paper of 12 to 17 short_1
TRANSCRIPT
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8/2/2019 Paper of 12 to 17 Short_1
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TEST OF 2ndYEAR PHYSICS CHAPTER# 12TO17 SHORT+PROB
Q#1:
Electric lines of forces never cross each other. Why?
Q#2:
Do electrons tend to go to region of high potential or of low potential?
Q#3:
Is E necessarily zero inside a charged rubber balloon if balloon is
spherical? Assume that charge is distributed uniformly over the surface?
Q#4:
How can you identify that which plate of a capacitor is positively charged?
Q#5:
Do bends in wire effects its electrical resistance?
Q#6:
Why does the resistance of a conductor rise with temperature?
Q#7:
What is the wheat stone bridge? How can it be used to determine anUnknown resistance?
Q#8:
Describe a circuit which wills give a continuously varying potential?
Q#9:
Why does the picture on TV screen become distorted when a magnet is
Brought near the screen?
Q#10:
How can a current loop be used to determine the presence of a
magnetic field in a given region of space?Q#11:
Why the resistance of an ammeter should be very low?
Q#12:
Why the voltmeter should have a very high resistance?
Q#13:
How can you use a magnetic field to separate isotopes of chemical element?
Q#14:
If a charged particle moves in a straight line through some region of space,
can you say that the magnetic field in the region is zero?
Q#15:Can a D.C motor be turned into a D.C generator? What changes are
Required to be done?
Q#16:
Does the induced emf always act to decrease the magnetic flux
Prepared By:
Asif Rasheed BS(Hons) Physics
Contact# 0344-7846394,0323-7690026
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TEST OF 2ndYEAR PHYSICS CHAPTER# 12TO17 SHORT+PROB
through a circuit?
Q#17:
Show that and e/t have same units?
Q#18:
In a R-L circuit, will the current lag or lead the voltage?
Illustrate your answer by a vector diagram.
Q#19:
Define stress, young modulus and strain .Give their units.
Q#20:
What is meant by para,dia and ferromagnetic substances?Give examples?
Q#21:
Write a note on super conductor?
Q #01:
Find the electric field strength require to hold suspended a particle of
mass 1.0 X 10-6 kg and charge 1.0 between two plates 10.0cm apart.Q # 02:
A rectangular bar of iron is 2.0cm by 2.0 cm in cross section and 40
cm long calculate its resistance if receptivity of iron is 11 x 10-8 m.
Q#03:
A wire 2.5 cm long and cross sectional area 10-5 m2 is stretched 1.5mm
by a force of 100 N in the elastic region .calculate Youngs modulus and
stored energy in the wire. .
Q #04:
A 1.25 cm diameter cylinder is subjected to a load of 2500 kg
.calculate the stress on the bar in mega pascals.
Q #05:
The back emf in a motor is 120 V when the motor is turning at 1680
rev per min.What is the back emf when the motor is turns 3360 rev per min?
Q #06:
What current should pass through a solenoid that is 0.5 m long with
10,000 turns of copper wire so that it will have a magnetic field of 0.04 T?
Q #07:
A capacitor of 2.5 x 10-8 F .in the charging process, electrons are
removed from one plate and placed on the other one. When the potentialdifference between the plates is 450 v, how many electrons will transferred?
Q #08:
What is the resonance frequency of a circuit which includes a coil of
inductance 2.5 H and capacitance of 40f?
Prepared By:
Asif Rasheed BS(Hons) Physics
Contact# 0344-7846394,0323-7690026
2
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8/2/2019 Paper of 12 to 17 Short_1
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TEST OF 2ndYEAR PHYSICS CHAPTER# 12TO17 SHORT+PROB
Prepared By:
Asif Rasheed BS(Hons) Physics
Contact# 0344-7846394,0323-7690026
3