- AHeavy.
- BStrong.
- CGood absorber.
- DBad conductor.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
According to de-Broglie, the de-Broglie wavelength for electron in an orbit of hydrogen atom is 10–9 m. The principle quantum number for this electron is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
Assertion : The specific charge of positive rays is not constant.
Reason : The mass of ions varies with speed.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Which of the following particles are constituents of the nucleus
|
(a) Protons and electrons |
(b) Protons and neutrons |
|
(c) Neutrons and electrons |
(d) Neutrons and positrons |
Radius of
nucleus is 3 Fermi. The radius of
nucleus will be
|
(a) 5 Fermi |
(b) 6 Fermi |
(c) 11.16 Fermi |
(d) 8 Fermi |
The slope of plate characteristic of a vacuum tube diode for certain operating point on the curve is
The plate resistance of the diode and its nature respectively
|
(a) 100 kilo-ohms static |
(b) 1000 kilo-ohms static |
|
(c) 1000 kilo-ohms dynamic |
(d) 100 kilo-ohms dynamic |
Assertion : Two P-N junction diodes placed back to back, will work as a NPN transistor.
Reason : The P-region of two PN junction diodes back to back will form the base of NPN transistor.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
For a given plate-voltage, the plate current in a triode is maximum when the potential of
|
(a) The grid is positive and plate is negative |
(b) The grid is positive and plate is positive |
|
(c) The grid is zero and plate is positive |
(d) The grid is negative and plate is positive |
The graph which represents the relation between the total resistance R of a multi range moving coil voltmeter and its full scale deflection V is
|
(a) (i) |
(b) (ii) |
(c) (iii) |
(d) (iv) |