# Electrical Test Questions and Answers

(i) 109 V
(ii) 50 V
(iii) 150 V
(iv) 200 V

### 62. A resistor R1 dissipates the power P when connected to a certain generator. If resistance R2 is put in series with R1, the power dissipated by R1

(i) decreases
(ii) increases
(iii) remains the same
(iv) any of the above depending upon the values of R1 and R2

### 63. In case of liquids, ohm’s law is

(i) fully obeyed
(ii) partially obeyed
(iii) there is no relation between current and p.d.
(iv) none of the above

(i) R1 = 2R2
(ii) R2 = 2R1
(iii) R2 = 4 R1

(i) 10 Ω
(ii) 12.1 Ω
(iii) 9 Ω
(iv) 11 Ω

### 66. The current-voltage graphs for a given metallic wire at two different temperatures T1, and T2 are shown in Fig. 3. Then

(i) T2 > T1
(ii) T2 < T1
(iii) T1 = T2
(iv) none of the above

(i) 16A
(ii) 1.6 A
(iii) 160 A
(iv) 1 A

### 68. No current flows between two charged bodies if they have same

(i) capacity
(ii) potential
(iii) charge
(iv) none of the above

(i) 4 Ω
(ii) 0.5 Ω
(iii) 1.2 Ω
(iv) 0.121 Ω

### 70. The specific resistance of a wire 1.1 m long, 0.4 mm diameter having a resistance of 4.2 Ω will be

(i) 48 x 10-8 Ωm
(ii) 40 x 108 Ωm
(iii) 4 x 10-6 Ωm
(iv) none of the above

(i) manganin
(ii) constantan
(iii) copper
(iv) nichrome

### 72. The specific resistance of the material of wire depends on

(i) the area of cross-section
(ii) length
(iii) mass
(iv) none of the above

(i) power
(ii) energy
(iii) e.m.f.
(iv) charge

### 75. What will be the resistance value corresponding to colour code yellow, violet, orange, silver ?

(i) 47 kΩ ± 10%
(ii) 4.7 kΩ ± 20 %
(iii) 2 kΩ ± 10%
(iv) none of the above

### 76. What will be the resistance value corresponding to colour code brown, black, red ?

(i) 2 kΩ ± 10%
(ii) 1 kΩ ± 20 %
(iii) 7 kΩ ± 20 %
(iv) none of the above

### 77. Two resistors A and B have resistances RA and RB respectively with RA < RB. The resistivities of their materials are ρA and ρB. Then

(i) ρA > ρB
(ii) ρA = ρB
(iii) ρA < ρB
(iv) Information insufficient

### 78. As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity

(i) increases
(ii) decreases
(iii) remains constant
(iv) may increase or decrease

(i) 10 Ω
(ii) 20 Ω
(iii) 5 Ω
(iv) 40 Ω

### 80. An electron moves in a circle of radius 10 cm with a constant speed of 4 x 106 ms-1. The electric current at a point on the circle is

(i) 1 x 10-12A
(ii) 4 x 10-7A
(iii) 2 x 10-6A
(iv) none of above

(i) 200 Ω
(ii) 10 Ω
(iii) 1000 Ω
(iv) 25 Ω

### 83. The hot resistance of electric bulb’s filament is higher than its cold resistance because the temperature co-efficient of filament is

(i) zero
(ii) positive
(iii) negative
(iv) none of above

(i) 80m
(ii) 40m
(iii) 20m
(iv) 24m

### 85. When 1 V is applied in a circuit a current of 1 µA flows through it. The conductance of the circuit is

(i) 1 µ mho
(ii) 106 mho
(iii) 2 µ mho
(iv) none of above