M.C.Q (1 Marks)

MCQ 11 Mark

A diode, a resistor and a 50Hz AC source are connected in series. The number of current pulses per second through the resistor is:

A
25
✓
50
C
100
D
200

Answer

Correct option: B.

The number of current pulses is equal to the frequency of the AC source because one current pulse passes through the diode for one oscillation of the AC source.

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MCQ 21 Mark

The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal:

✓
No appreciable current will pass through the diode.
B
A large current will pass through the diode from the anode to the cathode.
C
A large current will pass through the diode from the cathode to the anode.
D
The diode will be damaged.

Answer

Correct option: A.

No appreciable current will pass through the diode.

If the anode is given a negative potential relative to the cathode, the electrons are pushed back to the cathode. Hence, no current will flow through the diode.

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MCQ 31 Mark

A triode is operated in the linear region of its characteristics. If the plate voltage is slightly increased, the dynamic plate resistance will:

A
Increase.
B
Decrease.
✓
Remain almost the same.
D
Become zero.

Answer

Correct option: C.

Remain almost the same.

Dynamic resistance $(r_P)$ is given by,
$\text{r}_\text{P}=\frac{\Delta\text{V}_\text{P}}{\Delta\text{i}_\text{P}}$
The triode is operating in the linear region.
Therefore, Change in the value of voltage $=$ Change in the value of current
So, $(r_P)$ will remain almost the same.

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Physics M.C.Q (1 Marks)

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