Related InterviewSolutions

• Using a nuclear counter, the count rate of emitted particles from a radioactive source is measured. At t = 0, it was 1600 counts per second and t = 8 s, it was 100 counts per second. The count rate observed as counts per second at t = 6s is close to1. 4002. 2003. 1504. 360
• The quantisation of charge was first suggested by ________________1. Michael Faraday2. Sir Issac Newton3. Rutherford4. Max Planck
• An electron has a mass of 9.1 × 10-31 kg. It revolves round the nucleus in a circular orbit of radius 0.529 × 10-10 metre at a speed of 2.2 × 106 m/s. The magnitude of its linear momentum in this motion is1. 1.1 × 10-34 kg – m/s2. 2.0 × 10-24 kg – m/s3. 4.0 × 10-24 kg – m/s4. 4.0 × 10-31 kg – m/s
• A laser produces intense, monochromatic, coherent light by which of the following process?1. stimulated absorption2. stimulated emission3. bremsstrahlung4. spontaneous emission
• Which of the following was the first working laser?1. Disk laser2. Ruby laser3. Carbon dioxide laser4. Argon – ion laser
• Consider the nuclear fissionNe20 → 2He4 + C12Given that the binding energy/nucleon of Ne20, He4 and C12 are respectively, 8.03 MeV, 7.07 MeV and 7.86 MeV, identify the correct statement.1. Energy of 3.6 MeV will be released2. Energy of 12.4 MeV will be supplied3. 8.3 MeV energy will be released4. Energy of 9.72 MeV has to be supplied
• A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the speed of the train is reduced to 17 m/s, the frequency registered is f2. If speed of sound is 340 m/s, then the ratio \(\frac{{{f_1}}}{{{f_2}}}\) is 1. \(\frac{{19}}{{18}}\)2. \(\frac{{21}}{{20}}\)3. \(\frac{{20}}{{19}}\)4. \(\frac{{18}}{{17}}\)
• The diameter and height of a cylinder are measured by a meter scale to be 12.6 ± 0.1 cm and 34.2 ± 0.1 cm, respectively. What will be the value of its volume in appropriate significant figures?1. 4300 ± 80 cm32. 4260 ± 80 cm33. 4264.4 ± 81.0 cm34. 4264 ± 81 cm3
• Five identifiable particles are distributed in three non-degenerate levels with energies 0, E and 2E. The most probable distribution for total energy, 3E corresponds to what combination of options given below?1. N1 = 1, N2 = 2, N3 = 32. N1 = 3, N2 = 1, N3 = 13. N1 = 2, N2 = 3, N3 = 14. None
• Two rods A and B of identical dimensions are at temperature 30°C. If A is heated upto 180°C and B upto T°C, then new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is 4 : 3, then the value of T is1. 230° C2. 270° C3. 200° C4. 250° C