- A10
- B25
- C15
- D22
Explanation:
Atomic number of any element is equal no of electron.
Atomic no. = no. of proton = no of electron.
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A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
The half life of
is 8 days. Given a sample of
at time t = 0, we can assert that
|
(a) No nucleus will decay before t = 4 days |
|
(b) No nucleus will decay before t = 8 days |
|
(c) All nuclei will decay before t = 16 days |
|
(d) A given nucleus may decay at any time after t = 0 |
Assertion : The poles of magnet cannot be separated by breaking into two pieces.
Reason : The magnetic moment will be reduced to half when a magnet is broken into two equal pieces.
|
(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. |
A diode is connected to 220 V (rms) ac in series with a capacitor as shown in figure. The voltage across the capacitor is

|
(a) 220 V |
(b) 110 V |
(c) 311.1 V |
(d) |
The time constant of an LR circuit represents the time in which the current in the circuit
|
(a) Reaches a value equal to about 37% of its final value |
|
(b) Reaches a value equal to about 63% of its final value |
|
(c) Attains a constant value |
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(d) Attains 50% of the constant value |
Consider the charge configuration and spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface the electric field will be due to

|
(a) |
(b) Only the positive charges |
|
(c) All the charges |
(d) + |