# HBSE Class 11 Physics Important MCQ Question Answer PDF

Class 11 Physics BSEH Solution for all Chapters Important MCQ Question Answer for Haryana board. CCL Chapter Provide Class 1th to 12th all Subjects Solution With Notes, Question Answer, Summary and Important Questions.

Also Read – HBSE Class 11 Imporant Questions in Videos 2023

HBSE Class 11 Physics Important MCQ Question Answer / grade 11 physics multiple choice questions / class 11 physics objective questions of all chapters Solution.

## HBSE Class 11 Physics MCQ Important Questions With Answer 2023

1. Three balls projected upwards with the same initial speed at angle θ = 30°, 45° and 60° respectively. Let the range of the ball be expressed by Rθ. Then :
(a) R30 > R45 > R60
(b) R60 > R45 > R30
(c) R45 > R30
(d) R45 < R60

Ans – (c) R45 > R30

2. The following particles are moving with the same velocity. The particle with maximum momentum is : Most Important
(a) β-particle
(b) Proton
(c) α particle
(d) Neutron

Ans – (c) α particle

3. In Elastic Collision:
(a) Both momentum and K.E. are conserved
(b) Both momentum and K.E. are not conserved
(c) Momentum is conserved and K.E. is not conserved
(d) Momentum is not conserved and K.E. is conserved

Ans – (a) Both momentum and K.E. are conserved

4. In perfect inelastic collision : Most Important
(a) both momentum and K.E. are conserved
(b) both momentum and K.E. are not conserved
(c) momentum is conserved and K.E. is not conserved
(d) momentum is not conserved and K.E. is conserved

Ans – (c) momentum is conserved and K.E. is not conserved

5. In an elastic collision of two bodies, which of the following physical quantities are conserved ?
(a) Kinetic Energy only
(b) Momentum only
(c) Both Kinetic Energy and Momentum
(d) None of the above

Ans – (c) Both Kinetic Energy and Momentum

6. When the momentum of body is increased by three times, its K.E. becomes : Most Important
(a) Twice
(b) Half
(c) Four times
(d) Nine times

Ans – (d) Nine times

7. Two objects A and B of masses 5 kg and 10 kg respectively are moving with same velocity. The ratio of their momentum will be : Most Important
(a) 1 : 1
(b) 1 : 5
(c) 10 : 5
(d) 1 : 2

Ans – (b) 1 : 5

8. Two objects A and B of masses 2 kg and 10 kg respectively are moving with same velocity. The ratio of their momentum will be: Most Important
(A) 1:1
(B) 1:5
(C) 5:1
(D) 1:25

Ans – (B) 1:5

9. 1 Kilowatt-hour is equivalent to :
(a) 10-7 Joule
(b) 1.6 x 10-19 Joule
(c) 4.186 Joule
(d) 3.6 x 106 Joule

Ans – (d) 3.6 x 106 Joule

10. Kepler third law related to the planetary motion is:
(a) T α r
(b) T α r2
(c) T α r3
(d) T α r3/2

Ans – (d) T α r3/2

11. Pick out the only vector quantity in the following list:
(a) Temperature
(b) Impulse
(c) Current
(d) Charge

Ans – (b) Impulse

12. Which of the following is scalar quantity?
(A) Distance
(B) Displacement
(C) Force
(D) Acceleration

Ans – (A) Distance

13. Which of the following is scalar quantity?
(a) Displacement
(b) Velocity
(c) Work
(d) Force

Ans – (c) Work

14. One end of a string of length L is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle (directed towards the centre) is:
T is the tension in the string. Choose correct alternative.
(a) T
(b) T – mv²/L
(c) T + mv²/L
(d) 0

Ans – (a) T

15. A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to:
(a) t1/2
(b) t3/2
(c) t
(d) t²

Ans – (c) t

16. A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time t is proportional to :
(a) t1/2
(b) t
(c) t3/2
(d) t²

Ans – (c) t3/2

17. In considering motion of an object under the gravitational influence of another object which of the following quantity is conserved :
(a) Angular momentum
(b) Linear momentum
(c) Potential Energy
(d) Kinetic Energy

Ans – (a) Angular momentum

18. A body enters in the gravitational field of the earth from external atmosphere. The potential energy of the earth body system : Most Important
(a) will increase
(b) will decrease
(c) will remain unchanged
(d) none of the above

Ans – (b) will decrease

19. Choose the correct alternative: Most Important
(a) Acceleration due to gravity increases with increasing altitude.
(b) Acceleration due to gravity increases with increasing depth (assume the earth to be a sphere of uniform density.)
(c) Acceleration due to gravity dependent on mass of the body.
(d) The formula GMm( 1/r2 – 1/r1 ) is more accurate than the formula mg(r2–r1) for the difference of potential energy between two points r2 and r1 distance away from the centre of the earth.

Ans – (d) The formula GMm( 1/r2 – 1/r1 ) is more accurate than the formula mg(r2–r1) for the difference of potential energy between two points r2 and r1 distance away from the centre of the earth.

20. Does the escape speed of a body from the earth depend on :
(a) the mass of the body
(b) the location from where it is projected
(c) the direction of projection
(d) the height of the location from where the body is launched

Ans – (d) the height of the location from where the body is launched

21. Which of the following elastic constants is dimensionless ?
(a) Young’s modulus
(b) Poisson Ratio
(c) Bulk modulus
(d) Shear modulus

Ans – (b) Poisson Ratio

22. In which of the following thermodynamics process no heat flow between the system and surroundings ?
(b) Isothermal
(c) Isobaric
(d) Isochoric

23. At what condition real gas approach ideal gas behaviour?
(a) Low pressure and low temperature
(b) Low pressure and high temperature
(c) High pressure and high temperature
(d) High pressure and low temperature

Ans – (b) Low pressure and high temperature

24. According to kinetic theory of gases, pressure exerted by Ideal gas is equal to :
(ρ-density, v- Root mean square speed)
(a) 1/3 ρv²
(b) 1/2 ρv²
(c) ρv²
(d) 3/2 ρv²

Ans – (d) 3/2 ρv²

25. Two forces of 5 Newton each act at a point inclined at 120° with each other. The magnitude of vector addition of these forces is:
(a) Zero
(b) 5 Newton
(c) 5√3 Newton
(d) 10 Newton

Ans – (b) 5 Newton

26. A force of 98 N is just able to move a block of mass 20 kg on a rough horizontal surface. Coefficient of friction is (g = 9.8 m/sec2) :
(a) .4
(b) .5
(c) .6
(d) Zero

Ans – (b) .5

27. Unit of Moment of Inertia in S. I. system is :
(a) kg/meter²
(b) kg-meter²
(c) kg-meter
(d) kg-meter/sec²

Ans – (b) kg-meter²

28. The time of revolution around the earth of Communication Satellite INSAT-11B is:
(a) 12 hours
(b) 24 hours
(c) 48 hours
(d) 30 days

Ans – (b) 24 hours

29. A particle completes semicircular path of radius r. The ratio of distance travelled and displacement of particle will be: Most Important
(a) π/2
(b) π/4
(c) 3π/4
(d) π

Ans – (a) π/2

30. A particle completes semicircular path of radius r, displacement travelled by particle will be :
(a) r/4
(b) r/2
(c) 2r
(d) 4r

Ans – (c) 2r

31. The product of moment of inertia and angular acceleration is called:
(a) Angular momentum
(b) Torque
(c) Force
(d) Work

Ans – (b) Torque

32. If mass M and radius of solid sphere is R, then moment of inertia about diameter is : Most Important
(a) 2/3 MR²
(b) 2/5 MR²
(c) 3/5 MR²
(d) 7/5 MR²

Ans – (b) 2/5 MR²

33. The weight of a body at the centre of the earth is :
(a) Zero
(b) Infinite
(c) Slightly less than at the poles
(d) Slightly less than at the equator

Ans – (a) Zero

34. Which of the following is not unit of energy?
(a) Joule
(b) Calorie
(c) Electron-volt
(d) Kilo-watt

Ans – (d) Kilo-watt

35. Which of the following is Fundamental Unit?
(a) Watt
(b) Newton
(c) Ampere
(d) Joule

Ans – (c) Ampere

36. Which of the following is not Fundamental Unit?
(A) Ampere
(B) Second
(C) Mole
(D) Watt

Ans – (D) Watt

37. There is an error of 3% in the measurement of side of a cube. The percentage error in the calculation of its volume of the sphere will be : Most Important
(a) 9%
(b) 6%
(c) 3%
(d) 1%

Ans – (a) 9%

38. There is an error of 2% in the measurement of side of a cube. The percentage error in the calculation of its volume of the sphere will be : Most Important
(A) 1%
(B) 2%
(C) 3%
(D) 6%

Ans – (D) 6%

39. The dimensional formula [MLT -2] represent :
(a) Force
(b) Torque
(c) Power
(d) Momentum

Ans – (a) Force

40. The dimensional formula (MLT -1) represents :
(A) Force
(B) Torque
(C) Power
(D) Momentum

Ans – (D) Momentum

41. Which friction is minimum?
(a) Static Friction
(b) Limiting Friction
(c) Kinetic Friction
(d) None

Ans – (c) Kinetic Friction

42. Which friction is maximum ?
(A) Static Friction
(B) Limiting Friction.
(C) Kinetic Friction
(D) None

Ans – (B) Limiting Friction.

43. Gravitational force is :
(a) a conservative force
(b) Pseudo force
(c) a non-conservative force
(d) None of the above

Ans – (a) a conservative force

44. Friction force is:
(A) a conservative force
(B) pseudo force
(C) a non-conservative force
(D) centripetal force

Ans – (C) a non-conservative force

45. The linear acceleration a of a body rotating about an Axis with angular acceleration ∝ then :
(a) a = rω
(b) ∝ = ar
(c) a = r∝
(d) r = a∝

Ans – (c) a = r∝

46. The potential energy of a particle in SHM at a distance x from the equilibrium position is :
(a) 1/2 mw²x²
(b) 1/2 mw²a²
(c) 1/2 mw²(a²-x²)
(d) Zero

Ans – (a) 1/2 mw²x²

47. If a process takes place in a system at a constant pressure, the process is known as :
(a) Isochloric
(b) Isothermal
(d) Isobars

Ans – (d) Isobars

48. A body of mass m is moving on a circle of radius r with uniform speed v. The centripetal force on body is : Most Important
(a) mv²/r
(b) mvr
(c) mv/r
(d) mv/r²

Ans – (a) mv²/r

49. The mean kinetic energy of a molecule of any gas at absolute temperature T is proportional to : Most Important
(a) 1/T
(b) √T
(c) T
(d) T²

Ans – (c) T

50. The value of Young’s modulus of elasticity for a perfectly rigid body is : Most Important
(a) Zero
(b) Infinite
(c) 1
(d) 100

Ans – (b) Infinite

51. The distance travelled by a particle is directly proportional to the square of the time taken, the acceleration of the particle is :
(A) Increasing
(B) Decreasing
(C) Zero
(D) Constant

Ans – (D) Constant

52. The linear velocity υ of a body rotating about an axis with angular velocity ω, then :
(A) υ = rα
(C) υ = rω
(B) ω = υr
(D) r = υω

Ans – (C) υ = rω

53. If a process takes place in a system at a constant volume, the process is known as:
(A) Isochoric
(B) Isothermal
(D) Isobaric

Ans – (A) Isochoric

54. The time period of a particle executing simple harmonic motion is:
(A) T = 2π √Displacement/Acceleration
(B) T = 2π √g/Displacement
(C) T = 2π √velocity/Displacement
(D) T = 2π √g x Displacement 