Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1991 Thermal Physics

A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady 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

determine the quantity of steam used

medium Difficulty

Physics WAEC / WASSCE 1991 Thermal Physics

The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?

Attached Figure / Diagram

A

S1, would move upward but S2 would not move

B

S1 would not move but S2 would move upwards

C

both S1 and S2 would move upwards

D

S1 would move downwards and S2 would move downwardw

E

S1 would move downwards and S2 wouldnmove downwards

medium Difficulty

Physics WAEC / WASSCE 1991 Thermal Physics

A wire, 20m long is heated from a temperature of 5oC to 55oC. If the change in length is 0.020m, calculate the linear expansivity of the wire

A

1.0 x 10-3k-1

B

2.0 x 10-4k-1

C

2.0 x 10-5k-1

D

1.0 x 10-5k-1

E

2.0 x 10-6k-1

medium Difficulty

Physics WAEC / WASSCE 1991 Thermal Physics

In the circuit above R is a resistor whose resistance increases with an increase in temperature. L1 and L2 are identical lamps. If the temperature of R increases

Attached Figure / Diagram

A

L1 becomes brighter and L2 becomes dimmer

B

L1 becomes brighter and L2 does not change

C

L2 becomes dimmer and L1 does not change

D

L1 becomes dimmer and L2 does not change

E

L1 and L2 becomes brighter

medium Difficulty

Physics WAEC / WASSCE 1990 Thermal Physics

The absolute zero temperature is defined as the temperature at which

A

thermal motion ceases

B

the temperature of a gas is 273oC

C

ice melts

D

the volume of a real gas is maximum

E

the pressure of a real gas is maximum

medium Difficulty

Physics WAEC / WASSCE 1990 Thermal Physics

A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?

A

1/3α Vt

B

1/2α Vt

C

α Vt

D

2α Vt

E

3α Vt

medium Difficulty

Physics WAEC / WASSCE 1990 Thermal Physics

Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?

A

22.5oC

B

32.4oC

C

77.0oC

D

87.0oC

E

360.0oC

medium Difficulty

Physics WAEC / WASSCE 1990 Thermal Physics

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the

A

volume of P is greater than that of Q

B

specific heat capacity of P is higher than that of Q

C

density of P is greater than that of Q

D

density of P is lower than that of Q

E

specitic heat capacity of P is lower than that of Q.

medium Difficulty

Physics WAEC / WASSCE 1990 Thermal Physics

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?

A

1.38 x 106 J

B

2.53x104J

C

7.66x103J

D

1.38x103J

E

1.27 X103J

medium Difficulty

Physics UTME / JAMB 1990 Thermal Physics

The resistances of platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm

A

43.0oC

B

50.0oC

C

69.9oC

D

87.0oC

medium Difficulty

Physics UTME / JAMB 1990 Thermal Physics

A bar of initial length /0 is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is

A

\(\frac{/ - /_o}{/ \Delta t}\)

B

\(\frac{/ - /_o}{/_o \Delta t}\)

C

/o(1 + \(\Delta\) t)

D

\(\frac{/ - /_o}{/(1 + \Delta t)}\)

medium Difficulty

Physics UTME / JAMB 1990 Thermal Physics

1kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [specific heat capacity of copper 400Jkg-1K-1 and latent heat of fusion of ice 333 x 103Jkg-1]

A

60g

B

67g

C

120g

D

133g

medium Difficulty

Physics WAEC / WASSCE 1989 Thermal Physics

A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.

A

67.5oC

B

30.0oC

C

25.0oC

D

15.0oC

E

10.0oC

medium Difficulty

Physics UTME / JAMB 1989 Thermal Physics

From the kinetic theory of gases, temperature is a

A

form of energy and is proportional to the total kinetic energy of the molecules

B

form of energy and is proportional to the average kinetic energy of the molecules

C

physical property and is proportional to the total kinetic energy of the molecules

D

physical property and is proportional to the average kinetic energy of the molecules

medium Difficulty

Physics UTME / JAMB 1989 Thermal Physics

A beam of radiation is passed between a pair of charged plates as indicated in the fig above. Beam P is undetected While Q is deflected to the left. P and Q respectively should be I.γ-rays \beta-rays II. x-rays \beta-rays III. γ-rays x-rays IV. x-rays x-rays

Attached Figure / Diagram

A

I only

B

III only

C

I and II

D

III and IV

medium Difficulty