Ohm’s law valid
Ohm’s law valid
Options
(a) only for conductors (b) for semiconductors (c) for triode valves (d) for all materials
Correct Answer:
only for conductors
Explanation:
No explanation available. Be the first to write […]
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Length of a conductor is 50 cm radius of cross section 0.1 cm and resistivity
Length of a conductor is 50 cm radius of cross section 0.1 cm and resistivity of the conductor=5×10⁻⁵ Ω cm⁻¹. The resistance is
Options
(a) 8×10⁻² Ω (b) 8×10⁻³ Ω (c) 8×10⁻¹ W […]
The emission line of Lyman corresponds to the absorption line in laboratory temperature
The emission line of Lyman corresponds to the absorption line in laboratory temperature. The emission line of Balmer at room temperature
Options
(a) corresponds to the absorption line of Balmer series (b) does […]
In which case positive work has to be done in seperating them?
In which case positive work has to be done in seperating them?
Options
(a) electron-electron (b) proton-proton (c) neutron-neutron (d) electron-neutral atom
Correct Answer:
electron-neutral atom
Explanation:
No explanation available. Be the first […]
The order of distance of an electron revolving in an atom from nucleus is
The order of distance of an electron revolving in an atom from nucleus is
Options
(a) 10⁻¹² m (b) 10⁻¹⁰ m (c) 10⁻⁸ m (d) 10⁻¹⁴ m
Correct Answer:
10⁻¹⁴ m
Explanation:
No […]
Mass and diameter of a ring is 2 kg and 1 m respectively. The moment of inertia
Mass and diameter of a ring is 2 kg and 1 m respectively. The moment of inertia of ring about an axis is passing through its C.M. and perpendicular to the plane of the ring […]
In N-type semi-conductor current is due to
In N-type semi-conductor current is due to
Options
(a) Electrons (b) Holes (c) Electrons and holes (d) None of these
Correct Answer:
Electrons
Explanation:
No explanation available. Be the first to write the […]
If the minimum energy of photons needed to produce photoelectrons is 3 eV,
If the minimum energy of photons needed to produce photoelectrons is 3 eV, bombardinbg the photoelectric material by a number of photons of 2.5 eV also one can get
Options
(a) Photoelectrons of […]
The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation
The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation potential of the hydrogen atom is
Options
(a) (-13.6 eV) (b) (13.6 V) (c) (+13.6 eV) (d) more than (-13.6 […]
Length of second pendulum is
Length of second pendulum is
Options
(a) 100 cm (b) 60 cm (c) 120 cm (d) 80 cm
Correct Answer:
100 cm
Explanation:
No explanation available. Be the first to write the explanation […]