Practice Set 1

A heat engine is involved with exchange of heat of 1915 J, – 40J, + 125 J and –Q J, during one cycle achieving an efficiency of 50.0%. The value of Q is – 40J + 125 J and –Q J A heat engine is involved with exchange of heat of 1915 J during one [...]

In a hydrogen like atom electron make transition from an energy(n + 1)th level with quantum number nth level. If n >> 1, the frequency of radiation emitted is proportional to In a hydrogen like atom electron make transition from an energy(n + 1)th level with quantum number nth level. If n >> 1 the [...]

A 10 μF capacitor is fully charged to a potential difference of 50 V. After removing the source voltage it is connected to an uncharged capacitor in parallel. Now the potential difference across them becomes 20 V. The capacitance of the second capacitor is area A and force F are chosen as fundamental units If [...]

When the temperature of a metal wire is increased from 0°C to 10°C, its length increases by 0.02%. The percentage change in its mass density will be closest to its length increases by 0.02%. The percentage change in its mass density will be closest to When the temperature of a metal wire is increased from [...]

If momentum (P), area (A) and time (T) are taken to be the fundamental quantities then the dimensional formula for energy is area (A) and time (T) are taken to be the fundamental quantities then the dimensional formula for energy is If momentum (P) September 18, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions [...]

The figure shows a region of length ‘l’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity 4 × 10^5 ms^–1 making an angle 60° with the field. If the proton completes 10 revolution by the time it cross the region shown, ‘l’ is close to [...]

The height ‘h’ at which the weight of a body will be the same as that at the same depth ‘h’ from the surface of the earth is (Radius of the earth is R and effect of the rotation of the earth is neglected) area A and force F are chosen as fundamental units If [...]

An inductance coil has a reactance of 100 Ω. When ac signal of frequency 1000 Hz is applied to the coil, the applied voltage leads the current by 45°. Calculate the self-inductance of the coil. An inductance coil has a reactance of 100 Ω. When ac signal of frequency 1000 Hz is applied to the [...]

A capillary tube made of glass of radius 0.15mm is dipped vertically in a beaker filled with methylene iodide which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60∘ with one another. Then h is [...]

A 5μF capacitor is charged fully by a 220 V supply. It is then disconnected from the supply and is connected in series to another uncharged 2.5μF capacitor. If the energy change during the charge redistribution is X/100 J 100 then value of X to the nearest integer is …… area A and force F [...]