Physics Test 161

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Physics Test 161

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Weekly Quiz Competition

Question 1
4 / -1

A constant volume gas thermometer shows pressure reading of 50cm and 90cm of mercury at 0°C and 100° C respectively. When the pressure reading is 60 cm of mercury, the temperature is

A
25°C

B
40°C

C
15°C

D
12.5°C

Solution
Question 2
4 / -1

A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquids. The boiling point of the liquid will be

A
135°C

B
125°C

C
112° C

D
100°C

Solution
Question 3
4 / -1

Two spheres made of same substance have diameters in the ratio 1: 2. Their thermal capacities are in the ratio of

A
1:2

B
1:8

C
1:4

D
2:1

Solution

Thermal capacity = Mass x Specific heat

Due to same material both spheres will have same specific heat.

Also mass = Volume (V) x Density (ρ)

∴ Ratio of thermal capacity
Question 4
4 / -1

Work done in converting one gram of ice at -10°C into steam at 100° C is

A
3045J

B
6056J

C
721J

D
616J

Solution

Ice (–10°C) converts into steam as follows (c = Specific heat of ice, c = Specific heat of water)

Hence work done W = JQ = 4.2 x 725 = 3045 J
Question 5
4 / -1

2gm of steam condenses when passed through 40gm of water initially at 25°C. The condensation of steam raises the temperature of water to 54.3°C. What is the latent heat of steam

A
540 cal/g

B
536 cal/g

C
270 cal/g

D
480 cal/g

Solution

Let L be the latent heat and using principle of calorimetry.
Question 6
4 / -1

Three liquids with masses M₁, M₂, M₃ are thoroughly mixed. If their specific heats are C₁, C₂, C₃ and their temperatures T₁, T₂, T₃ respectively, then the temperature of the mixture is

A

B

C

D

Solution

Let the final temperature be T°C.

Total heat supplied by the three liquids in coming down to 0°C = m₁ C₁ T₁ + m₂ C₂ T₂ + m₃ C₃ T₃.....(i)

Total heat used by three liquids in raising temperature from 0°C to T°C

= m₁ C₁ T + m₂ C₂ T + m₃ C₃ T .....(ii)

By equating (i) and (ii) we get

(m₁ C₁ + m₂ C₂ + m₃ C₃) T

= m₁ C₁ T₁ + m₂ C₂ T₂ + m₃ C₃ T₃
Question 7
4 / -1

The temperature for which the reading on Celsius and Fahrenheit scales are identical is

A
-273°C, -273 °F

B
-30°C, -30 °F

C
0 °C, 0 °F

D
-40 °C, -40 °F

Solution

The Celsius and Fahrenheit are two important temperature scales. The Fahrenheit scale is used primarily in the United States, while Celsius is used throughout the world. The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit one. There is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 degree C and -40 degree F.
Question 8
4 / -1

A steel tape is calibrated at 20° C. A piece of wood is being measured by steel tape at 10°C and reading is 30 cm on the tape. The real length of the wood is:

A
Equal to 30 cm

B
less than 30 cm

C
cannot be perdicted

D
more than 30 cm

Solution

When heated the length between adjacent markings increases. Hence the actual length will be less than 30 cm.
Question 9
4 / -1

Which phase of matter has maximum value of temperature coefficient of cubical expansion?

A
Gaseous

B
Solid

C
Liquid

D
none of these

Solution

Gas expands more than solid and liquid because gas particles are far apart hence freely move.
Question 10
4 / -1

The coefficient of liner expansion of a cubical crystal along three mutually perpendicular direction is α₁ α₂and α₃. What is the coefficient of cubical expansion of crystal?

A
α₁+ α₂+ α₃

B
α₁+ α₂- α₃

C
α₁- α₂- α₃

D
(α₁+ α₂)/ α₃

Solution

Cubical expansion means there is expansion is length (a₁), breadth (a₂) and height (a₃). Therefore the net coefficient of cubical expansion is α₁ + α₂ + α₃.