Substance having permeability less than the permeability of free space, are known as ferromagnetic. paramagnetic. diamagnetic. bipolar. TRUE ANSWER : ? YOUR ANSWER : ?
The permanent magnets are made from which of following materials ? Ferromagnetic. Diamagnetic. Paramagnetic. Soft iron. TRUE ANSWER : ? YOUR ANSWER : ?
All ions of an element have the same number of protons. both option A. and C. atomic number. number of electrons. TRUE ANSWER : ? YOUR ANSWER : ?
Positive magnetostriction exists when dipoles are attract each other. dipoles are repel other. both are correct. none of above. TRUE ANSWER : ? YOUR ANSWER : ?
Cryogenics is a branch of science dealing with which of the following? Friction and wear. Crystal growth. Low temperature. High temperature. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the example for piezo-electric material ? Potassium niobate None of these Copper Lead zirconate titanate TRUE ANSWER : ? YOUR ANSWER : ?
The dielectric strength of ferroelectric materials depends to a large extent on frequency of applied voltage. intensity of electric field. area of hysteresis loop for the material. presence of magnetic materials in the vicinity. TRUE ANSWER : ? YOUR ANSWER : ?
Permanent magnets are used in motors. loud speakers. all of above. generators. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following statements is not part of Daltons atomic theory? An atom contains a dense central nucleus. Atoms of different elements are quite different. Atoms can combine to form compounds. All matter is composed of atoms. TRUE ANSWER : ? YOUR ANSWER : ?