starts rotating at 4500 rev/min. The angular acceleration of the wheel is
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The optical path of a monochromatic light is same if it goes through 4.0 cm of glass or 4.5 cm of water. If the refractive index of glass is 1.53, the refractive index of the […]
A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden block and is stopped after a distance of 0.40m. The average resistive force exerted by the block on the […]
A light emitting diode(LED) has a voltage drop of 2 volt across it and passes a current of 10 mA when it operates with a 6 volt battery through a limiting resistor R. The value […]
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