Assertion (A): Atomic number of sodium is 11. Reason (R): Sodium has a body cent

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Question
Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.
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

Explanation

Atomic number is not dependent on lattice structure.

Materials and Components problems

Search Results

1. At room temperature, the current in intrinsic semiconductor is due to
Options
A. holes
B. electrons
C. ions
D. holes and electrons

2. Ferroelectric materials are those which
Options
A. cannot be polarized
B. have a permanent polarization
C. have a_e equal to zero
D. have ?_p = 0

3. The apparent capacitance at a high angular frequency ? of an air cored capacitor having capacitance C and inductance L is given by
Options
A.
B.
C.
D.

4. In paramagnetic materials
Options
A. permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B. permanent magnetic dipole do not exist
C. permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D. permanent magnetic dipole moment may or may not exist

5. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
Options
A. True
B. False

6. Which of the following are donor impurities?
1. Gold
2. Phosphorus
3. Boron
4. Antimony
5. Arsenic
6. Induim
Select the correct answer using the following codes
Options
A. 1, 2, 3
B. 1, 2, 4, 6
C. 3, 4, 5, 6
D. 2, 4, 5

7. Assertion (A): Power loss in a conductor of resistance P = I²R.
Reason (R): When a conductor is carrying current with current density J as a result of applied field E, then heat developed/m³/ second = JE.
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

8. When an electric field E is applied to solid and liquid insulating materials, the internal field E_i acting at the location of atom is such that
Options
A. E_i = E
B. E_i > E
C. E_i < E
D. E_i may be equal to or less than E

9. The number of valence electrons in donor impurity are
Options
A. 5
B. 4
C. 3
D. 1

10. Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90�.
Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ?^'_r - j?^"_r.
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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