NEET Questions - Physics - Thermal Properties of Matter

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Question bank:

One kilogram of ice at $0 °$ C is mixed with one kilogram of water at 80 $° C$ . The final temperature of the mixture is (Take: Specific heat of water = 4200 J $k g^{- 1} k^{- 1}$ , Latent heat of ice = 336 kJ $k g^{- 1}$ )

0 °

50 ° C

40 ° C

60 ° C

The fastest mode of heat transfer is

Conduction
Radiation
Convection
all are equally fast

$A temperature of 100 ° F (Farenhiet scale) is equal to T K (Kelvin scale) . The value of T is$

310.9
37.8
100
122.4

A black body at temperature 300K radiates heat at the rate E. If its temperature is increased by 600K, the rate of radiation will increase to -

16E
64E
81E
256E

$A body cools down from 80 ° C to 70 ° C in 5 minutes . the temperature of the body will fall from 70 ° C to 60 ° C in a time$

Less than 5 minutes
equal to 5 minutes
More than 5 minutes
Can't say anything like the temperature of surrounding is not known

Heat capacity is equal to the product of:

mass and gas constant
mass and specific heat
latent heat and volume of water
mass and Avogadro number

When a block of iron floats in Hg at $0 ° C$ , a fraction $K_{1}$ of its volumen= is submerged, while at temperature of $60 ° C$ a fraction $K_{2}$ is seen to be submersed. If the coefficient of volume expansion of iron is $γ_{F e}$ and that of mercury is $γ_{H g}$ , then the ratio $\frac{K_{1}}{K_{2}}$ can be expressed as:

\frac{1 + 60 γ_{F e}}{1 + 60 γ_{H g}}

\frac{1 - 60 γ_{F e}}{1 + 60 γ_{H g}}

\frac{1 + 60 γ_{F e}}{1 - 60 γ_{H g}}

\frac{1 + 60 γ_{H e}}{1 - 60 γ_{F e}}

Hot water cools from 60 $° C$ to 50 $° C$ in first 10 minutes and from 50 $° C$ to 42 $° C$ in next 10 minutes. The temperature of surrounding is :

5 ° C

10 ° C

15 ° C

20 ° C

$If α_{c} and α_{f} denote the numerical values of coefficient of linear expansion of a solid, expressed per ° C and per ° F respectively, then$

α_{c} > α_{f}

α_{f} > α_{c}

α_{f} = α_{c}

α_{f} + α_{c} = 0

$A pendulum clock runs fast by 5 \sec . per day at 20 ° C and goes slow by 10 \sec . per day at 35 ° C . It shows correct time at a temperature of$

27.5 ° C

25 ° C

30 ° C

33 ° C

A constrained steel rod of length l, area of cross-section A Young's modulus Y and coefficient of linear expansion $α$ is heated through $t ° C$ . The work that can be performed by the rod when heated is

(YA

α

t)(l

α

\frac{1}{2}

(YA

α

t)(l

α

\frac{1}{2}

(YA

α

\frac{1}{2}

α

t)
2(YA

α

t)(l

α

A spherical black body with a radius of 12cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be:

225
450
1000
1800

Two identical bodies are made of a material for which the heat capacity increases with temperature.One of these is at $100^{°}$ C,while the other one is at $0^{°}$ C. If the two bodies are brought into contact, then assuming no heat loss,the final common temperature is -

50^{°} C

more than

50^{°}

C
less than

50^{°}

C but greater than

0^{°}

0 {}_{0}C

A body cools from a temperature 3T to 2T in10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be -

\frac{7}{4} T

\frac{3}{2} T

\frac{4}{3} T

T

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U₁, at wavelength 500nm is U₂ and that at 1000nm is U₃ . Given Wien's constant $b = 2.88 \times 10^{6} n m - K$ . Which of the following is correct?

U₃=0
U₁>U₂
U₂>U₁
U₁=0

NEET Physics Questions: Thermal Properties of Matter

Question bank:

One kilogram of ice at 0°C is mixed with one kilogram of water at 80°C. The final temperature of the mixture is (Take: Specific heat of water = 4200 J kg-1k-1, Latent heat of ice = 336 kJ kg-1)

The fastest mode of heat transfer is

A temperature of 100°F Farenhiet scale is equal to T K Kelvin scale. The value of T is

A black body at temperature 300K radiates heat at the rate E. If its temperature is increased by 600K, the rate of radiation will increase to -

A body cools down from 80°C to 70°C in 5 minutes. the temperature of the body will fall from 70°C to 60°C in a time

Heat capacity is equal to the product of:

When a block of iron floats in Hg at 0°C, a fraction K1 of its volumen= is submerged, while at temperature of 60°C a fraction K2 is seen to be submersed. If the coefficient of volume expansion of iron is γFe and that of mercury is γHg, then the ratio K1K2 can be expressed as:

Hot water cools from 60°C to 50°C in first 10 minutes and from 50°C to 42°C in next 10 minutes. The temperature of surrounding is :

If αc and αf denote the numerical values of coefficient of linear expansion of a solid, expressed per °C and per °F respectively, then

A pendulum clock runs fast by 5 sec. per day at 20°C and goes slow by 10 sec. per day at 35°C. It shows correct time at a temperature of

A constrained steel rod of length l, area of cross-section A Young's modulus Y and coefficient of linear expansion α is heated through t°C. The work that can be performed by the rod when heated is

A spherical black body with a radius of 12cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be:

Two identical bodies are made of a material for which the heat capacity increases with temperature.One of these is at 100° C,while the other one is at 0° C. If the two bodies are brought into contact, then assuming no heat loss,the final common temperature is -

A body cools from a temperature 3T to 2T in10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be -

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500nm is U2 and that at 1000nm is U3 . Given Wien's constant b=2.88×106 nm-K. Which of the following is correct?

One kilogram of ice at $0 °$ C is mixed with one kilogram of water at 80 $° C$ . The final temperature of the mixture is (Take: Specific heat of water = 4200 J $k g^{- 1} k^{- 1}$ , Latent heat of ice = 336 kJ $k g^{- 1}$ )

$A temperature of 100 ° F (Farenhiet scale) is equal to T K (Kelvin scale) . The value of T is$

$A body cools down from 80 ° C to 70 ° C in 5 minutes . the temperature of the body will fall from 70 ° C to 60 ° C in a time$

Hot water cools from 60 $° C$ to 50 $° C$ in first 10 minutes and from 50 $° C$ to 42 $° C$ in next 10 minutes. The temperature of surrounding is :

$If α_{c} and α_{f} denote the numerical values of coefficient of linear expansion of a solid, expressed per ° C and per ° F respectively, then$

$A pendulum clock runs fast by 5 \sec . per day at 20 ° C and goes slow by 10 \sec . per day at 35 ° C . It shows correct time at a temperature of$

A constrained steel rod of length l, area of cross-section A Young's modulus Y and coefficient of linear expansion $α$ is heated through $t ° C$ . The work that can be performed by the rod when heated is

Two identical bodies are made of a material for which the heat capacity increases with temperature.One of these is at $100^{°}$ C,while the other one is at $0^{°}$ C. If the two bodies are brought into contact, then assuming no heat loss,the final common temperature is -

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U₁, at wavelength 500nm is U₂ and that at 1000nm is U₃ . Given Wien's constant $b = 2.88 \times 10^{6} n m - K$ . Which of the following is correct?