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In the given circuits (a), (b), and (c), the potential drop across the two p-n junctions is equal in:
The following figure shows a logic gate circuit with two inputs $A$ and $B$ and the output $Y$. The voltage waveforms of $A$, $B$ and $Y$ are as given. The logic gate is:
A solid cylinder of mass $2 \text{ kg}$ and radius $50 \text{ cm}$ rolls up an inclined plane of angle of inclination $30^\circ$. The centre of mass of the cylinder has a speed of $4 \text{ m/s}$. The distance travelled by the cylinder on the inclined surface will be [take $g= 10 \text{ m/s}^2$]:
A thin prism of angle $15^{\circ}$ made of glass of refractive index $\mu_1=1.5$ is combined with another prism of glass of refractive index $\mu_2=1.75$. The combination of the prism produces dispersion without deviation. The angle of the second prism should be:
Two thin lenses are of the same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:
RNA and DNA are chiral molecules, their chirality is due to:
A lens is made up of 3 different transparent media as shown in the figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side?
A Zener diode, having breakdown voltage equal to $15\text{ V}$, is used in a voltage regulator circuit, as shown in the figure. The current through the diode is:
The device that can act as a complete electronic circuit is:
A p-n photodiode is fabricated from a semiconductor with a band gap of $2.5\text{ eV}$. It can detect a signal of wavelength:
The electron concentration in an n-type semiconductor is the same as the hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.
The voltage gain of an amplifier with $9\%$ negative feedback is $10$. The voltage gain without feedback will be:
Sodium has body-centered packing. The distance between the two nearest atoms is $3.7\text{ \AA}$. The lattice parameter is:
In half-wave rectification, if the input frequency is $60\text{ Hz}$, the output frequency will be:
The circuit is equivalent to:
The collector current in a common base amplifier using n-p-n transistor is $24\text{ mA}$. If $80\%$ of the electrons released by the emitter are accepted by the collector, then the base current is numerically:
What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?
Given below are two statements: Statement I: Photovoltaic devices can convert optical radiation into electricity. Statement II: The Zener diode is designed to operate under reverse bias in the breakdown.
The dimensions of emf in MKS are:
Which of the following molecules acts as a Lewis acid?