Inter (Part-I) Faisalabad Board 2015
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.

• Which has maximum viscosity?

(a) Air
(b) Water
(c) Acetone
(d) Glycerin

• A quantity which indicates, the state and direction of a vibrating body is known as:

(a) Time period
(b) Amplitude
(c) Phase
(d) Frequency

• The speed of sound is greater in solids due to their high:

(a) Density
(b) Pressure
(c) Temperature
(d) Elasticity

• When two identical waves move in the opposite direction, they give rise to:

(a) Stationary waves
(b) Beats
(c) Constructive interference
(d) Destructive interference

• In sonar we use:

(a) Sound waves
(b) Ultrasound waves
(c) Radio waves
(d) Microwaves

• The (rings spacing increases if we use:

(a) Red light
(b) Blue light
(c) Yellow light
(d) Green light

• Which is not the essential component of a spectrometer?

(a) Collimator
(b) Telescope
(c) Turntable
(d) Microscope

• Which remains constant in an adiabatic process?

(a) Volume
(b) Pressure
(c) Entropy
(d) Temperature

• Which is an example of irreversible process?

(a) Explosion
(b) Evaporation
(c) Slow compression
(d) Liquefaction

• Which pair has same dimensions?

(a) Work and power
(b) Momentum and impulse
(c) Force and torque
(a) Toque and power

• The area of the parallelogram formed by Ā and Ḃ as two adjacent sides is equal to :

(a) AB
(b) AB cos θ
(c) AB sin θ
(d) AB tan θ

• The slope of velocity time graph shows the:

(a) Total distance covered by the body
(b) Average acceleration of the body
(c) Average force acting on the body
(d) Total work done on the body

• The mass of an object is quantitative measure of its:

(a) Momentum
(b) Acceleration
(c) Inertia
(d) Energy

• All the food we eat in one day has about the same energy as:

(a) One liter of petrol
(b) liter of petrol
(c) liter of petrol
(d) liter of petrol

• All points on a rigid body rotating about a fixed axis do not have same.

(a) Speed
(b) Angular speed
(c) Angular acceleration
(d) Angular displacement

• Moment of inertia of a solid sphere is:

(a) Mr²
(b) mr²
(c) mr²
(d) mr²

• Which is unimportant in describing the satellite's orbit?

(a) Distance of satellite from earth's center
(b) Gravitational constant G
(c) Mass of satellite
(d) Mass of earth

Inter (Part-I) Faisalabad 2015
Physics
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83 

Section I

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

• The time period of a simple pendulum is measured by a stop watch. What type of errors are possible in time period?
• Write the dimensions of pressure and density?
• How many nanoseconds are in one year?
• What is difference between precision and accuracy?
• The vector sum of three vectors give a zero resultant. What can be the possible orientation of the vectos?
• Name three different conditions that could make Ā₁ x Ā₂ = 0.
• You are falling off the edge. What should you do avoid falling?
• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity relative to velocity, while the object is in air?
• Show that rate of change in momentum for an object is equal to applied force.
• Does a moving object have impulse?
• Explain what is meant by projectile motion. Give an example.
• Why fog droplets appear to be suspended in air?

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

• A girl drops a cup from a certain height which breaks into pieces. What energy changes are involved?
• An object has 1.0 Joule of potential energy. Explain what does it mean?
• Explain the circumstance in which work done is negative and no work is done even force is applied.
• Define critical velocity and find its value.
• Explain what is meant by centripetal force and why it must be furnished to an object is the object is to follow a circular path?
• Define moment of inertia. Explain its significance.
• Name two characteristics of simple harmonic motion.
• If a mass spring system is hung vertically and se into oscillations, why does the motion eventually stop?
• What is difference between free and forced oscillations?
• Is it possible for two identical waves travelling in the same direction along a string to give rise to a stationary wave?
• What is difference between longitudinal and transverse wave?
• Explain beats with example.

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

• Define wave front and a ray of light.
• What aspect of nature of light is proved by phenomena of polarization?
• Why the Polaroid sunglasses are better than ordinary sunglasses?
• What do you understand by linear magnification and angular magnification?
• How convex tens is used as shn pie microscope? What is its magnification.
• Why is the average velocity of molecules in a gas zero but average of square of velocities is not zero?
• A heat engine works between 327^oC and 27^oC. Find its efficiency.
• Specific heat of gas at constant pressure is greater heat at constant volume. Why?
• Does entropy of the system increase or decrease due to friction?

Section-III

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

Question #5
(a) Define scalar product with examples. Write down its any four characteristics.
(b) Find angle of projection of a projectile for which its maximum height and horizontal range are equal.

Question #6
(a) Define rotational kinetic energy. Show that a disc will be moving faster than a hoop on reaching the bottom of an inclined plane, when thrown at the same time.
(b) The bricks, each 6.0 cm thick and mass 1.5kg, lie flat on a table. How much work is required to stack them one on the top of other.

Question #7
(a) Define simple pendulum. Alsocalculate its time period.
(b) An organ pipe has a length 50cm. Find the frequency of its fundamental note and the next harmonic when it is open at both ends. (Speed of sound = 350ms^-1).

Question #8
(a) Discuss Michelson’s interferometer.
(b) An astronomical telescope having magnifying power of 5 consist of two thin lenses 24cm apart. Find the focal lengths of the lenses.

Question #9
(a) Define terminal velocity. Prove that the terminal velocity of a fog droplet is directly proportional to the square of the radius of the fog droplet.
(b) A sample of gas is compressed to one half of its initial volume at constant pressure of 1.25 x 10⁵Nm^-2. During the compression, 100J of work is done on the gas. Determine the final volume of the gas.

Section-IV

(a) Attempt any THREE questions. (5 x 3 = 15)

• What is resonance?
• What is the use of screw gauge?
• Define angle
• What is spring constant?
• What is meant by the pitch of the screw gauge?
• What is meant by moment of force?
• What is hook Law

Write down the brief procedure to find out diameter of a cylinder using Vernier calipers

OR

Write down the brief procedure to find the refractive index of a material of a prism by critical angle method.

Answer the following Question on the basis of graph below.