Physics Test 36

Result

Physics Test 36

Score
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Rank
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TIME Taken - -

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Question 1
4 / -1

If a = 8 ± 0.08 and b = 6 ± 0.06, Let x = a + b, y = a – b, z = a×b. The correct order of % error in x,y and z

A
x = y < z

B
x = y > z

C
x < z < y

D
x > z < y

Solution

a + b = 14 ± 0.14 ⇒ % error = 0.14/14 × 100 = 1%

a – b = 2 ± 0.14 ⇒ % error = 0.14/2 × 100 = 7%

a × b = 48 ± 0.96 ⇒ % error = 0.98/48 × 100 = 2%

so, order of % error x < z < y
Question 2
4 / -1

On heating one end of a rod, the temperature of whole rod will be uniform when :-

A
K = 1

B
K = 0

C
K = 100

D
K = ∞

Solution

For uniform temperature on heating the rod, K should be infinite.