THESE QUESTION REPEATED SINCE 2005: 2020 SO THESE ARE WHERE HELP FULL.

1. .CLASS-X PHYSICS Page 1
SPECIMEN PAPER
ICSE BOARD EXAMINATION: 2019-20
CLASS-X
SUBJECT: PHYSICS
Time:1 Hrs. M.M.: 50
General instructions:
 All questionsare compulsory...
 The questionpaperis in24 questions.
 Question1-10 is contains1marks.
 Question11-24 is contains2, 3, 4 marks.
 Tick the correct option. 1-10question.
1. Moment of force is………………………. (scalar/vector) quantity. 1.
2. The moonrevolvingaroundthe earthisin…………….. (Static/dynamic) equilibrium.
1.
3. The centre of gravityof a hollowhisat distance x from itsvertex where the value of x is: 1.
(A) h/3 B) h/4 C) 2h/3 D) 3h/3
4. The centrifugal force is……………… (A real force / a fictitiousforce / centripetal force). 1.
5. A bodyat a heightpossesses……………………….(heat/kinetic/potential/solar) energy. 1.
6. The mechanical advantage of anideal single movepulleyis………….(1/ 2/ lessthan2). 1.
7. The heightrefractive index isof ……………………. (Diamond,Ruby,water). 1.
8. The critical angle forglass-airinterface is………………(240 /420 /450
). 1.
9. What isthe focal lengthof lensinpart?(15/10/20/5) cm. 1.
10. In a stepup transformer:a) Ns =Np b) Ns < Np c) nothingcan be said 1.
11. A vibratingturningforkisplaced overthe mouthof a burette filledwithwater.The tapisopenedandthe water
level graduallyfalls.It’sobservedthatthe soundbecomesthe loudestforaparticularslengthof air column.
4. (I) what isthe name of the phenomenontakingplace whenthishappens?
(ii) Whydoesthe soundbecome the loudest?
(iii) Whatisthe name of the phenomenontakingplace whensoundisproducedforanotherlengthof aircolumn
and isnot the loudest?
12. Whenacousticresonance takes place;a loudsoundisheard.Whydoesthishappen? Explain. 2.
13. Q1. How doesa stretchedstringonbeingsetintovibration,produce anaudible sound? 4.
Q2. Will this soundbe audible if the stringissetintovibrationonthe surface of the moon?Give reasons.
14. Mentiontwofactors onwhichthe internal resistance of acell depends. 4.
15. An electricbulbrated 220 V, 60 W is workingatfull efficiency. 6.
(I).State the resistance of the coil of the bulb.
(ii). anotheridentical bulbisconnectedinserieswiththe firstone andthe systemisconnectacrossthe mainsas
showbelow:
(1) State the rate of conversionof energyineachbulb.
(2) Calculate the total power. (Next part of this question in next page)

2. .CLASS-X PHYSICS Page 2
(3) What will be the total powerif the bulbsare connectinginparallel?
16. The dangersignal isred and the cloudsare seenwhite.Explainthe bothcase? 1.
17. State the conditionrequiredfortotal internal reflectionof lighttotake place. 1.
18. Give meaningof Refractionof lightanditscauses.Explainitbriefly? 2.
19. The ray diagram givenbelowillustratesthe experimentalset-upforthe detrimentalof the focal lengthof a
converginglensusingaplane mirror. 3.
I. state the magnificationof the imagesformed.
II.Write two characteristicsof images formed.
III. What isthe name giventothe distance betweenthe objectandthe optical centre of the lensinthe above diagram?
20. Draw the ray diagram to showhow a convex lenscanbe usedto produce a real,invertedand
magnifiedimage. 3.
21. Anobjectof mass ‘m’ isallowedtofall freelyfrompointA asshowninthe figure.Calculate the
total mechanical energyof the object at: 4.
I) pointA
II).pointB
III).pointC
IV).State the lawwhichisverifiedbyyourcalculationinparts (I),(II) and,(III).
22. If the powerof a motoris40 KW,at whatspeedcanit raise a loadof 20,000 N? 3.
23. A machine raisesaloadof800N through a heightof 20 m in8seconds.Calculate the poweratwhichthe machine
works. 2.
24. Where isthe centre of gravityof triangularLamina? 1.