Physics (New Scheme)
Inter Part-I
Gujranwala Board 2016
Paper: I
Time: 20 Minutes
OBJECTIVE
Marks: 17

Note: You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave others blank.

• Stars moving towards the earth show:

(A) red shift
(B) blue shift
(C) yellow shift
(D) green shift

• No body begins to move or comes to rest of itself was given by:

(A) Newton
(B) Pascal
(C) Bernoulli
(D) Bu Ali Sena

• One radian is equal to:

(A) 53.7°
(B) 55.7°
(C) 57.4°
(D) 57.3°

• Moment of inertia of a sphere is:

(A) 1/2mr²
(B) 2/5mr²
(C) 2/5mr³
(D) 1/3 mr²

• Cloud formation in atmosphere is an example of:

(A) isothermal process
(B) isochoric process
(C) adiabatic process
(D) isobaric process

• In multimode step index fibre, the diameter of core is:

(A) 50 µ m
(B) 5 µ m
(C) 100 µ m
(D) 150 µ m

• One light year is equal to:

(A) 9.5x10¹⁵m
(B) 9.5x10^-15m
(C) 9.5x10¹⁴m
(D) 9.5x10¹²m

• Efficiency of Steam locomotive is:

(A) 10%
(B) 8%
(C) 9%
(D) 7%

• The distance between two adjacent bright or dark fringes is:

(A) ∆y= Lλ/d
(B) ∆y= λ/d
(C) ∆y= λ/Ld
(D) ∆y= Ldλ

• S.I unit of work is:

(A) Newton
(B) Watt
(C) Pascal
(D) Joule

• The value of angular momentum is maximum when θ is:

(A) 90°
(B) 60°
(C) 45°
(D) 0°

• Speed of moon around the earth is:

(A) 1200 m/s
(B) 1100 m/s
(C) 1000 m/s
(D) 900 m/s

• The S.1 unit of viscosity is:

(A) kg m^-1 s^-1
(B) kg m^-1 s
(C) kg m^-1 s^-2
(D) kg m s

• Dot product of vector with itself is:

(A) zero
(B) 2 A
(C) A2
(D) A

• The waves produced in microwave oven have a wave-length of:

(A) 12 cm
(B) 12 m
(C) 18 m
(D) 18 cm

• Velocity of sound is independent of:

(A) temperature
(B) pressure
(C) density
(D) medium

• Speed of sound in copper is:

(A) 38000 m s-1
(B) 3600 m s^-1
(C) 3500 m s^-1
(D) 3400 m s^-1

Physics
(New Scheme)
Inter Part-I
Gujranwala Board 2016
Paper: I
Time: 2.40 Hours
SUBJECTIVE
Marks: 68

Note: Section I is compulsory. Attempt any Three (3) questions from Section II.

(SECTION - I)

2.Write short answers to any Eight questions: (2x8=16)

• Does a dimensional analysis give any information on constant of proportionality that may appear in an algebraic expression? Explain.
• Define systematic errors. Explain, how can we remove the effect of systematic errors?
• Define radian and steradian.
• Add the following masses given in kg up to appropriate precision 189, 0.089, 11.8 and 5.32
• How can we subtract the vectors?
• Under what circumstances would a vector have components that are equal in magnitude?
• Why can a body not rotate about its centre of gravity under the action of its weight?
• Define momentum and give its unit.
• Define impulse and show that how it is related to linear momentum?
• Motion with constant velocity is a special case of motion with constant acceleration. Is this statement true? Discuss.
• At what point or points in its path does a projective have its minimum speed, its maximum speed?
• A person is standing near a fast moving train. Is there any danger that he will fall towards it? Discuss.

3.Write short answers to any Eight questions: (2x8=16)

• Show that p = F. v
• A boy uses a catapult to throw a stone which smashes a window. List the energy changes.
• An object has 1 J of potential energy. Explain what does it mean.
• Prove the relation between linear velocity and angular velocity.
• Describe what should be the minimum velocity, for a satellite, to orbit close to the Earth around it.
• Why a diver changes his body position before and after diving in the pool?
• Does frequency depend upon amplitude for a harmonic oscillator?
• What is meant by phase angle?
• Show that in SHM, the acceleration is zero when velocity is greatest and velocity is zero when acceleration is greatest.
• How are beats useful in tuning a musical instrument?
• Explain, why sound travels faster in warm air than in cold air?
• What is the effect of pressure and temperature on the speed of sound?

4.Write short answers to any SIX questions: (2x6=12)

• Define polarization of light.
• Can visible light produce interference fringes? Explain.
• How would you manage to get more orders of spectra using a diffraction grating?
• Write function of collimator in spectrometer.
• How light signal is transmitted through the optical fibre?
• Derive Boyle's Law from the expression for pressure of gas.
• Why is the average velocity of the molecules in a gas zero but the average of the square of velocities is not zero?
• Is it possible to convert internal energy into mechanical energy? Explain with an example.
• Does entropy of a system increases or decreases due to friction? Explain.

SECTION - II

5. (a) Explain the addition of vectors by rectangular components method. (3)
(b) A bomber dropped a bomb at a height of 490 m when its velocity along the horizontal was 300 km hrl. At what distance from the point vertically below the bomber at the instant the bomb was dropped, did it strike the ground?

6. (a)Definer energy. Prove that K.E.=1/2mv². Also derive work energy relation. (5)
(b)The earth rotates on its axis once a day. Suppose by some process, the earth contracts so that its radius is only half as large as at present. How fast will it be rotating then? ( For sphere I=2/5MR² )

7. (a) Derive Bernoulli's equation. (5)
(b)Find the average speed of oxygen molecule in the air at S.T.P. (3)

8. (a)What is simple pendulum? Derive an expression for its time period and frequency of pendulum. (5)
(b)The absorption spectrum of faint galaxy is measured and wavelength of one of the lines identified as the calcium line is found to be 478 nm. The same line has a wavelength of 397 nm, when measured in laboratory. Find speed of galaxy relative to earth. (3)

9. (a)What is Michelsons interferometer? Explain its working and derive its equation. (5)
(b)A glass light pipe in air will totally internally reflect a light ray if its angle of incidence is at least 39°. What is the minimum angle for total internal reflection if pipe is in water? (For water refractive index in 1.33) (3)