Class 11 Revision Test 2024-25 Question Paper Physics

VANASTHALI PUBLIC SCHOOL
SESSION: 2024-25
REVISION TEST
CLASS-XI
SUBJECT- PHYSICS

TIME: 3 Hrs, M.M:70
General Instructions:
There are 33 questions in all, All questions are compulsory.
i. This question paper has five sections: Section A, Section B, Section C, Section Dand Section E.
ii. Allthe sections are compulsory.
iv. Section Acontains sixteen questions, twelve MCQ and four Assertion Reasoning based of 1mark each,
Section Bcontains five questions of two marks each, Section Ccontains seven questions of three marks
each, Section Dcontains two case study based questions of four marks each and Section E contains
three long answer questions of five marks each.
V. There is no overall choice. However, an internal choice has been provided in one question in Section
B, one question in Section C, one question in each CBQ in Section Dand all three questions in Section
E. You have to attempt only one of the choices in such questions.

SECTION-A

What are the dimensions of in the relation F = AVz+ Bt², whereF is the force, xis [1]
distance and t is time?

a) [LT²] b) [ ML?T-2]
e) [LT²]
The time period T of a small drop of liquid (due to surface tension) depends on densityp [1]
radius r and surface tension S. The relation is:
a) T e b) T « prS
pr

9T« d)T« ()
3 Velocity of a body on reaching the point from which it was projected upwards, is: [1]
a) v = 0.5 u b) v = 0
c) v=u d) v=2u

Page 1 of 8

The velocity of aparticle moving along a straight line is descnbed by cquation v= 12- 3
where x is in metre and t in s. The retardation of the particle when its velocity becomes zero,

a) 24 ms2 b) 0
c) 12 ms2 ) 6 ms-?
The vectors and Bare such that |À+ B=Ã- B|.The angle between the two vectors is
a) 45°
b) 75°
c) 60 d) 90°
Aprojectile is fired a veloaty of 150 meters per second at an angle of 30 degrees with the [1]
honzontal What is the magnitude of the vertical component of the velocity at the time the
projectile is fired?
a) 225 m's b) 75 m/s
c) 150 m's d) 130 m/s
7 Amarble block of mass 2 kg lying on ice when given a velocity of6 m/s is stopped by friction [11
in 10 s Then the coefiient of friction is
a) 0 03 5)0.06 c) 0.02 d) 0.01
Abody moves a distance of 10 malong a straight line under the action of a 5Nforce. If the (1]
work done is 25 J, then angle between the force and direction of motion of the body is
a) 75° b) 450
e) 60 d) 30°
If force acts on a body, whose line of action does not pass through its centre of gravity, then
the body will experience
a) linear acceleration b) angular acceleration
«) both angular acceleration and linear acceleration d) Non - linear acceleration
10 Abody of weight 72 Nmoves from the surface of earth at a height half of the radius of carth, [1]
then gravitational force exerted on it will be:
a) 36 N b) 144 N
c) 50 N d) 32 N
11 Asteel wire 10 mlong and 105 m² in crosssectional area elongates by 0.01 munder a [1]
tension of 2500 N. Young's modulus for steel from this data is computed as
a) 2.5x 10 Nm -2 b) 2.5x 10 11 Nm -2
c) 2.5x 10 12 Nm 2 d) 2.5x 107 Nm -2
12 If a mercury drop is divided into 8 equal parts, its total energy,
a) becomes 4 times b) becomes half
c) becomes twice )remains same
Page 2 of 8

Instruction for Assertion and Reason
correct explanation of A.
a) Both A and R are true andRis the
the correct explanation of A.
b) Both A and R are true but R is not
c) A istrue but R is false.
d)Ais false but Ris true.
angular speed, torque and angular
13 Assertion (A): If power of an engine depends on mass, dimensional method.
momentum, then the formula of power is
not derived with the help of the
depends on more than three quantities, then
Reason (R): In mechanics, if a particular quantity
quantity by the dimensional method
we cannot derive the formula of the
associated with a slowing down of a body.11
14 Assertion (A): Anegative acceleration of abody is
Reason (R): Acceleration is vector quantity.
moves in a circular path with uniform speed, an [1]
15 Assertion (A): Whenever a particle
acceleration exists which is directed towards the centre.
circular motion is always radially inward.
Reason (R): The net acceleration of a particle in
the exact relationship between|11
16 Assertion: The method of dimensions analysis cannot validate
physical quantities in any equation.
quantities having same dimensions.
Reason: It does not distinguish between the physical
SECTION-B

17 An electric bulb suspended from the roof ofarailway train
by a flexible wire shifts through an (2]
curved path of 200 m radius. Find the
angle of 19°48', when the train goes horizontally round a
speed of the train. (Tan 19°48' = 0.3600 )
respectively. 21
18 Three point masses of l kg, 2 kg and 3 kg lie at (1, 2), (0, - 1) and (2, - 3)
9)
Calculate the coordinates of the centre of mass of the system.
their circular orbits are in the [2]
19 Two satellites have their masses in the ratio of3:1, The radii of
ratio of 1:4. What is the ratio of total mechanical energy of Aand B?
exerted| 2
20 solid ball 300 cm in diameter is submerged in a lake at such a depth that the pressure
A
Kfor material
by water is 1.00 kgf cm-.Find the change in volume of the ball at this depth.
of the ball = 1,00 X 10 13 dyne cm -2
OR
surface to
Find the change in volume which 1 mof water will undergo when taken from the
the bottom of a lake 100 m deep. Given volume elasticity of water is 22,000 atmosphere.
have on reaching | 21
21| At what depth in an ocean willa bubble of air have one- fourth volume, it will
g/cc?
the surface? Given AtmosphericPressure= 76 cm of Hg and density of Hg = 13.6

Page 3 of 8

SECTION-C
22 The velocity of sound waves vthrough a medium may be assumed to depend on:
|31
the density of the medium dand the modulus of elasticity E. Deduce by the method of
dmensions the formula for the velocity of sound. Take dimensional constant K= 1.
23
The velocity of' atrain increascs at a constant ratea from 0 to v and then remains constant for
Sone time interval and then finally decreases to zero at aconstant rate ß. If the total distance
covered by the particle be x, then show that the total time taken will be t=+
24
Acyclhst starts from the centre Oof acircular park of radius Ikm, reaches the edge Pof the (3
park, then cycles along the circumference, and returns to the centre along Q0 as shown in
figure. If the round trip takes 10 min, what is the
i. net displacement, o
ii. average velocity, and o
iii. average speed of the cyclist? 22*5

P

25 A bullet weighing 10g is fired witha velocity of 800 ms,After passing through a mud wall
[3]
lm thick, its velocity decreases to 100 ms . Find the average resistance offered by the mud
wall. -3150

26 The force applied by aman in pushing ablock varies with displacement as shown in the (3|
figure. If the force is expressed in Newton and displacement in meters, find the work done by
him. 223

20|A
10
IM \20 25 30
5 10 15

|-10 Displacement
-20

Page 4 of 8

The stress - strain graphs for
materials Aand Bare shown in figure.

A

SIrain Stran
(a) (6)
The graphs are drawn to the same scale.
i. Which of the materials has greater Young's
modulus? b
ii. Which of the two is the stronger material?

OR
Derive relation of elastic potential energy of stretching wire
28 Asoap bubble of radius 4cm and surface tension 30 dyne cm- is blown at the end of a tube 3]
of length 10 cm and internal radius 0.20 cm. Iftheviscosity of air is 1.89 x 10- poise, find
the time taken by the bubble to be reduced to a radius of 2 cm.

Section D
29 Read the text carefully and answer the questions: Usingthe laws of physics, it is possible 14]
to make a successful jump shot in basketball every time. The trajectory of a basketball is
always aparabola. It is projectile when it is launched up into the air, and this is due to the
affects of gravity as well as the force put on the ball by the player that properly follows the
properties of a projectile.

Angle

hight of hoop
Beight of player

Horizontal distaDce
of hoop
The velocity of the ball changes as it moves through the air, but the
velocity of the first half of
the path matches with the last half of the path. It may deviate from its
path if the ball collides
with either the backboard or another player interfering with its
path.

Page 5 of 8

From the information of the height ofthe player, the horizontal distance and height of the hoop,
tne player can easily calculate the speed to be imparted to the ball and the angle for a sure
succeSS.
player sheight is 1.27 meters standing at adistance of 2meters from the hoop which is at a
height of 3.05 meters, he needs an angle of 55 and velocity of the ball 7 m/s to be imparted to
make his shot a success. (If he uses a smaller angle he has to shoot with a greater velocity.)
To improve chances of an accurate shot, often a player includes a backspin on the ball as he
launches it for a shot. The backspin ensures that the ball enters the hoop, especially if the shot
is a "soft shot." Soft shot is when the ball is shot at a low angle and
low velocity, the player adds
a backspin because if the ball winds up hitting the rim, the spin
will help it to enter the hoop.
The backspin changes the velocity direction (once it hits the rim) to the opposite
direction of
the rim rather than bouncing it out.
i The trajectory of a basketball is always a
a) May be a circle, may be a parabola b) Straight line
c) Parabola d) Circle
When the basketball deviates from its parabolic path?
a) If the ball collides with the backboard

b) If a backspin is applied to the ball
c) Both if the ball collides with the backboard and if the ball collide with another
player interfering with its path
d) If the ball collide with another player interfering with its path
iii. To calculate the speed to be imparted to the ball and the angle for an accurate shot the
required information are

a) Allof these b) Height of the hoop
c) Height of the player d) Horizontal distance of the hoop
iv. If the horizontal distance of the hoop from a player increases
a) Velocity should increase but angle should decrease b) Velocity and angle both
should decrease

c) Velocity and angle both should increase
d) Velocity should decrease but angle should increase

Page 6 of 8

Read the text carefully and answer the questions: Consider the flow at two regions 1 (i.e. 14]
30
BC) and 2(i.e. DE). Consider the fluid initially lying between B and D. In an infinitesimally
time intervald t, this fluid would have moved. Suppose v , is the speed at which fluid would
have moved. Suppose v is the speed at B and v , atD. then fluid initially at B has moved a
distance V1 0tto C(V14tis small enough to assume constant cross - section along BC).
In the same interval át, the fluid initially at Dmoves to E, a distance equal to v 20t. Pressues
p1 and P2 act as shown on the plane faces of areas A , and A , binding the two regions as
shown in figure
D E

h,

h,

i The work done on the fluid at BC is

a) p, A 4t b) A, 4 v

c) p, vË 4t d) p, 4 v
ii The work done on the fluid of DE is

a) p2 V2 At b) pz 4 V

c) p, A2 dt d) - pz 4 V

iii. Total work done on the fluid is

a) p, 4 V b) pz 4 V

d) (P,- p 2 )4 V

iv. The change in its kinetic energy is

b) paV(v;-vj)
d);pav(ui - )
Page 7 of 8

SECTION-E
31 Show that Newton's NCcond law of motion is the real law of motion.

OR
The driver of a sccs a child standingin the middle
three-wheeler moving at aspecd of 36 km/h to save thc child What is the
of the road and brings his vehicle to
rest in 4 scc just intime 400 kg and the mass
average retarding force on the vehicle ? The mass of the three wheeler is
of the driver is 65 kg
ofthe hole is 5]
32 From a
uniform disk of radius R. a circular hole of rradius is cut out. The centre
at from the centre of the original disc. Locate the centre of gravity of the resulting flat body.

OR
arms outstretched. The turntable
n enildStands at the centre of aturmtable with his two
i.
is the angular speed of
e Otaing with an angular speed of 60 rev/min. How much
inertia to 2/5
the child if he folds his hands back and thereby reduces his moment of
times the initial value? Assumethat the turntable rotates without friction.
kinetic
ii Show that the child's new kinetic energy of rotation is more than the initial
energy of rotation. How do you account for this increase in kinetic energy? 5 3

33 Define Gravitational potential energy. Hence, deducean expression for gravitational potential [5]
energy ofa body placed at a point near the surface of the earth?
OR

i. Derive an expression for the acceleration due to gravity gat a height hfrom the centre
of the earth.

ii. At what height above the earth's surface, the value of g became 25 %ofits surface
value

k***

Page 8 of 8