Current Electricity Test

Result

Current Electricity Test - 120

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Weekly Quiz Competition

Question 1
4 / -1

Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,

A
B draws more current than A

B
currents drawn are in the ratio of their resistances

C
both draw the same current

D
A draws more current than B

Solution
Question 2
4 / -1

A 5.0 A current is set up in an external circuit by a 6.0 V storage battery for 6.0 min. The chemical energy of the battery is reduced by

A
1.08 × 10⁴ J

B
1.08 × 10³ J

C
1.8 × 10⁴ J

D
1.8 × 10³ J

Solution
Question 3
4 / -1

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp, when not in use ?

A
40 Ω

B
20 Ω

C
400 Ω

D
200 Ω

Solution
Question 4
4 / -1

Two bulbs X and Y having same voltage rating and of power 40 W and 60 W respectively are connected in series across a potential difference of 300 V, then

A
X will glow brighter

B
resistance of Y. will be greater than X

C
heat produced in Y will be greater than X

D
voltage drop in X will be greater than Y

Solution
Question 5
4 / -1

Two bulbs (25 W – 220 V) and (100 W – 220 V) are given. Which has higher resistance?

A
25 W bulb

B
100 W bulb

C
Both bulbs will have equal resistance

D
Resistance of bulbs cannot be compared

Solution
Question 6
4 / -1

A coil takes 15 min to boil a certain amount of water, another coil takes 20 mm for the same process, Time taken to boil the same amount of water when both coils are connected in series

A
5 min

B
8.6 min

C
35 min

D
30 min

Solution
Question 7
4 / -1

A
200°C

B
400°C

C
-200°C

D
-100°C

Solution
Question 8
4 / -1

If a current is allowed to pass through a circuit consisting of two dissimilar metals, there is either evolution or absorption of heat at the junction, depending upon the direction of the current. The effect is known as

A
Seebeck effect

B
Joule effect

C
Peltier effect

D
Thomson effect
Question 9
4 / -1

The thermo emf of a thermocouple is 25µV/°C at room temperature. A galvanometer of 40 Ω resistance capable of detecting current as low as 10^-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

A
16° C

B
12° C

C
8° C

D
20° C

Solution
Question 10
4 / -1

If the cold junction of a thermocouple is kept at 0°C and the hot junction is kept at T°C, then the relation between neutral temperature (T_n) and temperature of inversion (T_i) is

A

B
T_n = 2T_i

C
T_n = T_i - T

D
T_n = T_i + T

Solution