SBI GK Questions 2026

A passive tag is only a chip and an antenna. When it enters the field of a reader, the incoming radio waves induce a current in the antenna, that current powers the chip for an instant, and the chip replies by modulating the reflected signal, a method called backscatter.

NFC is built on the high frequency band of radio frequency identification and uses magnetic induction between two loop antennas at 13.56 MHz, which is why the devices must be brought within about four centimetres of each other.

In a piconet one device acts as the master and sets the clock and the hopping sequence, and up to seven other devices can be active slaves at the same time, which makes eight devices in the piconet in all.

The 802.15 group of standards covers wireless personal area networks, and 802.15.1 is the one that was drawn from the Bluetooth specification; the technology itself is now developed by the Bluetooth Special Interest Group.

Wi-Fi operates in the unlicensed industrial, scientific and medical bands, and the two classic bands are 2.4 GHz and 5 GHz, with 6 GHz added in the latest equipment.

The BNC connector is the bayonet-fitting plug that is pushed on and given a quarter turn to lock, and it terminates a coaxial cable, the cable with a central copper conductor, an insulating layer, a braided metal shield and an outer jacket.

The RJ-11 is the small modular connector at the end of a telephone cord, with four or six positions and usually two or four contacts, and it was also used to join a dial-up or ADSL modem to the telephone line.

Fibre carries data as pulses of light travelling through a glass or plastic core by total internal reflection, and since no electric current flows in it, an external electromagnetic field cannot induce noise in the signal.

The correct answer is B, 480 megabits per second, the speed known as high speed in the USB 2.0 specification.

LPT stands for line print terminal, the name by which the operating system knew the parallel port, which used a twenty-five-pin DB-25 connector on the computer and a thirty-six-pin Centronics connector at the printer end.

A computer with PS/2 ports has two six-pin mini-DIN sockets that are identical in shape, so they are distinguished by colour: purple for the keyboard and green for the mouse.

Unshielded twisted pair cable has no metal foil or braid around its pairs, so it resists electromagnetic interference less well than shielded twisted pair, not better; the only protection it has is the twisting of each pair, which cancels much of the noise picked up by the two wires.

The High-Definition Multimedia Interface carries high-definition digital video and multi-channel digital audio in the same cable, which is why one HDMI lead is enough to join a computer to a television or a projector.

The Video Graphics Array connector is a D-shaped plug with fifteen pins in three rows of five, usually coloured blue, and it carries an analogue video signal only, so a separate cable is needed for sound.

The standard first appeared in 1996 and was meant to replace the many different ports of an older computer with one socket for every kind of peripheral.

The RJ-45 connector is properly called 8P8C, meaning eight positions and eight contacts, and it is crimped on to the four twisted pairs of a network cable, one contact for each of the eight wires.

It was set up in 1988 on the recommendation of the Vaghul Working Group to deal in short-term instruments such as treasury bills and commercial bills and so give depth and liquidity to the money market; it later became a primary dealer.

Cash Management Bills were introduced by the Government of India and the Reserve Bank in 2010 to meet temporary mismatches in the government's cash flow, and they are issued for periods shorter than 91 days, sometimes for just a few weeks.

M1, narrow money, is the most liquid aggregate: currency, that is notes and coins, with the public, plus the demand deposits of banks, which are withdrawable at any time, plus other deposits with the Reserve Bank, a small residual item.

In a repo the bank that needs funds sells government securities to the Reserve Bank and simultaneously agrees to repurchase them a day or a few days later at a slightly higher price; the difference is the interest, and the rate charged is the repo rate, which is the policy…