A characteristic property of crystal is its periodicity of structure. True False

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Question
A characteristic property of crystal is its periodicity of structure.
Options
A. True
B. False

Correct Answer

True

More questions

2. A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 10⁴ V/m. If the space between the plates is filled with a material having ?_r = 10, then the value of field in the dielectric will be
Options
A. 2 x 10³ V/m
B. x 10⁴ V/m
C. 210 x 10⁴ V/m
D. 2 x 10⁵ V/m

3. Match the following:

	List I		List II
A.	? x = 0	1.	irrotational vector
B.	? . = 0	2.	conservative field
C.	? .dl = 0	3.	solenoidal vector

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

4. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.
Reason (R): A semi converter is cheaper than a full converter.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

5. Match the following:

	List I		List II
A.		1.	v(t) = u(t + 1)
B.		2.	v(t) = u(t) - 2u(t - 1) + 2u(t - 2) - 2u(t - 3)....
C.		3.	v(t) = u(t - 1) - u(t - 3)
D.		4.	v(t) = ?(t - 1)

Options
A. A-3, B-4, C-2, D-1
B. A-3, B-4, C-1, D-2
C. A-4, B-3, C-2, D-1
D. A-4, B-3, C-1, D-2

6. Match the following:

	List I		List II
A.	True type	1.	Type of calculator in window
B.	FIND	2.	Window command
C.	WORD PAD	3.	Name of a Font
D.	STANDARD	4.	Has many features of a simple word processor

Options
A. A-1, B-2, C-3, D-4
B. A-4, B-3, C-2, D-1
C. A-3, B-2, C-1, D-4
D. A-3, B-2, C-4, D-1

8. A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45�, the speed is likely to be
Options
A. about 350 rpm
B. about 250 rpm
C. about 175 rpm
D. about 125 rpm

9. Which of the following pairs are correctly matched?
1. Brune's realisation : realisation with ideal transformer.
2. Cauer realisation : ladder realisation.
3. Bott Duffin realisation : with non ideal transformer.
Select the answer using the following codes:
Options
A. 1, 2 and 3
B. 2 and 3
C. 1 and 3
D. 1 and 2

10. In controlled heating circuits, thyristors act as
Options
A. rectifier
B. inverter
C. ac regulator
D. chopper

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