# Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 27 - 30 of 190

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## Question number: 27

» Properties of Solids & Liquids » Thermal Expansion

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: 28

» 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

## Question number: 29

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

### Question

f between wavelength λ and λ + dλ, e λ and a λ be the emissive and absorptive powers of a body and E λ be the emissive power of a perfectly black body, then according to Kirchhoff’s law, which is true

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

### Question

The ratio of radii of two wires of same material is 2: 1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be

### Choices

Choice (4) Response

a.

4: 1

b.

1: 2

c.

2: 1

d.

1: 4