Give the truth table and circuit symbol for NAND gate.

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by

In a common base mode of a transistor, t collector current is 5.488 mA for an emit current of 5.60 mA. The value of the base current amplification factor (β) will be

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

In the following, which one of the diodes is reverse biased?

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap in (eV) for the semiconductor is