Physics Test 7

Result

Physics Test 7

Score
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Weekly Quiz Competition

Question 1
4 / -1

Which of the following can cause the null point of a potentiometer to shift beyond the wire?

A
Shorter length of wire

B
Longer length of wire

C
Low emf of auxiliary battery

D
High emf of auxiliary battery

Solution

Null point of a potentiometer can shift beyond the wire if the potential gradient along the potentiometer wire decreases, which is possible by having low emf auxiliary battery
Question 2
4 / -1

A thermodynamical systems is changed from state (P₁, V₁) to (P₂, V₂) by two different process, the quantity which will remain same will be

A
ΔQ

B
ΔW

C
ΔQ + ΔW

D
ΔQ - ΔW

Solution

For all processes, change in internal energy ΔU =(ΔQ - ΔW) does not change. It depends only on initial and final states.
Hence, option D is correct.