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A body cools in $10$ minutes from $60 ° C$ to $40 ° C$ . What is the temperature of the body after next $20$ minutes? The temperature of surroundings is $10 ° C$ .

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Important Questions on Thermal Properties of Matter

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 48

Good absorbers of heat are

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 49

A body, which emits radiations of all possible wavelengths, is known as

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 50

Find the heat current flowing through a hollow thick sphere of inner radius

R

and outer radius

2 R

. Thermal conductivity of metal is

K

. Temperature inside sphere is

T_{1}

and outside sphere is

T_{2} \cdot (T_{1} - T_{2} = \frac{10}{π K R})

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 51

A hollow steel sphere, weighing

200 kg

is floating on water. A weight of

10 kg

is to be placed on it in order to submerge when temperature is

20 ° C

. How much less weight (in

kg

) is to be placed when temperature increases to

25 ° C

(γ_{water} = 1.5 \times 10^{- 4} {}^{\circ}C, α_{steel} = 1 \times 10^{- 5} {}^{\circ}C)

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 52

Filament of an incandescent bulb has length

l

and radius of cross-section

r

. Rating of the bulb is (

P

watt,

V

volt). Emissivity of the filament is

ε

and Wien's constant is

b

. Wavelength of the most intense radiation emitted by the filament, if the bulb is operated at half of the rating voltage, is

b {(\frac{n π σ ε r l}{P})}^{\frac{1}{4}}

. Value of

n

, is

(σ =

Stefan's constant)

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 53

Three rods $A B, B C, C A$ are joined to form a triangle $A B C$ . Length of the rods $A B$ and $A C$ each are equal to $b$ and their coefficient of linear expansion is $α_{1}$ whereas length of $rod B C$ is $a$ and its coefficient of linear expansion is $α_{2} .$ Ratio $\frac{b}{a}$ , such that the height $h$ does not change upon heating the rods by same temperature, is $\frac{1}{n} \sqrt{\frac{α_{2}}{α_{1}}}$ . Value of $n$ , is

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 54

A bullet of mass

10 g

moving with speed of

120 m s^{- 1}

hits an ice block of mass

990 g

kept on a frictionless horizontal floor and gets embedded into it. Temperature of ice block is

0 ° C

and its latent heat of fusion is

80

calorie/gram. If

{(\frac{3}{4})}^{t h}

of the energy lost in collision is used into heating the ice, mass of ice melted (in

g

) is

[1 cal = 4.2 J]

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Gamma Question Bank for Engineering Physics>Chapter 10 - Thermal Properties of Matter>Assignment>Q 55

A cup of coffee cools down from

54 ° C

45 ° C

5

minute. How much further time in minutes it will take to cool down to

36 ° C

, if the room temperature is

18 ° C

A body cools in 10 minutes from 60°C to 40°C. What is the temperature of the body after next 20 minutes? The temperature of surroundings is 10°C.

Important Questions on Thermal Properties of Matter

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A body cools in $10$ minutes from $60 ° C$ to $40 ° C$ . What is the temperature of the body after next $20$ minutes? The temperature of surroundings is $10 ° C$ .