R4RIN – MCQs, Mock Tests | MCAT MCAT Physics Mcq Questions Heat and Thermodyanimcs

The particles in the wave separated through __________ multiple of ? are out of phase to each other

1. (n)
2. (n+1)
3. (n+1/2)
4. both (a) and (c)

✅ Correct Answer: 3

Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are

1. Longitudinal
2. Transverse
3. Periodic
4. both (a) and (c)

✅ Correct Answer: 4

Newton estimated the speed of sound

1. 281m/sec
2. 333m/sec
3. 340m/sec
4. all of the above

✅ Correct Answer: 1

Laplace found that the alternate compressions and rarefactions produced in sound waves follows

1. isothermal law
2. adiabatic law
3. isochoric law
4. all of the above

✅ Correct Answer: 2

For destructive interference of sound waves the path difference between two interfering sounds should be

1. n?
2. (n+1/2)?
3. some time n? and some times (n+1/2)?
4. none of these

✅ Correct Answer: 2

The speed of sound in hydrogen is __________ time than that in oxygen

1. Two times
2. Three times
3. Four time
4. Six time

✅ Correct Answer: 3

The beats frequency (sensible) for a human car is

1. 42Hz
2. 7 Hz
3. 256Hz
4. 262Hz

✅ Correct Answer: 2

The speed of stationary waves in a stretched string are independent of

1. Number of loops
2. Tension in the string
3. Point where string is plucked
4. both (a) and (c)

✅ Correct Answer: 4

Fundamental frequency of stationary waves in open pipe is ________ times the frequency in closed pipe.

1. One
2. Two
3. Four time
4. None of these

✅ Correct Answer: 2

Which phenomena can be applied to estimate the velocity of star with respect to earth

1. Dopplers effect
2. Interference of waves
3. Beats phenomena
4. All of these

✅ Correct Answer: 1

Dimension of pressure is

1. MLT
2. ML-1T-1
3. ML-1T-2
4. ML-2T-2

✅ Correct Answer: 3

Temperature is a property which determines

1. How much heat a body contains
2. Whether a body will feel hot or cold to touch
3. In which direction heat will flow between two systems
4. How much total absolute energy a body has

✅ Correct Answer: 3

We prefer mercury as a thermometric substance because

1. Over a wide range of temperature its expansion is uniform
2. It does not stick to thermometer glass
3. It opaque to light
4. All of above

✅ Correct Answer: 4

The scales of temperature are based on two fixed points which are

1. The temperatures of water at 0? 100?C
2. The temperature of melting ice and boiling water at atmospheric pressure
3. The temperatures of ice cold and boiling water
4. The temperatures of frozen and boiling mercury

✅ Correct Answer: 2

Numerical value of Boltzmanns constant is

1. 1.38x10-31JK-1
2. 3.18x10-31JK-1
3. 3.18x10-23JK-1
4. 1.38x10-23JK-1

✅ Correct Answer: 4

In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because

1. Mercury takes a long time to contract
2. The amount of mercury use is very small
3. The capillary tube has a small constriction near the bulb
4. The capillary tube is very narrow

✅ Correct Answer: 3

Normal human body temperature 98.6?F corresponds to

1. 37?C
2. 42?C
3. 55?C
4. 410?C

✅ Correct Answer: 1

The Fahrenheit and centigrade scales agree to

1. 40
2. 15.5
3. 542
4. 273

✅ Correct Answer: 1

The size of one degree of Celsius is equal to

1. One degree of Fahrenheit scale
2. 1.8 degrees of Fahrenheit scale
3. 3.2 degrees of Fahrenheit scale
4. 2.12 degrees of Fahrenheit scale

✅ Correct Answer: 2

At constant temperature the graph between V and 1/P is

1. Hyperbola
2. Parabola
3. A curve of any shape
4. A straight lime

✅ Correct Answer: 4

According to Pascals law the pressure of gas in a vessel is

1. Different in different direction
2. Same in all direction
3. Same only along opposite directions
4. Same only along normal directions

✅ Correct Answer: 2

We can produce heat by

1. Frictional process
2. Chemical processes
3. Electrical processes
4. All of the above

✅ Correct Answer: 4

Which one is true for internal energy?

1. It is sum of all forms of energies associated with molecules of a system
2. It is a state function of a system
3. It is proportional to transnational K.E of the molecules
4. All are correct

✅ Correct Answer: 4

Metabolism is the name of a process in which energy transformation takes place within

1. Heat engine
2. Human body
3. Atmosphere
4. Laboratory

✅ Correct Answer: 2

Which one is not an example of adiabatic process ?

1. rapid escape of air from a burst tyre
2. rapid expansion of air
3. conversion of water into ice in refrigerator
4. cloud formation in the atmosphere

✅ Correct Answer: 3

The pressure exerted by a column of mercury 76cm high and at 0?C is called

1. 1 atmosphere
2. 1 Newton per square meter
3. 1 Pascal
4. data is insufficient

✅ Correct Answer: 1

Standard condition STP refer to a gas at

1. 76cm 0?C
2. 760mm 273K
3. 1atm 273K
4. all of the above

✅ Correct Answer: 4

If the volume of a gas is held constant and we increase its temperature then

1. its pressure is constant
2. its pressure rises
3. its pressure falls
4. any of above

✅ Correct Answer: 2

If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of

1. Boyles law
2. Charles law
3. Ideal gas law
4. Avagadros law

✅ Correct Answer: 2

Boyles law helds for ideal gases in

1. isochoric processes
2. isobaric processes
3. isothermal processes
4. adiabatic processes

✅ Correct Answer: 3

Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their

1. volume
2. pressure
3. absolute temperature
4. time

✅ Correct Answer: 3

Which one of correct relation ?

1. Cp+Cv=?
2. Cp=1+R/Cv
3. ?=Cp/Cv
4. Cp=1-R/Cv

✅ Correct Answer: 3

The reading on the Fahrenheit scale will be double the reading on the centigrade scale when the temperature on the centigrade scale is

1. 460?C
2. 280?C
3. 360?C
4. 160?C

✅ Correct Answer: 3

The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine

1. at any instant
2. averagely
3. during its operation
4. during one cycle

✅ Correct Answer: 4

For a gas obeying Boyles law if the pressure is doubled the volume becomes

1. double
2. one half
3. four times
4. one fourth

✅ Correct Answer: 2

Triple point of water is

1. 273?C at 6.11 Kpa
2. 273K at 61.6 Kpa
3. 273.16?C at 0.611 Kpa
4. 273.16K at 750 Kpa

✅ Correct Answer: 3

Which of the following properties of molecules of a gas is same for all gases at particular temperature?

1. momentum
2. mass
3. velocity
4. kinetic energy

✅ Correct Answer: 4

Boltzman constant K in terms of universal gas constant R and Avagadros number Na is give as

1. K = RNa
2. K = R/Na
3. K = Na/Ra
4. K = nRNa

✅ Correct Answer: 2

Average translational kinetic energy per molecule of an ideal gas is given by

1. 3NaT/2R
2. 2NaT/3
3. 3RT/2Na
4. 3Na/2RT

✅ Correct Answer: 3

In which process entropy remains constant

1. isobaric
2. isochoric
3. adiabatic
4. isothermal

✅ Correct Answer: 3

Adiabatic process is also called

1. Heat exchange process
2. Heating process
3. Isentropic process
4. All of the above

✅ Correct Answer: 3

Which quantity is a state function

1. internal energy
2. heat supply
3. pressure
4. volume

✅ Correct Answer: 1

The value of ? for diatomic gas is

1. 1.67
2. 1.4
3. ? = 1.3
4. none

✅ Correct Answer: 2

The work done in the isochoric process is

1. constant
2. variable
3. zero
4. depends on situation

✅ Correct Answer: 3

In which process all the heat supplied is converted into work done.

1. isothermal
2. isochoric
3. isobaric
4. isentropic

✅ Correct Answer: 1

For the successful operation of Heat engine which condition should be met.

1. cyclic process
2. operated at certain temperature difference
3. both (a) and (b)
4. none of these

✅ Correct Answer: 3

The performance of a refrigerator is described by

1. efficiency
2. coefficient of performance
3. both (a) and (b)
4. not described

✅ Correct Answer: 2

The purpose of flywheel in the engines is

1. to smooth out the energy variation
2. to add more weight to engine to work it stable
3. to start engine
4. both (a) and (b)

✅ Correct Answer: 1

The unit of entropy is

1. J.K
2. J/K
3. N.m/sec
4. Kgm2/sec2.K

✅ Correct Answer: 2

Petrol engine is a

1. C.I engine
2. SI engine
3. IC engine
4. all the above

✅ Correct Answer: 4