An electron is
An electron is
Options
(a) Hardon (b) Baryon (c) a nucleon (d) a lepton
Correct Answer:
a lepton
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
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An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz. Speed of sound in air=350 ms⁻¹. The frequency of the note after reflection from the wall as […]
A radioactive element forms its own isotope after 3 consecutive disintegrations.
A radioactive element forms its own isotope after 3 consecutive disintegrations. The particle emiited are
Options
(a) 3 β-particles (b) 2 β-particles and 1 α-particle (c) 2 β-particles and 1 γ-particle (d) 2 […]
All components of the electromagnetic spectrum in vacuum have the same
All components of the electromagnetic spectrum in vacuum have the same
Options
(a) Energy (b) Velocity (c) Wavelength (d) Frequency
Correct Answer:
Velocity
Explanation:
No explanation available. Be the first to write the […]
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100 V. The self inductance of the coil is
Options
(a) 0.25 H (b) 0.4 […]
The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg)
The de-Broglie wavelength of a proton(charge = 1.6 x 10⁻¹⁹ C, Mass = 1.6 x 10⁻²⁷ kg) accelerated through a potential difference of 1 kV is
Options
(a) 600 Å (b) 0.9 x […]
A carnot’s engine operates with source at 127° C and sink at 27°C
A carnot’s engine operates with source at 127° C and sink at 27° C. If the source supplies 40 kJ of heat energy, the work done by the engine is
Options
(a) 30 […]
When the angle of incidence is 60° on the surface of a glass slab, it is found
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
Options
(a) √2 […]
The number of mitotic cell division required to produce 256 cells from single cell
The number of mitotic cell division required to produce 256 cells from single cell would be
Options
(a) 10 (b) 12 (c) 6 (d) 8
Correct Answer:
8
Explanation:
No explanation available. Be […]
A radioactive substance contains 10000 nuclei and its halflife period is 20 days
A radioactive substance contains 10000 nuclei and its halflife period is 20 days. The number of nuclei present at the end of 10 days is
Options
(a) 7070 (b) 9000 (c) 8000 (d) […]