Question

@chrissy

Answer 1

The two temperature scales with the same interval step size are the?
Celsius and Fahrenheit.
Fahrenheit and Kelvin.
Kelvin and Celsius.
this does not exist.

2 Substance A has a higher specific heat than substance B. With all other factors equal, which requires the most energy to heat equal masses of A and B to the same temperature?
Substance A
Substance B
Both require the same amount of heat.
Answer depends on the density of each substance.

3 With all other factors equal, the most likely to burn your mouth when taken directly from an oven is a food with
higher specific heat.
lower specific heat.
specific heat is not important in this situation.
more information needed.

4 A large and a small container of water with the same temperature have
the same total amounts of internal energy.
the same amounts of internal and external energy.
different amounts of heat.
the same amounts of all forms of energy.

5 As a solid goes through a phase change to a liquid, heat is absorbed and the temperature
increases
decreases
remains the same
fluctuates.

6 Anytime a temperature difference occurs, you can expect
cold to move to where it is warmer.
energy movement from higher temperature regions
no energy movement unless it is warm enough, at least above the freezing temperature
energy movement flowing slowly from cold to warmer regions.

7 No water vapor is added to or removed from a sample of air that is cooling, so the relative humidity of this sample of air will
remain the same.
be lower.
be higher.
the answer depends on the temperature.

8 Temperature is
a form of heat transfer where energy is radiated in the form of rays.
a form of heat transfer.
a form of energy contained in an object associated with the motion of molecules.
a measure of the hotness or coldness of an object.

9 The amount of heat necessary to change an object's temperature 1 kg 1°C is called
fusion.
temperature.
radiant heat.
specific heat.

10 Expansion joints are used for materials that easily expand and contract depending upon its temperature. How much expansion can take place for a brass pipe 25.8 m long that experiences temperature changes of 75.2°C?
3.44 cm
5.90 cm
3.69 cm
1.23 cm

11 Average kinetic energy of molecules is
Inversely proportional to absolute temperature
Independent of absolute temperature
Directly proportional to absolute temperature
Directly proportional to square root of temperature

12 The specific heat of a gas in isothermal process is ?
0
Negative
constant
Infinite

13 Latent heat of ice is ?
Less than external latent heat of fusion
Equal to external latent heat of fusion
More then external latent heat of fusion
Twice the external latent heat of fusion

14 The r.m.s. velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0°C that of helium is
0°C
0°K
273°C
100°C

15 Mean square velocity of five molecules of velocities 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6 m/s is in
m2/s2
?
10
18
20
15

16 The difference between the principal specific heats of nitrogen is 300 J/kg °K and ratio of the two specific heats is 1.4. then the CP is
1050 J/kg °K
650 J/kg °K
750 J/kg °K
150 J/kg °K

17
CP
and
CV
denote the molar specific heats of a gas at constant pressure and at constant volume respectively. If and
CP/CV=γ,
then
CV
is equal to
R/(γ−1)
(γ−1)/R
Nosolution
373.2oC

18 A gas is taken in a sealed container at 300 K. it is heated at constant volume to a temperature 600 K. the mean K.E. of its molecules is
Halved
Doubled
Tripled
Quadrupled

19 R.M.S velocity of a gas molecule of mass m at given temperature is proportional to
mo
m
m1/2
1/m1/2

20 The mean kinetic energy of one gram-mole of a perfect gas at absolute temperature T is
0.5kT
0.5RT
1.5kT
1.5RT

Answer 2

@chrissyC.

Answer 3

@chrissyC.

Answer 4

@chrissyC.

Answer 5

ok give me a minute would you like every answer with an explanation or just the answer

Answer 6

every explanation but i have more than 200 questions

Answer 7

but you can put the answers first and later exp lane cos its urgent

Answer 8

thanks sweetheart

Answer 9

should i post the next 20 questions?

Answer 10

i think i found something that has every single one of those questions with the answer and explanation

Answer 11

what is it?

Answer 12

http://highered.mheducation.com/sites/dl/free/0072414944/9343/heatFra.html I think this is the link

Answer 13

yes it is

Answer 14

ok thanks but what about the rest

Answer 15

what do you meen?

Answer 16

were it has blue writing click it likeit will say #1 answer click that

Answer 17

The specific heat of a substance at its boiling point or melting point
Is 0
Is infinity
Is negative
lies between 0 and 1

2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is
Specific heat
Latent heat of vaporization
Latent heat of fusion
External latent heat

3 At a certain temperature, hydrogen molecules have r.m.s. velocity of 3 km/s. what is the r.m.s velocity of the oxygen molecules at the same temperature?
0.25 km/s
0.5 km/s
0.75 km/s
0.6 km/s

4 Which one of the following quantities can be zero on a average for the molecules of an ideal gas in equilibrium?
Kinetic energy
Density
Momentum
Speed

5 The specific heat of a gas
Has only one value
No answer
Is proportional to the square root of its absolute temperature
Can have any value between 0 and infinity

6 At constant volume temperature is increased then
Collision on walls will be less
Collision frequency will be increases
Collision will be in straight line
Collision will not change

7 A sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T, the mass of each molecules is m. the expression for the density of gas is (k = Boltzmann constant
mkT
P/kT
P/kTV
Pm/kT

8 If for a gas
R/CV=0.67
this gas is made up of molecules which are
Diatomic
Mixture of diatomic and polyatomic
Mono atomic
Polyatomic

9 The specific heat of a substance at its boiling point or melting point
0
infinity
negative
between 0 and 1

10 Mass of gas is 300 gm and its specific heat at constant volume is 750 J/kg K. if gas is heated through 75°C at constant pressure of 105 N/{m^2}, it expands by volume
0.08×106cm3
. find
CP/CV
.
1.4
1.374
1.474
1.5

11 A solid ball with a mass m = 0.53 kg floats in a tank of water. The ball is made of material with a density of 400
kg/m3
. The density of water is 1000
kg/m3
. What fraction of the volume of the ball is below the waterline?
0.1
0.2
0.3
0.4

12 A slab of wood with mass m = 1.7 kg floats 78% submerged.The density of water is 1000
kg/m3
. What is the density of the wood?
720
kg/m3
780
kg/m3
850
kg/m3
900
kg/m3

13 A solid X is in thermal equilibrium with a solid Y, which is at the same temperature as a third solid Z. The three bodies are of different materials and masses. Which one of the following statements is certainly correct? of 164.9J/s, calculate the the thermal conductivity of aluminum
X and Y have the same heat capacity
X and Y have the same internal energy
It is not necessary that Y should be in thermal equilibrium with Z
There is no net transfer of energy if X is placed in thermal contact with Z

14 A hot water tank of heat capacity 5000 JK-1 contains 10 kg of water at 25 °C. What is the time taken to raise the temperature of the water to 45 °C using a heater coil of power of 3.0 kW, given that the specific heat capacity of water is 4200 Jkg-1 K-1?
61 s
280 s
310 s
610 s

15 A solid object M is made of a material with a specific capacity c and a specific latent heat of fusion L.The object is heated up at a constant rate P. Its initial temperature is below its melting point by ΔT. The time for the object to be completely melted is given by
M(cΔT + L)/P
M(c + L)ΔT/P
P/[mΔT(c + L)]
P/[m(cΔT + L)]

16 A student tries to determine the specific latent heat of vaporisation of a liquid by an electrical method. A heater is used to boil the liquid and when the liquid is boiling, the mass of liquid vaporised per second is measured at two different powers for the heater. At the power of 40 W and 80 W, the liquid is vaporised at the rate of 0.0417
kgs−1
and 0.0893
kgs−1
respectively. What is the best estimate of the specific latent heat of vaporisation of the liquid?
840Jkg−1
896Jkg−1
928Jkg−1
959Jkg−1

17 The temperature 47.12 °C is equivalent to
320.28 K
320.27 K
-226.03 K
-226.04 K

18 A gas cylinder is fitted with a safety valve which releases a gas when the pressure inside the cylinder reaches
2.0x106Pa
. Given the maximum mass of this gas that the cylinder can hold at 10 °C is 15 kg, what would be the maximum mass at
30∘C
?
5 kg
14 kg
20 kg
45 kg

19 2 bulbs X and Y are filled with an ideal gas and connected by a capillary tube. The volume of bulb X is three times that of bulb Y. The number of gas molecules in X and Y are 2N and N respectively. If the temperature of the gas in Y is 300 K, what is the temperature of the gas in X
150 K
200 K
450 K
600 K

20 An ideal gas is contained in two metal cylinders X and Y connected by a tap which is initially closed. The volume and pressure of the gas in the cylinders are as attached.When the tap connecting the two cylinders is opened, what will be the final pressure, in Pa, in the vessel? Assume that the temperature remains constant
Click here to see exhibit
2.4×105
3.5×105
4.2×105
5.0×105

Answer 18

@chrissyC.