TBSE Class 9 Model Question Paper for 2021 Science

Class - IX : Science (Biology) : 24 Marks : 2020-2021

!Ó˲yàÈüÈܲ ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ ÙylÈüÈ1 1x7=7

1ä àyˆÏSÈÓ˚ ˛õyï˛yÎ˚ §yˆÏ°yܲ§ÇˆÏŸ’ˆÏ£ÏÓ˚ çlƒ à%Ó˚%c˛õ)î≈ ˆÎ ôÓ˚ˆÏlÓ˚≤’y§!ê˛í˛ñ ï˛yÓ˚ lyÙ ˆ°ˆÏáy–
2ä !lˆÏ¡¨Ó˚ ˆÜ˛yl ˆÜ˛y¢ÈüÈxAàyl%!ê˛ ˆ≤Ãyܲƒy!Ó˚G!ê˛Ü˛ ˆÜ˛yˆÏ¢ ˆòáy ÎyÎ˚⁄
ܲä !lí˛z!Üœ˛Î˚y§ åáä !lí˛z!Üœ˛G°y§ åàä !lí˛z!Üœ˛Ü˛ xƒy!§í˛ åâä !lí˛z!Üœ˛Î˚ˆÏÎ˚í˛
3ä ATP- ~Ó˚ ˛õ%ˆÏÓ˚y lyÙ Ü˛#⁄
4ä xlyÜ˛Ùƒï˛y ܲ#⁄
5ä ˆÜ˛yl‰ ˆÓ˚yà!ê˛ Ù¢Ü˛# Óy!•ï˛ lÎ˚⁄
ܲä Ê˛y•zˆÏ°!Ó˚Î˚y åáä ÙƒyˆÏ°!Ó˚Î˚y åàä ˆí˛Aà% åâä ê˛y•zÊ˛ˆÏÎ˚í˛
6ä x!fiÌܲ°yÓ˚ 1!ê˛ Ü˛yçˆÏ°ˆÏáy–
7ä ˆÎ ôÓ˚ˆÏlÓ˚ ˛õƒyˆÏÓ˚lܲy•zÙy ܲ°y ç°ç í˛z!qòˆÏܲ çˆÏ° ˲y§ˆÏï˛ §y•y΃ ܲˆÏÓ˚ ï˛yˆÏòÓ˚ ܲ# ӈϰ⁄

áÈüÈ!Ó˲yà ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 3x4=12

8ä fl¨yÎ˚%ï˛ˆÏsfÓ˚ àë˛làï˛ G ܲyÎ≈àï˛ ~ܲˆÏܲÓ˚ lyÙ ˆ°ˆÏáy ~ÓÇ ~Ó˚ ~ܲ!ê˛ xÇ¢ !ã˛!•´ï˛ !ã˛e xÇܲl ܲÓ˚– 1+2
9ä çy•zˆÏ°Ù G ˆÊœ˛yˆÏÎ˚ÙÈüÈ~Ó˚ ò%!ê˛ ˛õyÌ≈ܲƒ ˆ°ˆÏáy– Ó˚=˛ ܲ#⁄ 2+1
xÌÓy
•,ÍˆÏ˛õ!¢Ó˚ !ï˛l!ê˛ ˜Ó!¢T˛ƒ ˆ°ˆÏáy–
10ä xƒy!rê˛ÓyˆÏÎ˚y!ê˛Ü˛ ˲y•zÓ˚y§ à!ë˛ï˛ ˆÓ˚yà !lÓ˚yÙˆÏÎ˚ ܲyÎ≈ܲÓ˚# lÎ˚ ˆÜ˛l⁄ !ê˛Ü˛yܲÓ˚î ܲ#⁄ 2+1
11ä !ã˛!ܲͧyÓ˚ ÙyôƒˆÏÙ ˆÓ˚yà !lÓ˚yÙˆÏÎ˚Ó˚ ˆã˛ˆÏÎ˚ ˆÓ˚yà ≤Ã!ï˛ˆÏÓ˚yô ÓƒÓfiÌy @˝Ã•î ܲÓ˚y x!ôܲï˛Ó˚ ˆ◊Î˚ÈüÈ Óƒyáƒy ܲÓ˚– AIDS
ˆÓ˚yˆÏàÓ˚ ç#Óyî%Ó˚ lyÙ Ü˛#⁄ 2+1

àÈüÈ!Ó˲yà ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 5 5x2=10

12ä ~ܲ!ê˛ í˛z!qò ˆÜ˛y¢ Óy ~ܲ!ê˛ ≤Ãyî# ˆÜ˛yˆÏ¢Ó˚ !ã˛e xAܲl ܲˆÏÓ˚y ~ÓÇ !l¡¨!°!áï˛ xÇ¢à%ˆÏ°y !ã˛!•´ï˛ ܲˆÏÓ˚y ÈüÈ
Ü˛ä ˆÏܲyˆÏ¢Ó˚ Ó!•Ó˚yÓÓ˚ܲ åáä ˆÜ˛yˆÏ¢Ó˚ Ù!hflÏ‹Ò åàä ˆÜ˛yˆÏ¢Ó˚ §!=˛âÓ˚ åâä ˆÜ˛yˆÏ¢Ó˚ xydâyï˛# Ì!°–
xÌÓy
ç#ÓˆÏòˆÏ• ˆÜ˛y¢ !Ó˲y!çï˛ •GÎ˚yÓ˚ ~ܲ!ê˛ Ü˛yÓ˚î ˆ°ˆÏáy– ~ܲ!ê˛ ≤Ãyî#ˆÏܲy¢ˆÏܲ °â%§yÓ˚ܲ G x!ï˛§yÓ˚ܲ oÓˆÏî Ó˚yáˆÏ°
ˆÜ˛yl‰ ˆ«˛ˆÏe ܲ# âê˛ˆÏÓ ˆ°ˆÏáy– ˆÜ˛y¢ï˛_¥ÈüÈ~Ó˚ ≤ÃÓ=˛y ܲyÓ˚y⁄ 2+2+1

Class - IX : Science (Biology) : 24 Marks : 2020-2021
Section-A: Each Questions Carries 1 Marks 1x7= 7

1. Name the king od plastid which is important for photosynthesis in leaves of the plants.
2. Which of the following cell-organelle is found in prokaryotic cell ?
i) Nucleus (ii) Nucleolus (iii) Nuclic Acid (iv) Nucleoid
3. Give the full form of ATP?
4. What is immunity ?
5. Which disease is not carried by mosquitoes ?
i) Filariasis (ii) Malaria (iii) Dengue (iv) Typhoid
6. State any one function of bone.
7. What are the names of the types of parenchyma tissues that help aquatic plants float in water ?
Section - B Each Questions of Marks-3 3x4=12
8. Name the structural and functional unit of nervous system and draw a labelled diagram of it.
1+2
9. Write two differences between xylem and phloem. What is blood ? 2+1
OR
Write three characteristics of the cardiac muscle.
10. Why are antibiotics not effective for viral disease ? What is vaccination? 2+1
11. ‘Prevention is better than cure”- justify. Which virus causes ‘AIDS’? 2+1
Section - C Each Questions Carries 5 Marks
12. Draw a plant or animal cell and label the following parts :
a) Outer covering of cell, (b) Brain of the cell
(c) Power house of cell (d) Suicidal bag of a cell, 3+2
OR
Write a reason why cells divide in an organism. What will happen if animal cells are placed in
hypotonic and hypertonic solution ? Who proposed cell theory ? 2+2+1

Class - IX : Science (Chemistry) : 29 Marks : 2020-2021
!Ó˲yàÈüÈܲ ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ ÙylÈüÈ1 1 x 7= 7

~ܲ!ê˛ ¢ˆÏ∑ Óy ~ܲ!ê˛ ÓyˆÏܲƒ !lˆÏ¡¨Ó˚ ≤ß¿à%!°Ó˚ í˛z_Ó˚ òyG /
1ä ≤Ãyã˛#l ˲yÓ˚ï˛#Î˚ òy¢≈!lܲˆÏòÓ˚ ÙˆÏï˛ ˛õòyˆÏÌ≈Ó˚ ˛õÑyã˛!ê˛ Ù)° í˛z˛õyòyl !ܲ !ܲ ⁄
2ä ˛õòyˆÏÌ≈Ó˚ !ï˛l!ê˛ xÓfiÌy !ܲ !ܲ ⁄
3ä â)î≈lΈÏsfÓ˚ §y•yˆÏ΃ !ܲ ˛õ,Ìܲ ܲÓ˚y •Î˚⁄
4ä ˆ§y!í˛Î˚yÙ ˆÙԈϰÓ˚ !ã˛•´ G ˲Ó˚ !°á–
5ä ˛ xƒyˆÏÙy!lÎ˚yÙ §y°ˆÏÊ˛ˆÏê˛Ó˚ §ÇˆÏÜ˛ï˛ !°á–
6ä Cl – xyÎ˚ˆÏlÓ˚ ˆÎyçܲ •zˆÏ°Ü˛ê˛∆l §Çáƒy •° û
ܲä 16 åáä 8 åàä 17 åâä 18
7ä ò%!ê˛ @˝Ã#l •yí˛zç àƒyˆÏ§Ó˚ lyÙ !°á–
áÈüÈ!Ó˲yà ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 3 3x4=12
!lˆÏ¡¨Ó˚ ≤ß¿à%!°Ó˚ §Ç!«˛Æ í˛z_Ó˚ !°á /
8ä åÜ˛ä ˆÎˆÏܲyl ˛õòyˆÏÌ≈Ó˚ xÓfiÌyÓ˚ ˛õ!Ó˚Óï≈˛ˆÏlÓ˚ §ÙÎ˚ í˛z£÷Ïï˛y !fiÌÓ˚ ÌyˆÏܲ ˆÜ˛l⁄ 2+1
åáä ~ܲ ÓyÎ˚%Ùu˛°#Î˚ ã˛y˛õ Ó°ˆÏï˛ !ܲ Ó%V˛⁄
9ä åܲä !Ù◊î G ˆÎÔˆÏàÓ˚ ÙˆÏôƒ ò%!ê˛ ˛õyÌ≈ܲƒ !°á–
åáä ôyï%˛Ü˛ˆÏ“Ó˚ ~ܲ!ê˛ í˛zòy•Ó˚î òyG– 2+1
10ä åܲä oÓˆÏîÓ˚ àyì˛¸c Ó°ˆÏï˛ !ܲ Ó%V˛⁄
åáä ≤ð¡∫ˆÏlÓ˚ ò%•z!ê˛ ôÙ≈ !°á– 1+2
11ä åܲä ÓyÎ˚% ò)£ÏˆÏîÓ˚ ܲyÓ˚î !°á–
åáä CFC ~Ó˚ ˛õ%ˆÏÓ˚y lyÙ !ܲ ⁄ 2+1
Óy
åàä í˛y°ê˛ˆÏlÓ˚ !fiÌÓ˚yl%˛õyï˛ §)e!ê˛ !ÓÓ,ï˛ Ü˛Ó˚–
åâä í˛y°ê˛ˆÏlÓ˚ ˛õÓ˚Ùyî%ÓyˆÏòÓ˚ ~ܲ!ê˛ fl∫#ܲyÎ≈ !°á– 2+1
àÈüÈ!Ó˲yà ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 5 5x2=10
12ä åܲä 0.9 @˝ÃyÙ çˆÏ° ˛õÓ˚Ùyî%Ó˚ §Çáƒy !lî≈Î˚ ܲÓ˚–
åáä x!:ˆÏçl G ˆÓyÓ˚l myÓ˚y à!ë˛ï˛ ~ܲ!ê˛ ˆÎÔˆÏàÓ˚ 0.24 @˝ÃyÙ lÙ%lyÎ˚ 0.96 @˝ÃyÙ ˆÓyÓ˚l G 0.144 @˝ÃyÙ x!:ˆÏçl ˛õyGÎ˚y ÎyÎ˚–
ˆÎÔà!ê˛ˆÏï˛ í˛z˛õ!fiÌï˛ í˛z˛õyòylà%ˆÏ°yÓ˚ ˲ˆÏÓ˚Ó˚ ¢ï˛Ü˛Ó˚y ˛õ!Ó˚Ùyî !lî≈Î˚ ܲÓ˚– 2+3
xÌÓy
Ü˛ä ˆÜ˛yl!ê˛ˆÏï˛ÈüÈ ˆÓ¢# §ÇáƒÜ˛ ˛õÓ˚Ùyî%Ó˚ Ó˚ˆÏÎ˚ˆÏSÈ 100 @˝ÃyÙ ˆ§y!í˛Î˚yÙ ly 100 @˝ÃyÙ ˆ°y•yÎ˚⁄
å≤Ãò_ ˛õyÓ˚Ùyî!Óܲ ˲Ó˚ Na=23U, Fe=56U).
åáä ˆ˛õyí˛¸yã%˛ˆÏl !ܲ !ܲ ˆÙÔ° xyˆÏSÈ⁄
åàä Ó•% ˛õÓ˚Ùyî%ܲ xyÎ˚l ܲ#⁄ ˆÙy°yÓ˚ ˲Ó˚ !ܲ ⁄ 2+1+2
13ä åÜ˛ä ˆÓyˆÏÓ˚Ó˚ ˛õÓ˚Ùyî% ÙˆÏí˛° xl%ÎyÎ˚# !ï˛lܲ«˛!Ó!¢T˛ ~ܲ!ê˛ ˛õÓ˚Ùyî%Ó˚ ˆÓ˚áy!ã˛e xÑyܲ–
åáä Ó˚yòyÓ˚ˆÏÊ˛yˆÏí≈˛Ó˚ ˛õÓ˚Ùyî% ÙˆÏí˛ˆÏ°Ó˚ ò%•z!ê˛ e%!ê˛ !°á–
åàä xƒyˆÏ˲yàƒyˆÏí»˛y §ÇáƒyÓ˚ Ùyl Ü˛ï˛ ⁄
åâä l#ˆÏã˛Ó˚ ˆÎÔˆÏà í˛z˛õ!fiÌï˛ ˆÙÔ°à%ˆÏ°yÓ˚ lyÙ !°á–
(i) §y°!Ê˛í˛z!Ó˚ܲ ~!§í˛–
(ii) ˛õê˛y!¢Î˚yÙ ly•zˆÏê˛∆ê˛– 1+2+1+1

Class - IX : Science (Chemistry) : 29 Marks : 2020-2021
Section-A: Each Questions Carries 1 Mark 1x7= 7
1. Name the five basic elements of matter accroding to early Indian Philosophers.
2. Give name of three states of matter.
3. What is seperated by using contrifuge machine ?
4. Write the symbol and mass of sodium element.
5. Write the formula of Ammonioum Sulphate.
6. Valence electron number in Cl– ion is –
(a) 16 (b) 8 (c) 17 (d) 18
7. Write name of two Green house gases.
Section - B Each Questions Carries 3 Marks 3x4=12
8. (i) For any substance, why does the temperature remain constant during the change of state ?
(ii) What do you mean by one atmoshperic pressure ? 2+1
9. (i) Write two difference between mixture and Compound ?
(ii) Name one of metalloid. 2+1
10. (i) What is Concentration of solution ?
(ii) Write two properties of suspension. 1+2
11. (i) Write two causes of air pollution.
(ii) Write the ful lform of CFC. 2+1
Section - C Each Questions Carries 5 Marks 5x2=10
12. (i) State the law of constant proportion.
(ii) State one postulate of Dalton’s atomic theory.
(iii) Calculate the number of atoms in 0.9 gm water.
(iv) 0.24g sample of a compound of oxygen and Boron was found by analysis to contain 0.096g
of Born and 0.144g of oxygen. Calculate the percentage of composition of the compound
by weight. 1+1+1+2
OR
a) Which has more number of atoms – 100 gm of Sodium or 100 gm if iron.
(Given atomic mass of Na=23U, Fe=56U)?
(b) Give the name of the elements present in quicklime.
c) What are polyatomic ions ?
d) What is molar mass ? 2+1+1+1

13)(a) Draw a sketch of Bohr’s atomic model of atom with three shells.
(b) Write down two drawbacks of Rutherford’s atomic model.
(c) What is the value of Avogadro Number?
(d) Give the name of the elements present in the following compounds.
(i) Sulphuric acid (ii) Potassium Nitrate. 1+2+1+1

Class - IX : Science (Physics) : 27 Marks : 2020-2021
!Ó˲yàÈüÈܲ / ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ ÙylÈüÈ1 / 1 x 6= 6

I) §!ë˛Ü˛ í˛z_Ó˚!ê˛ ÓySÈy•z ܲÓ˚ / 1x2
1ä ~ܲ!ê˛ Ó›Ü˛îy 5 !Ùê˛yÓ˚ Óƒy§yô≈ !Ó!¢T˛ ~ܲ!ê˛ Ó,_yܲyÓ˚ ˛õˆÏÌÓ˚ ˆÜ˛yl !Ó®% ˆÌˆÏܲ Îyey ¢%Ó˚% ܲˆÏÓ˚ ˛õ%lÓ˚yÎ˚ ˙ !Ó®%ˆÏï˛ !Ê˛ˆÏÓ˚
~°– ~ˆÏ«˛ˆÏe §Ó˚ˆÏîÓ˚ ˛õ!Ó˚Ùy˛õ •ˆÏÓ û
ܲä 10!Ùê˛yÓ˚ åáä ¢)lƒ åàä 5 !Ùê˛yÓ˚ åâä ~ˆÏòÓ˚ ˆÜ˛yl!ê˛•z lÎ˚–
2ä ˛â£Ï≈î Ó° §Ó≈òy Ó›Ó˚ §Ω˛yÓƒ à!ï˛Ó˚ û
ܲä x!˲Ù%ˆÏá !ܲÎ˚y ܲˆÏÓ˚– åáä !Ó˛õÓ˚#ï˛ !òˆÏܲ !ܲÎ˚y ܲˆÏÓ˚ åàä l#ˆÏã˛Ó˚ !òˆÏܲ !ܲÎ˚y ܲˆÏÓ˚ åâä §ÙˆÏܲyˆÏî í˛z˛õÓ˚ !òˆÏܲ !ܲÎ˚y
ܲˆÏÓ˚–
II) ~ܲ ¢ˆÏ∑‡ÓyˆÏܲƒ í˛z_Ó˚ òyG / 1x4
3ä o%!ï˛ÏÓ˚ SI ~ܲܲ ܲ#⁄
4ä ~ܲ!ê˛ !fiÌÓ˚ Ó›Ó˚ ˲Ó˚ 50 ˆÜ˛!ç – ~•z xÓfiÌyÎ˚ ï˛yÓ˚ ˲Ó˚ˆÏÓà Ü˛ï˛ •ˆÏÓ⁄
5ä ˛ ˛õ,!ÌÓ#˛õ,ˆÏ¤˛ ˆÎ Ó›Ó˚ Gçl 12 !lí˛zê˛lñ ã˛w˛õ,ˆÏ¤˛ ˙ Ó›Ó˚ Gçl Ü˛ï˛ ⁄
6ä ˆÜ˛yl Ó›Ó˚ í˛z˛õÓ˚ !ܲÎ˚y¢#° ӈϰÓ˚ Ùyl ¢)lƒ •ˆÏ° Ü,˛ï˛Ü˛yˆÏÎ≈Ó˚ Ùyl Ü˛ï˛ •ˆÏÓ⁄
!Ó˲yàÈüÈá
7ä ܲyÎ≈ G ¢!=˛Ó˚ ~ܲܲ ~ܲ•z •Î˚ ˆÏܲl⁄ 2
D xÌÓy
~ܲ!ê˛ à!ï˛¢#° Ó›Ó˚ à!ï˛¢!=˛ !ܲ˲yˆÏÓ •z•yÓ˚ à!ï˛ˆÏÓà ~ÓÇ Ë˛ˆÏÓ˚Ó˚ í˛z˛õÓ˚ !lË≈˛Ó˚ ܲˆÏÓ˚ ⁄
!Ó˲yàÈüÈà / ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 3 / 3x3=9
!lˆÏ¡¨Ó˚ ≤ß¿à%!°Ó˚ §Ç!«˛Æ í˛z_Ó˚ !°á /
8ä §yÓ≈çl#l Ù•yܲ£Ï≈ §)e!ê˛ !°á– SI ~ܲˆÏܲ §yÓ≈çl#l Ù•yܲ£Ï≈ ô%ÓˆÏܲÓ˚ Ùyl Ü˛ï˛ ⁄ 2+1
D xÌÓy
@˝ÃˆÏ•Ó˚ à!ï˛ §¡∫rô#Î˚ ˆÜ˛˛õ°yˆÏÓ˚Ó˚ §)eà%!° ˆ°á– 3
9ä xÓyˆÏô ˛õï˛l¢#° Ó›Ó˚ ˆ«˛ˆÏe ¢!=˛Ó˚ §ÇÓ˚«˛î §)e!ê˛ !ܲ˲yˆÏÓ ≤ÈÏÎyçƒ •Î˚ Óƒyáƒy ܲÓ˚–
D xÌÓy
≤Ã!ï˛!ê˛ 500 GÎ˚yˆÏê˛Ó˚ ã˛yÓ˚!ê˛ ï˛!í˛¸ÍÎsf 10 ârê˛yÎ˚ !ܲˆÏ°yGÎ˚yê˛ÈüÈârê˛y ~ܲˆÏܲ Ü˛ï˛ ï˛!í˛¸Í¢!=˛ ÓƒÎ˚ ܲÓ˚ˆÏÓ⁄
10ä Ú¢∑ !ÓhflÏyˆÏÓ˚Ó˚ çlƒ çí˛¸ ÙyôƒÙ ≤ÈÏÎ˚yçlÛû ~ܲ!ê˛ ˛õÓ˚#«˛yÓ˚ §y•yˆÏ΃ ≤ÃÙyî ܲÓ˚–
D xÌÓy
~ܲ!ê˛ ¢∑ÈüÈí˛z͈ϧÓ˚ !lÜ˛ê˛ ÓyÎ˚%ˆÏï˛ !ܲ˲yˆÏÓ Úâl#˲ÓlÛ G Úï˛l%˲ÓlÛ §,!T˛•Î˚⁄ âl#˲Ól G ï˛l%Ë˛ÓˆÏlÓ˚ ÙyôƒˆÏÙ í˛zͲõߨ
¢∑ï˛Ó˚ˆÏAàÓ˚ ≤ÃÜ,˛!ï˛ !ܲ ⁄
!Ó˲yàÈüÈâ / ≤Ã!ï˛!ê˛ ≤Èϟ¿Ó˚ Ùyl 5 / 5x2=10
11ä åÜ˛ä ˆÏÓà G o%!ï˛Ó˚ ÙˆÏôƒ ò%!ê˛ ˛õyÌ≈ܲƒ !°á–
åáä ~ܲ!ê˛ Ó›Ü˛îyÓ˚ ˆÓà 10m/s ˆÌˆÏܲ 1 !Ù!lˆÏê˛ ˆÓˆÏí˛¸ 40m/s •°– ӛܲîy!ê˛ §%£ÏÙ cÓ˚ˆÏî ã˛°ˆÏ° ˆ§•z cÓ˚ˆÏîÓ˚ Ùyl
Ü˛ï˛ !lî≈Î˚ ܲÓ˚– 2+3

xÌÓy
åܲä cÓ˚îˆÏܲ ܲál ôlydܲ ~ÓÇ Ü˛ál }îydܲ ôÓ˚y •Î˚⁄ 2+ (1.5+1.5)
åáä ~ܲ!ê˛ Óƒ!=˛ 90 !Ùê˛yÓ˚ ò#â≈ ç°y¢ˆÏÎ˚ §Ñyï˛yÓ˚ ܲyê˛ˆÏSÈ– ˆ§ 1 !Ù!lˆÏê˛ ~ܲ ≤Ãyhs˝ ˆÌˆÏܲ xlƒ ≤ÃyˆÏhs˝ §Ñyï˛yÓ˚ ˆÜ˛ˆÏê˛ ÎyÎ˚
~ÓÇ ~ܲ•z §Ó˚°˜ÏÓ˚!áܲ ˛õˆÏÌ !Ê˛ˆÏÓ˚ xyˆÏ§– ~ˆÏï˛ ˆ§ ˆÙyê˛ 180 !Ùê˛yÓ˚ ˛õÌ x!ï˛Ü˛Ù ܲˆÏÓ˚– ˙ Óƒ!=˛Ó˚ àí˛¸ˆÏÓà G àí˛¸o%!ï˛
!lî≈Î˚ ܲÓ˚–
12ä åܲä í˛zFã˛ °¡≥˛lܲyÓ˚# Óƒ!=˛ˆÏܲ Ü%˛¢l !ܲÇÓy Óy!°ˆÏï˛ ˛õí˛¸ˆÏï˛ ˆòGÎ˚y •Î˚ ˆÜ˛l⁄
åáä 25kg ˲ˆÏÓ˚Ó˚ ~ܲ!ê˛ Ó›Ó˚ í˛z˛õÓ˚ Ó° ≤ÈÏÎ˚yˆÏàÓ˚ Ê˛ˆÏ° Ó›!ê˛Ó˚ ˆÓà 10m/s ˆÌˆÏܲ ˆÓˆÏí˛¸ 20m/s •°– ˙ Ó° Î!ò 20
ˆ§ˆÏܲu˛ !ܲÎ˚y ܲˆÏÓ˚ñ ï˛ˆÏÓ ≤ÃÎ%=˛ ӈϰÓ˚ Ùyl Ü˛ï˛ ⁄ 2+3
xÌÓy
ܲä ày!í˛¸Ó˚ ã˛y°Ü˛ Óy xyˆÏÓ˚y•#ˆÏòÓ˚ !lÓ˚y˛õ_y ˆÓŒê˛ ˛õÓ˚y í˛z!ã˛ï˛ ˆÜ˛l⁄
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Class - IX : Science (Physics) : 27 Marks : 2020-2021

Section- A : Each Question Carries 1 Mark : 1x6=6
i) Choose the right answer : 1x2
1. A particle returns to its starting point after travelling a circular path of radius 5 metre. Its displace-
ment will be – a) 10 metre (b) zero (c) 5 metre (d) none of these.
2. Frictional force always acts – (i) in the direction of tentative motion (ii) in the opposite direction of
tentative motion (iii) downwards of the tentative motion (iv) perpendicularly upwards in respect of
tentative motion.
ii) Answer the following questions in one word/ sentence : 1x4
3. What is the SI unit of speed ?
4. The mass of a body at rest is 50 kg. What will be its momentum in this state ?
5. What will be the weight of an object on moon, the weight of that on earth being 12 newton ?
6. What will be the amount of work done when the force acting on a body is zero ?
Section - B
7. Why the units of work and energy are same ? 2
* OR
How does the kinetic energy of a moving body depend on its velocity and mass ? 1+1
Section - C : Each Question Carries 3 Marks : 3x3=9
8. Write the Universal law of Gravitation. What is the value of Universal Gravitational constant in
S.I.unit?
* OR
Write the Kepler’s laws of planetary motion.
9. Explain how the law of conservation of energy is applicable in case of free falling body.
* OR
Find the electric energy in kilowatt-hour consumed in 10 hours by four electrical devices of power
500 watt each.
10. ‘A material medium is essential for the propagation of sound’- prove it with an experiment.
* OR
How ‘compression’ and ‘rarefaction’ are found in air near a sound-source ? What is the nature of the
sound wave formed due to compression and rarefaction ? 2+1

Section- D : Each Question Carries 5 Marks : 5x2=10
11. (i) Write two differences between velocity and speed.
ii) The velocity of a particle increases from 10 m/s to 40 m/s in 1 minute. If the particle moves in
uniform acceleration, find the value of the acceleration. 2+3
OR
i) When acceleration is considered as positive and when it is negative ? 2+3
ii) A person swims in a lake of length 90 metre. He swims from one end to another in 1 minute and
returns along the same straight path. He covers a total path of 180 metre. Find the average velocity
and average speed of that person.
12. (i) Why high jumper is allowed to fall on a cushion or sand ?
(ii) The velocity of a body of mass 25kg increases from10m/s to 20m/s due to applied force on it. If
the force acts for 20 seconds, then find the amount of force applied. 2+3
OR
i) Why car driver or passengers should wear safety belt ?
ii) Every action has an equal and opposite reaction- explain the statement with an example. 2+3