ٹھوسوں کی طبیعیات

Stress is defined as:

• 1 Area / force
• 2 Force x area
• 3 Force per unit area
• 4 Extension per unit length

Young's modulus is the ratio of:

• 1 Stress to strain
• 2 Length to mass
• 3 Force to area
• 4 Strain to stress

The energy gap between the valence and conduction bands is largest in:

• 1 Conductors
• 2 Semiconductors
• 3 Superconductors
• 4 Insulators

The resistance of a semiconductor generally with rising temperature:

• 1 Decreases
• 2 Becomes infinite
• 3 Stays constant
• 4 Increases

A material that loses its resistance below a critical temperature is a:

• 1 Superconductor
• 2 Dielectric
• 3 Insulator
• 4 Semiconductor

The resistance of a metal generally increases with:

• 1 Cooling
• 2 Temperature
• 3 Pressure only
• 4 Dimming

A p type semiconductor is formed by adding:

• 1 Insulators
• 2 Acceptor impurities
• 3 Donor impurities
• 4 Metals

The elastic limit is the maximum stress up to which a material:

• 1 Breaks
• 2 Becomes magnetic
• 3 Returns to its original shape
• 4 Melts