PHYSICS TEST 1

Question 1

WHAT IS THE STEAM POINT OF A THERMOMETER?

Answer 1

100 degrees celcius.

Question 2

WHAT IS THE ICE POINT OF A THERMOMETER?

Answer 2

0 degrees celcius.

Question 3

WHAT IS A TEMPERATURE SCALE?

Answer 3

This is when we choose 2 temperatures called the fixed points. We define the scale of temperature according to these 2 fixed points.

Question 4

WHAT IS A CELSIUS SCALE?

Answer 4

Lower fixed point(ice point) and upper fixed point(steam point)

Question 5

WHAT IS LOWER FIXED POINT?

Answer 5

Temperature of melting point taken under normal atmospheric pressure is taken as 0 degrees Celsius.

Question 7

WHAT IS UPPER FIXED POINT?

Answer 7

Temperature of steam over boiling water at normal atmospheric pressure is taken as 100 degrees Celsius.

Question 8

WHAT IS A THERMOMETER?

Answer 8

Any instrument which is used to measure temperature.

Question 9

WHAT DOES THE CHOICE OF WHICH TO USE DEPEND ON IN A THERMOMETER?

Answer 9

The accuracy required, the range of temperature to be measured and the physical conditions in which the thermometer is used.

Question 10

WHAT IS THE LOWEST POSSIBLE TEMPERATURE

Answer 10

0 Kelvin (-273 degrees Celsius)

Question 11

HOW TO CONVERT CELSIUS INTO KELVIN?

Answer 11

C + 273 degrees

Question 12

LABEL A LABORATORY THERMOMETER.

Answer 12

The glass bulb, the mercury, the stem, the thin bore glass tube, and the capillary tube.

Question 13

EXPLAIN 3 STRUCTURES OF A LABORATORY THERMOMETER.

Answer 13

1.The thermometer is made relatively small so that it is portable.
2. Capillary tube is narrow. Allows small changes in fluid column to be detected.
3. The liquid is contained in a thin glass tube. The thin walls ensures a quick transfer of heat across.

Question 14

EXPLAIN THE SENSITIVTY AND THE RESPONSIVENESS IN THE LABORATORY THERMOMETER.

Answer 14

SENSITIVITY- Small expansions of the liquid in a liquid bulb causes a big change in the length of the liquid thread in the capillary tube as it is made narrow. The narrower the bore, the higher the sensitivity.
RESPONSIVENESS- As the liquid is contained in a thin-walled, small glass bulb, it will be more responsive (faster response) to heat.
Mercury is reacts faster to temperature changes while alcohol reacts slower.

Question 15

WHAT IS ONE DIFFERENCE BETWEEN MERCURY AND ALCOHOL CONCERNING REACTION TO TEMPERATURE CHANGES.

Answer 15

Mercury reacts faster to temperature changes whereas alcohol reacts slower.

Question 16

WHAT IS THE RANGE LIMITED BY THE FREEZING AND BOILING POINTS OF THE LIQUID?

Answer 16

For mercury thermometer: -40 to 350 degrees Celsius.
For alcohol-in-glass thermometer: -115 to 78 degrees Celsius.

Question 17

WHAT IS THE FREEZING POINT OF A MERCURY AND AN ALCOHOL IN GLASS THERMOMETER?

Answer 17

MERCURY: -40
ALCOHOL IN GLASS: -115

Question 18

WHAT IS THE BOILING POINTS OF A MERCURY AND ALCHOL IN GLASS THERMOMETER?

Answer 18

MERCURY: 350 degrees Celsius
ALCOHOL IN GLASS: 78 degrees Celsius

Question 19

STATE 3 ADVANTAGES AND DISADVANTAGES OF A MERCURY THERMOMETER.

Answer 19

ADVANTAGES- 1. Responds quickly.
2.Does not wet sides of tube.
3.Thread easy to see.
DISADANTAGES- 1. Expensive
2. Poisonous
3. Hazardous if broken.

Question 20

STATE 3 ADVANTAGES AND DISADVANTAGES OF AN ALCOHOL- IN- GLASS THERMOMETER.

Answer 20

ADVANTAGES- 1. It is safe.
2. It is cheap.
3. Expands about 6 times of mercury.
DISADVANTAGES- 1. It does not respond quickly with temperature.
2. It wet the tube.
3. It is dyed.