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76. A 50-metre tall antenna transmits at 107 MHz (one of the FM radio broadcast frequencies). Calculate the maximum distance from the antenna at which the transmitted signal can be […]

75. A man weighing 70 kg stands on a weighing scale which is placed in an elevator. The elevator is moving up towards its destination floor with a velocity of […]

74. The “strong nuclear force” holds the protons and neutrons (nucleons) together in the nucleus of an atom. It is found that the binding energy per nucleon (for the nucleus […]

73. Three NOT gates are connected in series and the output of the last gate is fed back to the input of the first one as shown in the figure. […]

72. The minimum light intensity that the human eye can perceive is 10–10 Wm–2. The area of the opening of our eye (the pupil) is approximately 0.4 cm–2. Consider yellow […]

71. If a projectile lifts off from the surface of the Earth with a speed of 11.2 km.s–1, then it can escape from the Earth’s gravitational field completely. This is […]

70. A copper wire having a cross sectional area of 6.62 × 10-6 m2 carries a current of 20 A. Assuming that each atom contributes one free electron to the […]

69. A jet plane lands on an aircraft carrier at 70 m/s and stops in 3 seconds. Assuming that the acceleration is constant, the jet plane travels a distance of […]

68. In Young’s double slit experiment, the slits are separated by a distance of 0.05 mm and the source emits light of two wavelengths 450 and 520 nm. If the […]

67. The magnetic field in the interior of a long current-carrying solenoid can be increased by (A) increasing the length of solenoid while keeping the number of turns per unit […]