Inter (Part-I) Sargodha Board 2014
Physics
Part I (Objective Type)
Time Allowed: 20 Minutes 
Max. 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.

Question #1 
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• One light year is equal to:

(a) 9.46 x 10¹⁵mm
(b) 9.46 x 10¹⁵cm
(c) 9.46 x 10¹⁵ m
(d) 9.46 x 10¹⁵ km

• A force of 10N is acting along x-axis, its y-component is:

(a) 10 N
(b) √10 N
(c) Zero
(d) 1 N

• Motion of projectile is:

(a) One dimension
(b) Two dimensional
(c) Three dimensional
(d) Four dimensional

• The work done by the body will be negative if:

(a) ɵ= 0^o
(b) ɵ = 90 ^o
(c) ɵ > 90^o
(d) ɵ < 90 ^o

• Time rate of change of momentum is:

(a) Velocity
(b) Impulse
(c) Force
(d) Pressure

• Centripetal force acting on body performs:

(a) No work
(b) Maximum work
(c) Minimum work
(d) Both B and C

• The geostationary satellites required to coner the whole earth are:

(a) 2
(b) 3
(c) 4
(d) 5

• The dimensions of angular velocity are:

(a) T^-1
(b) LT^-1 
(c) L^-1T
(d) L^-1T^-1

• The law of conservation of mass is related to:

(a) Bernoulli,s theorem
(b) Equation of continuity
(c) Stoke's law 
(d) Viscosity

• When the bob of simple pendulum is at extreeme position, Its kinetic energy is:

(a) Maximum
(b) Negative 
(c) Small
(d) Zero

• When the amplitude of a wave becomes double, its energy becomes:

(a) Double
(b) Four times
(c) One half
(d) Nine times

• The waves associated with particles in motion are called:

(a) Light waves
(b) Electromagnetic waves
(c) Matter waves
(d) Both A and B

• Which phenomena proves that light waves are transverse in nature:

(a) Interference
(b) Polarization
(c) Diffraction
(d) Both A and C

• The image of an objec 5 mm is 1 cm high. The magnification of lens will be:

(a) 1
(b) 2 
(c) 3
(d) 5

• If C_v is the molar heat capacity at constant volume and ∆T is the temperature then C_v∆T gives.

(a) Area
(b) Energy
(c) Volume
(d) Density

• A good example of first law of thermodynamics is:

(a) Simple pendulum
(b) Centripetal force
(c) Bicycle pump
(d) Doppler's effect

• The distance covered by a body in one complete vibration is 20 cm, What is the amplitude of the body:

(a) 10 cm
(b) 5 cm
(c) 15 cm
(d) 7.5 cm

Inter (Part-I) Sargodha Board 2014
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

2. Attempt any EIGHT short questions. (8 x 2 = 16)

• Show that the famous Einstein equation E = mc² is dimensionally consistent.
• Write the dimensions of (a) pressure (b) Density
• How many years in one second?
• What is the difference between biological sciences and physical sciences.
• State the two conditions of equilibrium.
• What is the unit vector in the direction of the vector A= 4î + 3j) .
• Name the three conditions that could make A₁ x A₂ = 0.
• Can the velocity of an object reverse the direction when the acceleration is constant.
• Show that the range of projectile is maximum when projectile is thrown at an angle of 45^o with the horizontal.
• Explain the difference between elastic and inelastic collisions.
• State Newton's third law of motion with an example.
• Explain how the swing is produced in a fast moving cricket ball.

3. Attempt any EIGHT short questions. (8x2=16)

• An object has 1 J of potential energy. Explain w hat does it mean.
• A boy uses a catapult to throw a stone which accidentally smashes a green house window. List the possible energy changes.
• What is Geothermal energy?
• Explain the difference between tangential velocity and the angular velocity. If one of these is given for a wheel of known radius, how will you find the other?
• Describe what should be the minimum velocity, for a satellite to orbit close to the earth around it.
• Why does a diver change his body positions before diving in the pool.
• Does frequency depends on amplitude for harmonic oscillators.
• In the relation to S.H.M. Explain the equations.
• What is the total distance travelled by an object moving with S.H.M in a time period, if its amplitude is A?
• How are beats useful in tuning musical instruments?
• As a result of a distant explosion, an observer senses a ground tremor and then hears the explosion. Explain the time difference.
• What features do longitudinal waves have in common with transverse waves?

4. Attempt any SIX short questions. (6x2=12)

• How would you manage to get more orders of spectra using a diffraction grating?
• Why the Polaroid sunglasses are better than ordinary sunglasses?
• What do you mean by selective absorption?
• How the power is lost due to dispersion. Explain
• What is spectrometer? Give its uses.
• Can a mechanical energy be converted completely into heat energy. If so give an example.
• A thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise?
• What is entropy? Give its mathematical relation.
• Differentiate between reversible and irreversible process with example.

SECTION-II

 Attempt any THREE questions. (8x3=24)

Question #5
(a) Define vector product. Discuss right hand rule. Describe its characteristics. (1+3+1)
(b) A foot ball is thrown upward with an angle of 30^o with respect to the horizontal. To throw a 40 m pass what must be the initial speed of the ball. (3)

Question #6
(a) What do you understand by artificial gravity? Derive an expression for frequency with which a space- ship rotates to provide artificial gravity like earth. (4)
(b) A 70 kg man runs up a long flight of stairs in 4.0 sec. The vertical height of the stairs is 4.5m. Calculate his power output in watts. (4)

Question #7
(a) Discuss energy conservation in simple harmonic motion. (5)
(b) A stationary wave is established in a string which is 120cm long and fixed at both ends. (3)

Question #8
(a) What is meant by polarization. Also discuss various methods to obtain plane polarized light from un-polarized light. (4)
(b) A telesope is made of an objective of focal length 20cm and an eye piece of 5.0 cm, both convex lenses. Find angular magnification. (4)

Question #9
(a) State Bernoulli's Equation, give its principle, also derive it? (5)
(b) 336 J of energy is required to melt 1 g of ice at 0^oC . What is the change in entropy of 30 g of water at 0^oC as it is changed to ice at 0^oC by refrigerator? (3)

SECTION-IV

Question #10 (a)Attempt any Four questions. (5x3=15)

• Define critical angle.
• Define total internal Reflection.
• Define Focus and Focal length.
• What is resonance?
• What is end correction?
• What is the use of screw guage?
• What is the resolution of a vector?
• What is the difference between mass and weight of a body?

(b) Write down the brief procedure to find experimentally the focal length of a convex lens by displacement method.
OR
Write down the brief procedure to find experimentally the volume/diameter of a cylinder using Vernier callipers. (3)

(c) Answer the following questions on the basis of graph below. (4)

• What do you infer from graph?
• (Find the value of g from formula g=2h/t²cm^-2

OR

• What does the graph indicate?
• Find the slope of the graph.