Inter (Part-I) Sahiwal 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.

• The formula for speed of satellite orbiting around the Earth is:

(a) v =
(b) v =
(c) v =
(d) v =

• Close orbiting satellites orbit the Earth at a height of about:

(a) 400 km
(b) 4000 km
(c) 400 m
(d) 400 cm

• One revolution is equal to:

(a) 2π rad
(b) π rad
(c) π/2 rad
(d) π/4 rad

• The pressure will be low, when speed of fluid is:

(a) Zero
(b) High
(c) Low
(d) Medium

• The product of frequency and time period is equal to:

(a) 1
(b) 2
(c) 3
(d) 4

• The velocity of sound in air at 0°C is:

(a) 332ms^-1
(b) 332cms^-1
(c) 220ms^-1
(d) 110ms^-1

• With the increase in temperature, speed of sound:

(a) Remains constant
(b) Becomes zero
(c) Decreases
(d) Increases

• The distance between two consecutive anti-nodes is:

(a) λ
(b) λ/4
(c) 2λ 
(d) λ/2

• The wavelength of x-rays is of the order of:

(a) 10^-8m
(b) 10^-9m
(c) 10^-7m
(d) 10-¹⁶m

• For glass - air boundary, the value of critical angle is:

(a) 41.4° 
(b) 41.6°
(c) 41.8°
(d) 42.2°

• The unit of entropy is:

(a) JK
(b) K/J
(c) J
(d) Jk^-1

• The ideal gas law is:

(a) Pv = NVK
(b) P = NKT
(c) PV = nRT
(d) P = nRT

• Significant figures in 0.00567 are:

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

• A vector in space has components:

(a) 1
(b) 2
(c) 3
(d) 4

• For maximum range, the angle of projection must be:

(a) 30°
(b) 45°
(c) 60°
(d) 90°

• If the mass of a body is doubled, then acceleration becomes:

(a) Double
(b) Half
(c) One fourth
(d) Constant

• Work is negative when angle between it and i; is:

(a) 0°
(b) 90°
(c) 45°
(d) 180°

Inter (Part-I) Bahawalpur 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)

• Write difference between random error and systematic error.
• Find dimensions of coefficient of viscosity " ղ " in the relation of Stokes' Law. (F = 6πղrv)
• Name several repetitive phenomenon occurring in nature which could serve as reasonable time standards.
• Write dimensions of (i) Pressure (ii) Density
• Write two examples of vector product.
• If one of the components of a vector is not zero, can its magnitude be zero? Explain.
• Name three different conditions that could make = A1xA2=0
• What is meant by instantaneous acceleration? Write its formula.
• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity, relative to velocity, while the object is in air.
• Define impulse and show that how is it related to linear momentum?
• At what point or points in its path does a projectile have its minimum speed, its maximum speed?
• Explain the working of a carburetor of a motor car using Bernoulli's principle.

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

• What do you mean by variable force? Give its two examples.
• Calculate the work done in kilo joules in lifting a mass of 10 kg (at steady velocity) through a vertical height of 10 m.
• When a rocket re-enters in the atmosphere, its nose cone become very hot. Where does this heat energy come from?
• Show that S = r0
• Differentiate between real and apparent weight.
• Why does a diver change his body positions before and after diving in the pool?
• What do you mean by free and forced oscillations?
• Can we realize an ideal simple pendulum? Explain briefly?
• How the resonance is applicable in microwave oven?
• How are beats useful in tuning musical instruments?
• Explain the terms node and antinode.
• Why ultrasonic waves are preferred on radio waves for the use of undersea communication?

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

• Define diffraction of light.
• An oil fill spreading over a wet footpath shows colors. Explain how does it happen?
• How would you manage to get more orders of spectra using a diffraction grating?
• Define magnification.
• How the light signal is transmitted through the optical fiber?
• Define isothermal process and adiabatic process.
• Define entropy and write its relation.
• Is it possible to convert internal energy into mechanical energy? Explain with an example.
• At thermos flask containing milk as a system is shaken rapidly. Does the temperature of milk rise? Explain.

SECTION-II

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

Question #5
(a) State and explain law of conservation of momentum.
(b) Find the angle between the two vectors 5i+j.a B =21-1-4j

Question #6
(a) What are geostationary orbits and geostationary satellite? Derive a relation for geostationary orbit.
(b) A car of mass 1000 kg at the top of an incline 10 m high and 100 m long is released and rolls down the hill. What is the speed at the bottom of the incline if the average retarding force due to friction is 480 N?

Question #7
(a) State and prove Bernoulli's equation.
(b) 336 J of energy is required to melt 1 gram of ice at 0°C. What is the change in entropy of 30 gram of water at 0°C as it I changed to ice at 0°C by a refrigerator?

Question #8
(a) Explain beats with example. Write its two uses.
(b) A block of mass 4 kg is dropped from a height of 0.80 m on to a spring of spring constant K = 1960Nm' . Find the maximum distance through which the spring will be compressed.

Question #9
(a) What is compound microscope? Draw rays diagram and derive expression for the magnification of compound microscope.
(b) In a double slit experiment the second order maximum occurs at 0 = 0.25° . The wavelength is 650 nm. Determine the slit separation.