Class 11 PT II Question Paper 2025-26 Physics

CBSE CLASS 11
PT II Question Paper
Session 2025-26

PHYSICS

Exam CBSE Class 11
Subject Physics
Session 2025-26
Document Type PT II Question Paper

Notes · Sample Papers · Previous Year Papers · Mock Tests

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Question Paper
SECOND UNIT TEST
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SESSION: 2025-2026
CLASS: XI MAXIMUM MARKS: 40
SUBJECT: PHYSICS TIME: 1 HOUR 30 MINUTES
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General Instructions:

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(a)�This question paper has total 4 pages that consist of 18 questions in 5 sections.

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emof 8Multiple choice question typecarrying 01 mark each. s
(b)�All questions are compulsory. However, an internal choice is provided in some questions.

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a of 3 Very Short question carrying 02 marks. a
(c)� Section: A consists
(d)�Section: B lconsists
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(e)� Section:aC consists of 4 Short Answer type question carrying 03 marks.
(f)� Section: D consists of 1 source-based/case-based units of assessment of 04 marks with sub-parts.
(g)�Section: E consists of 2 Long Answer type question carrying 05 marks.

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SECTION:A
1. A particle is moving in a circular path of radius aunder the action of an attractive potential 1

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𝑘

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𝑈�− . Its total energy is -

a
�𝑟 �

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(a) Zero
𝑘
(b) �
�𝑎 �
𝑘
(c) − �𝑎 �
�𝑘
(d) −
�𝑎 �
2. Particle A makes a perfectly elastic collision with another particle B at rest. They fly apart in 1
𝑚
opposite direction with equal speeds. The ratio of their masses 𝑚 𝐴 is-
𝐵

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(a)
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la 3. A circular disc of radius 𝑅�and mass �𝑀�has a small circular portiona of
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𝑅
radius cut out from its edge. Considering O is the centre of the disc, the
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position of the centre of mass of the remaining part of the disc with
respect to point O is -
𝑅 𝑅
(a) – � (b) – �
𝑅 𝑅
(c) – (d) – ��

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4. A small mass 𝑚 is attached to a massless string whose other end is fixed 1
at P as shown in figure. The mass is undergoing circular motion in the x-y
plane with centre at O and constant angular speed 𝜔. If the angular
momentum of the system, calculated about O and P are denoted by 𝐿𝑂 and
𝐿𝑃 respectively, then,
(a) 𝐿𝑂 and 𝐿𝑃 do not vary with time
(b) 𝐿𝑂 varies with time while 𝐿𝑃 remains constat
(c) 𝐿𝑂 remains constant while 𝐿𝑃 varies with time
(d) 𝐿𝑂 and 𝐿𝑃 both vary with time
5. An artificial satellite is moving in a circular orbit around the earth with a speed equal to half 1
the magnitude of escape velocity from the earth. The height of the satellite above the earth’s
surface is, [R = Radius of earth],
𝑅 𝑅 �𝑅
(a) (b) (c) R (d)
� � �
6. Which of the following graphs represents the motion of a planet moving about the sun ? 1

Two statements are given, labelled as assertion (A) and Reason(R). Select the correct answer to
these questions from the options given below.
a)� If both Assertion and Reasons are true and Reason is correct explanation of Assertion.
b)� If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
c)� If Assertion is true but Reason is false.
d)� If both Assertion and Reason are false.
7. Assertion(A): The linear momentum of an isolated system remains constant. 1
Reason(R): If there is no external torque on a body about its centre of mass, then the velocity
of centre of mass remains constant.
8. Assertion (A): Escape velocity from Earth is independent of the mass of the escaping object. 1
Reason (R): Gravitational potential energy and kinetic energy both depend on the mass of the
object, which cancels out in velocity calculation.
SECTION: B
9. Power supplied to a particle of mass 2 kg varies with time as P = � 𝑡 � in second. If velocity of 2
�
particle at t=0 is zero. Find the velocity of the particle when time t=2 sec.
OR�
A uniform chain of length 4 m is kept on a table such that a length of 120 cm hangs freely from
the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the
entire chain on the table? �
10. A particle performing uniform circular motion has angular momentum L. What will be the new 2
angular momentum, if its angular frequency is doubled and kinetic energy is halved?
11. “The energy required to launch an orbiting satellite out of earth’s gravitational influence is less 2
than the energy required to project an identical stationary satellite from the same height to send
it out of the earth’s influence.” Establish the statement mathematically.
SECTION:C
12. A force�𝐹 � � −𝐾�𝑦𝑖 � 𝑥𝑗�, where K is a positive constant, acts on a particle moving in the x-y 3
plane. Starting from the origin, the particle is taken along the positive x-axis to the point �𝑎� ��,
and then parallel to the y-axis to the point �𝑎� 𝑎�. Calculate the total work done by the force F
on the particle.

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c13. A massless platform is kept on a light elastic spring. When a ball of smass
m 100 gm is dropped on the platform from a height of 19 cm, the balllastrikes
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the platform, and spring compresses by 1 cm. From what height agshould a
ball be dropped to cause a compression of 2 cm?

14. (a) State the law of conservation of angular momentum. 3
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(b) Considering the Earth as a uniform solid sphere, if it suddenly shrinks to �� of its original

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volume while keeping its mass constant, what will be the new duration of the day?

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OR

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(a) Define radius of gyration.

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(b) A thin rod of mass 2 kg and length 1 m is rotating about an axis passing through its centre
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and perpendicular to its length. Calculate its radius of gyration.
15. Two satellites of masses 𝑚 and �𝑚 are revolving around a planet of
mass 𝑀 with different speeds in orbits of radii 𝑟 and �𝑟 respectively as
shown in the figure. Find the ratio of minimum and maximum forces
on the planet due to the satellites.

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SECTION:D

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16. Read the following passage and answer the following questions: 4

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A group of students were performing an activity of measuring mass of a uniform rod of length
1m. On the surface of the rod length is calibrated in mm. By using a knife edge, they tried to
balance the rod in equilibrium at 60 cm mark. They successfully did it by putting a 20 g weight
at 90 cm mark. From the outcome they calculated the mass of the scale by using principle of
moments. They continued to perform the same activity by changing the weights and also the
position of balance points by shifting the knife edge. They got a set of data from this activity
and calculated the mass of the scale.

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I. The mass of the scale calculated by the students in their first set up was,

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(a) 50 g

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(b) 100 g

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(c) 60 g

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(d) 80 g
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(b) rotational equilibrium
(c) both translational and rotational equilibrium
(d) neither translational nor rotational equilibrium
III. Turning effect of force is produced by,
(a) tangential component of force.
(b) radial component of force.

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(c) both tangential and radial components of force.

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(d) either tangential or radial component of force.

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OR
The moment of a force about a point depends on:
(a) the force only
(b) the perpendicular distance from the point to the line of action of force
(c) the angle between force and the lever arm
(d) both (b) and (c)
IV. In the above mentioned set up if the knife edge is shifted to 50 cm mark keeping the 20 g
weight at 90 cm, then to balance the scale a 50 g weight must be kept at the mark
(a) 36 cm
(b) 34 cm
(c) 16 cm
(d) 20 cm
SECTION: E
17. (a)� A body tied to one end of a string is made to revolve in a vertical circle. Derive the 5
expression for the speed of the body and tension in the string at any point.
(b)�In a circus, the diameter of globe of death is 20 m. From what minimum height must a
cyclist start in order to go round the globe successfully?
OR
(a) Prove work-energy theorem for a variale force.
(b) Aparticle moves along 𝑋 − �𝑎𝑥𝑖𝑠 under
variable force acting along the same axis. The
relationship between the force and displacement
is shown in the graph.
(i) Find out the total work done by that force.
(ii) If the same graph demonstrates the force
acting along 𝑌�𝑎𝑥𝑖𝑠 while displacement of
particle is still restricted along�𝑋 − �𝑎𝑥𝑖𝑠, then
discuss the work done by this new force.
18. (a) State Kepler’s first and second law of planetary motion. 5
(b) Show graphically the variation of areal velocity of a planet with respect to time.
(c) The period of revolution of an artificial satellite just above the surface of earth (h<<R) is T
and density of earth is ρ. Prove that ρT2 is a universal constant.
OR
(a) Show that the minimum velocity required for an object to escape the earth’s gravitational
field from the surface of earth is �𝑔𝑅 (symbols have their usual meaning).
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(b) The gravity of moon is times of earth. It is weaker than earth but it has a finite non zero
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value. But still unlike earth it has no atmosphere. Explain.

*****

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