Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): Rochelle salt and Barium titanate are both ferroelectric.

Reason (R): Ferroelectric materials exhibit hysteresis effect.

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
Answer: B

Both the materials exhibit ferroelectric properties. Hysteresis effect is one of the features of ferroelectric materials.

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The direction of force an a conductor carrying current and lying in a magnetic field can be found by using
A:
Fleming's left hand rule
B:
Fleming's right hand rule
C:
Cork screw rule
D:
Any of the above
Answer: A
No answer description is available. Let's discuss.
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A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of
A:
copper decreases and germanium increases
B:
both decreases
C:
both increases
D:
copper increases and germanium decreases
Answer: A

As temperature is decreased, resistance of conductors decreases and resistance of semiconductors increases.

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Diamagnetic materials do not have permanent magnetic dipoles.
A:
True
B:
False
C:
D:
Answer: A
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The wavelength of light emitted by GaAs laser is 8670 x 10-10 m. If h = 6.626 x 10-34 Js, velocity of light = 3 x 108 m/s and eV = 1.602 x 10-19 J, the energy gap in GaAs is
A:
0.18 eV
B:
0.7 eV
C:
1.43 eV
D:
2.39 eV
Answer: C
No answer description is available. Let's discuss.
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