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Easy
Question
A p–n junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit
The correct answer is:
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The equivalent resistance between A and B is
The equivalent resistance between A and B is
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The equivalent resistance of the circuit across AB is given by
The equivalent resistance of the circuit across AB is given by
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Find the effective resistance between A & B
Find the effective resistance between A & B
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4 ideal diodes are connected as shown in the circuit the current through 50W is
4 ideal diodes are connected as shown in the circuit the current through 50W is
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The circuit shown in figure (A) Contains two diodes each with a forward resistance of 50 ohm and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 100 ohm resistance is.
The circuit shown in figure (A) Contains two diodes each with a forward resistance of 50 ohm and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 100 ohm resistance is.
physics-General
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A PN junction diode when forward biased has a drop of 0.5V which is assumed to be independent of current. The current in excess of 10mA through the diode produces large joule heating which damages the diode. If we want to use a 1.5V battery to forward bias the diode, the resistor used in series with the diode so that the maximum current does not exceed 5mA is
A PN junction diode when forward biased has a drop of 0.5V which is assumed to be independent of current. The current in excess of 10mA through the diode produces large joule heating which damages the diode. If we want to use a 1.5V battery to forward bias the diode, the resistor used in series with the diode so that the maximum current does not exceed 5mA is
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If V1> V2 ,r is resistance offered by diode in forward bias then current through the diode is
If V1> V2 ,r is resistance offered by diode in forward bias then current through the diode is
Physics-General
physics-
Two similar p-n junctions can be connected in three different ways as shown in the figures. The two connections across which the potential difference is same are
a) 
b) 
c) 
Two similar p-n junctions can be connected in three different ways as shown in the figures. The two connections across which the potential difference is same are
a)
b)
c)
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In the following , reverse biased diode is
In the following , reverse biased diode is
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The P.V. diagram of a certain process (Carnot cycle) is as shown in the figure.
The process is represented as
The P.V. diagram of a certain process (Carnot cycle) is as shown in the figure.
The process is represented as
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The following graphs shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. speed of the molecules at temperatures T1 and T2 is
The following graphs shows two isotherms for a fixed mass of an ideal gas. The ratio of r.m.s. speed of the molecules at temperatures T1 and T2 is
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A volume V-temperature T diagram was obtained when a given mass of gas was heated. During the heating process from state 1 to state 2, the pressure :
A volume V-temperature T diagram was obtained when a given mass of gas was heated. During the heating process from state 1 to state 2, the pressure :
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Two identical glass spheres filled with air are connected by a thin horizontal glass tube. The glass tube contains a pellet of mercury at its mid-point. Air in one sphere is at 0°C and the other is at 20°C. If temperature of both the vessels are increased by 10°C, then neglecting the expansions of the bulbs and the tube
Two identical glass spheres filled with air are connected by a thin horizontal glass tube. The glass tube contains a pellet of mercury at its mid-point. Air in one sphere is at 0°C and the other is at 20°C. If temperature of both the vessels are increased by 10°C, then neglecting the expansions of the bulbs and the tube
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There are two identical vessels containing same quantity of an ideal gas at same pressure. Vessel A is placed in a train moving with constant speed and the vessel B is placed on the platform. In the frame of an observer standing on the plateform, select the correct statement
There are two identical vessels containing same quantity of an ideal gas at same pressure. Vessel A is placed in a train moving with constant speed and the vessel B is placed on the platform. In the frame of an observer standing on the plateform, select the correct statement
Physics-General
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Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of 2 : 1.
The ends are maintained at temperatures 
as shown with 
and sides are thermally insulated.
Which of the following graph represents temperature gradient (dT/dx) against x in steady state
Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of 2 : 1.
The ends are maintained at temperatures as shown with and sides are thermally insulated.
Which of the following graph represents temperature gradient (dT/dx) against x in steady state
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