NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 13

EASY

12th ICSE

IMPORTANT

Earn 100

Why is a potentiometer preferred over a voltmeter in measuring the emf of a cell?

Important Questions on DC Circuits and Measurements

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 14

A

10 m

long potentiometer wire carries a steady current. A standard cell of emf

1.018 V

is balanced against a length of

254.5 cm

of the wire. What is the potential gradient across the potentiometer wire?

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 15

In a potentiometer experiment, balancing length is found to be

120 cm

for a cell

E_{1}

of emf

2 V

What will be the balancing length for another cell

E_{2}

of emf

1.5 V

? (No other changes are made in the experiment).

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 16

Name the device used for measuring the internal resistance of a secondary cell.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 17

The figure show parts of electrical circuits. Compute $I$ in each case.

Question Image

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 17

The figure show parts of electrical circuits. Compute $I$ in each case.

Question Image

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 18

A wire of uniform cross-section and length

l

has a resistance of

16 Ω

. It is cut into four equal parts. Each part is stretched uniformly to length / and all the four stretched parts are connected in parallel. Calculate the total resistance of this combination.

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 19

A

4 Ω

resistance wire is bent in the form of a circle. Find the effective resistance between the ends of a diameter.

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 6 - DC Circuits and Measurements>QUESTIONS>Q 20

The figure shows the variation of potential difference $V$ with length $l$ of the wire for two potentiometers $X$ and $Y$ . Which one will you prefer for comparing emfs of two cells and why?

Question Image