SET-9 Physics MCQs | Objective Type Questions

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Physics MCQs | Objective Type Questions SET-9

1.What is wavelength of a wave?

[A] square of the distance between two points having the same phase
[B] maximum distance between two points having the same phase
[C] minimum distance between two points having the same phase
[D] None of the above

Answer: C [minimum distance between two points having the same phase]

Notes:
The minimum distance between two points having the same phase is called the wave length of the wave. It is represented by λ.

2.What is the S.I unit of the propagation constant?

[A] radian metre
[B] radian per metre
[C] radian per second
[D] radian per centimetre

Answer: B [radian per metre]

Notes:
The SI unit of propagation constant is radian per metre. It is also known as the angular wave number and represented by K.

3.In which of the following cases Doppler effect is not seen?

[A] When the velocity of source and listener is equal to or greater than the sound velocity
[B] When source and listener moves in opposite direction
[C] When the velocity of source and listener is less than the sound velocity
[D] None of the above

Answer: A [When the velocity of source and listener is equal to or greater than the sound velocity]

Notes:
If the velocity of source and listener is equal to or greater than the sound velocity then Doppler effect is not seen.

4.Which of the following is correct about compressions in sound wave?

[A] compressions are regions of low pressure and low density
[B] compressions are regions of high pressure and low density
[C] compressions are regions of high pressure and high density
[D] compressions are regions of low pressure and high density

Answer: C [compressions are regions of high pressure and high density]

Notes:
Compressions are the regions where particles are crowded together and represented by the upper portion of the curve. Compressions are regions where density as well as pressure is high.

5.What do we call the energy transferred between two systems by virtue of temperature difference?

[A] Kinetic Energy
[B] Potential Energy
[C] Heat Energy
[D] Mechanical Energy

Answer: C [Heat Energy]

Notes:
Heat is the form of energy transferred between two (or more) systems or a system and its surroundings by virtue of temperature difference.

6.Which of the following represents Boyle’s law?

[A] Pressure = Volume when temperature is constant
[B] Pressure x Volume = constant when temperature is constant
[C] Pressure =2 x Volume when temperature is constant
[D] None of the above

Answer: B [Pressure x Volume = constant when temperature is constant]

Notes:
When temperature is held constant, the pressure and volume of a quantity of gas are related as PV = constant. This relationship is known as Boyle’s law

7.What is the S.I unit of specific heat capacity?

[A] J kg^-2 K^-1
[B] J kg^-1 K¹
[C] J kg^-1 K^-2
[D] J kg^-1 K^-1

Answer: D [J kg^-1 K^-1]

Notes:
The specific heat capacity is the property of the substance which determines the change in the temperature of the substance (undergoing no phase change) when a given quantity of heat is absorbed (or given off) by it. The SI unit of specific heat capacity is J kg ¹ K^{– 1}.

8.What is meant by Calorimetry?

[A] Measurement of heat
[B] Measurement of temperature
[C] Measurement of specific heat capacity
[D] None of the above

Answer: A [Measurement of heat]

Notes:
Calorimetry means measurement of heat. A device in which heat measurement can be done is called a calorimeter.

9.How many joules are there in one calorie?

[A] 3.186 J
[B] 4.186 J
[C] 5.186 J
[D] 6.186 J

Answer: B [4.186 J]

Notes:
There are 4.186 J in once calorie.

10.Which of the following is the efficiency of a Carnot engine(a = Temperature of source, b=Temperature of sink)?

[A] 1 – b/a
[B] 1 – a/b
[C] 1 + b/a
[D] 1 + a/b

Answer: A [1 – b/a]

Notes:
Carnot engine is a reversible engine operating between two temperatures T1 (source) and T2 (sink). The Carnot cycle consists of two isothermal processes connected by two adiabatic processes. The efficiency of a Carnot engine is given as: 1 – T2/T1