Physics Test 68

Result

Physics Test 68

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 watt and 200 watt, in two cases, when first they are joined in series and secondly in parallel, will be :-

A
5/2 , 2/5

B
5/2 , 5/2

C
2/5 , 5/2

D
2/5 , 2/5

Solution

In series P = I²R

In Parellel P = P = V² / R
Question 2
4 / -1

The resistance of a wire is 10Ω. Its length is increased by 10% by stretching. The new resistance will now be :-

A
12Ω

B
1.2Ω

C
13Ω

D
11Ω

Solution

Since R ∝ l² ⇒ If length is increased by 10%, resistance is increases by almost 20%

Hence new resistance R' = 10 + 20% of 10

= 10 + 20/100 × 10 = 12Ω