# NEET Physics: Questions 1168 - 1172 of 2142

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## Question number: 1168

MCQ▾

### Question

A photon and an electron have equal energy E. is proportional to

### Choices

Choice (4) Response

a.

b.

c.

d.

Not depend upon E

## Question number: 1169

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

### Question

The latent heat of vaporization of water is 2240 J/gm. If the work done in the process of expansion of 1 g of water is 168 J, then increase in internal energy is

### Choices

Choice (4) Response

a.

1904 J

b.

2072 J

c.

2240 J

d.

2408 J

## Question number: 1170

MCQ▾

### Question

2 kg of ice at - 20°C is mixed with 5 kg of water at 20°C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/°C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg

### Choices

Choice (4) Response

a.

4 kg

b.

7 kg

c.

2kg

d.

6 kg

## Question number: 1171

MCQ▾

### Question

The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those X-rays which can be diffracted by this crystal is-

(1) 5 Å (2) 10 Å

(3) 20 Å (4) 25 Å

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

## Question number: 1172

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

### Question

An ice box used for keeping eatable cold has a total wall, area of 1 meter 2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/meter °C is filled with ice at 0° C along with eatables on a day when the temperature is 30°C. The latent heat of fusion of ice is 334 × 10 3 joules/kg. The amount of ice melted in one day is (1 day = 86, 400 seconds)

### Choices

Choice (4) Response

a.

1552 gm

b.

776 gm

c.

11520 gm

d.

7760 gm

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