Question : Rishu wants to input data into the computer by pressing the keys. Which input device should he use?

Option 1: Keyboard

Option 2: Scanner

Option 3: Joystick

Option 4: Light Pen

Question : Which of the following is an input device?

Option 1: Speaker

Option 2: Keyboard

Option 3: Plotter

Option 4: Printer

Question : Which of the following is an output device?

Option 1: OCR device

Option 2: Projector

Option 3: MICR (Magnetic Ink Character Recognition)

Option 4: Scanner

Question : Which experiment was designed to trace the motion of the earth through the 'luminiferous aether', a theoretical substance necessary for the transmission of light?

Option 1: Maxwell and Hertz's experiment

Option 2: Faraday and Henry's experiment

Option 3: Michelson-Morley's experiment

Option 4: Marconi and Thomson's experiment

Question : ____________ states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure.

Option 1: Tyndall's Law

Option 2: Pascal's Law

Option 3: Graham's Law

Option 4: Kepler's Law