10 PHYSICSMultiple Choice Questions

1

Q.1: Four possible answers are given for each question. Encircle the correct option.

1) One byte is equal toa. 4 bits b. 6 bits c. 8 bits d. 10 bits2) To diagnose the brain tumor, it is useda. Iodine – 131 b. Phosphorous – 32 c. Cobalt – 60 d. Carbon – 143) In C.R.O the potential of grid isa. Positive b. Zero c. Neutral d. Negative4) The intensity level of rusting of leaves isa. 10 dB b. 20 dB c. 40 dB d. 30 dB5) The change in the focal length of the eye lens is calleda. Modification b. Induction c. Accommodation d. Distinct vision6) The formula of e.m.f is

a.J

EQ

= b.W

FI

= c.W

EQ

= d.Q

EI

=

7) The principal of working of transformer isa. Self- induction b. Electromagnetism c. Mutual induction d. Electrostatics8) In computer terminology, the term machinery refers toa. Software b. Hardware c. Data d. Procedure9) The main categories of waves area. 1 b. 2 c. 3 d. 410) Transformer is used to change the value ofa. Charge b. Energy c. Power d. Voltage11) The unit of capacitance isa. Ampere b. Farad c. Coulomb d. Volt12) The unit of sound intensity isa. Wm b. Wm-1

c. Wm2d. Wm-2

13) Which of the following characteristics of the wave is independent of the othera. Speed b. Frequency c. Amplitude d. Wavelength14) For a normal person, audible frequency range of the sound wave lies betweena. 10 Hz to 10 kHz b. 20 Hz to 20 kHz c. 25 Hz to 25 kHz d. 30 Hz to 30 kHz15) Which form of energy is sounda. Electrical b. Mechanical c. Thermal d. Chemical16) The index of refraction depends ona. Focal length b. The Speed of light c. The image distance d. The object distance17) Capacitance is defined asa. � �

b.�

�

c. � �d.

�

�

18) An electric current in conductor is due to the flow ofa. Positive ion b. Negative ion c. Positive charges d. Free electron19) What is the direction of the magnetic field lines inside a bar magneta. From north pole to

south poleb. From south pole to

north polec. From side to side d. There are no magnetic

field lines20) The direction of induced emf. in circuit is in accordance with conservation ofa. Mass b. Charge c. Momentum d. Energy21) The particles emitted from hot cathode surface area. Positive ions b. Negative ions c. Protons d. Electrons22) In computer terminology information meansa. Any data b. Raw data c. Processed data d. Large data

10 PHYSICSMultiple Choice Questions

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23) The brain of any computer system isa. Monitor b. Memory c. C.P.U d. Control unit24) When uranium (92 protons) ejects a beta particle how many proton will be in the remaining nucleusa. 89 b. 90 c. 91 d. 9325) E-mail is abbreviation ofa. Emergency mail b. Electronic mail c. Urgent mail d. None of these26) In which process sun gains energya. Nuclear fission b. Nuclear fusion c. Burning of gases d. Chemical reaction27) The equation of NOT operation isa. � = � . � b. � = � + � c. � = � − � d. � = � ̅

28) Frequency is equal to

a. � =�

�b. � =

�

�c. � =2� �

�

�

d. � = � �

29) The refractive index of ice isa. 1.00 b. 1.33 c. 1.31 d. 2.4230) The unit of electric intensity isa. Watt b. � � � � c. � � � � d. � �31) Transformer is used fora. Increase voltage b. Increase resistance c. Both ‘a’ & ‘b’ d. None of these32) One megabyte is equal toa. 1024 KB b. 1034 KB c. 1044 KB d. 1054 kB33) The spring’s constant is

a. � = −��

b. � = � � c. � = � � d. � = −��

34) Mathematical form of current is

a. � =�

�b. � =

�

�

c. � = � � d. � = � �

35) The electroscope is an instrument which is used fora. Detecting charge b. Detecting current c. Detecting radiations d. None of these36) The speed of sound in air at 0oC isa. 317 � � � � b. 386 � � � � c. 346 � � � � d. 331 � � � �

37) If mass of the bob of a pendulum is increased by a factor of 3 the period of the pendulum motion will bea. Increased by factor of

2b. Remain same c. Decreased by factor

of 2d. Decreased by a factor

of 438) Example of mechanical waves isa. Radio waves b. X-rays c. Light waves d. Sound waves39) The characteristics of sound by which we can distinguish between two sounds of same loudness and pitch is

calleda. Intensity b. Quality c. Loudness d. Pitch40) The focal length ( � ) is related to radius of curvature (� ) asa. � = 2�

b. � =�

�c. � =

�

�

d. � � = 2

41) In series combination of capacitors each capacitor will have samea. Voltage b. Charge c. Capacitance d. Charge and voltage42) A lamp connected to a 12V source, when it carries 2.5A current, power will bea. 4.8W b. 14.5W c. 30W d. 60W43) The step down transformera. Decrease the input

currentb. Decrease the input

voltagec. Has more turns in

secondary coild. Has lees turns in

primary coil44) If � = � . � then � is ‘1’ when

10 PHYSICSMultiple Choice Questions

3

a. � = 1, � = 1 b. � = 0, � = 0 c. � = 0, � = 1 d. � = 1, � = 045) Example of primary memory isa. Read only memory b. Hard disk c. Floppy disk d. Audio Cassete46) One of isotope of Uranium is �� �

� � � . The number of neutron in this isotopes isa. 92 b. 146 c. 238 d. 33047) Five joules of work is needed to shift 10C of charge from one place to another the potential difference

between the places isa. 0.5V b. 2V c. 5V d. 10V48) What happens to the intensity or the brightness of lamps connected in series as more and more lamps are

addeda. Increases b. Decreases c. Remains the same d. Cannot be predicted49) Which is example of longitudinal wavea. Sound wave b. Light wave c. Radio wave d. Water wave50) The presence of magnetic field can be detected by aa. Small mass b. Stationary positive

chargec. Stationary negative

charged. Magnetic compass

51) In vacuum all electromagnetic waves have the samea. Speed b. Frequency c. Amplitude d. Wavelength52) Safe limit of radiations exposure in one year isa. 4 rem b. 5 rem c. 3 rem d. 6 rem53) The relation between velocity, frequency and wavelength of a wave isa. � � = � b. � � = � c. � � = �

d. � =�

�54) From which of the following you can get information almost about everythinga. Book b. Teacher c. Computer d. Internet55) The cathode ray oscilloscope consists of ___ main partsa. Two b. Three c. Four d. Five56) Which one of the following is a method of energy transfera. Conduction b. Radiation c. Wave motion d. All of these57) The formula for time period of mass spring system is

a. � =2� ��

�b. � =2� �

�

�c. � =2� �

�

�d. � =2� �

�

�

58) The formula for focal length is

a. � =�

�b. � =

�

�c. � =

�

�d. � =

�

�59) S.I unit of resistance isa. Volt b. Ampere c. Ohm d. Joule60) Michal Faraday belonged toa. British b. U.S.A c. K.S.A d. Russia61) The process by which electrons are emitted by a hot metal surface is known asa. Boiling b. Evaporation c. Conduction d. Thermionic emission62) Radio waves area. Longitudinal waves b. Transverse waves c. Electromagnetic

wavesd. All of these

63) 1 KB = _______a. 1024 Bite b. 1024 KB c. 1024 MB d. None of these64) Half life of carbon – 14 in years isa. 5730 years b. 5740 years c. 5750 years d. 5760 years65) The output of NAND gate is 0 whena. � = 0, � = 0 b. � = 1, � = 1 c. � = 0, � = 1 d. � = 1, � = 0

10 PHYSICSMultiple Choice Questions

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66) One mega byte has _____ kilobytes.a. 1024 b. 1014 c. 1004 d. 103467) A device which is used to increase the alternating voltage is calleda. Motor b. Generator c. Step up transformer d. Step down

transformer68) Which among the following radiation has more penetrating powera. A beta particle b. A gamma rays c. An alpha particles d. All have the same69) The unit of electric power isa. Volt b. Joule c. Ampere d. Watt70) Image formed by a camera isa. Real, inverted and

diminishedb. Virtual, upright and

diminishedc. Virtual, upright and

magnifiedd. Real, inverted and

magnified71) The sound level of whisper isa. 30 dB b. 10 dB c. 40 dB d. 70 dB72) The number of waves passing through a point in one second is calleda. Frequency b. Wavelength c. Displacement d. Amplitude73) A positive electric chargea. Attracts other positive

chargeb. Repels other positive

chargec. Attracts a neutral

charged. Repels a neutral

charge74) Waves transfera. Energy b. Frequency c. Wavelength d. Velocity75) an electric current in conductor is due to flow ofa. positive ions b. negative ions c. positive charges d. free electrons76) the turn ratio of transformer is 10, it meansa. � � = 10 � �

b. � � =� �

� �

c. � � = 10 � �d. � � =

� �

� �77) The particle emitted from a hot cathode surface area. Positive ions b. Negative ions c. Protons d. Electrons78) Release of energy by the sun isa. Nuclear fission b. Nuclear fusion c. Burning of gases d. Chemical reaction79) One micro ampere is equal toa. 10 � � � b. 10 � � � c. 10 � � d. 10 � � �

80) Radio waves area. Mechanical b. Electromagnetic c. Sound waves d. All of these81) Half-life of hydrogen isa. 12.3 years b. 5730 years c. 30 years d. 2.85 years82) One nano farad is equal toa. 1 × 10 � � � b. 1 × 10 � � � c. 1 × 10 � � � � d. 1 × 10 � � � �83) Formula for finding the speed of sound isa. � = � � b. � = � �

c. � =�

�d. � =

�

�84) Capacitors storesa. Current b. Charge c. Resistance d. All of these85) Transformer is used toa. Increase the voltage b. Decrease the voltage c. Both ‘a’ & ‘b’ d. None of these86) Particles of the nucleus of an atom area. Protons and electrons b. Protons c. Protons and neutrons d. Electrons and

neutrons

10 PHYSICSShort Question

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CHAPTER 10

1) Define longitudinal waves.2) What do you mean by amplitude?3) Define simple pendulum and write the formula of its time period.4) Write two characteristics of simple harmonic motion.5) Define refraction of waves6) Define transverse waves.7) Define mechanical waves and give an example.8) State Hook’s law.9) With respect to simple pendulum, what is difference between vibration and amplitude?10) Define transverse waves and longitudinal waves.11) Define the diffraction of waves.12) Define spring constant and write its formula.13) What is meant by damped oscillations?14) What is difference between mechanical waves and electromagnetic waves?15) If the length of simple pendulum is doubled. What will be the change in its time period?

CHAPTER 11

1) Write two uses of ultra sound.2) Define pitch.3) Define the intensity of sound.4) Calculate the frequency of sound wave of speed 340� � � � and wavelength0.5� .5) Name the two characteristics of sound.6) Differentiate between frequency and pitch.7) Define quality of sound.8) What is meant by echo of sound?9) What is meant by “Sonar”?10) What is meant by loudness of sound?11) What is stethoscope?12) What is meant by audible frequency range?13) What is reflection of sound?14) Define intensity of sound and write the name of its unit.15) What is difference between noise and musical sound?16) What are audible frequency ranges for young children and old people?17) Describe the factors on which a safe level of sound depends18) What is meant by soundless whistle?19) What is meant by decibel scale20) What is meant by ultrasound21) What is meant by reflection of sound?22) What is meant by sound level?23) Why ultrasound is useful in medical field?

CHAPTER 12

1) State laws of refraction.

2) Define systoscope and gastroscope.

3) Define nearsightedness.

10 PHYSICSShort Question

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4) State laws of reflection.

5) What is difference between concave and convex lens.

6) Define critical angle.

7) What is difference between convex mirror and concave mirror?

8) Write medical use of light pipe.

9) What is meant by power of lenses? What is its unit?

10) Define spherical mirrors.

11) Define pole of a mirror.

12) What is endoscope?

13) Define refraction of light.

14) What are the applications of lenses?

15) Define the simple microscope.

16) Define total internal reflection.

17) What is prism?

18) Define refractive index. What is its unit?

19) What is difference between regular and irregular reflection.

20) Define Snell’s law. Write down its formula.

21) Describe the types of reflection of light.

22) Define compound microscope.

23) Define critical angle.

24) What is meant by optical fiber?

25) What is difference between real and virtual image?

26) What is meant by farsightedness?

27) Define magnifying power.

28) Write names of two kinds of endoscope.

29) Under what conditions will a converging lens form a virtual image?

30) Define Principal focus.

CHAPTER 13

1) Explain any application of electrostatics.

2) Explain the variable capacitor with an example.

3) Define the unit of electric field intensity.4) Write any two characteristics of electric field lines.5) What is difference between variable capacitor and fixed capacitor?6) Write two uses of capacitor.7) What is meant by ohmic and non-ohmic conductors?8) Define Farad.9) What is mica capacitor?10) What is electrostatic air cleaner?11) Write the formula of parallel combination of capacitor.12) What is difference between capacitor and dielectric?13) Connect three capacitors in series and draw their circuit diagram.14) For what purpose electroscope is used?

10 PHYSICSShort Question

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15) What is meant by electroscope?16) Define charge.

CHAPTER 14

1) Define unit of current.

2) Define Ohm. Write its symbol

3) If the length of copper wire is 1m and its diameter is 2 mm. find its resistance4) What is meant by electromotive force?5) State joule’s law. Write down its formula.6) What is difference between a cell and battery?7) What is meant by earth wire?8) Define ampere.9) What is electric current? Write its formula to calculate it.10) What is thermistor? Write its one use.11) Differentiate between direct current and alternating current.12) What is S.I unit of electric power? Define it.13) If 0.5C charge passes through wire in 10s then what will be the value of current flowing through the wire.14) Which devices are used to measure the current? Write names.15) Which are the sources of emf? Write names.16) Write two advantages of parallel circuit.17) What is the function of voltmeter and ammeter?18) Prove that � = � � � .19) What is difference between live wire and neutral wire?20) What is difference between D.C and A.C?21) Define electric field intensity and write its unit.22) Define resistance and give the name of unit.23) Define potential difference and write the name of unit.24) Define resistivity and write its formula.25) Define electric field lines. Who introduced them?26) How emf of a battery measure?27) Define current. What is its SI unit?28) What is difference between electric power and kilowatt hour?29) Write down two advantages of parallel circuit over series circuit.30) Write the use of relay.31) Define unit of power.32) Define A.C generator.

CHAPTER 15

1) State right hand rule for straight conductor.

2) Write two ways to increase the magnetic force.

3) Write two factors affecting induced emf.4) Define electromagnet.5) State Lenz’s law.6) Which device is used for converting electrical energy into mechanical energy and at what principle it

works?7) What is meant by mutual induction?8) Write any two factors on which magnitude of induced emf depends on.9) Which is the principal of finding the direction of magnetic field? State it.

10 PHYSICSShort Question

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10) What is meant by intensity of magnetic field?11) Define electromagnet.12) Define electromagnetic induction.13) State the rule by which the direction of the line of force of the magnetic field around a current carrying

conductor can be determined14) What do you mean by step up and step down transformer?15) How many coils are used in a transformer? Also name them.16) Define A.C generator.17) Define mutual induction.18) What is meant by transformer? Write its principle.19) What is relay?

CHAPTER 16

1) Define electronics.2) Define thermionic emission3) Differentiate between digital and analogue quantities.4) Construct truth table and symbol of AND gate.5) Define digital electronics6) Write the parts of cathode ray oscilloscope.7) What is meant by fluorescent screen?8) Describe the role of deflecting plates in cathode ray oscilloscope.9) What do you mean by NOT gate? How does it work?10) For what purpose electron gun is used in cathode ray oscilloscope.11) Give truth tale of NOR operation.12) Define truth table.13) Define OR gate. Write its truth table.14) Draw the circuit diagram of AND operation.15) What is meant by analogue electronics?16) How does the LDR work?

CHAPTER 17

1) What do you mean by software?2) What is meant by fax machine?3) Define information and communication technology.4) Differentiate between RAM. and ROM.5) Write two advantages of e-mail.6) Define data.7) What is global web?8) What is flash drive?9) What is hard disc?10) What is meant by D.A.C.?11) Define word processing.12) What is meant by compact disc?13) Define operating system and give an example.14) How a fax machine works?15) Write name of four output devices of a computer.16) Define telecommunication17) What is Data Management?18) What do you mean by information technology?19) Write two uses of computer.

10 PHYSICSShort Question

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20) Define data and information.21) Define computer.22) Write down two uses of internet.23) What is difference between software and hardware?24) What do you know about cell phone?25) What is floppy disc?26) What is meant by radio waves?27) What is photo phone?

CHAPTER 18

1) Define half-life.2) Define radioactive isotopes.3) What do you mean by carbon dating?4) Define fission reaction.5) Write two uses of radio-isotopes.6) What is neutron number?7) Write two common hazards of radiation.8) Write two characteristics of beta radiation.9) How fission chain reaction is controlled?10) Describe two safety precautions to avoid hazards of radiations.11) Define isotopes.12) Define penetrating power.13) Write the chemical equation for nuclear fusion.14) Define atomic mass number and write its formula.15) Define penetrating ability.16) Define nuclear transmutation.17) Write any two uses of radio isotopes.18) Define nuclear fusion. Write its equation.19) Write down properties of gamma radiations.20) Define atomic number. Write its symbol.21) Define atom and write its basic particles.22) Write two properties of alpha particles.23) What is difference between atomic number and atomic mass number24) What is meant by background radiations?

10 PHYSICSLong Question

1

CHAPTER 10

1) How can you define the term wave motion? Also elaborate the difference between mechanical waves andelectromagnetic waves with suitable example.

2) What are damped oscillations? Explain it.3) Define Simple Harmonic motion and prove that motion of ball in bowl system is simple harmonic motion.4) Define Simple Harmonic motion and prove that motion of mass attached with spring have simple harmonic

motion.5) Derive an equation of relation between speed, frequency and wavelength.6) A simple pendulum completes one vibration in 2� Calculate its length when � = 10� � � � .7) Write a note on waves as a carrier of energy.8) Explain waves as carrier of energy and prove that � = � �9) Define simple harmonic motion and prove that motion of a simple pendulum is simple harmonic motion.

CHAPTER 11

1) Write a note on characteristics of sound.2) A sound wave has a frequency of 2� � � and wavelength is35� � . How long will it take to travel1.5� � ?3) A marine ship sends a sound wave straight to sea bed it receives an echo 1.5s later. The speed of sound in

sea water is1500� � � � . Find the depth of the sea at this position.4) Calculate the frequency of a sound wave of speed 340� � � � and wavelength0.5� .5) What is ultra sound? What are its benefits?6) If at Anarkali bazar Lahore, the sound level is 80� � .What will be the intensity level of sound there.

CHAPTER 12

1) An object and its image in a concave mirror are of the same height, yet inverted when the object is 20 cm

from the mirror. What is the focal length of mirror?

2) An object 30 cm tall is located 10.5 cm from a concave mirror with focal length 16 cm.

3) What are optical fibers? Discuss how total internal reflection is used in light propagation through optical

fibers.

4) The power of convex lens is 5D. At what distance the object should be placed from the lens so that its real

and two times larger image is formed.

5) Describe the defects of vision.

6) A convex lens of focal length is 6 cm is to be used to form a virtual image three times the size of object,

where must the lens be placed?

7) Draw ray diagram to show the formation of image in the normal human eye.

8) What do you understand by reflection of light? Draw a diagram to illustrate reflection at a plane surface.

9) Find the critical angle for water. If the refracted angle is 90o the refractive index of water is 1.33 and that of

air is 1.

10) A concave lens has a focal length of 15 cm. At what distance should the object from the lens be placed so

that it forms an image at 10 cm from the lens? Also find the magnification of lens.

11) Find the focal length of mirror that forms an image 5.66 cm behind a mirror of an object placed at 34.4 cm

in front of the mirror.

10 PHYSICSLong Question

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CHAPTER 13

1) A capacitor holds 0.03 coulombs of charge when fully charges by a 6 volt battery. How much voltage would

be required for it to hold 2 coulombs of charge

2) Two capacitors of 12� � and 6� � are connected in parallel with a 12V battery. Find the equivalentcapacitance of the combination. Find the charge and the potential difference across each capacitor.

3) The potential at a point in an electric field is10� � . If a charge of +100� � is brought from infinity to thispoint. What would be the amount of work done on it?

4) Three capacitors with capacitance of 3� � , 4 � � and 5� � are connected in series combination to a battery of6V battery. Find the equivalent capacitance of the combination.

5) State and explain Coulomb’s law.6) Two bodies are oppositely charged with 500� � and 100� � find the force between the two charges if the

distance between them in air is 0.5m.7) A point charge of +2� is transferred from a point at 100� to a point at a potential50� . What would be the

energy supplied by charge.8) Two point charges � � = 10� � and � � = 5� � are placed at a distance of 150 cm. what will be the coulomb’s

force between them?CHAPTER 14

1) Write the characteristics of parallel combination of resistors

2) What are the possible combinations of resistors in a circuit?3) Discuss the main features of parallel combination of resistors and determine the equivalent resistance also.4) Define resistance and its unit.5) The resistance of a conductor wire is10� Ω. If a potential difference of 100V is applied across its ends, then

find the value of current passing through it in � � .6) The resistance of an electric bulb is 500Ω. Find the power consumed by the bulb when a potential

difference of 250V is applied across its ends.7) State Joule’s law and derive an equation for the electrical energy.

CHAPTER 15

1) What is electrical motor? Explain the working principle of DC motor.

2) A step down transformer needed to convert a mains 240V supply into a 12V supply. If there are 2000 turnson the primary coil, then find the number of turns of the secondary coil.

3) A step up transformer has a turn ratio of 1:100. An alternating supply of 20V is connected across theprimary coil. What is secondary voltage?

CHAPTER 16

1) Define NAND Gate, draw its symbol and write its truth table.

2) Draw the circuit diagram of AND operation and OR operation and also write the truth tables of both theseoperations.

3) What is difference between analogue and digital quantities? Write the two examples of each also.4) What is cathode ray oscilloscope? Write its two uses.5) Explain deflection of electrons by electric and magnetic fields.6) What is cathode ray oscilloscope? Write a brief note on its components.7) What is meant by cathode ray oscilloscope? Explain the deflecting plates and fluorescent screen.8) What is meant by thermionic emission? Explain the deflection of electrons by electric field and magnetic

field.CHAPTER 17

10 PHYSICSLong Question

3

1) Differentiate between the primary and secondary memory.

2) What are the risks of ICT to society and environment?3) Define electronic mail. Write down its three advantages.4) What are the components of information technology? Write the function of any three.

CHAPTER 18

1) Coabalt-60 is a radioactive element with half-life of 5.25 years. What fraction of the original sample will be

left after 26 years?

2) The activity of a sample of a radioactive bismuth decreases to one-eighth of its original activity in 15 days.Calculate the half-life of the sample.

3) Write safety measures to save from hazards of radiations.4) Explain briefly the transmission of radio waves in space.5) What is meant by radioisotopes? Describe their uses in medicine and industry6) How radioactive isotopes are used as tracers and in medical treatment.7) Define and explain nuclear fusion reaction.8) Carbon-14 has a half-life of 5730 years. How long will it take for the quantity of carbon-14 in sample to

drop to�

�of the initial quantity?