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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
11.
The direction of force an a conductor carrying current and lying in a magnetic field can be found by using
Fleming's left hand rule
Fleming's right hand rule
Cork screw rule
Any of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.

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

Reason (R): Ferroelectric materials exhibit hysteresis effect.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

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

13.
The units for electric dipole moment are
coulombs
colomb-metre
coulomb/metre
coulomb/m2
Answer: Option
Explanation:

It is product of charge and distance.

14.
The temperature coefficient of resistivity of semiconductors is
positive
negative
may be positive or negative
very low
Answer: Option
Explanation:

Resistance of semiconductors decreases with increase in temperature.

15.
Which of the following is used in automatic control of street lights?
Thermistor
Photoconductor
Transistor
Varistor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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