A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The coefficient of static friction between wall and body is 0.3. Then the frictional force […]
A current is flowing through resistance. A potential difference of 120 V is applied across resistance. Power dissipated in resistance is 60W. Find current flowing through it
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(a) 2 A (b) 0.5 […]
The time period of bar magnet is doubled when magnetic field is reduced by same amount. If initial magnetic field is 0.4 x 10⁻⁴ T then find out decrease in the magnetic field
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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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