Monthly Archives: December 2021

In This Post we are  providing Chapter-14 Oscillations NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON OSCILLATIONS

Question 1: Select the incorrect statement(s) from the following.

I. A simple harmonic motion is necessarily periodic.
II. A simple harmonic motion may be oscillatory
III. An oscillatory motion is necessarily periodic

• a) II and III
• b) I and II
• c) I only
• d) I and III

Answer: II and III

Question 2: Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel, the motion of the particle is

• a) oscillatory
• b) simple harmonic
• c) parabolic
• d) non-periodic

Answer: oscillatory

Question 3: The graph plotted between the velocity and displacement from mean position of a particle executing SHM is

• a) ellipse
• b) straight line
• c) circle
• d) parabola

Answer: ellipse

Question 4: A body executing linear simple harmonic motion has a velocity of 3 m/s when its displacement is 4 cm and a velocity of 4 m/s when its displacement is 3 cm. What is the amplitude of oscillation ?

• a) 5 cm
• b) 7.5 cm
• c) 10 cm
• d) 12.5 cm

Answer: 5 cm

Question 5: 

Assertion : A particle executing simple harmonic motion comes to rest at the extreme positions .

Reason : The resultant force on the particle is zero at these positions

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question 6: The total energy of a particle executing S.H.M. is proportional to

• a) square of amplitude of motion
• b) velocity in equilibrium position
• c) frequency of oscillation
• d) displacement from equilibrium position

Answer: square of amplitude of motion

Question 7: Which of the following is true about total mechanical energy of SHM ?

• a) It is never zero
• b) It is always zero
• c) It is zero at extreme position
• d) It is zero at mean position.

Answer: It is never zero

Question 8: 

Assertion : The graph of total energy of a particle in SHM w.r.t. position is a straight line with zero slope.

Reason : Total energy of particle in SHM remains constant throughout its motion.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct.

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question 9: A body executes simple harmonic motion. The potential energy (P.E.), the kinetic energy (K.E.) and total energy (T.E.) are measured as a function of displacement x. Which of the following statement is true?

• a) K.E. is maximum when x = 0.
• b) T.E. is zero when x = 0.
• c) K.E. is maximum when x is maximum
• d) P.E. is maximum when x = 0.

Answer: K.E. is maximum when x = 0.

Question 10: The total energy of the particle executing simple harmonic motion of amplitude A is 100 J. At a distance of 0.707 A from the mean position, its kinetic energy is

• a) 50 J
• b) 100 J
• c) 12.5 J
• d) 25 J

Answer: 50 J

Question 11: When the displacement of a particle executing simple harmonic motion is half of its amplitude, the ratio of its kinetic energy to potential energy is

• a) 3 : 1
• b) 1 : 2
• c) 2 : 1
• d) 1 : 3

Answer: 3 : 1

Question 12: If the maximum velocity and acceleration of a particle executing SHM are equal in magnitude, the time period will be

• a) 6.28 sec
• b) 12.56 sec
• c) 3.14 sec
• d) 1.57 sec

Answer: 6.28 sec

Question 13: A simple pendulum oscillates in air with time period T and amplitude A. As the time passes

• a) T remains same and A decreases
• b) T decreases and A is constant
• c) T increases and A is constant
• d) T and A both decrease

Answer: T remains same and A decreases

Question 14: Which of the following will change the time period as they are taken to moon?

• a) A simple pendulum
• b) A torsional pendulum
• c) A physical pendulum
• d) A spring-mass system

Answer: A simple pendulum

Question 15: For an oscillating simple pendulum, the tension in the string is

• a) maximum at mean position
• b) constant throughout the motion
• c) cannot be predicted
• d) maximum at extreme position

Answer: maximum at mean position

In This Post we are  providing Chapter-13 Kinetic Energy NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON KINETIC ENERGY

Question 1: In kinetic theory of gases, it is assumed that molecules

• a) have same mass but negligible volume
• b) have different mass as well as volume
• c) have same volume but mass can be different
• d) have same mass but can have different volume

Answer: have same mass but negligible volume

Question 2: The internal energy of a gram-molecule of an ideal gas depends on

• a) pressure alone
• b) volume alone
• c) temperature alone
• d) both on pressure as well as temperature

Answer: pressure alone

Question 3: The phenomenon of Browninan movement may be taken as evidence of

• a) kinetic theory of matter
• b) electromagnetic theory of radiation
• c) corpuscular theory of light
• d) photoelectric phenomenon

Answer: kinetic theory of matter

Question 4: According to kinetic theory of gases, at absolute zero temperature

• a) molecular motion stops
• b) liquid hydrogen freezes
• c) liquid helium freezes
• d) water freezes

Answer: molecular motion stops

Question 5: At a given temperature the force between molecules of a gas as a function of intermolecular distance is

• a) first decreases and then increases
• b) always increases
• c) always decreases
• d) always constant

Answer: first decreases and then increases 

Question 6: For Boyle’s law to hold, the gas should be

• a) perfect and of constant mass and temperature
• b) real and of constant mass and temperature
• c) perfect and constant temperature but variable mass
• d) real and constant temperature but variable mass

Answer: perfect and of constant mass and temperature

Question 7: Boyle’ law is applicable for an

• a) isothermal process
• b) isochoric process
• c) adiabatic process
• d) isobaric process

Answer: isothermal process

Question 8: The deviation of gases from the behavior of ideal gas is due to

• a) attraction of molecules
• b) absolute scale of temp
• c) covalent bonding of molecules
• d) colourless molecules

Answer: attraction of molecules

Question 9: In a mixture of gases at a fixed temperature

• a) heavier molecule has lower average speed
• b) lighter molecule has lower average speed
• c) heavier molecule has higher average speed
• d) None of these

Answer: heavier molecule has lower average speed

Question 10: The average kinetic energy of gas molecules depends upon which of the following factor?

• a) Temperature of the gas
• b) Nature of the gas
• c) Volume of the gas
• d) None of these

Answer: Temperature of the gas

Question 11: The temperature of a gas is a measure of

• a) the average kinetic energy of the gaseous molecules
• b) the average potential energy of the gaseous molecules
• c) the average distance between the molecules of the gas
• d) the size of the molecules of the gas

Answer: the average kinetic energy of the gaseous molecules

Question 12: In the isothermal expansion of 10g of gas from volume V to 2V the work done by the gas is 575J. What is the root mean square speed of the molecules of the gas at that temperature?

• a) 499m/s
• b) 532m/s
• c) 520m/s
• d) 398m/s

Answer: 499m/s

Question 13: In a diatomic molecules, the rotational energy at a given temperature

• a) obeys Maxwell’s distribution
• b) have the same volue for all molecules
• c) equals the translational kinetic energy for each molecule
• d) None of these

Answer: obeys Maxwell’s distribution

Question 14: Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will.

• a) remains the same
• b) decrease for some and increase for others
• c) decrease
• d) increase

Answer: remains the same

Question 15: Pressure exerted by a gas is

• a) directly proportional to the density of the gas
• b) directly proportional to the square of the density of the gas
• c) inversely proportional to the density of the gas
• d) independent of density of the gas

Answer: directly proportional to the density of the gas