MERIT YARD

Class 11th Physics - Thermal Properties of Matter - MERIT YARD

Question 1 / 40Which of the following temperature scales does not have a negative value?

A) Celsius

B) Fahrenheit

C) Kelvin

D) Reaumur

Question 2 / 40Water has maximum density at what temperature?

A) 0°C

B) 4°C

C) 100°C

D) -4°C

Question 3 / 40The SI unit of thermal conductivity is:

A) W m K

B) W m² K^-1

C) W m^-1 K^-1

D) J m K

Question 4 / 40Convert 50°C into Fahrenheit scale.

A) 100°F

B) 122°F

C) 90°F

D) 150°F

Question 5 / 40Heat required to change the state of a substance without change in temperature is:

A) Latent Heat

B) Specific Heat

C) Molar Heat

D) Thermal Capacity

Question 6 / 40A bimetallic strip consists of two metals with different:

A) Densities

B) Coefficients of linear expansion

C) Specific heats

D) Thermal conductivities

Question 7 / 40The value of absolute zero on Celsius scale is:

A) 0°C

B) -100°C

C) -373.15°C

D) -273.15°C

Question 8 / 40At what temperature do the Celsius and Fahrenheit scales show the same reading?

A) 0°

B) 40°

C) -40°

D) 100°

Question 9 / 40Cooking pots are provided with wooden handles because:

A) Wood is a good conductor

B) Wood is a poor conductor of heat

C) Wood is light

D) Wood is cheap

10 / 40The triple point of water is:

A) 273.15 K

B) 273.16 K

C) 0 K

D) 373.15 K

Question 11 / 40Linear expansion occurs in:

A) Solids

B) Liquids

C) Gases

D) All of these

Question 12 / 40Stefan-Boltzmann law states that total radiant energy is proportional to:

A) T

B) T²

C) T³

D) T⁴

Question 13 / 40Wien's displacement law relates:

A) Wavelength and Temperature

B) Pressure and Volume

C) Force and Area

D) Mass and Energy

Question 14 / 40The amount of heat required to raise the temperature of 1g of water by 1°C is:

A) 1 Joule

B) 1 Calorie

C) 1 Watt

D) 1 Kelvin

Question 15 / 40How much heat is needed to melt 2kg of ice? (Latent heat of fusion = 3.34 x 10⁵ J/kg)

A) 3.34 x 10⁵ J

B) 6.68 x 10⁵ J

C) 1.67 x 10⁵ J

D) 10⁶ J

Question 16 / 40Which mode of heat transfer requires a medium but no actual movement of particles?

A) Conduction

B) Convection

C) Radiation

D) Evaporation

Question 17 / 40Heat from the Sun reaches Earth by:

A) Conduction

B) Convection

C) Radiation

D) None of these

Question 18 / 40Newton's Law of Cooling is applicable when the temperature difference is:

A) Small

B) Very large

C) Zero

D) Infinite

Question 19 / 40The ratio of coefficient of linear (α), aerial (β) and volume (γ) expansion is:

A) 1 : 1 : 1

B) 1 : 2 : 3

C) 3 : 2 : 1

D) 1 : 3 : 2

Question 20 / 40Coefficient of volume expansion for an ideal gas at constant pressure is:

A) T

B) 1/T

C) T²

D) Zero

Question 21 / 40A perfect black body is one which:

A) Reflects all radiation

B) Transmits all radiation

C) Absorbs all radiation incident on it

D) Is black in color only

Question 22 / 40Relation between Joule (J) and Calorie (cal) is:

A) 1 cal = 1 J

B) 1 cal = 4.186 J

C) 1 J = 4.186 cal

D) 1 cal = 10 J

Question 23 / 40The value of coefficient of volume expansion for water is negative between:

A) 4°C to 10°C

B) 0°C to 4°C

C) 10°C to 100°C

D) Above 100°C

Question 24 / 40If a body cools from 60°C to 50°C in 5 minutes, how much time will it take to cool from 50°C to 40°C in the same surroundings?

A) 5 minutes

B) More than 5 minutes

C) Less than 5 minutes

D) 2 minutes

Question 25 / 40Sea breeze and land breeze are examples of:

A) Conduction

B) Natural convection

C) Forced convection

D) Radiation

Question 26 / 40The unit of Stefan's constant (σ) is:

A) W m² K⁴

B) W m^-2 K^-4

C) J m K

D) W m^-1 K^-1

Question 27 / 40What is the specific heat of water?

A) 1000 J/kg K

B) 4186 J/kg K

C) 500 J/kg K

D) 2100 J/kg K

Question 28 / 40A hole is drilled in a copper sheet. When the sheet is heated, the size of the hole:

A) Increases

B) Decreases

C) Remains same

D) Becomes oval

Question 29 / 40A metallic rod of length 1m is heated from 20°C to 100°C. If α = 10^-5 /°C, find change in length.

A) 0.8 cm

B) 0.8 mm

C) 8 mm

D) 0.08 mm

Question 30 / 40Radiation is emitted by:

A) Only hot bodies

B) All bodies above 0 K

C) Only the Sun

D) Only burning objects

Question 31 / 40Greenhouse effect is mainly due to:

A) Conduction

B) Convection

C) Trapping of infrared radiation

D) UV rays

Question 32 / 40At what temperature does ice, water and water vapour co-exist in equilibrium?

A) Boiling point

B) Triple point

C) Melting point

D) Critical point

Question 33 / 40A copper block of mass 1kg at 100°C is put in 1kg of water at 20°C. Final temp will be:

A) 60°C

B) 100°C

C) 20°C

D) Less than 60°C

Question 34 / 40Which of the following has the highest specific heat capacity?

A) Water

B) Iron

C) Copper

D) Mercury

Question 35 / 40Expansion during heating is:

A) Increase in weight

B) Increase in volume

C) Increase in density

D) None

Question 36 / 40Latent heat of steam (vaporization) is:

A) 80 cal/g

B) 540 cal/g

C) 100 cal/g

D) 273 cal/g

Question 37 / 40The temperature of a body is 300 K. Its value in Celsius is:

A) 300°C

B) 26.85°C

C) 573°C

D) 32°C

Question 38 / 40Thermal radiation travels with the speed of:

A) Sound

B) Light

C) Electrons

D) Molecules

Question 39 / 40Ideal gas equation is:

A) PV = T

B) PV = nRT

C) P/V = RT

D) VT = nPR

Question 40 / 40Heat capacity of a body depends on:

A) Mass and Material

B) Only temperature

C) Only volume

D) Color of the body

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