Karnataka SSLC Question Paper 2022 Answer Key Science Physics

CCE RF
CCE RR A
O⁄´¤%lO⁄ ÆË√v⁄ ÃO⁄–y Æ⁄¬fiO¤– »⁄flMs⁄ÿ, »⁄fl≈Ê«fiÀ⁄ ¡⁄M, ∑ÊMV⁄◊⁄‡¡⁄fl — 560 003
KARNATAKA SECONDARY EDUCATION EXAMINATION BOARD, MALLESHWARAM,
BANGALORE – 560 003
G—È.G—È.G≈È.“. Æ⁄¬fiOÊ⁄–, »⁄·¤^È% / HØ√≈È — 2022
S. S. L. C. EXAMINATION, MARCH/APRIL, 2022

»⁄·¤•⁄¬ D}⁄ °¡⁄V⁄◊⁄fl
MODEL ANSWERS
¶´¤MO⁄ : 11. 04. 2022 ] —⁄MOÊfi}⁄ —⁄MSÊ¿ : 83-E (Phy)
Date : 11. 04. 2022 ] CODE NO. : 83-E (Phy)

…Œ⁄æ⁄fl : …e¤k´⁄
Subject : SCIENCE
(»èñÜ ËþÝ®Ü, ÃÜÓÝ¿á®Ü ËþÝ®Ü ÊÜáñÜᤠiàÊÜ ËþÝ®Ü / Physics, Chemistry & Biology )
( À¤≈¤ @∫⁄¥¿£% & Æ⁄‚¥´⁄¡¤»⁄~%}⁄ À¤≈¤ @∫⁄¥¿£% / Regular Fresh & Regular Repeater )
( ∫Ë}⁄À¤—⁄° / Physics )

( BMW«ŒÈ »⁄·¤®⁄¥¿»⁄fl / English Medium )
[ V⁄¬Œ⁄r @MO⁄V⁄◊⁄fl : 80
[ Max. Marks : 80

Qn.
Value Points Total

PART - A
( PHYSICS )

I. Multiple Choice : 4×1=4

1. The device used to produce electricity is

(A) Galvanometer (B) Electric generator

(C) Ammeter (D) Electric motor.

(B) Electric generator 1

RF/RR (A)-(200)-9046 (MA)-PHY [ Turn over

83-E (PHY) 2 CCE RF & RR
Qn.
Value Points Total

2. The correct formula that shows the relationship between potential
difference, electric current and resistance in an electric circuit is
R
(A) I = (B) I = VR
V
I V
(C) V = (D) R = .
R I

V
(D) R =
I 1

3. In Fleming’s right hand rule, the middle finger indicates the direction of

(A) induced electric current (B) magnetic field

(C) motion of the conductor (D) mechanical force.

(A) induced electric current 1

4. To get diminished and real image of an object from a convex lens, the object
should be placed
(A) at principal focus F 1

(B) between principal focus F 1 and 2 F 1

(C) beyond 2 F 1

(D) between principal focus F 1 and optical centre O.

(C) beyond 2 F 1
1

II. Answer the following questions : 2×1=2

5. Magnetic field lines do not intersect each other. Why ?

At the point of intersection the compass needle would point towards two
directions which is not possible. 1

CCE RF & RR 3 83-E (PHY)

Qn.
Value Points Total

6. Mention the SI unit of power of lens.

dioptre 1

III. Answer the following questions : 2×2=4

7. Draw the schematic diagram of an electric circuit comprising of electric cell,
electric bulb, ammeter and plug key.

Simple electric circduit

2

8. An object is placed at 25 cm in front of a concave mirror of focal length 15
cm. At what distance from the mirror should a screen be placed in order to
obtain a sharp image ?
OR
A concave lens has focal length of 15 cm. At what distance should the object
from the lens be placed so that it forms an image at 10 cm from the lens ?
1 1 1 1
+ =
v u f 2

1 1 1 1 1 1
= − = −
v f u − 15 − 25 2

1 −5+3 −2 1
= =
v 75 75 2

75 1
v = = – 37·5 cm
−2 2

RF/RR (A)-(200)-9046 (MA)-PHY [ Turn over

83-E (PHY) 4 CCE RF & RR
Qn.
Value Points Total

The screen should be placed at a distance of 37·5 cm, in front of the concave

mirror. 2

OR
1 1 1 1
− =
v u f 2

1 1 1 1 1 1
= − = −
u v f − 10 − 15 2

1 −3+2 −1 1
= =
u 30 30 2
1
u = – 30 cm
2

The object is placed at a distance of 30 cm from the concave lens. 2

IV. Answer the following questions : 3×3=9

9. Which is the major component of biogas ? Write four characteristics of a

good source of energy.

OR

Which element is used in making solar cell ? Write any four advantages of

solar cells.

Methane / CH 4 1

Characteristics of a good source of energy :
1
Which has do a large amount of work per unit volume or mass
2
1
Must be easily accessible / available
2
1
Must be easy to store and transport
2

Must be economical.
1
( Any other suitable answer )
2 3

OR

CCE RF & RR 5 83-E (PHY)

Qn.
Value Points Total

Silicon / Si 1

The advantages of solar cells :

They have no moving parts

Little maintenance

Work quite satisfactorily without the use of any focusing device

Can be set up in remote areas where people cannot reach easily

Can set up in those areas too, where laying of power transmission line
is not possible. ( Any four ) 4× 1
2 3

10. Draw the ray diagram to show the image formation by a convex lens, when
the object is kept at 2 F 1 of the lens. With the help of the ray diagram

mention the position and nature of the image formed.
[ F 1 : Principal focus of the lens ]

M

A

B Bl

Al

N
1
Position of the image — At 2 F2
2
1
Nature of the image — Real and inverted
2

( Figure ) 2 3

RF/RR (A)-(200)-9046 (MA)-PHY [ Turn over

83-E (PHY) 6 CCE RF & RR
Qn.
Value Points Total

11. What are the functions of an earth wire ? It is necessary to connect the
electric appliances having metallic body to earth wire in domestic electric
circuit. Why ? Explain.

OR

Explain Faraday’s experiment related to electromagnetic induction. Mention
the difference between direct and alternate current.

Functions of the earth wire :

This is used as a safety measure for appliances have metallic body in
domestic circuit

This provides a low resistance conducting path for the current

Any leakage of current in the appliances keeps its potential to that of
the earth and the user may not get a severe electric shock.

1+1+1 3

OR

Take a coil of copper wire having a large number of turns connect the
1
ends of the coil to a galvanometer
2
1
Take a strong magnet and move its one pole into the coil
2

There is a deflection in the needle of the galvanometer. This indicates
1
the presence of a current in the coil
2

Likewise, when the magnet is withdrawn back then also the needle of
galvanometer deflects and this indicates the presence of electric current.
1
2

Direct Current Alternating current

Direct current flows in one Periodically alternating current
1
direction reverse its direction 3

CCE RF & RR 7 83-E (PHY)

Qn.
Value Points Total

V. Answer the following question : 1×4=4

12. a) What are the advantages of connecting electrical devices in

parallel in an electric circuit instead of connecting them in

series ?

b) How are ammeter and voltmeter connected in an electric circuit ?

What are their function ?

a) Advantages of connecting electrical devices in parallel are :

The parallel circuit divides current through the electrical gadgets.

When one component fails, the circuit does not fail

The total resistance in parallel circuit decreases, so that

Electrical gadgets get current as per their resistance required.

( Any two ) 1+1
1
b) In an electrical circuit ammeter is connected in series
2
1
In an electrical circuit voltmeter is connected in parallel
2
1
Ammeter measures the rate of electric current in a circuit
2

Voltmeter measures the potential difference across the ends of a
1
conductor
2 4

VI. Answer the following question : 1×5=5

13. a) What is refraction of light ? State two laws of refraction of light.

b) What is refractive index of light ? “The refractive index of diamond is

2·42.” What is the meaning of this statement ?

RF/RR (A)-(200)-9046 (MA)-PHY [ Turn over

83-E (PHY) 8 CCE RF & RR
Qn.
Value Points Total

a) Light travelling obliquely from one medium to another, the direction

of propagation of light in the second medium changes

The incident ray, the refracted ray and the normal to the interface of

two transparent media at the point of incidence all lie in the same

plane

The ratio of sine of angle of incidence to the sine of angle of

refraction is constant, for the light of given colour and for the given
sin i
pair of media / = constant 1+1+1=3
sin r

b) The ratio of speed of light in air and the speed of light in medium.

The ratio of speed of light in air and the speed of light in diamond

is 2·42. 1+1=2 5