NEET Physics: Questions 509 - 512 of 2098

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Question number: 509

» Current Electricity » Metre Bridge

MCQ▾

Question

Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged the balance point shifts by

Choices

Choice (4) Response

a.

33.3 cm

b.

50 cm

c.

66.67 cm

d.

25 cm

Question number: 510

» Current Electricity » Potentiometer

MCQ▾

Question

In given figure, the potentiometer wire AB has a resistance of 5 Ω and length 10 m. What is the balancing length AM for the emf of 0.4 V?

Circuit diagram of potentiometer with balance point M

Circuit Diagram of Potentiometer With Balance Point M

Here figure shows the circuit diagram of potentiometer with balance point M. battery of 5V connected with resistor R and a key.

Choices

Choice (4) Response

a.

4 m

b.

0.4 m

c.

8 m

d.

0.8 m

Question number: 511

» Current Electricity » Series and Parallel Combinations of Resistors

MCQ▾

Question

How can we convert the galvanometer of Rg=12Ω and current Ig=3mA into Ammeter with maximum range of 6A.

Choices

Choice (4) Response

a.

By adding a resistance 2.5mΩ in series with the galvanometer

b.

By adding a resistance 6mΩ in series with the galvanometer

c.

By adding a resistance 6mΩ . in parallel with the galvanometer

d.

By adding a resistance 2.5mΩ in parallel with the galvanometer

Question number: 512

» Current Electricity » Resistances of Different Materials

MCQ▾

Question

A heater coil connected to a supply of a 220 F is dissipating some power P 1. The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power P 2. The ratio of power P 1: P 2 is

Choices

Choice (4) Response

a.

1: 4

b.

1: 2

c.

2: 1

d.

4: 1

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