HBSE Class 11 Sample Paper 2024 Answers Physics

HBSE
MODEL PAPER
2024
Practice Papers
MODEL PAPERS
Marking Scheme
ANSWER KEY

Class: XI
SESSION:2023-2024
MARKING SCHEME
HBSE SAMPLEQUESTIONPAPER(THEORY)
SUBJECT:PHYSICS

Q.no Marks
SECTIONA
1 (iii) 8h/9 1
2 (ii) zero 1
3 (ii) 45 1
4 (iii) 7200 N 1
5 (i)Opposing force 1
6 (iv) pascal 1
7 (i) 0 1
8 (i)F 1

9 (ii) B 1
10 (iii) zero 1
11 (iv) 107 Nm-2 1
12 (iii) Hook’s law 1
13 (iv) 8Q 1
14 (i)J/kg 1
15 (a) 1
16 (d) 1
17 (d) 1
18 (b) 1
SECTIONB
19

½

½

½

½

1

20

½

½

½

½

21 A conservative force exists when the work done by that force on 2
an object is independent of the object's path. Instead, the work
done by a conservative force depends only on the end points of
the motion. An example of a conservative force is gravitational
force, electrostatic force.

Or
1
Elastic potential energy is energy stored as a result of
applying a force to deform an elastic object.
Elastic potential energy=²³½ 1/2 kx2 1

2

22 1
A collision in which there is absolutely no loss Of kinetic
energy is called elastic collision.
Characteristics: (any two)
½
1. The linear momentum is conserved.
2. Total energy of the system is conserved.
3. Kinetic energy is conserved. ½
4. Forces involved during elastic collisions must be
conservative forces.
OR
The ratio of relative velocity after collision to the relative velocity 2
between two objects before their collision is known as the
coefficient of restitution.
23 1+1
Pascal's law is any pressure applied to a fluid inside a closed
system will transmit that pressure equally in all directions
throughout the fluid.
Hydraulic brake,Hydraulic jack
24 As temperature levels change, so does the air pressure in
your tyres. It's the same as when you drive at higher
speeds for an extended period: the tyre warms, and the air
within expands and increases pressure 2

3

25

1

1

SECTIONC
26
1

1

1

27

1

4

1

1

5

1.5

1.5

28
The moment of inertia of a rigid composite system is the sum of the 1
moments of inertia of its component subsystems (all taken about
the same axis).

2

6

29 1
1
1

OR 1
Escape velocity is the minimum velocity required by a body to be
projected to overcome the gravitational pull of the earth.
2
Derivation of escape velocity

7

30 An isothermal process is a thermodynamic process, in which the 1
temperature of the system remains constant:
ΔT=0.

1

1

8

SECTION D

31

1

1

1

1

9

OR
The parallelogram law of vector addition states that if two vectors are
considered to be the two adjacent sides of a parallelogram with their 1
tails meeting at the common point, then the diagonal of the
parallelogram originating from the common point will be the resultant
vector. 4
Derivation for resultant

32 2
Newton's second law of motion states that “Force is equal to the rate
of change of momentum. For a constant mass, force equals mass
times acceleration.

10

1

1

1

OR
1

11

2

2

33.

1

1

2

12

Bernoulli's equation LIMITATION (ANY TWO)
½+1/2
[1] the flow must be steady, i.e., the flow parameters (velocity,
density, etc...) at any point cannot change with time [2] the flow
must be incompressible – even though pressure varies, the density
must remain constant along with a streamline and [3] friction by
viscous forces must be negligible.
OR
Terminal velocity is defined as the highest velocity attained by an 1
object falling through a fluid

Derivation for terminal velocity 4

13

SECTION E
34 1
-23
1. 1.38x10 joule per Kelvin.
2. P=1/3pv2 1
The law of energy equipartition states 2
3.
that the total energy for every dynamic
system in thermal equilibrium is evenly
shared among the degrees of freedom.
Or
Degree of Freedom

35 1. b) longitudinal waves 1

2. c) Any medium even through vacuum 1

3. a longitudinal wave, the medium or the channel moves 2
in the same direction with respect to the wave. Here, the
movement of the particles is from left to right and forces
other particles to vibrate. In a transverse wave the
medium or the channel moves perpendicular to the
direction of the wave.

OR

Proof of V = 

14