# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1213 - 1217 of 2184

Access detailed explanations (illustrated with images and videos) to 2184 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Subscription can be renewed yearly absolutely FREE! View Sample Explanation or View Features.

Rs. 550.00 or

How to register?

## Question number: 1213

Edit
MCQ▾

### Question

A wire of cross sectional area 4mm 2 is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion a = 10 -5 /°C and Y = 2 × 10 11 N/m 2.

### Choices

Choice (4) Response

a.

220 N

b.

160 N

c.

120 N

d.

120 KN

## Question number: 1214

Edit
MCQ▾

### Question

The intensity of the light coming from one of the slits in a young’s double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.

### Choices

Choice (4) Response

a.

16: 1

b.

9: 1

c.

34: 1

d.

4: 1

## Question number: 1215

Edit
MCQ▾

### Question

When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semi-angular width of central maximum of diffraction pattern will be

### Choices

Choice (4) Response

a.

30°

b.

90°

c.

60°

d.

## Question number: 1216

» Properties of Solids & Liquids » Heat Transfer » Conduction

Edit
MCQ▾

### Question

A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends is 30°C. Then the difference of temperature at the two surfaces of A will be

### Choices

Choice (4) Response

a.

24°C

b.

12°C

c.

18°C

d.

10°C

## Question number: 1217

Edit
MCQ▾

### Question

A film of water is formed between two straight parallel wires of length 15 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 -2 N/m)

### Choices

Choice (4) Response

a.

7.22 × 10 -6 Joule

b.

2.16 × 10 -5 Joule

c.

1.44 × 10 -5 Joule

d.

5.76 × 10 -5 Joule