# GATE (Graduate Aptitude Test in Engineering) Physics: Questions 644 - 648 of 659

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## Question 644

Appeared in Year: 2017

### Describe in Detail

Essay▾

The best resolution that a bit A/D convertor with full scale can achieve is . (up to two decimal places) .

### Explanation

Here, the full-scale voltage is,

And number of bit is,

Now, the best resolution of bit A/D converter with full scale is given as,

## Question 645

Appeared in Year: 2017

### Question

MCQ▾

Consider non – interacting, distinguishable particles in a two level system at temperature . The energies of the levels are and , where . In the high temperature limit , what is the population of particle in the level with energy ?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 646

Appeared in Year: 2017

### Question

MCQ▾

Electromagnetic interactions are:

### Choices

Choice (4)Response

a.

non – conserving but conserving

b.

non – conserving

c.

non – conserving but conserving

d.

conserving

## Question 647

Appeared in Year: 2017

### Question

MCQ▾

A reversible Carnot engine is operated between temperature and with a photon gas as the working substance. The efficiency of the engine is:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 648

Appeared in Year: 2017

### Describe in Detail

Essay▾

Consider an ideal operational amplifier as shown in the figure below with . For an applied input voltage , the current passing through is . (up to two decimal places) .

### Explanation

Here, the given circuit is the circuit of an op – amp with negative feedback (a non – inverting amplifier) . The input signal appears at both positive and negative terminals, resulting in a current through equal to,

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