Kerala SSLC Physics Model Question Paper 2 English Medium

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Kerala SSLC Physics Model Question Paper 2 English Medium

General Instructions:

1. The first 15 minutes is the cool off time. You may – use the time to read and plan your answers.
2. Answer the questions only after reading the instructions and questions thoroughly.
3. Questions with marks series 1, 2, 3 and 4 are categorized as sections A, B, C and D respectively.
4. Five questions are given in each section. Answer any four from each section.
5. Answer each question by keeping the time.

Time: 1½ Hours
Total Score: 40 Marks

Section – A

Answer any four questions, Each question carries 1 score. [4 × 1 = 4]

Question 1.
Identify the first word pair relation and complete the second pair.
m : \(\frac{\mathbf{v}}{\mathbf{u}}\)
\(\frac{1}{f}\) : ______.
Answer:
\(\frac{1}{u}+\frac{1}{v}\)

Question 2.
Find the odd one

Answer:
I₂ > I_p

Question 3.
What is the unit of calorific value?
Answer:
Kilojoule/Kilogram.

Question 4.
What is meant by optic centre?
Answer:
The mid point of lens.

Question 5.
Which is the colour seen on the outer edge of the rainbow?
Answer:
Red.

Section – B

Answer any 4 questions. Each question carries 2 score. [4 × 2 = 8]

Question 6.
Whenever there is a change in the magnetic flux linked with a coil, an emf is induced in the coil.
a) What is the phenomenon called?
b) Name a device that works on this principle.
Answer:
a) Electromagnetic induction
b) Generator/Moving coil microphone

Question 7.
Which figures are correct, so that they can recombine the component colours of light.

Answer:
(b)

(d)

Question 8.
Choose the statements related with nuclear fusion.
1. Nuclei of greater mass splits into lighter nuclei
2. Lighter nuclei combine to form heavier ones
3. Process behind energy production in stars
4. Principle of atom bomb.
Answer:
2, 3

Question 9.
When a fuse wire is included in a household wiring, what are the precautions to be taken?
Answer:

• The ends-of the fuse wire must be connected firmly at appropriate points.
• The fuse wire should not project out of the carrier base.

Question 10.
a) What is the difference in structure of an AC generator and a DC generator?
b) How is AC generated in the armature of a DC generator is converted into DC in the outer circuit?
Answer:
a) Slip rings are used in AC generator and split ring commutator is used in DC generator
b) Split ring commutator converts AC into DC.

Section – C

Answer any 4 questions. Each question carries 3 score. [4 × 3 = 12]

Question 11.
Observe the figure.

a) If 6V AC is supplied instead of 6 VDC, the intensity of light decreases. Which .is the phenomenon behind this? Explain.
b) Suggest a method to decrease the intensity of light again.
Answer:
a) Self induction
The change in magnetic flux due to the flow of an AC in a solenoid will generate a back emf in the same solenoid in a direction opposite to that applied to it. This phenomenon is called self induction.
b) Insert a soft iron core into the solenoid in the AC circuit.

Question 12.
Match the following

A	B	C
Heater	Voice coil	Lighting effect
Bulb	Heating coil	Electromagnetic inductor
Microphone	Armature filament	Chemical effect Heating effect

Answer:
Heater → Heating coil → Heating effect
Bulb → filaments → lighting effect
Microphone → Voice coil → electro magnetic induction

Question 13.
a) What is the full form of LPG?
b) What is the main constituent of LPG?
c) What is the purpose of adding ethyl mercaptan to LPG?
Answer:
a) Liquified petroleum gas
b) Butane
c) As an indicator to detect gas leakage

Question 14.
A convex lens of focal length 15 cm, it is used to obtain an image on the screen the size of the images twice the size of the object.

a) Find out the distance between lens to object?
b) Find out the distance between lens to image?
c) Find out the focal length of the lens using ray diagram? Verity focal length of the lens using lens formula.
Answer:
f = +15 cm (check answer)
m = -2 (convex lens create real image so its magnification i negative)
m = \(\frac{u}{v}\)
-2 = \(\frac{v}{u}\)
v = – 2u

b) v = -2u
= -2 × – 22.5
= 45 cm

Question 15.
It is due to the power of accommodation of our eyes, we can see objects clearly.
a) What is meant by power of accommodation?
b) How is power of accommodation related to ciliary muscles?
Answer:
a) The ability of the eye to form an image on the retina by adjusting the focal length of the lens in the eye by varying the curvature of the lens.
b) When we look at nearer objects, the ciliary muscles are contracted and focal length decreases. While looking at far objects the ciliary muscles are released and the curvature of the lens decreases, The focal length of the lens increases.

Section – D

Answer any 4 questions. Each question carries 4 score. [4 × 4 =16]

Question 16.
A ray of light travels from air to glass slab is depicted below.
Observe the figure and answer the questions

a) Find out the incident ray?
b) Find out the refracted ray?
c) Which is the angle of incidence?
d) Which is the angle of refraction?
e) What happens when a ray of light obliquely travel from air to glass slab?
f) Name this phenomenon of light?
Answer:
a) PQ
b) QR
c) 30°
d) 19°
e) It bend towards the normal (refraction takes place)
f) Refraction

Question 17.
a) What is meant by energy crisis?
b) Write down two reasons for energy crisis
c) Give 4 methods to reduce energy crisis.
Answer:
a) Energy crisis is the consequence of increasing demand but decreasing availability
b) Increased population, Industrial revolution
c)

• Maximum utilisation of solar energy
• Judicious utilisation of energy
• Timely maintenance of machines
• Ensure maximum efficiency of machines.

Question 18.
An object ‘OB’ is placed in front of the lens is given below.

a) Name the lens?
b) Complete the figure, then find out the position of the image.
c) Identify the two nature of the image.
Answer:
(a) Convex lens
(b)

Images formed in between F and 2F
(c) Real and inverted images formed.

Question 19.
A person use a spectacle of power of lens -1.25 D
a) What type of lens is this?
b) What is mean by power of a lens?
c) Find the focal length of the lens?
Answer:
a) Power of the lens is negative. So it is a concave lens.
b) Power of a lens is the reciprocal of its focal length
c)

Question 20.

a) Which device is shown in the figure? What is the principle of this device?
b) When 100 V is applied in A, the current was 2A. Calculate the voltage and power received in B.
c) If 100 V is applied in B, find out the voltage and current in A.
Answer:
a) Transformer, mutual induction.

(b)

= 50 V
P = VI
= 100 x 2
= 200 W

c) V_s = 200 V
I = 1 A