# HBSE Class 11 Physics Question Paper 2022 Answer Key

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HBSE Class 11 Physics Question Paper 2022 Answer Key

Objective Questions
Q1(1). Which of the following is Fundamental Unit ?
(A) Watt
(B) Newton
(C) Ampere
(D) Joule

Answer – (C) AmpereThere are 7 Fundamental Unit – Length – meter (m)

Time – second (s)

Amount of substance – mole (mole)

Electric current – ampere (A)

Temperature – kelvin (K)

Luminous intensity – candela (cd)

Mass – kilogram (kg)

Q2. 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:

(A) 9%

(B) 6%

(C) 3%

(D) 1%

Error Formula,  3Δr/r = 3 × 3% = 9%

Q3. The dimensional formula [MLT-²] represent :

(A) Force

(B) Torque

(C) Power

(D) Momentum

Force = ma = M¹L¹T-²

Torque = Fs = M¹L²T-²

Power = Fv = M¹L²T-³

Momentum = mv = M¹L¹T-¹

Q4. A particle completes semicircular path of radius r, displacement travelled by particle will be :

(A) r/4

(B) r/2

(C) 2r

(D) 4r

Q5. An object is moving with a constant acceleration. Its velocity time graph is :

Q6. Which of the following is scalar quantity ?

(A) Displacement

(B) Velocity

(C) Work

(D) Force

Scalar quantity has only magnitude but vector quantity has magnitude and direction.

Q7. 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 :

(A) 1 : 1

(B) 1 : 5

(C) 10 : 5

(D) 1 : 2

Answer – (D) 1 : 2

Momentum = P = mv

P1/P= m1v/m2v = 5/10 = 1/2  or  1 : 2

Q8. Which Friction is minimum ?

(A) Static Friction

(B) Limiting Friction

(C) Kinetic Friction

(D) None

Rolling friction is minimum & limiting friction is maximum.

Q9. Gravitational force is :

(A) a conservative force

(B) Pseudo force

(C) a non-conservative force

(D) None of the above.

Answer – (A) a conservative force

Q10. The linear acceleration(a) of a body rotating about an axis with anguler acceleration α, then :

(A) α = rω

(B) α = ar

(C) a = rα

(D) r = aα

Answer – (C) a = rα

Q11. The potential energy of a particle in SHM at a distance x from the equilibrium position is :

(A) ½mw²x²

(B) ½mw²a²

(C) ½mw²(a²-x²)

(D) Zero

Q12. If a process takes place in a system at a constant pressure, the process is known as :

(A) isochoric

(B) isothermal

(D) isobaric

Q13. A body of mass m is moving on a circle of radius r with uniform speed v. The centripetal force on body is :

(A) mv²/r

(B) mvr

(C) mv/r

(D) mv/r²

Q14. In perfect inelastic 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

Answer – (C) momentum is conserved and K.E. is not conserved

Q15. If mass M and radius of solid sphere is R, then moment of inertia about diameter is :

(A) ⅔MR²

(B) ⅖MR²

(C) ⅗MR²

(D) 7/5MR²

Q16. The mean kinetic energy of a molecule of any gas at absolute temperature T is proportional to :

(A) 1/T

(B) √T

(C) T

(D) T²

Q17. The value of Young’s modulus of elasticity for a perfectly rigid body is :

(A) Zero

(B) infinite

(C) 1

(D) 100

Q18. A body enters in the gravitational field of the earth from external atmosphere. The potential energy of the earth-body system :

(A) will increase

(B) will decrease

(C) will remain unchanged

(D) None of the avove

Q19. ……….. is 1/273.16 part of thermodynamic temperature of the triple point of water.

Q20. The angle of projection for which a projectile cover the maximum horizontal range is ……..

Q21. The rate of doing work by a machine is called …………. of the machine.

Q22. The value of …………. is determined to be 6.67 x 10-¹¹ Newton-metre²/kg².

Q23. By using ball bearings, sliding friction can be converted into ……….. friction.

Q24. The number of degrees of freedom of a molecule of a diatomic gas is …………

Q25. When a body being acted by an external periodic force, vibrates with the frequency of the force, then the vibrations of the body are called ………… vibrations.

Q26. 4.18 Joule of work is equivalent to …………. calories of heat.

Q27. The angle inside the liquid between the tangent to the solid surface and the tangent to the liquid surface at the point of contact is called ……….. for that pair of solid and liquid.

Q28. The equation of a simple harmonic motion is y = 10sin100πt. Give value of amplitude of oscillation.

Answer : Amplitude (A) = 10

Q29. When 200 Joule of heat is given to a gaseous system, then internal energy increases by 60 Joule. Find the work done by the system.

Answer : Work done = 200 – 60 = 140 Joule

Q30. Write relation between coefficient of linear expansion (α) and coefficient of surface expansion (β) of a solid material.

Q31. If a vector C is multiplied by a scalar n, what will be the resultant vector.

Answer : Result Vector = Cn

Q32. What is relation between coefficient of static friction and the angle of heating friction ?

Q33. What is time-period of Geo-stationary satellite ?

Q34. Write down the formula for work done in rotatory motion.

Q35. How many erg are there in 1 Joule ?

Answer : 1 Joule = 10⁷ erg

Subjective Questions

Q2. Check the equation v = u+ at by the method of dimensions.

Where v = final velocity, u= Initial velocity, a = acceleration, t= time.

LHS : v = L¹T-¹

RHS : u + at = L¹T-¹ + L¹T-²(T) = L¹T-¹ + L¹T-¹ = L¹T-¹

As per addition rule in dimensions, only quantities having similar dimensions can be added.

So, LHS = RHS

Q3. Draw velocity-time graph of a particle executing simple harmonic motion.

Ans.

Q4. Write Stoke’s Law.

Ans. Stoke’s Law states that the force that retards a sphere moving through a viscous fluid is directly proportional to the velocity and the radius of the sphere, and the viscosity of the fluid.

In Stokes’s law, the drag force F acting upward in resistance to the fall is equal to 6πrηv, in which r is the radius of the sphere, η is the viscosity of the liquid, and v is the velocity of fall.

Q5. The applied force F = 3i + 4j – 5k on a particle produces displacement S = 5i + 4j + 3k. Calculate work done by the force.

Answer : W = F.S = (3i + 4j -5k).(5i + 4j + 3k)

= 3×5 + 4×4 – 5×3 = 15 + 16 – 15 = 16 Joule

Q6. Write down the postulates of kinetic theory of gases.

Answer – Postulates of kinetic theory of gases :

(i) A gas consist of a very large number of atoms.

(ii) The molecules of a gas are in a state of incessant random motion.

(iii) The size of the gas molecule in very small as compared to the distance between them.

(iv) The molecules do not exert any force of attraction or repulsion on each other.

(v) The collisions of the molecules with themselves and with the walls of the vessel are perfectly elastic.

Q7. Obtain the formula for the escape velocity of a body from the Earth.

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