10th Physical Sciences Model Questions – Page 11

Paper -I Part – A 4 Marks Questions
The Process of Cooling glass slowly is called annealing
I. 1. Give a comparison between Newton’s
Corpuscular theory and Wave theory of light.

Newton’s Corpuscular Theory
1. It assumes that light consists of a stream of extremely small particles called Corpuscles.
2. The rectilinear propogation of light is explained by the straight line motion of Corpuscles.
3. The colours of light are due to difference in the sizes of Corpuscles.
4. The reflection and refraction of light are explained by the repulsion and attraction of the Corpuscles by the medium.
5. It cannot explain the Phenomena of interference, diffraction
and Polarization of light.
6. It Predicts that the velocity of light in a denser medium is greater than that in a rarer medium.

Huygen’s Wave Theory
1. It assumes that light travels in the form of a wave.
2. The rectilinear propogation of light is explained by the advancement of wave front along the direction of normals
drawn to it.
3. The colours of light are due to differences in the Wave lengths.
4. The reflection and refraction are explained by the construction of secondary wave fronts applying Huygen’s Principle.
5 . It can explain the Phenomena of interference, diffraction
and Polarization of light.
6 . It correctly proves that the velocity of light in a denser
medium is less than that in a rarer medium.

2. Explain the formation of Co-ordinate Covalent bond.
A.1. The bond in which one of the two combining atoms contribute the electrons and those are shared by the both atoms is called co-ordinate covalent bond.
e.g.: NH3 → BF3, NH4 +, H3O+…..
2. Formation of Ammonia-Boron trifluoride molecule: Ammonia (NH3) molecule has a pyramidal shape and has a lone pair of electrons on
nitrogen. On the other hand boron trifluoride (BF3) has planar triangular shape and has one empty P orbital.
NH3 molecule donate the pair of electrons to BF3 and forms a Co-ordinate covalent bond.
Nitrogen donates its lone pair of electrons and boron accepts. Ammonia Boron trifluoride is formed.
F3B+:NH3 → F3B:NH3 (or) F3B ← NH3.

2 Marks Questions

3. What are the factors that influence the value of ‘g’.
A. ‘g’ decreases with attitude (height) and depth.
‘g’ is maximum at the poles and minimum at the equator.
‘g’ is slightly affected by geological deposits, massive concrete buildings and topography.

1 Mark Questions

5. What is a damped Vibration.
A. Periodic Vibrations of decreasing amplitude are called damped vibrations.
6. What is Annealing.
A. The process of cooling glass slowly is called annealing.

Part B

II. A. Multiple Choice questions: (12 ) mark each)
Pickup the correct answer.
7. The example of Para magnetic Substance is-
A) Aluminium B) Mercury
C) Cobalt D) Gold
8. Units of ‘G’ in S.I. system.
A) Nm2 Kg-2 B) N/ Kg
C) Kg/Nm2 D) Nm2/kg
9. The radiations used in RADAR are-
A) Radio Waves B) Micro Waves
C) X-rays D) γ – rays
10. The instrument used to measure Potential difference between two points is called-
A) Galvano meter B) Volt meter
C) Ammeter D) Sphero meter

11. Neptunium Series is a-
A) (4n + 1) Series B) (4n + 2) Series
C) (4n + 3) Series D) 4n Series

12. Molecules having double bond.
A) N2 B) C2H4 C) HCl D) Cl2

13. Defecation is addition of.
A) Ca(OH)2 B) CO2 C) SO2 D) P2O3

14. ______ COOR is called.
A) Acid group B) Anine group
C) Ester group D) Ketone group

15. Shaving soap contains excess of-
A) Builders B) Perfume
C) Glycerol D) Stearic acid

16. The catalyst used in hydrogenation of oils is.
A) Al B) Zn C) Ni D) Mg

B. Fill in the blanks with suitable word or words 1/2 mark each)

17. The unit for solid angle (Ω) is …………
18. ………… rays are emitted in radio activity.
19. Distance between a node and the next antinode is …………
20. The conductors which do not obey Ohms law are called as …………
21. 238 234 92
U → 90
Th + ……….
22. The valence electronic configuration of Cr
(Z = 24) is …………
23. The body fluid, whose pH > 7, is …………
24. Electro negativity is measured in ….. Scale.
25. The formula for Stearic acid is …………
26. The …………period is incomplete.
27. The general formula of Alkynes is …………

Part: B: Answers:

A – 7) A 8) A 9) B 10) B 11) A 12) B 13) A
14) C 15) D 16) C.
B – 17) Steradian 18) α β and γ 19) λ/4
20) Non-ohmic conductors 21) 4
2He
22) 4S’. 3d5 23) Blood which is alkaline in
nature 24) Linous Pauling 25) C17H35 COOH
26) VII 27) CnH2n-2

I. Multiple Choice Questions. (1/2 mark each)
Write the letter of the correct answer in the brackets provided against each question.
1) The wave theory of light was proposed by [ ]
A) Newton B) Maxwell C) Huygens D) Faraday.
2) Shallow water region behaves as… [ ]
A) Boundary of the media B) Denser medium C) Rarer medium D) None of the above
3) Bending of light waves around an obstacle is known as [ ]
A) Refraction B) Diffraction C) Polarisation C) Reflection
4) Newton proposed this theory of light [ ]
A) Corpuscular theory B) Wave theory C) Electromagnetic theory D) All the above
5) When a crest of one wave falls on the trough of another wave then the interference is [ ]
A) Normal B) Abnormal C) Constructive D) Destructive
6) Lasers are used in the treatment of diseases of [ ]
A) Brain B) Bone fracture C) Heart D) Lung
7) Solid angle is measured in [ ]
A) Lumen B) Candela C) Phot D) Steradian
8) Speed of light in vacuum is [ ]
A) 5x108m/s B) 3x105m/s C) 3x108m/s D) 3×10-8m/s
9) Lumen is the unit of [ ]
A) Luminous flux B) Solid Angle C) Luminous intensity D) Diffraction
10) The process of achieving population inversion is called [ ]
A) Projecting B) Stimulated emission C) Processing D) Pumping

II. Fill in the blanks with suitable answers. (1/2 mark each)
11) Wave theory was proposed by —–
12) For constructive super position of waves, phase difference between the waves should be equal to —–
13) A wave under goes a phase change of — on reflection
14) Newton proposed — theory of light
15) Corpuscles are —– by the reflecting surface
16) Corpuscles are —– by the refracting surface
17) The size of corpuscles are —– for different colours
18) According to corpuscular theory, the velocity of light in —– medium is greater than that in —– medium
19) Corpuscular theory could not explain the phenomenon of —– , —– and —–
20) Huygens originally thought that for the propagation of light waves —– is required.
21) Candela is the unit of —–
22) The process of achieving ‘Population inversion’ is called —–
23) The wave length of ruby laser is —–
24) Expanded form of LASER is —–
25) The unit of solid angle is —–
26) —– is an example for gaseous laser
27) —– makes a laser light optical music
28) A —– light source gives coloured fringes
29) in computers, lasers are used to retrieve stored information from a —–
30) —– are used for bloodless surgery

III. Match the following (1/2 mark each) Group A Group B
31) Corpuscular theory [ ] A) Bending of a wave
32) Wave theory [ ] B) Maxwell
33) Electromagnetic theory [ ] C) Demonstration of waves
34) Diffraction [ ] D) Huygens
35) Ripple tank [ ] E) Newton

Group A Group B
36) Solid laser [ ] A) Rate of rotation of earth
37) He- Ne laser [ ] B) Pumping
38) Astronomy [ ] C) Three dimensional photography
39) Holography [ ] D) Stellar objects
40) Population inversion [ ] E) Ruby laser
ANSWERS
I. 1) C 2) C 3) B 4) A 5) D 6) A 7) D 8) C 9) A 10) D
II. 11) Christian Huygens 12) Zero (or) an integral multiple of 2Π 13) Π or 180o 14) corpuscular 15) repelled 16) attracted 17) different 18) Denser, rarer 19) interference, diffraction, polarisation 20) a medium 21) Luminous intensity 22) Pumping 23) 6943 Ao 24) Light Amplification by stimulated Emission of Radiation 25) steradians 26) He-Ne 27) coherence 28) White 29) compact Disc (CD) 30) Lasers
III. 31) E 32) D 33) B 34) A 35) C 36) E 37) A 38) D 39) C 40) B

10th Class Physical Sciences Imp Questions – English Medium

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