Physics Mcqs Archives | Page 17 of 85

Identify the correct statement about minority carriers_____________?

August 30, 2021March 22, 2019 by admin

Identify the correct statement about minority carriers_____________?

A. holes in n-type and free electrons in p-type
B. holes in n-type and p-type
C. free electrons in n-type and holes in p-type
D. free electrons in n-type and p-type

In n-p-n transistor, p works as______________?

August 30, 2021March 22, 2019 by admin

In n-p-n transistor, p works as______________?

A. collector
B. emitter
C. base
D. any of above

p-n junction when reversed biased acts as a_______________?

August 30, 2021March 22, 2019 by admin

p-n junction when reversed biased acts as a_______________?

A. capacitor
B. inductor
C. on switch
D. off switch

Semi-conductor germanium and silicon are_________________?

August 30, 2021March 22, 2019 by admin

Semi-conductor germanium and silicon are_________________?

A. pentavalent
B. trivalent
C. divalent
D. tetravalent

Electrons present in p-type material due to thermal pair generation are_____________?

August 30, 2021March 22, 2019 by admin

Electrons present in p-type material due to thermal pair generation are_____________?

A. majority carriers
B. minority carriers
C. dual carriers
D. blockers

The velocity of laser light is___________________?

August 30, 2021March 22, 2019 by admin

The velocity of laser light is___________________?

A. Less than ordinary light
B. More than ordinary light
C. Equal to ordinary light
D. Different for different colours or frequency

Reflecting mirrors in laser is used to______________?

August 30, 2021March 22, 2019 by admin

Reflecting mirrors in laser is used to______________?

A. Further stimulation
B. Lasing more
C. For producing more energetic lasers
D. All

In He-Ne laser the lasing action is produced by_______________?

August 30, 2021March 22, 2019 by admin

In He-Ne laser the lasing action is produced by_______________?

A. Ne only
B. He-Ne both
C. Electrons of He
D. Electrons Ne

The metastable state for an atom in laser light is_____________?

August 30, 2021March 22, 2019 by admin

The metastable state for an atom in laser light is_____________?

A. 10-4 sec
B. 10-5 sec
C. 10-3 sec
D. 10-8 sec

In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

August 30, 2021March 22, 2019 by admin

In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

A. Metal stable state
B. Normal state
C. Inverted population
D. All the above