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 […]
A beam of light contains two wavelengths 6500Å and 5200Å. They form interference fringes in Young’s double slit experiment. What is the least distance (approx) from central maximum, where the bright fringes due to both […]
An ideal gas is expanding such that PT²=constant. The coefficient of volume expansion of the gas is
Options
(a) 1/T (b) 2/T (c) 3/T (d) 4/T
Correct Answer:
3/T
Explanation:
No explanation available. […]
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