The mean distance between the atoms of iron is 3 x 10⁻¹⁰ m and interatomic force constant for iron is 7 N/m. The Young’s modulus of elasticity for iron is
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(a) 2.33 […]
An unpolarised beam of intensity I is incident on a pair of nicols making an angle of 60° with each other. The intensity of light emerging from the pair is
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(a) I […]
A magnetic field of 1600 A/m produces a magnetic flux of 2.4 x 10⁻⁵ Wb in an iron bar of cross-sectional area 0.2 cm². The susceptibility of the iron bar is
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(a) […]
The total energy of a particle executing SHM is 80 J. What is the potential energy when the particle is at a distance of 3/4 of amplitude from mean position
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(a) 60 […]
An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be
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A 10 micro farad capacitor is charged to 500 V and then its plates are joined together through a resistance of 10 ohm. The heat produced in the resistance is
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(a) 500 […]
A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass if 6 m/s. The kinetic energy of the other mass […]
The masses of two radioactive substances are same and their half lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be
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(a) 1 : […]
In a water fall, the water falls from a height of 100 m. If the entire kinetic energy of water is converted into heat, the rise in temperature of water will be
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When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
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(a) √2 […]
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