ST. XAVIER'S SCHOOL, SAHIBGANS
SECOND TERMINAL EXAMINATION (2022-2023)
.M.-80___ ‘Time — 211
Attempt all qu
Question 1. Choose the correct aption: (15)
. LA medium has a refractive index 1.4, Which
a) The speed of light in the medium is | «
b) The speed of light in air is $/7 times the sp
ey The speed of light in medium is. i
d) All the above are wrong.
2. An object ina denser medium when viewed from
for
a
\
wr +
aE i>
fer medium appears to be raised, The shift is minimum
wa) redlightb) blue light ©) orange fight df violet light.
3. The transformation of energy in a loudspeaker while in use is
Sound energy to Electrical energy ) Electrical energy to chemical energy
) Sound energy to heat energy al) Blectrical energy to sound energy
4. A force acts on a body pivoted at a point, such that line of action of force passes throuigh the pivoted poini
What will be the effet of this force on the body?
a) It will produce maximum turning effect sp)'There will be no turning effect on the body
¢) The body will tun slowly 4) The body will have both translational and rotational motion.
5. The point through which the light passes without any deviation in a thin lens is the
1) Centre of curvature bh) Fitst principal focus ¢) Optical centre d) Second focal point
6.1na single movable pulley, the load is raised by a vertical height of y then the distance moved by the 3 —@
effort i
way wy © 4) insufficient information 3
7.IFR.L. of two media bem, and ns respective then the eritical angle C for the given pair! ~
given by: :
asinC=ny/ny — bysin€
Choose the incorrect statement +
When a ray of light travels from optically rarer t 0
1
1
PATS
HN Uy
1
x
ep
a
p=
ry 1
ar
such that n> n
n/m e)sinC=nxm— d)sinC=n+m,
lly denser medium
a) Wavelength of light changes b) Intensity of light decreases
<6) Speed of light inereases 4) Frequency remains unchanged.
9, The transformation of energy during Photosynthesis is:-
Chemical energy to light energy b) Chemical energy to heat energy
©) Light energy to chemical energy 4) None of the above.
10. Identify the electromagnetic waves with wavelength range 0.1A° to 100 A°.
a) infrared radiations) radio w ©) microwaves. X-rays
11. What should be the angle between the force and the displacement so that the work done by the force is zero.
a) 0°
frome
Wil A body of mass 0.3 kg falls from a height of 10 m to a height of 7 m above the ground. Find the loss in
Potential and gain in kinetic energy of the body (g=10mvs") 03x10 (10-7) LO
8) A tay of light incident at an angle of incidence‘? passes through an equilateral glass prism such tha the
‘ean ay inside the prism is parallel tits base and emerges from the prism aan angle of emereenec
a) Howis ‘V related to ‘e'? | ~ @
) What is your opinion about the value of angle of deviation in such a situation? ba wn
®) Define the term couple, What kind of motion does it produce?
x) Ifthe power of motor be 200 kW, at what speed can it aise the load of 40000 N?YL~- oie Smfs!
xii) A prism of which material is required to obtain .
a) spectrum of ultraviolet rays.? Guorc»
) spectrum of infrared radiation? Qock Call (11x2=22)
SECTION -B
Attempt any 4 questions from this section,
Question. cleo Meow CR Wisble, UV natovay
i (Uy, 5
#) Arrange the electromagnatic wavek of the electromagnetic spectrum in the decreasing order of the
‘wavelength. Between ultraviolet rays and microwaves, which one has greater speed in vacuum and smaller
i Browne Stead un vactlin. Gr Bwallse fre Moc ee
i} A lens of foal length 30em forms an image on a sereen placed at a distance 90¢m ftom it Identify the lens.
Also find the position of the object and the magnification of the image,
4 J.
,
scanned with OKEN Scanner ) The diagram below shows a Pulley arrangement:
Bi)
4) Copy the diagram and mark the direction of tension in each strand of the string.
’b) What is the velocity ratio of the arrangement? 2 :
©) If the free end of the string moves through a distance d, find the distance by which the load is raised? />_
4) State the function of Pulley A and Pulley Buin the above arrangement. BH]
spl Foren > TC Laldoochmil ebbd
Question 4. ib malty Fer frowgh olin bt
3) Can a simple machine act asa force multiplier and a speed multiplier at the same time? State two differences
between ideal machine and practical machine.
ii) A coin is placed at the bottom of a beaker appear to be raised by 5 cm. If the refractive index of water is 4/3,
find the depth of the water in the beaker. 4 — Zi. 7 A%-20 73% A220 EX.
iii) A block and tackle system has five pulleys and effort is applied in the downward convenient direction.
a) Draw a labelled diagram of the system clearly indicating the points of application and directions of
the load and effort.
b) What is the velocity ratio of the system?
‘c) What is the maximum load that can be raised by applying an effort of 100 kef if the efficiency is 70%.
Hh Br L~ BOAO Kye > BV keal (344) °
Question 5.
{) A beam consisting of red, green and blue colours is incident normally on the face AB of an isosceles right
angled prism ABC as shown in the figure below. Complete the diagram to show the refracted and the emergent
rays, Given that the critical angle of glass- air interface for green colour is 45°.
) hk
Red + GFrren tbl:
P.O
scanned with OKEN Scanner ii) State three differences between single fixed pulley and single movable pulley.
iii) State the conditions required for total internal reflection. With the help of a suitable diagram show how a
right angled prism can deviate a beam of light by 90°. Show all the necessary angles. Give one application of E '
(3434 :
Question 6. =e
i) A ray of light PQ lent normally on the hypotenuse Ufa right angled isosceles prism ABC as shown in
the diagram.Copy the diagram and complete the path of ray PQ ill it emerges from the prism. What isthe value
of angle of deviation of the ray? ez
p |
fe daviahen 190"
ii) a) State the conditions for a body, acted upon by several forces to be in equilibrium. 24 foes vx eae!
b) Why does a spanner have a long handle? Ay all veo Foren Be
iii State the Principle of moment. A uniform mette rule is balanced at 60 cm mark, when weights of 5 gfand 40 gf are
suspended at 10.em mark and 80 cm mark respectively. Calculate the weight of the metre rule
pended k respectively. Caleulatg tye weight oft a
eS — hh Basa)
Question 7. a L “oq!
j) State the position of centre of gravity of the following objects" ypl0 PADK DO
a) Circular angular lami arallelogram Bxsortw 2S
) Circular dise by Triangular lamina ©) Parallelogra se a
ii) Derive an expression for gravitational potential energy of a body.
iiiy A boy weighing 50 kef climbs up a stair of 30 steps each 10 em high in 5 minutes and the girl weighing 40 kgf does
the same in 4 minutes. Compare : -
') the workdone by them _b) the power developed by them,
Wye SONY BEE 1500 Sw Ce
StF” gs
4
= 1S,
paar e pT Aes
wyewier SoA
Best of Luck
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