# Electrical Test Questions and Answers

### 41. The example of non-ohmic resistance is

(i) copper wire
(ii) carbon resistance
(iii) aluminium wire
(iv) tungsten wire.

### 42. A copper wire is stretched so that its length is increased by 0.1%. The change in its resistance is

(i) 0.3%
(ii) 0.4%
(iii) 0.2%
(iv) none of the above.

### 43. If an electric current is passed through a nerve, the man

(i) begins to laugh
(ii) begins to weep
(iii) is excited
(iv) becomes insensitive to pain.

(i) silver
(ii) gold
(iii) copper
(iv) zinc.

(i) 1154K
(ii) 1100K
(iii) 1400K
(iv) 1127K

### 46. Ampere – hour is the unit of

(i) quantity of electricity
(ii) strength of current
(iii) power
(iv) energy.

(i) 1 Ω
(ii) 2 Ω
(iii) 3 Ω
(iv) 4 Ω

(i) 0.005/°C
(ii) 0.04/oC
(iii) 0.1/oC
(iv) 0.4/°C

be ..
(i) 0.005/oC
(ii) 0.004/oC
(iii) 0.4/oC
(iv) 0.05/oC

### 50. Referring to Fig. 2, the value of αo is

(i) 1/30 per °C
(ii) 1/40 per °C
(iii) 1/1200 per °C
(iv) none of the above

(i) 70 Ω
(ii) 40 Ω
(iii) 35 Ω
(iv) 50 Ω

### 52. Referring to Fig. 2, the value of α40 will be

(i) 1/30 per °C
(ii) 1/70 per °C
(iii) 1/50 per°C
(iv) 1/1200 per °C

### 53. The value of αo of a conductor is 1/236 per °C. The value of α18 will be

(i) 1/218 per °C
(ii) 1/272 per °C
(iii) 1/254 per °C
(iv) none of the above

## 54. The value of α25 of a conductor is 1/255 per °C. The value of α20 will be

(i) 1/300 per °C
(ii) 1/230 per °C
(iii) 1/250 per °C
(iv) 1/265 per °C

### 55. The value of α50 of a conductor is 1/230 per °C. The value of αo will be

(i) 1/180 per °C
(ii) 1/280 per °C
(iii) 1/250 per °C
(iv) none of the above

(i) 3 x 1022
(ii) 2 x 1026
(iii) 7.2 x 1019
(iv) 7.2 x 1021.

(i) carbon
(ii) constantan
(iii) copper
(iv) silver

### 58. A wire having very high value of conductance is said to be

(i) very good conductor
(ii) moderately good conductor
(iii) insulator
(iv) none of the above

(i) 0.1 Ω
(ii) 20 Ω
(iii) 1/20 Ω
(iv) 200 Ω

(i) 1/9 times
(ii) 3 times
(iii) 9 times
(iv) 1/3 times