electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

electric current and magnetism PRACTICE TEST [9 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

Question : 26

In an intrinsic semiconductor

a) both holes and electrons carry current

b) both holes and electrons carry current with electrons being majority carriers

c) only electrons are responsible for flow of current

d) only holes are responsible for flow of current

Answer: (a)

Question : 27

Conductivity increases in the order of

a) Al, Cu, Ag

b) Cu, Al, Ag

c) Al, Ag, Cu

d) Ag, Cu, Al

Answer: (a)

Silver is the best conductor of electricity.

Question : 28

Match the Column - I and Column - II.

Column I Column II
A. Myopia 1. Convex lens
B. Hypermetropia 2. Concave lens
C. Presbyopia 3. Cylindrical lens
D. Astigmatism 4. Bifocal Lens
Select the correct answer using the codes given below the lists:

a) A-Q; B-P; C-S; D-R

b) A-P; B-Q; C-S; D-R

c) A-P; B-Q; C-R; D-S

d) A-Q; B-P; C-R; D-S

Answer: (a)

Question : 29

The forbidden gap in the energy bands of germanium at room temperature is about

a) 0.1 eV

b) 0.67 eV

c) 1.1 eV

d) 6.7 eV

Answer: (b)

Δ$E_{g(Germanium)}$ = 0.67 eV.

Question : 30 [IAS (Pre) 1999]

Consider the following statements regarding a motor car battery.

  1. The voltage is usually 12V.
  2. Electrolyte used is hydrochloric acid.
  3. Electrodes are lead and copper.
  4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?

a) 3 and 4

b) 1 and 2

c) 2 and 3

d) 1 and 4

Answer: (d)

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