In the half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
Options
(a) 25 Hz (b) 50 Hz (c) 70.7 Hz (d) 100 Hz
Correct […]
In communication with help of antenna if height is doubled then the range covered which was initially r would become
Options
(a) √2r (b) 3r (c) 4r (d) 5r
Correct Answer:
√2r
Explanation:
Range […]
If the highest modulating frequency of the wave is 5 kHz, the number of stations that can be accomodated in a 150 kHz bandwidth?
Options
(a) 15 (b) 10 (c) 5 (d) None of […]
Which wavelengths of sun is used finally as electric energy?
Options
(a) Radio waves (b) Infra red waves (c) Visible light (d) Micro waves
Correct Answer:
Infra red waves
Explanation:
Infrared rays or heat […]
What is the energy of He⁺ electron in first orbit?
Options
(a) (40.8 eV) (b) (-52.2 eV) (c) (-54.4 eV) (d) (-13.6 eV)
Correct Answer:
(-54.4 eV)
Explanation:
No explanation available. Be the […]
What is the energy of photon whose wavelength is 6840 Å?
Options
(a) (1.81 eV) (b) (3.6 eV) (c) (-13.6 eV) (d) (12.1 eV)
Correct Answer:
(1.81 eV)
Explanation:
λ = 6840 Å .·. […]
Calculate power output of ₉₂²³⁵U reactor, if it takes 30 days to use up 2 kg of fuel, and if each fission gives 185 MeV of useable energy. Avagadro’s number=6×10²³/mol?
Options
(a) 56.3 […]
In an AC circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference of the source is
Options
(a) 20.0 […]
A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s. The frequency of sound heard by listener is (velocity of sound = 300 m/s) […]
Which of the two have same dimensions?
Options
(a) Force and strain (b) Force and stress (c) Angular velocity and frequency (d) Energy and strain
Correct Answer:
Angular velocity and frequency
Explanation:
No […]
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