Silicon and germanium atoms combine orderly into array of atoms located in repet

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Question
Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called
Options
A. crystal
B. covalent bond
C. molecule
D. valence bond

Correct Answer

crystal

Materials and Components problems

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3. When a material becomes a superconductor, its resistivity becomes
Options
A. very small
B. zero
C. about 10% of normal value
D. about 20% of normal value

4. As the temperature of a pure silicon specimen is increased
Options
A. the number of free electrons increases
B. the number of holes decreases
C. the number of holes increases
D. the number of free electrons and holes increases

5. Match the following:

	List I (type of controller)		List II (Operation)
A.	Pneumatic controller	1.	Flexible operation
B.	Hydraulic controller	2.	High torque high speed operation
C.	Electronic controller	3.	Fire and explosion proof operation

Options
A. A-1, B-3, C-2
B. A-1, B-2, C-3
C. A-3, B-1, C-2
D. A-3, B-2, C-1

8. Assertion (A): In many materials, dielectric polarization causes mechanical distortion.
Reason (R): If dielectric polarization causes mechanical distortion then mechanical distortion must cause dielectric polarization.
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

9. Consider the following statement
If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is
1. both due to electrons and holes with electrons as majority carriers
2. sum of hole and electron currents
3. difference between electron and hole currents.
Which of above statements are correct?
Options
A. 1 only
B. 1 and 2
C. 2 only
D. 3 only

10. Assertion (A): ?_r can be determined experimentally by measuring the capacitance of a parallel plate capacitor with and without the dielectric.
Reason (R): Capacitance of a parallel plate capacitor = .
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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