Semiconductor Electronics : Materials Devices and Simple Circuits — Physics STD 12 Science — Question

A positive charge is moving vertically upwards in the magnetic field towards the south. In which direction will it be deflected?

After five half lives what will be the fraction of initial substance

Two identical cycle wheels (geometrically) have different number of spokes connected from center to rim. One is having 20 spokes and the other having only 10 (the rim and the spokes are resistanceless). One resistance of value R is connected between center and rim. The current in R will be.

Which of the following shown particle nature of light(a) Refraction(b) Interference(c) Polarization(d) Photoelectric effect

Sun radiates continuously and maintains its brightness because(a) Helium is converted into iron in its core(b) Of fusion of hydrogen nuclei into helium(c) Fusion of helium in hydrogen(d) Burning of carbon, in its core

A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire(a) Will be doubled(b) Will be halved(c) Will remain the same(d) Will be quadrupled

Which principle suggests that the intensity of light determines its amplitude?

A constant current i is passed through a resistor.  Taking the temperature coefficient of resistance into account, indicate which of the plots shown in figure best represents the rate of production of thermal energy in the resistor