Army public school and college khanewal
Schedule test 4 ( chp7 & 9)
Name: __________ Class/Section XI/ Date: _______ Subject: Physics
Q1. Choose the best answer
1. In an isolated system the total energy of vibrating mass and spring is
a) Variable b) low c) high d) constant
2. Tuning of a radio set is an example of……..
a) Mechanical resonance b) musical resonance c) electrical resonance d) free oscillation
3. A body is said to be executing free vibrations if it oscillates with its…………… frequency without the interference of
an external force
a) Neutral b) resonance c) maximum d) natural
4. The longer the pendulum greater will be the ……………….
a) Velocity b) time period c) frequency d) none
5. T=2s………………..
a) 2nd pendulum b) 1st pendulum c) time period d) none
6. Law of conservation of energy is conserved in ………
a) Resonance b) S.H.M c) damped oscillation d) none
7. The energy of damped oscillations system ………… due to the work done against friction
a) Increase b) decrease c) same d) none
8. At resonance the amplitude of vibration become very large when damping is………..
a) Large b) remain same c) increase slowly d) small
9. The principle of young double slits experiment is based on the division of
a) Amplitude b) frequency c) velocity d) wavelength
10. Coloured finges observed in soap bubbles are the example of
a) Diffraction b) interference c) polarization d) reflection
11. Signal from a remote control to the device operated by it travels with the speed of
a) Sound b) light c) ultrasonic d) supersonic
12. The tip of niddle does not give a sharp image it is due to
a) Polarization b) interference c) diffraction d) reflection
13. During a sunny day we see the objects in a class rooms even when all the electric light are off due to
a) Reflection of light b) refraction of light c) diffraction of light d) interference
14. In ………………………. Thomas young performed his famous double slit experiment
a) 1801 b) 1802 c) 1803 d) 1804
15. Monochromatic or single colour light is specified by a …………………wavelength
a) Single b) normal c) coherent d) none
16. Grating spectrometer is used to calculate the ………………………
a) Wavelength b) frequency c) amplitude d) none
17. X-rays are electromagnetic wave of very short wavelength of the order of
a) 10-1 b) 10-2 c) 10-3 d) 10-4
Q2. Short answer the following questions ( s0lve any seven )
1. 1.what will be the frequency of a simple pendulum if its lengths is 1m
2. Define simple pendulum . what are the drawbacks of simple pendulum? Can simple pendulum
experiment be done inside a satellite?
3. can we legalize an ideal simple pendulum? What happens to the period of a simple pendulum if its
Length is doubled? What happens if the suspended mass is doubled?
4. A singer holding a note of right frequency can shatter a glass. Explainatin
5. explain what is meant by damped oscillations
6. give one practical example each of free and forced oscillation
7. Explain why in S.H.M the acceleration is zero when the velocity is greater
8. A mass at the end of the spring describe SHM with T=0.40s. find out acceleration when the
Displacement is 0.04m.
9. What should be the length 0f simple pendulum whose time period is one second ? what is its frequency?
10. What happed to the frequency of simple pendulum as it oscillation die down from large amplitude to small
Q3. Short answer the following questions ( s0lve any seven )
1. A soap bubble looks black when its burst why?
2. What is difference between interference and diffraction?
3. How u can u explain brewster law of polarization?
4. Can u apply hydeng principle to radar wave?
5. How would u justify that light waves are transverse wave?
6. What is mean by the path difference with reference to the interference of two wavemotion
7. Why it is not possible to see the interference where the light beam from the head lamps of a car overlap
8. Find the polarizing angle for a glass of refractive index of 1.55
9. A diffraction grating has 5000 lines per centimeter . at what angle does the second order spectrum of the sodium
yellow light of wavelength 589 nm occur?
10. What is meant by the dual nature of light? Discuss the history about the nature of light in detail
Q4. Long questions ( solve any seven )
1.a) A body of mass m suspended from a spring with force constant k vibrates with f1. When its le
lengthIs cut into half and the same body is suspended from one of the halves the frequency f2.
Find out f1/f2?
b). Show that energy is conserved in S.H.M
2.a) Explain about polarization of light
b) state and explain huygen principle . what is the difference between spherical and plane wave front
3.a) ) find the amplitude frequency and time period of an object oscillating at the end of a spring
if the equation for this position at any instant t is given by x= .25cosπ/8t. find the displacement of the object after 2.0s
b). A soap film has a refractive index of 1.40 . how thick must the film be . if it appear black when mercury light of
wavelength 546.1nm falls on it normally?
