Question Library — KalmiPrep by Kalmitech

Physics UTME / JAMB 1995 Thermal Physics

A quantity of ice at 10oC is heated until the temperature of the heating vessel is 90oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?

A

specific heat capacity of ice

B

specific heat capacity of water

C

specific latent heat of fusion

D

specific latent heat of vaporization

medium Difficulty

Physics UTME / JAMB 1995 Thermal Physics

A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?

A

58oC

B

62oC

C

64oC

D

76oC

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

The ice and steam points on a mercury in glass thermometer are found to be 90mm apart. What temperature is recorded in degree Celsius when the length of the mercury thread is 33.6mm above the ice point mark?

A

33.6°C

B

35.0°C

C

37.3°C

D

52.7°C

E

62.7°C

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

When two objects P and Q are supplied with the same quantity of heat,the temperature change in P is observed to be twice that in Q. If the masses of P and Q are the same,calculate the ratio of the specific heat capacities of P and Q

A

1:1

B

1:3

C

1:4

D

1:2

E

4:1

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

A steam trap is a component of apparatus used in determining the specific latent heat of vaporization of steam. In the steady state, the steam trap

A

stores the steam for future use

B

prevents the steam from escaping

C

ensures that only dry steam gets into the calorimeter

D

allows condensed steam to go into the calorimeter

E

determines the quantity of steam used

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

A metal rod of length 40cm at 20°C is heated to a temperature of 45°C. If the new length of the rod is 40.05cm. Calculate its linear expansitivity

A

1.2 x \(10^{-5}K{-1}\)

B

2.5x \(10^{-5}K{-1}\)

C

3.5x \(10^{-5}K{-1}\)

D

4.5x \(10^{-5}K{-1}\)

E

5x \(10^{-5}K{-1}\)

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J\(kg^{-1}K^{-1}\)

A

9000J

B

12600J

C

21000J

D

25200J

E

88200J

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

An electric kettle rated 1500W boils away 0.3kg of a liquid at its boiling point every 300s. Calculate the specific latent heat of the vaporisation of the liquid

A

1.5 x \(10^6Jkg^-1\)

B

1.35 x \(10^6Jkg^-1\)

C

1.5 x \(10^5Jkg^-1\)

D

4.5 x \(10^2Jkg^-1\)

E

3 x \(10^2Jkg^-1\)

medium Difficulty

Physics WAEC / WASSCE 1994 Thermal Physics

Calculate the time taken to heat 2kg of water from 50^\circC to 100^\circC in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200\(kg^{-1}K{-1}\)

A

2.5 minutes

B

5.7 minutes

C

6.7 minutes

D

7.5 minutes

E

9.5 minutes

medium Difficulty

Physics UTME / JAMB 1994 Thermal Physics

The melting point of naphthalene is 78oC. What is this temperature in kelvin

A

100k

B

351k

C

378k

D

444k

medium Difficulty

Physics UTME / JAMB 1994 Thermal Physics

When 100g of liquids L1 at 78^\circC was mixed with Xg of liquid L2 at 50^\circC, the final temperature was 66^\circC. Given that the specific heat capacity of L2is half that of L1, find x

A

50g

B

100g

C

150g

D

200g

medium Difficulty

Physics UTME / JAMB 1994 Thermal Physics

If a room is saturated with water vapour, the temperature of the room must be

A

at 0oC

B

above the dew point

C

at 100oC

D

below or at the dew point

medium Difficulty

Physics WAEC / WASSCE 1993 Thermal Physics

The expansion of solids can be considered a disadvantage in the

A

fire alarm system

B

thermostat

C

riveting of steel plates

D

balance wheel of a watch

E

fitting of wheels on rims.

medium Difficulty

Physics WAEC / WASSCE 1993 Thermal Physics

What amount of current would pass through a 10 \Omega coil if it takes 21s for the coil to just melt a lump of ice of mass 10g at 0oC if there are no heat losses? (Latent heat of fusion of ice = 336 Jg\(^{-1}\)).

A

16.00A

B

4.00 A

C

0.50A

D

0.25A

E

0.06 A

medium Difficulty

Physics WAEC / WASSCE 1993 Thermal Physics

How long does it take a 750 W heater operating at full rating to raise the temperature of 1 kg of water from 40oC to 70oC? (Take the specific heat capacity of water as 4200 J kg-1 K-1 and neglect heat losses).

A

84s

B

112s

C

168s

D

280s

E

616s

medium Difficulty