Inter (Part-I) Sargodha Board 2016
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.

• How many nanometers in a meter?

(a) 10^-19
(b) 10¹⁹
(c) 10⁹
(d) 10^-9

• If the magnitude of A Then an angle between and is:

(a) 30°
(b) 45°
(c) 60°
(d) 90°

• A body having uniform acceleration of 10ms^-2 has a velocity of 100ms^-2. In what time its velocity will be doubled?

(a) 8 sec
(b) 10 sec
(c) 12 sec
(d) 14 sec

• At what speed the momentum and kinetic energy of a bod3 having the same value?

(a) 1ms^-1
(b) 2ms^-1
(c) 4ms^-1
(d) 8ms^-1

• A layer of rock holding water that allows water to percolate through it with pressure is called:

(a) Geyser
(b) Aquifer
(c) Steamvent
(d) Hot spring

• Which one of the following is not directed along the axis of rotation?

(a) Angular acceleration
(b) Angular momentum
(c) Centripetal acceleration
(d) Angular displacement

• If angular velocity of a particle rotated in circular path is doubled then its moment of inertia:

(a) Remains the same
(b) Becomes half
(c) Becomes doubled
(d) Increases by 4 times

• If a rocket in accelerating upword with an acceleration of 2 g, an astronaut of weight Mg in the rocket shows apparent weight.

(a) Zero
(b) Mg
(c) 2 Mg
(d) 3 Mg

• Venturimeter is used to measure:

(a) Speed of fluid
(b) Pressure of fluid
(c) Volume of fluid
(d) Mass of fluid

• The velocity of a particle having SHM is v at mean position. If its amnlitude is doubled then velocity at mean position will be energy:

(a) Remain the same
(b) Increases by two times
(c) Increases by 4 times
(d) Decreases to half

• Increase in velocity of sound in air for 1°C rise in temperature is:

(a) 0.61cms^-1
(b) 61cms^-1
(c) 0.61ms^-1
(d) 61ms^-1

• Phase difference between two points of a wavefront is:

(a) Zero
(b) π/2
(c) π
(d) 3π/2

• Rayleigh formula for resolving power:

(a) R =1.22 λ/D
(b) R =1.22 λ/D
(c) R =1.22 D/λ
(d) R =λ/1.22D

• Pressure of a gas is given as:

(a) (V²)
(b) (V²)
(c) (V²)
(d) None of these

• In thermodynamics system internal energy decreases by 100J and 100 J of work is done on the system then heat lost will be:

(a) Zero
(b) 100 J
(c) 200 J
(d) -200 J

Inter (Part-I) Sargodha Board 2016
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83

Section I

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

• Name several repetitive phenomenon occurring in nature which could serve as reasonable time standards.
• Write the dimensions of pressure and density.
• Define random and systematic error.
• Define radian and steradian.
• Name three different conditions that could make A_l x A₂ =0.
• Why can a body not rotate about its centre of gravity under the action of its weight? Define unit vector and position vector.
• Define impulse and how it is related to linear momentum?
• Define projectile motion and derive the expression for the range of projectile.
• Show that range of projectile is maximum when it thrown at an angle of 45° with the horizontal.
• At what point or points in its path does a projectile have its maximum and minimum speed?
• Explain, how the swing is produced in a fast moving cricket ball?

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

• A ball of mass m is held at a height h₁ above a table. The table top is at a height h₂ above the floor. One student says that its Pt is mg(h₁+h₂) and other says that PE is mgh (h₁ + h₂) . Who is correct?
• A boy uses a catapult to throw a stone which accidently smashes a green house window, list the possible energy changes?
• How energy is obtained from direct combustion and fermentation.
• Prove that v=r
• Define moment of inertia, how it is related to torque?
• When mud flies off the type of a moving bicycle in what direction does it fly, explain it.
• Differentiate between damped oscillation and undamped oscillations.
• Define phase angle with diagram.
• Name two characteristics of simple harmonic motion.
• Is it possible for two identical waves travelling in same direction along a string to give rise a stationary waves.
• Why sound travel faster in warm air than in cold air explain briefly?
• Give two applications of Doppler's effect.

4. Attempt any SIX short questions. (6 x 2 =12)

• Define diffraction grating.
• Why the polaroid sunglasses are better than ordinary sunglasses?
• How is the distance between interference fringes affected by the separation between the slits of Young's experiment? Can fringes disappear?
• Define resolving power of an optical instrument.
• Define pressure of a gas.
• One can buy a cheap microscope for use by the children. The images seen in such a microscope have coloured edges. Why is this so?
• Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• Give an example of a process in which no heat is transferred to or from the system but the temperature of the system changes.
• Is it possible to construct a heat engine that will not expel heat into the atmosphere. Explain briefly.

SECTION-II

Attempt any THREE questions. (8 x 3 = 24)

Question #5
(a) Define projectile motion. Derive formulas for: (i) Time of light (ii) Horizontal range, for projectile
(b) The magnitude of dot and cross products of two vectors are 6 and 6 respectively. Find the angle between the vectors.

Question #6
(a) Define conservative field and prove that work done is independent of the path followed by the body in gravitational field.
(b) A gramophone record turntable accelerates from rest to angular velocity of 45.0 rev min^-1 in 1.60 s. What is its average angular acceleration?

Question #7
(a) What is carnot engine? Explain the carnot cycle and calculate the efficiency of carnot heat engine.
(b) An Airplane wing is designed so that when the speed of air across the top of the wing is 450ms^-1, the speed of air below the wing is 410ms^-1. What is the pressure difference between top and bottom wing? Density of air = 1.29kgm^-3

Question #8
(a) What is Doppler's effect. Find the relations for modified frequencies, when:

• An observer moves towards a stationary source.
• A source moves towards a stationary observer.

(b) What should be the length of a simple pendulum whose period is 1.0 second at a place where g = 9.8ms^-2 . What is the frequency of such a pendulum?

Question #9
(a) A heat engine performs 100 J of work and at the same time rejects 400 J of heat to the cold reservoirs. What is the efficiency of the engine?
(b) State and prove Bernoulli's equation.