PHYSICS TEST 6 - PAK ARMED FORCES TEST

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#1. The number of seconds in one year are

3.154 X 10^6

3.154 X 10^5

3.154 X 10^4

3.154 X 10^7

#2. Dimension of G are

[ML^3T^2]

[M^-1L^2T^-2]

[M^-1L^3T^-2]

[M^-1L^3T^2]

#3. Galvanometer is a device used for the deflection and measurement of

Voltage

Current

Temperature

Pressure

#4. SI system is based upon ______ kind of units.

one

two

three

four

#5. Reduce the following figure up to three significant figure: 64.4567

64.5

64.4

64.3

None

#6. Fractional error in a measured quantity is determined by

measured value/ Absolute error

absolute error/ measured value

measured value + absolute error

measured value - absolute error

#7. Dimension of coefficient of viscosity is

[MLT^1]

[L^-1T^-1]

[ML^-1T^-1]

[M^-1L^-1T^-1]

#8. Slope of displacement time graph gives

instantaneous velocity

instantaneous acceleration

work done

force

#9. Range of projectile is maximum when thrown at an angle of

30°

60°

45°

75°

#10. The drag force increases if the speed of the object moving through a fluid

increases

decreases

Remains constant

None of these

#11. When a droplet falls through a medium with terminal velocity, the acceleration is

maximum

minimum

constant

zero

#12. Bernoulli’s equation is the fundamental equation in fluid dynamics that relates pressure to

height of fluid column

fluid speed

both of these

none of these

#13. In deriving Bernoulli’s equation we assume that the fluid is

incompressible

non-viscous

in steady flow

all of these

#14. The distance between the objective and eye-piece of a telescope in normal adjustment is

f_o - f_e

f_o + f_e

2f_e - f_o

None of these

#15. A simple astronomical telescope consists of

Two convex lenses

Three convex and one concave

Two concave lens

None of these

#16. An optical instrument used to see very far off objects is called

Telescope

Camera lens

Microscope

Spectrometer

#17. If focal length of objective is increased

Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

#18. In compound microscope, the focal length of eye piece is

Large

Small

Same as objective

None of these

#19. A particle performs simple harmonic motion. Find its maximum speed if its amplitude is 0.10 m and frequency 5.0 Hz.

9.08 ms^-1

5.50 ms^-1

1.25 ms^-1

3.14 ms^-1

#20. A body performing S.H.M. has a displacement x given by the equation x = 20sin(88t) where t is time in seconds. What is the frequency of oscillation?

6.03 Hz

3.65 Hz

14 Hz

256 Hz

#21. When an atom of helium loses all electrons, then it is called

An alpha particle

A helium ion

A proton

A deuteron

#22. The mass of a particle moving with the velocity of light is

finite

Infinite

Zero

Unity

#23. Pinhole camera was invented by

Al beruni

Yaqoob Ali Kindi

Ibn-Al-Haitham

Al Khwarizmi

#24. The limit below which the Hooke’s law holds well is called

yield point

breaking stress

tensile strength

elastic limit

#25. The atoms or molecules in a crystalline solid are held together by

attractive force

gravitational force

cohesive force

electromagnetic force

#26. Upon applying some unbalanced external stress, the deformation may be observed in

length

surface area

volume

all of these

#27. Lenz’s law is a consequence of the law of conservation of

Mass

Energy

Momentum

Charge

#28. The expression PV^gamma = Constant holds good in

adiabatic process

isothermal processes

isothermal process

None of these

#29. The rate of change of angular momentum of a body is equal to

Impulsive force

Applied force

Moment of Inertia

The applied torque

#30. Identify the correct expression for the molar volume V_m of a gas, where all symbols carry their standard meaning

nRT / P

N_A RT / P

nkT / P

RT / P

#31. Calculate the number of atoms in an ideal gas at S.T.P. (T = 27°C, P = 100 kPa)

5 X 10^22

2 X 10^25

5 X 10^25

5 X 10^26

#32. The electronic circuits which perform various logic operations are called

Series circuits

Parallel circuits

Digital circuits

Logic gates

#33. The output of a two-input OR gate is ‘0’ only when

both inputs are 0

both inputs are 2

either input is 5

either input is 3

#34. The output of a two-input AND gate has output ‘1’ only when

both inputs are 3

both inputs are 1

either input is 2

either input is 6

#35. If an electron is accelerating through a potential difference of 500 volt. The velocity obtained by the electron will be

(2/3) X 10^7 ms^-1

(1/6) X 10^8 ms^-1

(11) X 10^7 ms^-1

none of these

#36. The temperature of hot junction of a thermocouple changes from 80°C to 100°C. Percentage change in thermoelectric power will be

80%

90%

55%

25%

#37. Current provided by a battery is maximum when

Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less than external resistance

None of these

#38. Total number of lines of magnetic induction pass normally through a unit area is called

magnetic field line

Magnetic flux

flux density

self induction

#39. The magnetic flux is also called

Flux

Magnetic intensity

Flux density

self inductance

#40. The induced e.m.f. is produced in a circuit due to

initial magnetic flux through the circuit

Final magnetic flux through the circuit

The change of magnetic flux through the circuit

None of the above

#41. Electrons move at right angles to a magnetic field of 0.03T and enter with a velocity 9 X 10^7 m/s. The value of e/m will be ______ (Given radius of circular path = 1.764 cm)

1.7 X 10^11 Ckg^-1

2 X 10^11 Ckg^-1

2.5 X 10^11 Ckg^-1

none of these

#42. An oil drop with charge ne is held stationary between two plates with an external potential difference of 500 volt. If the size of the drop is doubled without any change of charge, the potential difference required to keep the drop stationary will be

500 V

1000 V

2000 V

4000 V

#43. The momentum of a photon of energy 1 MeV, in kg*m/s, will be

10^-22

0.33 X 10^6

5 X 10^22

7 X 10^-22

#44. The work function of a metal is eV. On making light of wavelength 3000 Å incident on this metal, the velocity of photoelectrons emitted from it for photoelectric emission will be

2955 Å

4200 Å

1100 Å

3000 Å

#45. In Wilson cloud chamber, the beta-particle leave

Straight and continuous tracks

No definite tracks

Thin and continuous tracks

Thin and discontinuous tracks

#46. A Geiger counter counts radioactive particles by

amplifying the sound theory make as theory strike the walls of tube.

emitting detectable light pulses when stuck

collecting and measuring the charges of the particles

under going a chemical reaction with each incident particle.

#47. gamma-rays show ______ in Wilson cloud chamber

thin and discontinuous tracks

irregular cloud tracks

dense straight and continuous tracks

no definite tracks

#48. I^131 used for the remedy of

Skin cancer

Thyroid disabilities

Lungs cancer

none of these

#49. The amount of strain energy stored in a deformed material is expressed as

2El_1 / L

1/2 EAl_1

1/2 [ (EA x l_1^2) / L ]

1/2 [ (EA x l_1) / L^2 ]

#50. Substances which break just after the elastic limit is crossed are called

soft substances

hard substances

brittle substances

ductile substances

Finish

Results

#1. The number of seconds in one year are

#2. Dimension of G are

#3. Galvanometer is a device used for the deflection and measurement of

#4. SI system is based upon ______ kind of units.

#5. Reduce the following figure up to three significant figure: 64.4567

#6. Fractional error in a measured quantity is determined by

#7. Dimension of coefficient of viscosity is

#8. Slope of displacement time graph gives

#9. Range of projectile is maximum when thrown at an angle of

#10. The drag force increases if the speed of the object moving through a fluid

#11. When a droplet falls through a medium with terminal velocity, the acceleration is

#12. Bernoulli’s equation is the fundamental equation in fluid dynamics that relates pressure to

#13. In deriving Bernoulli’s equation we assume that the fluid is

#14. The distance between the objective and eye-piece of a telescope in normal adjustment is

#15. A simple astronomical telescope consists of

#16. An optical instrument used to see very far off objects is called

#17. If focal length of objective is increased

#18. In compound microscope, the focal length of eye piece is

#19. A particle performs simple harmonic motion. Find its maximum speed if its amplitude is 0.10 m and frequency 5.0 Hz.

#20. A body performing S.H.M. has a displacement x given by the equation x = 20sin(88t) where t is time in seconds. What is the frequency of oscillation?

#21. When an atom of helium loses all electrons, then it is called

#22. The mass of a particle moving with the velocity of light is

#23. Pinhole camera was invented by

#24. The limit below which the Hooke’s law holds well is called

#25. The atoms or molecules in a crystalline solid are held together by

#26. Upon applying some unbalanced external stress, the deformation may be observed in

#27. Lenz’s law is a consequence of the law of conservation of

#28. The expression PV^gamma = Constant holds good in

#29. The rate of change of angular momentum of a body is equal to

#30. Identify the correct expression for the molar volume V_m of a gas, where all symbols carry their standard meaning

#31. Calculate the number of atoms in an ideal gas at S.T.P. (T = 27°C, P = 100 kPa)

#32. The electronic circuits which perform various logic operations are called

#33. The output of a two-input OR gate is ‘0’ only when

#34. The output of a two-input AND gate has output ‘1’ only when

#35. If an electron is accelerating through a potential difference of 500 volt. The velocity obtained by the electron will be

#36. The temperature of hot junction of a thermocouple changes from 80°C to 100°C. Percentage change in thermoelectric power will be

#37. Current provided by a battery is maximum when

#38. Total number of lines of magnetic induction pass normally through a unit area is called

#39. The magnetic flux is also called

#40. The induced e.m.f. is produced in a circuit due to

#41. Electrons move at right angles to a magnetic field of 0.03T and enter with a velocity 9 X 10^7 m/s. The value of e/m will be ______ (Given radius of circular path = 1.764 cm)

#42. An oil drop with charge ne is held stationary between two plates with an external potential difference of 500 volt. If the size of the drop is doubled without any change of charge, the potential difference required to keep the drop stationary will be

#43. The momentum of a photon of energy 1 MeV, in kg*m/s, will be

#44. The work function of a metal is eV. On making light of wavelength 3000 Å incident on this metal, the velocity of photoelectrons emitted from it for photoelectric emission will be

#45. In Wilson cloud chamber, the beta-particle leave

#46. A Geiger counter counts radioactive particles by

#47. gamma-rays show ______ in Wilson cloud chamber

#48. I^131 used for the remedy of

#49. The amount of strain energy stored in a deformed material is expressed as

#50. Substances which break just after the elastic limit is crossed are called

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