1 Which of the following is true

1 Which of the following is true?

AThe unit of heat is o C B Heat is a form of energy C Heat flows from a cold substance to a hot substance.

2 Heat and temperature areAforms of energy Bscalar quantities

Cmeasured in the same S.I.units

Dmeasured by the same instrument.

30 oC is equivalent to

A - 273 K B -173 K C 100 K D 273 K E 373 K4An earth-monitoring satellite falls into the earths atmosphere at a high velocity and reaches at the sea surface with a high temperature. After a while the temperature of the satellite is same as the temperature of the sea water. This is caused by

AThe heat released by the satelliteB The heat absorbed by the sea water

CThe satellite is cooled by the sea water

D The satellite and the sea water are in thermal equlibrium

5The diagram shows a metal sphere P at 80oC is immersed in a cooler liquid Q.

Thermal equilibrium is reached when

Atemperature of P = temperature of Q

Bmass of Q displaced = mass of P

Cvolume of Q = volume of P

Dspecific heat capacity of P = specific heat capacity of Q

6The diagram shows two copper blocks, L and M, touching each other. The initial temperatures of L and M are 50 oC and 30 oC respectively.

Which statement is correct when L and M are at thermal equilibrium?

ATemperature of L is higher than M

BThe quantity of heat in L is the same as in M

C Rate of change in temperature of L is bigger than that of M

D Net rate of heat flow between L and M is zero

7The diagram shows object A and object B are of temperatures T1 and T2. The heat flows from A to B until the thermal equilibrium is reached at a temperature T.

Which relationship between T1 , T2 and T is true?

AT1 > T2 > T

BT2 > T1 > T

CT1 > T > T2

DT2 > T > T18Which principle is used in a Mercury thermometer?

APrinciple of conservation of temperature

B Principle of conservation of energyCPrinciple of thermal equilibrium

DPrinciple of the forces in equilibrium

9Regarding to the fixed points in the Celsius scale of a mercury thermometer , which of the following is true?

Lower fixed point Upper fixed point

Athe freezing point the boiling point

of mercury of mercury

Bthe boiling point the freezing point

of mercury of mercury

Cthe freezing point the boiling point

of water

of water

Dthe boiling point the freezing point

of water

of water

10The lengths of the mercury column in a thermometer at the ice point and the steam point are 5 cm and 25 cm respectively. When the thermometer is placed in a liquid , the length of the mercury column is 12 cm. What is the temperature of the liquid?

A 30 o CB 35 o C C 55 o C D 70 o C E 85o C

11The lengths of the mercury thread in a thermometer are 8 cm and 20 cm respectively at 0oC and 100oC. What is the length of the thread when the thermometer is placed in a substance at -25oC.

A 4 cmB 5 cm C 10 cm D 12 cm E16 cm12The diagram shows a thermometer.

Which modification will increase the sensitivity of

the thermometer?

AUsing a longer capillary tube

BUsing a bulb with a thicker wall

CUsing a glass stem with a thicker wall

DUsing a narrower bore of capillary tube

13Heat energy is supplied at the same rate to 0.4 kg of substance P and 0.4 kg of substance Q in similar containers. The temperature of substance P rises faster.

This is because the substance PA is less dense than substance Q

Bis more dense than substance Q

C evaporates less readily than substance Q

Dhas a smaller specific heat capacity than substance Q

14The diagram shows solid blocks M and N of equal mass, which are being heated. The initial temperature of M and N is the same and heated by the same amount of energy.

It observed that M is hot faster than N. This observation is due to the difference in

Adensity B melting point Clatent heat of fusion Dspecific heat capacity

15The diagrams show four types of metal block of the same mass being heated using the same quantity of heat for 10 minutes. Which metal block shows the highest increase in the temperature?

16The diagrams represent two beakers contain liquid W and liquid X respectively. Each liquids receiving the same heat energy Q.

Which statement about W and X is correct?

AThe specific heat capacity of W is half the

specific heat capacity X.

BThe specific heat capacity of W is twice the

specific heat capacity X.CThe specific heat capacity of W is same as the specific heat capacity X.

17What is the energy released by a metal block of mass 5.0 kg when it is cooled from 30o C to 20 o C. (specific heat capacity of the metal = 500 J kg-1o C -1)

A1.25 x 104 J B2.5 x 104 JC 5.0 x 104 J

D 6.25 x 104 J E 8.85 x 104 J

183 200 J of energy is absorbed by a copper block of mass 0.1 kg when it is heated from 30o C to 110 o C. What is the specific heat capacity of copper?A 200 J kg-1 o C -1 B 400 J kg-1 o C-1 C 800 J kg-1 o C -1 D1000Jkg-1oC -1 E 2000Jkg-1oC -119When 0.6 kg water of 40o C is mixed with 0.4 kg water of 90o C, what is the final temperature of the mixture?

A55o CB 60o C C 65o C D 70o C E 75o C

200.5 kg liquid M at 40o C is mixed with 2 kg liquid N at 25o C. The mixture is stirred . What is the maximum temperature reached by the mixture? ( specific heat capacity of liquid M = 8.4 x 103 J kg -1o C-1) ( specific heat capacity of liquid N = 4.2 x 103 J kg -1 o C-1 ) A28o CB 30o C C 32.5o C D34.5o CE 38.5o C

21A beaker is filled with 2 kg of water at 30 o C . A plumbum sphere of mass 1.5 kg at 90o C is placed in the beaker. The final temperature reached by the water and the sphere are

31.5o C .What is the specific heat capacity of plumbum?

( specific heat capacity of water = 4.2 x 103 J kg -1 o C-1,A144 J kg -1 o C-1 B 568 J kg -1oC-1 C1425 J kg -1 o C-1 D2070J kg-1oC-1 E 3020 J kg-1oC-122A 240 V, 2 kW electric heater is immersed in 6 kg of a liquid and switched on for 5 minutes.What is the rise in temperature of the liquid?( specific heat capacity of the liquid = 4.2 x 103 J kg -1 o C-1 )

A5 o C B 10 o C C 15 o C D 18 o CE 24 o C

23A 800 watt kettle holds 0.5 kg of water at 30 o C. It is turned on until the water boils. What is the time taken to boil the water? (specific heat capacity = 4.2 x 103 J kg -1oC-1)

A76 s B 168 sC 184 s D 340 s E 520 s24The diagram shows the temperature time graph of a liquid . The liquid is heated by using a 0.4 kW heater . The mass of the liquid is 0.2 kg .

What is the specific heat capacity of the liquid?

A 1000J kg -1 o C-1 B 2000 J kg -1o C-1 C 3000 J kg -1 o C-1 D 4000 J kg -1 o C-1 E 5000 J kg -1 o C-125 A metal block is dropped from a height of 82 m. What is the rise in the temperature of the metal block after it hits the ground?( specific heat capacity of the metal block = 410

J kg -1oC-1 )

A 0.5 o CB 1.0 o C C 2.0 o C D 4.0 o C E 8.0 o C

26An Asteroid of mass 500 kg travellling in atmosphere with a velocity 2000 m s-1 . The temperature of the Asteroid rises by 10000oC. What is the specific heat capacity of the

Asteroid ?

A 100 J kg -1 o C-1 B 200 J kg -1oC-1 C 400 J kg -1 o C-1 D1000Jkg -1oC-1 E 2000J kg -1o C-1 27Which of the following is true?

Specific heat capacity of cooking utensilSpecific heat of the handle of the cooking utensil

Ahighhigh

Blowhigh

Chighlow

Dlowlow

28A substance changes from a liquid state to a solid state. This process is called

AfusionB sublimationC vaporization

Dsolidification29 A liquid naphthalene begin to solidify.Which of the following is true?

A Temperature decreases B Temperature increases

CHeat is absorbed D Heat is released

30 The latent heat is released when

Aliquid changes to steam B solid changes to steam

Csteam change to liquid

31The graph shows the heating curve of a substance.

At which stage is the substance in a solid and liquid state at the same time?

APQB QR CRS D ST32The graph shows the cooling curve of a substance.

Which of the following is true?

AAt section WX the average kinetic energy of the substance molecules decreases

BAt section XY heat is not released

CAt section YZ the substance exits in the

solid and liquid states33The diagram shows a process in which water is changed to steam.

The heat absorbed during the process is called

Aspecific heat capacity of vapour

Bspecific heat capacity of liquid

Clatent heat of vaporisation

Dlatent heat of fusion34The specific latent heat of fusion of ice is the quantity of energy required toAchange 1 kg of ice from ice to water with 1o C rise in temperature

Bchange 1 kg of ice from water to steam without a change in temperature

Cchange 1 kg of ice from water to steam with 1o C rise in temperature

Dchange 1 kg of ice from ice to water without a change in temperature

350.4 kg of water at 100o C. What is the quantity of heat required to change the water to steam at 100oC? [ Specific latent heat of vaporisation of water =2.3x106 Jkg-1 ]

A9.2 x102 J B9.2 x105 J C 9.2 x106 J

D9.2 x108 J E9.2 x1010 J

36What is the quantity of heat released to change 0.3 kg of water at 0o C to ice at 0o C ?[ specific latent heat of fusion of ice = 3.3 x105 J kg -1 ] A 9.9 x102 J B 9.9 x104 J C 9.9 x106 J

D 9.9 x108 J E9.9 x1010 J

37What is the quantity of heat required to change 0.02 kg of ice at 0o C to water at 40o C ?[ specific heat capacity of water = 4.2 x 103 J kg-1 o C-1 specific latent heat of fusion of ice = 3.34 x105 J kg -1 ] A3 320 J B 3 360 J C 6 680 J D 10 040 JE267 200 J

38A 2 000 W electric heater is used to change 2 kg of water at 100o C to steam. What is the time tken to change the water to steam? [ Specific latent heat of vaporisation of water

=2.26 x106 Jkg-1 ]

A590 sB 1540 s C 2260 s D 3280 s E 4070 s

39A 500 W electric heater is used to heat 0.1 kg of a liquid to its boiling point. The liquid is allowed to boil in 3 minutes again until the mass of liquid becomes 0.06 kg. What is the specific latent heat of vaporisation of the liquid?

A4.75 x106J kg-1 B 3.85 x106J kg-1 C 2.25 x106J kg-1D1.15 x106J kg-1E 1.45 x106J kg-140 A steam burn is more damaging than a burn from boiling water at the same temperature. It is because Athe water boils and released heat to surroundings

Bthe steam has a higher temperature than the boiling water

Cthe heat released from condensing steam.