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Subjective PHY I

This physics exam covers several topics in mechanics, waves, thermodynamics and optics. It contains 4 sections with multiple choice and long answer questions. Section 1 has 16 marks worth of questions on vectors, simple harmonic motion, projectiles and other topics. Section 2 is similar with 16 marks and questions on constant acceleration, satellite motion, and more. Section 3 has 12 marks of questions on interference, diffraction, microscopes and other optics topics. Section 4 provides 24 marks worth of longer answer questions, including topics like the Carnot cycle, sound waves, vectors, projectile motion, geostationary satellites and Michelson's interferometer. The exam allows 2 hours and 40 minutes for students to complete all sections totaling 68

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AR Malik
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60 views2 pages

Subjective PHY I

This physics exam covers several topics in mechanics, waves, thermodynamics and optics. It contains 4 sections with multiple choice and long answer questions. Section 1 has 16 marks worth of questions on vectors, simple harmonic motion, projectiles and other topics. Section 2 is similar with 16 marks and questions on constant acceleration, satellite motion, and more. Section 3 has 12 marks of questions on interference, diffraction, microscopes and other optics topics. Section 4 provides 24 marks worth of longer answer questions, including topics like the Carnot cycle, sound waves, vectors, projectile motion, geostationary satellites and Michelson's interferometer. The exam allows 2 hours and 40 minutes for students to complete all sections totaling 68

Uploaded by

AR Malik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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PHYSICS 1st YEAR

Time Allowed 2:40 Hour SUBJECTIE PART Maximum Marks : 68

SECTION-I

Q 2. Write the answers to any EIGHT parts 16


(i) What are the drawbacks to use period of pendulum as a time standard ?
(ii) Write the dimensions of Pressure and Density ?
(iii) If ⃗𝑨 + ⃗𝑩
⃗ = 𝟎 then what can you say about the components of the vectors ?
(iv) Can a body rotate about its center of gravity under the action of its weight ?
(v) Write the physical significance of vector product ?
(vi) Define conservative force ? Also give example ?
(vii) When a rocket re-enters the atmosphere then its nose cone become hot . Where does this heat energy come
from ?
(viii) Define Bernouli’s theorem ?
(ix) A person is standing near a fast moving train , is there any danger that he will fall towards the train ?
(x) Can we realize an ideal simple pendulum ?
(xi) Define resonance and write its uses ?
(xii) A spring is hung vertically and set into oscillations . Why does the spring eventually stops ?
Q3. Write the answers to any EIGHT parts 16
(i) Show that range of projectile is Maximum at 𝟒𝟓𝒐 ?
(ii) Can the velocity of an object reverses its direction when its acceleration is constant ? Explain .
(iii) Motion with constant velocity is a special case of motion with constant acceleration , Why ?
(iv) Define retardation ?
(v) Why does the diver change his body positions before and after diving in the pool ?
(vi) Prove that a = r 𝜶 ?
(vii) Describe what should be the minimum velocity for a satellite to orbit close to the earth around it ?
(viii) Define law of conservation of angular momentum ?
(ix) What features do longitudinal waves have in common with transverse waves ?
(x) Why does sound travel faster in solids than in gasses ?
(xi) How beats are useful in tuning the musical instruments ?
(xii) What is meant by blue shift ?
Q 4. Write the answers to any SIX parts 12
(i) Under what conditions two sources of light behave as coherent sources ?
(ii) Explain whether Young’s Experiment is an experiment for studying interference or diffraction effects of
light ?
(iii) How would you get more order of spectra using a diffraction grating ?
(iv) Why the central spot of newton rings is dark?
(v) Why it would be advantageous to use blue light in a compound microscope ?
(vi) How the light signal is transmitted in optical fiber ?
(vii) Why 𝑪𝒑 > 𝑪𝒗 ?
(viii) Give an example of natural process which involves an increase in entropy ?
(ix) Why does pressure of gas in a car tyre increase when it is driven through some distance ?
Attempt any three questions SECTION - II ( 8× 3 = 24)
Q 5. (a) What is Carnot Engine ? Explain Carnot’s Cycle and discuss its efficiency ?

(b) The speed v of a sound wave may be assumed to depends on (i) the density 𝝆 of the medium and
(ii) its modulus of elasticity E which is the ratio of stress to strain . Deduce by the method of
dimensions the formula for the speed of sound ?
Q 6. (a) Discuss the method of vector addition by rectangular components in Detail ?
(b) A 1500 kg has its velocity 20 𝒎𝒔−𝟏 to15 𝒎𝒔−𝟏 in 3.0 s. How large was the average retarding force ?

Q 7. (a) Discuss the effect of temperature on the speed of sound and show that for one degree celsius
rise in temperature , the speed of sound is increased by 61𝒄𝒎𝒔−𝟏 ?

(b) A brick of mass 5kg is dropped from a rest position 5.0 m above the ground . What is the velocity
at a height 3.0 m above the ground ?

Q 8. (a) Define Geostationary satellite and find its orbital radius ?

(b) Find the amplitude frequency and period of an object vibrating at the end of spring , if the
𝝅
equation of its motion as a function of time is 𝒙 = 𝟎. 𝟐𝟓 𝐜𝐨𝐬 𝟖 𝒕 . What is the displacement of the object
after 2.0 s ?

Q 9. (a) Describe the principle , construction and working of Michelson’s interferometer . How can
you find the wavelength of the light used ?

(b) A telescope is made of an objective lens of focal length 20cm and an eyepiece of 5cm , both are
convex lenses . Find the angular magnification ?

GOOD LUCK………..

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