The limiting angle of incidence for an optical ray that can be transmitted by an equilateral prism of refractive index μ=√7/3 is given by(angles can be assumed to be small, so that sine of the […]
The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights, respectively. Which of the following is correct?
Options
(a) fᵥ < fᵣ (b) fᵥ = fᵣ (c) […]
What is the energy released by fission of 1 g of U²³⁵? (Assume 200 MeV energy is liberated on fission of 1 nucleus)
Options
(a) 2.26×10⁴ kWh (b) 1.2×10⁴ kWh (c) 4.5×10⁴ kWh (d) […]
The conductivity in the intrinsic semiconductor does not depend on
Options
(a) band gap (b) temperature (c) fermi energy (d) effective mass of charge carriers
Correct Answer:
fermi energy
Explanation:
No explanation available. […]
The initial rate of increase of current, when a battery of emf 6 V is connected in series with an inductance of 2H and resistance 12Ω, is
Options
(a) 0.5 As⁻¹ (b) 1 […]
The identical loops of copper and aluminium are moving with the same speed in a magnetic field. Which of the following statements is true?
Options
(a) Induced emf and induced current are same […]
Choose the correct statement
Options
(a) Kirchhoff’s first law of electricity is based on conservation of charge while the second law is based on conservation of energy (b) kirchoff’s first law of electricity […]
The excitation potential of hydrogen atom in the first excited state is
Options
(a) 13.6 V (b) (-13.6 V) (c) 10.2 V (d) (-10 V)
Correct Answer:
10.2 V
Explanation:
Energy of […]
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 […]
A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range is to be extended to 1-500, then the following shunt resistance will be required
Options
(a) 0.010Ω (b) 0.011Ω […]
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