In this blog, I will share the Polytechnic 1st Year Physics Question Papers. if you are interested to know the Polytechnic 1st Year Physics Question then read the blog carefully.

## Polytechnic 1st Year Physics Question Papers

Physics Polytechnic College Diploma 1st Year Question Paper

### Answare Any 10 Parts [10*1]

1. Which of the following does not have dimension ML-¹T²

(a)Pressure.

(b)Stress.

(c)Power.

2. The scalar product of two vectors is a———-.

(a)Vector.

(b)Scalar.

(c)Both.

3. Write the dimension of the Planck constant.

4. Write the unit of coefficient of thermal conductivity.

5. Velocity of a particle is given by v= at+ b/t+c write the dimension of constant.

6. Two mutually perpendicular vectors P^{->} and Q^{->} have magnitudes 3 and 4 respectively. Determine the magnitude of vector P^{->}– Q^{->}.

7. write the relation between force and linear momentum.

8. Two bodies of equal masses, moving on a circular path with equal speed having radius rand respectively. The ratio of their centripetal forces is.

(a)r_{2}/r_{1}

(b)r_{1}/r_{2}

(c)r_{2}^{2}/r_{1}

10. Write the relationship between the momentum of inertia and angular momentum.

11. If the earth’s radius is decreased by 1% but its mass remains the same, its gravitational acceleration will increase.

(a)Decrease

(b)Increases

(c)Remain Same

12. Write the statement of the zeroth law of thermodynamics.

### Attempt Any 5 [5*2]

13. The displacement of any particle x depends on time t is given by equation.x = at + b² where x is in meters and is in seconds. Find the units of a and b.

14. Write the name of any two errors in measurement.

15. Write the number of significant figures in 3.7652.

16. Define terminal velocity and write Stoke’s law.

17. A body is displaced by applying 10 Newton’s force. The displacement in the direction of force is 5cm. Calculate the work done.

18. The error in measurement of the length and breadth of a rectangle is 5% and 3% respectively. Calculate the error in the measurement of the area of a rectangle.

19. Convert 1 Joule into Calorie.

### Attempt Any Two-Part [2*5]

20. Define centripetal acceleration. Derive its expression in terms of linear velocity and radius.

21. Define the kinetic energy of rotation. A body of mass 10 kg is rotating in a horizontal circle with a rope of 3 meters with 2 rotations per second. Calculate the kinetic energy of rotation.

22. Define torque. Obtain expression between torque and angular momentum. Show that if the net external torque acting on a body is zero, then its angular momentum will be conserved.

### Attempt Any Two-Part [2*5]

23. Define acceleration due to gravity. Explain how its value changes by going upward and downwards to the earth’s surface.

24. Define elasticity. Write Hook’s law and define various modulie of elasticity.

25. Write the statement of the second law of thermodynamics. A Carnot’s heat engine has a source temperature of 127°C and a sink temperature. Calculate its efficiency.

### Attempt Any Two-Part [2*5]

26. Define the coefficient of viscosity. Write its unit and dimension. Also, explain the effect of temperature on

the coefficient viscosity of liquids and gases.

27. Describe the apparent weight of a person in a lift. What is the condition of weightlessness?

28. A car of mass 1200kg moving at 22 meters/ second is brought to rest over a distance of 50 meters. Calculate the braking force to stop the car.

## Physics Polytechnic College Diploma 1st Year Question Paper

Physics Polytechnic College Diploma 1st Year Question Paper is important because many of the students have just passed the 10th class and have been admitted to the diploma. They do not know the exam pattern and question difficulty this question helps the student to secure a good mark.

Physics Polytechnic College Diploma 1st Year Question Paper | Click Here |

## Physics Polytechnic College Diploma 1st Year Question Paper In Chennai

### MCQ Question

1. One newton meter is the unit of

(a) momentum

(b) power

(c) Torque

(d) none of these

2. What is the significant figure in 6.0023

(a) 2

(b) 3

(c) 6

(d) none

3. Light year is the unit of

(a) time

(b) distance

(c) speed

(d) none

4. The number of basic units required to cover all physical quantities in science and engineering is.

(a) 7

(b) 5

(c) 6

(d) 3

5. The unit of coefficient of thermal conductivity is.

(a) watt per kelvin – m

(b) watt m

(c) j/s

(d) ampere

6. The apparent weight of the body fall freely under gravity is .

(a) 0

(b) indefinite

(c) 9.8gm

(d) none of these

7. Which law of Newton’s law of motion is called law of inertia :

(a) Newton’s first law of motion

(b) Newton’s second law of motion

(c) Newton’s third law of motion

(d) none of these

8. Which of the following is equal to the change in momentum of the body:

(a) Energy

(b) impulse

(c) displacement

(d) none

9. The unit of measuring moment of a moving

body is :

(a) Ms^-1

(b) Kgms^-1

(c) kgms^-2

(d) none of these

10. Newton second law of motion connects

(a) amplitude of vibrating body

(b) change of momentum and velocity

(c) rate of change of momentum and force

(d) rate of change of force and momentum

11. If the mass of the body is halved and its velocity is doubled, the kinetic energy of the body will

(a) doubled

(b) four times

(c) eight times

(d) none

12. The car is running at a speed of 15 km/h while another similar car is moving at a speed of 30 km/h. Their kinetic energies are in the ratio:

(a) 1:2

(b) 2

(c) 1:4

(d) 4:1

13. A man pushes a wall and fails to displace it. He does

(a) negative work

(b) positive work but not maximum work

(c) no work at all

(d) maximum positive work

14. The work done by a force on a body will be positive if

(a) the body does not move

(b) the body moves perpendicular to the the direction of applied force

(c) the body moves along the direction of applied force

(d) the body moves opposite to the direction of applied force

15. When the velocity of a body is doubled, its kinetic energy

(a) becomes four times

(b) is doubled

(c) becomes half

(d) remains the same

16. A body of mass 1.3 kg^m^2 rotating with an angular velocity of 2 rad/s has the same kinetic energy as a mass of 12 kg moving with a velocity of

(a) 1 m/s

(b) 2 m/s

(c) 4 m/s

(d) 8 m/s

17. Moment of inertia depends on

(a) distribution of particles

(b) mass

(c) position of the axis of rotation

(d) all of these

18. Calculate the M.I of a thin uniform ring about an axis tangent to the ring and in a plane of the ring, if its M.I about an axis passing through the centre and perpendicular to the plane is 4 kgm^2

(a) 12 kg m²

(b) 3 kg m²

(c) 6 kg m²

(d) 9 kg m²

19. If a body is rotating about an axis, passing through its centre of mass then its angular momentum is directed along its

(a) radius

(b) tangent

(c) circumference

(d) axis of rotation

20. A solid cylinder of mass 20 kg, has length 1 meter and radius 0.5m then its momentum of inertia in kgm² about its geometrical axis is

(a) 2.5

(b) 5

(c) 1.5

(d) 3

21. Hook’s law essentially defines.

(a) stress

(b) strain

(c) yield point

(d) elastic limit

22. The maximum value of stress for which Hook’s law holds good is called

(a) elasticity

(b) strain

(c) elastic limit

(d) young’s modulus

23. Young’s modulus for a perfectly plastic body’s

(a) zero

(b) infinity

(c) one

(d) finite

24. Steel is more elastic than rubber because for a given stress, strain produced in steel is

(a) equal to that in rubber

(b) greater than in rubber

(c) less than in rubber

(d) none of these

25. Which one of the following substances possesses the highest elasticity?

(a) rubber

(b) glass

(c) steel

(d) copper

26. Thermal conductivity of a material depends upon

(a) temperature difference

(b) area

(c) thickness

(d) none of these

27. The transfer of heat from one place to another without the help of any medium is called.

(a) conduction

(b) convection

(c) radiation

(d) none

28. The Relation b/w 𝜶,𝜷, and 𝜸 is

(a) 𝛼: 𝛽: 𝛾= 1:1:1

(b) 𝛼: 𝛽: 𝛾= 1:2:3

(c) 𝛼: 𝛽: 𝛾=3:2:1

(d) none of these

29. The process in which a metal rod is heated at one end, and the heat is transferred to another end is called

(a) conduction

(b) convection

(c) radiation

(d) none

30. The SI unit of the coefficient of thermal conductivity is

(a) watt – kelvin meter

(b) joule

(c) watt/m-k

(d) joule/second

### Long Question :

31. Define the various modes of heat transfer, giving one example of each.

32. Write the laws of thermal conductivity and define the coefficient of thermal conductivity.

33. Define expansion in solids. Why is a small gap always left between iron rails in railway lines?

34. Define the following terms:

a) Plasticity

b) Elasticity

c) Deforming force

d) Restoring force

35. Define stress, strain, and elastic limit. State Hook’s law.

36. Explain translational motion and rotational motion with examples.

37. Define moment of inertia and radius of gyration.

38. State the parallel and perpendicular axis theorem.

39. Define work, including its SI unit and dimensions.

40. A person is holding a bag by applying a force of 15 N. He moves forward and covers a horizontal distance of 8 m, then climbs up and covers a vertical distance of 10 m. What is the work done by him?

41. Explain the concepts of scalar and vector quantities.

42. Differentiate between scalar and vector quantities.

43. What is a unit? What are the requirements of standard units?

44. Write about different systems of units and explain the SI system of units.

45. Define physical quantity and discuss fundamental and derived quantities. Provide examples.