Energy needed to magnetize and demagnetize is represented by _________________? April 17, 2025 by admin A. Hysteresis curve B. Hysteresis loop area C. Hysteresis loop D. Straight line
What is the SI unit of modulus of elasticity of substance ? April 17, 2025 by admin A. Nm-2 B. Jm-2 C. Nm-1 D. Being a number it has no unit.
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ? April 17, 2025 by admin A. 2×108 Nm-2 B. 5×106 Nm-2 C. 0.5×10-6 Nm-2 D. 0.2×10-6Nm-2
A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________? April 17, 2025 by admin A. 0.025J B. 0.50J C. 0.75J D. 0.100J
Materials that undergo plastic deformation before breaking are called __________________? April 17, 2025 by admin A. Brittle B. Ductile C. Amorphous D. Polymers
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________? April 17, 2025 by admin A. (F1+F2) (121+122) B. (F1+F2) (122-112) C. (F1+F2) (12-11) D. (F1+F2) (12-11)
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________? April 17, 2025 by admin A. Stiffness B. Toughness C. Extension D. Deformation
The curie temperature is that at which ____________________? April 17, 2025 by admin A. Semi-conductor becomes conductors B. Ferromagnetic becomes paramagnetic C. Paramagnetic becomes diamagnetic D. Metals become super conductor
Coercive force is the force which opposes ____________________? April 17, 2025 by admin A. Demagnetization B. Breakage C. Extension D. Surface cracking
The bulk properties of materials such as their mode of fracture can be related to their____________________? April 17, 2025 by admin A. Polymerization B. Cleavage C. Microstructure D. Dislocation
