A. transfer of electrons between atoms
B. sharing of electrons between atoms
E. sharing of variable number of electrons by a variable number of atoms
D. none of the above
Related Mcqs:
- Which of the following materials does not have covalent bonds ?
A. Organic polymers
B. Silicon
C. Metals - The conductivity of a conductor can be increased by_______________?
A. decreasing its temperature
B. increasing its temperature
C. decreasing its vibration
D. increasing its vibration - In a crystal, an atom vibrates at a frequency determined by_______________?
A. the heat content of the crystal
B. the temperature of the crystal
C. the stiffness of the bonds it makes with neighbors - The tiny block formed by the arrangement of a small group of atoms is called the____________?
A. unit cell
B. space lattice
C. either A. or (b)
D. none of the above - On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above - Which of the following is the poorest conductor of electricity ?
A. Carbon
B. Steel
C. Silver
D. Aluminium - Total number of crystal systems is____________?
A. 2
B. 4
C. 7
D. 12 - Due to which of the following factors the brush wear rate is altered ?
A. Speed of the machine
B. Contact pressure
C. Surface conditions of brush and commutator
D. Excessive sparking
E. All of the above - Due to which of the following fact, in India, aluminium is replacing copper ?
A. Aluminium is more ductile and malleable than copper
B. Aluminium is available in plenty, cheaper and lighter than copper
C. Aluminium has lower resistivity than that of copper
D. Aluminium has less temperature co-efficient than copper - is an element used in semiconductors whose atoms have three valence electrons?
A. An acceptor
B. A donor
C. Germanium
D. Silicon
