Assertion (A): Magnetism can be explained by the theory of magnetic domains. Rea

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Question
Assertion (A): Magnetism can be explained by the theory of magnetic domains.
Reason (R): The existence of magnetic domains is evident from the Bitter powder patterns.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Correct Answer

Both A and R are true but R is not correct explanation of A

Materials and Components problems

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1. Assertion (A): Silicon is the most favoured semiconductor material.
Reason (R): PIV for silicon diode is more than that for germanium diode.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

2. Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.
Reason (R): Thermionic emission current ? T² e^-Ew/kT.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

3. The temperature below which certain materials are antiferromagnetic and above which they are paramagnetic is called
Options
A. Weiss temperature
B. Curie temperature
C. Neel temperature
D. None of the above

4. Assertion (A): If W_F is Fermi energy, v is velocity of electron and m is mass of electron, then .
Reason (R): Conductivity of a metal depends on temperature and impurity concentration.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. For a photoconductor with equal electron and hole mobilities and perfect ohmic contacts at the ends, an increase in intensity of optical illumination results in
Options
A. a change in o.c voltage
B. a change in s.c current
C. decrease in resistance
D. increase in resistance

8. In a piezoelectric crystal, the application of mechanical force will cause
Options
A. plastic deformation of crystal
B. magnetic dipoles in the crystal
C. electrical polarization in the crystal
D. shift in Fermi level

9. A piece of iron is placed in a magnetic field
Options
A. the magnetic field will not be affected
B. the magnetic lines of force will bend to pass through the piece
C. the magnetic lines of force will bend away from the piece
D. any of the above depending on type of iron

10. Assertion (A): If difference between static and optical dielectric constant is high, the mechanical compressiblity of that material is also high.
Reason (R): For soft ions, ionic polarization per unit field is higher than that of hard ions.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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