Inter (Part-I) Multan 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 centripetal force is always directed:-

(A) Away from the centre along the radius
(B) Along the direction of motion
(C) Opposite to the motion of the body
(D) Towards the centre along the radius

• The frequency of rotation of a spaceship about its own axis to credit artificial gravity like that on earth is:-

(A) f =2π 
(B) f =
(C) f = 2
(D) f =

• 1 torr in Nm^-1 is expressed as:-

  (A) 130.5 Nm^-1
  (B) 133.3 Nm^-2
  (C) 135.3 Nm^-2
  (D) 140.3 Nm^-2 

• The frequency of waves produced in microwave over is:-

(A) 2250 MHz
(B) 2450 MHz
(C) 2650 MHz
(D) 2850 MHz

• The speed of sound in air does not depend upon:-

(A) Density
(B) Humidity 
(C) Temperature
(D) Pressure

• Stars moving towards earth show:-

(A) Blue shift
(B) Green shift
(C) Red shift
(D) Yellow shift

• The distance between two consecutive antinodes is:-

(A) λ/4
(B) λ/2
(C) λ
(D) 2λ

• Diffraction is a special type of:-

(A) Reflection
(B) Polarization
(C) Interference
(D) Refraction

• The light emitted from diode (LEd) has wave length:-

(A) 1.3 µm
(B) 1.4 µm
(C) 1.5 µm
(D) I .6 µm

• The actual efficiency of properly tuned petrol engine is:-

(A) 20 % to 30 %
(B) 30% to 35%
(C) 40% to 45%
(D) 25% to 30%

• A heat engine operates between the temperature 1000 K and 400 K. Its efficiency is:-

(A) 100 %
(B) 70 %
(C) 60 %
(D) 50 %

• The dimensions of angular momentum are:-

(A) [MLT^-2]
(B) [MLT^-1]
(C) [ML ²T^-1]
(D) [ML ^-2T^-2]

• If two non zero vectors and are parallel to each other then: -

(A) .  =0    
(B).   =AB
(C) ׀ x  ׀ =AB       
(D) ׀ x ׀ =.

• Maximum height of projectile is:-

(A) h=Vi² Sin²θ/2g
(B) h=Vi² Sin²θ/g
(C) h=Vi²/g
(D) h=Vi²/2g Sin²θ

• The mass of fuel consumed by a typical rocket to overcome earth's gravity is:-

(A) 10000 KgS^-1
(B) 1000 KgS^-1
(C) 100 KgS^-1
(D) 10 KgS^-1

• Escape velocity on the surface of earth is 11.2 KmS^-1 the escape velocity on the Surface on the plant of same mass as that of earth but of ¼ time of the radius of earth is:-

(A) 6 KmS^-1
(B) 2 KmS^-1
(C) 4 KmS^-1
(D) 8 KmS^-1

• The weight of the body at the centre of the earth is:-

(A) Slightly less
(B) Slightly greater
(C) Zero
(D) Infinite

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

Section I

2. Attempt any eight parts. (8x2=16)

• The period pendulum is measured by a stopwatch. What type or errors are possible in the time period?
• Show that the equation E=mc² is dimensionally consistent.
• Why do find it useful to have two units for the amount of substance, the kilogram and mole?
• Write the dimensions of (a) Pressure (b) Density
• Name three different conditions that could make ₁x₂ =0
• If one of the rectangular components of a vector is not zero, can its magnitude be zero? Explain.
• Define the terms Unit Vector and Position Vector.
• State Newton's Second Law of and -write its mathematical form.
• Explain the circumstances in which the velocity V and acceleration α of a car are (a) Anti-parallel (b) Perpendicular to one another
• Explain the difference between Elastic and Inelastic Collisions.
• Explain how would a bouncing ball behave in each case?
• An object is thrown vertically upward. Discuss the sign of acceleleration due to gravity, relative to velocity, while the is in air.
• Two row boats moving, parallel in the same direction are pulled towards each other. Explain.

3. Attempt any eight parts. 8x2=16

• When a rocket re-enters the atmosphere, its nose cone becomes very hot. Where does this heat energy come from?
• What type of energy is in the following? (i) Compressed spring (ii) A moving car
• State Work-Energy relation and write down its equation.
• What is meant by Momentum of Inertia? Explain its significance.
• Show that Orbital Angular Momentum L₁₁=mvr
• Find the rotational kinetic energy of a Disc.
• Name two characteristics of simple harmonic motion.
• Describe some common phenomenon in which resonance plays an important role.
• If a mass spring system is hung vertically and set into oscillations, why does the motion eventually stop?
• What is effect of variation of density on the speed of sound in a gas?
• As a result of distant explosion, an observe senses a ground tremor and then hears the explosion. Why?
• Is it possible for two identical waves travelling in the same direction along a string to give rise to a stationary waves?

4. Attempt any six parts. 6 x 2=12

• Write down selective absorption method to obtain polarized light from ordinary light.
• Under what conditions two or more sources of light behave as coherent sources?
• Why the Polariod sunglasses are better than ordinary sunglasses?
• Why would it be advantageous to use blue light with a compound microscope?
• Describe with the help of ray diagrams, how a single bi convex lens can be used as a magnifying glass?
• What is an Adiabatic Process? Also give its two examples.
• Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• Is it possible to construct a heat engine that will not expel heat into the atmosphere? Explain.
• Can the mechanical energy be converted completely into heat energy? If so, give an example.

SECTION-II

NOTE: - Attempt any three questions.

Question #5
(a) State and prove Law of Conservation or Linear Momentum. 5
(b) A load of 10N is suspended from a clothes line. This distorts the line so that it makes an angle of 15° with the horizontal at each end. Find the tension in the clothes line. 3

Question #6
(a) Describe Angular Momentum and discuss the Law of Conservation of Angular Momentum with one example. 5
(b) 100 m³ of water is pumped from a reservoir into a tank, 10m higher than the reservoir in 20 minutes. If density at water is 1000 kgm^-3, find the power delivered by the pump. 3

Question #7
(a)What is a Cannot Heat Engine? Explain four process of Carnot’s Cycle and derive formula for its efficiency. 5
(b) Water flows through a hose, whose internal diameter is 1 cm at a speed of 1 ms^-1. What should be the diameter of the nozzle if the water is to emerge at 21 ms¹? 3

Question #8
(a) What is simple pendulum? Show that its motion is S.H.M. Derive an expression for its time period. 5
(b) The frequency of the note emitted by it stretched string is 300 Hz. What will be the frequency of this note, when the length of the waves is reduced by one-third without changing the tension. 3

Question #9
(a) What are Newton’s spring? Describe the experiment of producing Newton’s rings look dark? 5
(b) A microscope has an objective lens of 10 mm focal length, and an eye piece of 25 mm focal length. What is the distance between the lenses and its magnification, If the object is in sharp focus when it is 10.5 mm from the objective? 3