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UNSOLVED
| Physics | Tenth, 2025 Lahore Board | Group – II |
| Time: 1.45 hrs. | Subjective | Marks : 48 |
PART – I
Q.2
Write short answers to any FIVE (5) questions: 10
i Find the time period of simple pendulum of 1.0 m long where g=10ms⁻².
ii Define transverse wave with example.
iii What are damped oscillations?
iv Define volt.
v What is capacitor? Write the unit of capacitance.
vi If V = 50 V and C = 100μF then Q = ?
vii Draw symbol diagram of AND gate. Write down its truth table.
viii Write the names of logic operations.
Q.3
Write short answers to any FIVE (5) questions: 10
i What is meant by reverberation?
ii Define pitch, on what factors it depend.
iii Why sound of women is shrill as compared to men?
iv What is unit of electric current, define it.
v Define e.m.f., also write its formula.
vi Write down the limitations of Ohm's law.
vii Define transmitter and transmission channel.
viii What do you know about flash drive?
Q.4
Write short answers to any FIVE (5) questions: 10
i Define Snell's law. Write down its formula.
ii Differentiate between convex mirror and concave mirror.
iii Find the value of critical angle for water (refracted angle = 90°), refractive index of water is 1.33 and refractive index of air is 1.
iv Who observed induced current first time?
v Define electromagnet. How many poles it has?
vi What is the basic difference between generator and motor?
vii Write two properties of α-particles.
viii Write the difference between fission and fusion reaction.
PART – II
NOTE: Attempt any TWO questions.
Q.5(a)
How does electrostatic air cleaner work, explain. 4
Q.5(b)
At one end of ripple tank 80 cm across, a 5 Hz vibrator produces waves whose wavelength is 40 mm. Find time the waves need to cross the tank. 5
Q.6(a)
Define ultrasound and write any three its uses. 4
Q.6(b)
The resistance of a conductor wire is 10MΩ. If a potential difference of 100 V is applied across its ends then find the value of current passing through it in mA. 5
Q.7(a)
What is meant by nuclear transmutation? Give examples of Alpha, Beta and Gamma decay. 4
Q.7(b)
An object 10.0 cm in front of a convex mirror forms an image 5.0 cm behind the mirror. What is the focal length of the mirror? 5
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