Options:
- A. 0.025J
- B. 0.50J
- C. 0.75J
- D. 0.100J
View Answer
C. 0.75J
Physics
What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
Options:
- A. 1A
- B. 10A
- C. 100A
- D. 1000A
View Answer
C. 100A
Materials that undergo plastic deformation before breaking are called __________________?
Options:
- A. Brittle
- B. Ductile
- C. Amorphous
- D. Polymers
View Answer
B. Ductile
Two parallel wires carrying currents in the opposite directions____________________?
Options:
- A. repel each other
- B. attract each other
- C. have no effect upon each other
- D. they cancel out their individual magnetic fields
View Answer
A. repel each other
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____________________?
Options:
- A. (F1+F2) (121+122)
- B. (F1+F2) (122-112)
- C. (F1+F2) (12-11)
- D. (F1+F2) (12-11)
View Answer
C. (F1+F2) (12-11)
A magnetic field___________________?
Options:
- A. always exerts a force on a charged particle
- B. never exerts a force on a charged particles
- C. exerts a force if the charged particle is moving in the direction of the magnetic field lines
- D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
View Answer
D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
Options:
- A. Stiffness
- B. Toughness
- C. Extension
- D. Deformation
View Answer
D. Deformation
Which one of the following material is most suitable for making core of an electromagnet ?
Options:
- A. air
- B. steel
- C. Cu-Ni alloy
- D. soft iron
View Answer
D. soft iron
The curie temperature is that at which ____________________?
Options:
- A. Semi-conductor becomes conductors
- B. Ferromagnetic becomes paramagnetic
- C. Paramagnetic becomes diamagnetic
- D. Metals become super conductor
View Answer
B. Ferromagnetic becomes paramagnetic
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
Options:
- A. 1T = 103 G
- B. 1T = 10-4 G
- C. 1T = 10-2 G
- D. 1T = 104 G
View Answer
D. 1T = 104 G