SRI VISHWESHWARAIAH SCHOOL-ICSE

(Affiliated to CISCE Board, New Delhi, No: KA-129/2007)

Class: X STD SUBJECT – PHYSICS Time : 2h 15m
Date : 30.09.24 HALF YEARLY EXAMINATION 2024-25 Marks: 80

PHYSICS
(SCIENCE PAPER 1)
Maximum Marks: 80
Time allowed: Two hours
Answers to this Paper must be written on the paper provided separately
You will not be allowed to write during the first 10 minutes.
This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.

Section A is compulsory. Attempt any four questions from Section B.

The intended marks for questions or parts of questions are given in brackets [ ].

SECTION A (40 Marks)

(Attempt all questions from this section)

Question 1
Choose the correct option. 15M
i) The direction below show a force F=40N acting on a rod AB pivoted at A in different directions.
Identify the correct statement.

a) P and S have opposite moments

b) the magnitude of the moment of force is maximum in R
c) the magnitude of the moment of force is maximum in P and Q
d) the moment of force in R is negative

ii) The adjoining fig shows that planets are revolving around the sun.
Identify the correct statement.

a) the work done is zero as the distance is zero

b) the work done is zero as the displacement is zero
c) the work done is zero as both force and displacement is zero
d) none of these

iii) a) what is work done when a basketball player dribbles the ball, he applies a force towards gravity
b) what is the work done by a fielder when he takes a catch in a cricket match.

a) b)

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 a) work done by both of them is positive
b) work done by A is positive where as work done by B is negative
c) work done by both of them is negative d) none of the above

iv) Observe the adjoinig fig and identify the correct statement.

a) as the loadarm is longer than effort arm it belongs class III lever
b) as the effortarm is longer than the load arm it belongs to class II lever
c) as the fulcrum is in between load and effort it belongs to class I lever
d) none of these

v) A ray of light travels undeviated on passing through the optical boundary.

a) if both the media is same
b) if both mediums have the same refractive index
c) the ray makes an angle of 00 with the normal
d) all the above

vi) If a part of the lens is covered its focal length ____________

a) increases b) decreases c) remains uncharged d) none of these

vii) The unit used to measure wavelength of electromagnetic spectrum called.

a) hertz b) meter c) angstrom unit d) ms-1

viii) A bond of colour obtained on the screen when polychromatic light splits into colour is called _____
a) bright band b) diffraction c) interference d) spectrum

ix) The minimum time for reflected sound to reach after the original sound is heard to hear an echo is
a) 0.2s b) 0.1s c) 0.4s d) 0.3s

x) The waves used in RADAR is

a) infrasonic waves b) ultrasonic waves c) electromagnetic waves d) visible waves

xi) Heat capacity is

a) mass X specific heat capacity b) Mass x temperature
c) mass ÷ specific heat d) Mass + specific heat

xii) Boiling point of a liquid ___________ with addition of impurities.

a) increases b) remains constant c) changes d) decreases

xiii) Specific latent heat of fusion of ice is _____________

a) 2260 Jg-1 b) 80 Jg-1 c) 336 Jg-1 d) 4200 Jg-1

xiv) A person handling radioactive substances protects his hands by _____________

a) platinum gloves b) golden gloves c) iron gloves d) lead gloves

xv) Which of the following can undergo nucleus fission reaction?

a) uranium b) deuterium c) barium d) krypton

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Question 2
i) A body falls freely under gravity from rest. Name the kind of energy it will possess.
a) At the point from where it falls.
b) While falling.
c) On reaching the ground. 3M

ii) a) An electric heater of power 3kw is used for 10h. How much energy does it consume? 2M
b) State one difference between light waves & sound waves. 1M

iii) With reference to SONAR answer the following questions.

a) Name the type of waves that are used.
b) Give one reason for their use. 2M

iv) Derive the relationship between mechanical advantages, velocity ratio and efficiency of a machine. 2M

Question 3
i) The given diagram shows the refraction of light from air to a
medium water from the fig 2M

a) Write the value of angle of incidence.

b) What is the refractive index of water with respect to air.

ii) An object AB is placed at 2F1 on the principal axis of a convex lens as

shown in the diagram given below. 2M

Copy the diagram and using two rays starting from a point. A
obtain the image of the object formed by the lens.

iii) Observe the given diagram and answer the following questions. 3M

Why the bottom of cooking utensils is made of thick layer?

a) What is the numerical value of specific heat capacity of copper?
b) If you prefer copper based utensils, how will you benefited?

iv) a) 1300J of heat energy is supplied to raise the temperature of 0.5kg of lead from 200C to 400C.
Calculate the specific heat capacity of lead. 2M
b) What do you mean by the statement. The heat capacity of a body is 50 Jk-1 1M
c) What is meant by Radioactivity? Name two radioactive substances. 3M
d) State two safety measures to be taken white establishing a nuclear power plant. 2M

SECTION B (40 Marks)

(Answer any four questions from this Section)

Question 4
i) A ray of light X Y passes through a right angled isosceles prism as shown a
longside in Fig. 3M

a) What is the angle through which the incident ray

deviates and emerges out of the prism?

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b) Name the instrument where this action of prism is put into use.
c) Which prism surface will behave as a mirror?

ii) Study the diagram Fig. given below 4M

a) Name the lens LL’.

b) What are the points O and O’ called?
c) Complete the diagram to form the image of the object AB.
d) State the one characteristics of the image.

iii) Name the material of prism required for obtaining the spectrum of a
a) Ultraviolet light
b) Infrared radiations 2M
iv) What is meant by scattering of light. 1M

Questions 5
i) a) Define the term dispersion of light. 2M
b) Explain the cause of dispersion of white light through a prism. 1M

ii) The diagram alongside shows a lens as a combination of a glass slab and two prism. 3M
a) Name the lens formed by the combination.
b) What is the line XX’ called?
c) Complete the path of the incident ray AB after passing through the lens.
d) The final emergent ray either meets XX’ at a point or appears to
come from a point on XX’.
Label it as F. What is this point called?

c) With reference to the adjoining fig answer the following questions. 4M

A ray PQ is normally incident on one face of an equilateral glass prism.
a) What is the angle of incidence on the first face of the prism?
b) What is the angle of refraction from the first face of the prism?
c) What will be the angle of incidence at the second face of the prism.
d) Will the light ray suffer minimum deviation by the preism?

Question 6
i) a) A uniform metre rule balances horizontally on a knife edge placed at the 58cm mark when a weight of
20gf is suspended from one end. 3M

a) Draw a diagram of the arrangement

b) What is the weight of the rule?

ii) A boy of mass 40kg climbs up the stairs and reaches the roof at a height 8m in 5s. Calculate: 3M
a) The force of gravity acting on the boy.
b) The work done by him against the force of gravity.
c) The power spent by the boy. (Take g=10ms-2)

iii) a) State the work-energy theorm. 2M

b) State whether work is done or not by writing yes or no in the following cases. 2M
1. A man pushes a wall
2. A coolie stands with a box on his head for 15 min

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Question 7
i) Classify the following into levers as class I, Class II or Class III.
a) Nodding action of head. 3M
b) Rowing the boat by short handle.
c) Raising weight of the body on toes.

a) B) c)

ii) A man is standing infront of the cliff. He fires a given. 3M

a) Name the term that he hears distinctly after the original sound is ceased.
b) What is the approximate distance in air required to happen the above
phenomenon!
c) State one application of the above phenomenon.

iii) a) State two differences between RADAR & SONAR 2M

b) What are mechanical waves? 1M
c) An echo is heard in 3s after the emission of sound. If the speed of sound in air is 340 ms-1.
What is the distance of the reflecting surface from the source? 1M

Question 8
i) In fig draw a tackle to lift the load by applying the force in downward direction. 3M
a) Mark in the diagram the direction of load L and effort E.
b) If the load is raised by 1 m, through what distance will the effort move?
c) State the number of stands of tackle supporting the load.

b) Calculate the MA of this pulley system it its efficiency is 80%

c) Change in design of the machine would change the VR of the machine (True/false) 1M

ii) When a person whirls a stone tied with a thread in a circular

path, the thread needs to be pulled inwards. 3M

a) Name the force developed in the thread held by the hand?

b) What is the path of the stone if the thread breaks.

c) Does the velocity in the above case remains constant or variable?

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iii) Three rays, A, B and C start from a point source O inside a glass block. The critical angle for 3M
glass-air interface is 480 as shown by angle OBN’.
a) Show the path of the three rays after these strikes the boundary XY of glass-air interface.
b) Name the phenomenon exhibited by each ray.

Question 9
i) In the fig given below there are three bodies of different shapes. Copy each diagram, draw lines to
indicate the position of centre of gravity. 3M

a) b) c)

ii) A slab if ice at 00C is constantly heated till the steam is formed at 1000C. Draw a graph showing the
change in temperature with time. Label the various parts of the graph property. 3M

iii) Fig shows a radioactive source S in a thick lead walled container having
a narrow opening. The radiations pass through an electric field between
the plates A and B.
a) Complete the diagram so show the paths of 𝛼𝛽 and 𝛾 radiations. 2M

b) What is nuclear fission? Write its nuclear reaction. 2M

PHYSICS TEACHES PEOPLE TO ACCEPT REALITY WITH AWE AND ADMIRATION NOT TO MENTION THE
AMAZEMENT AND JOY THAT COME WITH IT.

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