What is the stopping potential when the metal with work function 0.6 eV is illuminated with the light of 2 eV
|
(a) 2.6 V |
(b) 3.6 V |
(c) 0.8 V |
(d) 1.4 V |
(d) 1.4 V
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Dark lines on solar spectrum are due to
|
(a) Lack of certain elements |
|
(b) Black body radiation |
|
(c) Absorption of certain wavelengths by outer layers |
|
(d) Scattering |
In Millikan oil drop experiment, a charged drop of mass 1.8 
is stationary between its plates. The distance between its plates is 0.90 cm and potential difference is 2.0 kilo volts. The number of electrons on the drop is
|
(a) 500 |
(b) 50 |
(c) 5 |
(d) 0 |
In a thermocouple, the temperature that does not depend on the temperature of the cold junction is called
|
(a) Neutral temperature |
(b) Temperature of inversion |
|
(c) Both the above |
(d) None of the above |
Work of electric motor is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) To convert ac into mechanical work |
A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be
|
(a) 4 Ω |
(b) 8 Ω |
(c) 0.25 Ω |
(d) 2 Ω |
A beam of electrons and protons move parallel to each other in the same direction, then they
|
(a) Attract each other |
(b) Repel each other |
|
(c) No relation |
(d) Neither attract nor repel |