- AA ferromagnetic material becomes paramagenetic.
- BA paramagnetic material becomes diamagnetic.
- CA ferromagnetic material becomes diamagnetic.
- DA paramagnetic meterial becomes ferromagnetic.
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| A | B | Y |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
According to Mosley's law, the frequency of a spectral line in X-ray spectrum varies as
|
(a) Atomic number of the element |
| (b) Square of the atomic number of the element |
| (c) Square root of the atomic number of the element |
|
(d) Fourth power of the atomic number of the element |
A particle moving in a magnetic field increases its velocity, then its radius of the circle
|
(a) Decreases |
(b) Increases |
(c) Remains the same |
(d) Becomes half |
Two condensers of capacities 1μF and 2 μF are connected in series and the system is charged to 120 volts. Then the P.D. on 1 μF capacitor (in volts) will be
|
(a) 40 |
(b) 60 |
(c) 80 |
(d) 120 |
The plate resistance of a triode is 2.5 × 104 W and mutual conductance is 2 × 10–3 mho. What will be the value of amplification factor
|
(a) 50 |
(b) 1.25 × 107 |
(c) 75 |
(d) 2.25 × 107 |
A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
|
(a) 1 |
(b) 2 |
(c) 5 |
(d) 10 |
Assertion : An electron and proton enters a magnetic field with equal velocities, then, the force experienced by the proton will be more than electron.
Reason : The mass of proton is 1837 times more than electron.
|
(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 assertion is false but reason is true. |
A charged particle of mass 0.003 gm is held stationary in space by placing it in a downward direction of electric field of 6 . Then the magnitude of the charge is
|
(a) 5 |
(b) 5 |
(c) -18 |
(d) -5 |