MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY
(ENGLISH MEDIUM)
SSLC MODEL EXAMINATION 2017 FEBRUARY PHYSICS Max.score:40 Time: 1 ½ hr
1
Radio waves
Score: 1
2
(a) Nitrogen : Red
Score: ½
(b) Frequency: 50 Hz
Score: ½
Advantages 3
Hydrogen has more calorific value
It does not causes pollution
Score: 1
Disadvantages
Explosive in nature
It cannot be stored easily, and difficult to transport.
Score: 1
(a) 4
Bandages that heals wound easily
Manufacturing of batteries of increased efficiency
Producing paints, varnish
Creating display screen of low weights
Long lasting tennis ball
Score: 2
(any four usage) (b)
When particles are converted to nano size the ratio between their surface area and volume increases comparatively,
thereby
improving
their
Score: 1
physical
properties.
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SSLC
MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY
5
(a) Voltage , V= 240 V Power P= 40 W Resistance , R =
Score: 2
𝐕𝟐 𝑷
=
𝟐𝟒𝟎 ×𝟐𝟒𝟎 𝟒𝟎
= 1440 Ω Score: 2
(b)
6
(ENGLISH MEDIUM)
High melting point
High ductility
High resistivity
Ability to emit white light in the white hot condition
(A) (a) Different colors have different wavelength and different
Score: 1
rate of scattering (b) Experiment with sodium thiosulphate and HCl
(c) When the size of particle is greater than the wave length
Score: 2
Score: 1
of light , all the colors will scatter equally (B) (a) Scattering : It is the phenomenon of irregular or partial reflection of
Score: 1
light is called scattering. (b) Tyndal effect: the scattering of light beam on colloidal
Score: 1
solution(particle size less than 1 nm) (c)
High wavelength so they can travel more distance
Scattering loss is minimum and can visible in
Score: 1
night 2 www.mathsblog.in
SSLC
MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY (d) Dark , because in moon there is no atmosphere so there is
(ENGLISH MEDIUM) Score: 1
no scattering of light occurs
7
(a) If the natural frequency of the body undergoing vibration is the same as that of the influencing body, the vibration is
Score: 1
maximum and is called resonance (b) Resonance column
Score: 1
(c) High pressures are experienced in places where the air particles are close. Such regions are called compression (C). Region of low pressure are rarefaction (R) , here air particle are not close.
Score: 2
Particles vibrate in a direction parallel to direction of propagation of wave.
(a) Sound coming out from the source gets reflected 8
repeatedly from many parts of the building and reaches
Score: 1
us. so many sound waves reaching our ears at the same time causes a boom sound called reverberation (b)
Make the floor rough
Used folded curtains
Use carpet on floor
Construction of more windows and doors
Cushioning the seats
Avoid curved walls
Score: 1
(any two methods )
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SSLC
MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY
(a) 0.6 A because in fig A bulbs are connected in 9
(ENGLISH MEDIUM)
Score: 1
series so current is same (b) Fig. B
Score: 1
(c)
10
Same voltage can obtain for each device
Can control each device individually
A
B
Green color
Complementary
Score: 2
C Magenta
color Inductor
Henry Score: 3
Nuclear
Non
Brown energy
energy
conventional
Evaporation 11
It is the process by which a liquid changes into vapour by absorbing heat from surroundings. This is a normal process that takes place in the surface of liquid at all temperature. it is a slow process
Score: 2
Vapourisation Vapourisation is the process by which a liquid changes into its gaseous state at its boiling point.
The temperature dependence of both are different
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SSLC
MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY
(ENGLISH MEDIUM)
(a) No: of Primary turns, NP =20,000 12
No: of secondary turns, NS = 30,000 Voltage in the primary ,Vp= 160 V Voltage in the secondary, VS = ?
𝑽𝑺 𝑽𝑷
=
𝑵𝑺 𝑵𝑷
∴ 𝑽𝑺 =
𝑽𝑷 ×𝑵𝑺 𝑵𝑷
𝟏𝟔𝟎×𝟑𝟎𝟎𝟎𝟎
=
𝟐𝟎𝟎𝟎𝟎
= 240 V
Score: 2
(b) As no.of turn’s increases in the secondary the flux linked with secondary increases thereby increases the induced
Score: 1
emf in the secondary. (c) 500 W. Because power in the primary and secondary are
Score: 1
equal.
(A) (a) Mass , m = 5 Kg
13
Change in temperature , 𝜽 = 313K -303K = 10 K Quantity of heat , Q = 209300 J Q = mc𝜽 C=
𝑸 𝒎𝜽
=
𝟐𝟎𝟗𝟑𝟎𝟎 𝟓×𝟏𝟎
= 4186
J/Kg K
Score: 2
(b)
The change in atmospheric temperature do not affect our
Score: 2
body temperature quickly
Water is used as a coolant in radiators of engines
Land breeze and sea breeze
(B) (a) J / Kg
Score: 1
(b) It is the quantity of heat absorbed by 1 Kg of solid
Score: 1
to change into liquid state at its melting point without change in temperature
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SSLC
MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY
sslc model examination february 2017 physics answer key (english ...
High melting point. ⢠High ductility. ⢠High resistivity. ⢠Ability to emit white light in the white hot condition. Score: 2. Score: 2. 6. (A). (a) Different colors have ...
SSLC MODEL EXAMINATION FEBRUARY 2017 PHYSICS ANSWER KEY (ENGLISH MEDIUM). 3. (d) Dark , because in moon there is no atmosphere so there is no scattering of light occurs. Score: 1. 7. (a) If the natural frequency of the body undergoing vibration is th
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Page 1 of 7. SSLC MODEL EXAMINATION, FEBRUARY 2018. ENGLISH. Answer Keys. 1. Martha heard voices raised in anger as if in some sort of argument. 2. She came back to her class to take her PE shorts. 3. There were in the class Mr. Schmidt, Martha's his
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