A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 8:1. The ratio of radii of the fragments is
Options
(a) (1:2) (b) (1:4) (c) (4:1) […]
A choke is preferred to a resistance for limiting current in AC circuit because
Options
(a) Choke is cheap (b) There is no wastage of power (c) Choke is compact in size (d) […]
A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. […]
The dimensional formula for Young’s modulus is
Options
(a) [ML⁻¹T⁻²] (b) [M⁰LT⁻²] (c) [MLT⁻²] (d) [ML²T⁻²]
Correct Answer:
[ML⁻¹T⁻²]
Explanation:
Young’s modulus Y=Stress/Strain=(Force/Area)/(elongation/Iength)
Y=[MLT⁻²][L]/[L²][L] = [ML⁻¹T⁻²]
The heat dissipated in a resistance can be obtained by measuring of resistance, the current and time. The maximum error in the measurement of these quantities is 1%, 2% and 1% respectively. The maximum error […]
A uniform chain of length L and mass m is kept on a smooth table. It is released from rest when the overhanging part was nᵗʰ fraction of total length. Find the kinetic energy of […]
A bomb of mass 16 kg at rest explodes into two pieces of masses of 4 kg and 12 kg. The velocity of the 12 kg mass is 4 ms⁻¹. The kinetic energy of the […]
A sound source is moving towards a stationary listener with 1/10th of the speed of sound. The ratio of apparent to real frequency is
Options
(a) (10/9) (b) (10/9)² (c) (11/10)² (d) (11/10)
If the length of a closed organ pipe is 1.5 m and velocity of sound is 330 m/s, then the frequency for the second note is
Options
(a) 220 Hz (b) 165 Hz […]
The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through a long slit with width 0.2×10⁻³ m. The angular divergence in which most of the light is
Options
(a) 4.5×10⁻³rad […]
2017-2025 Copyright Doctor Dreams Training Academy - About Us - Privacy Policy - Terms & Conditions - Contact Us - Refund Policy