PHYSICS TEST 5 - PAK ARMED FORCES TEST

QUIZ START

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QUIZ START

#1. Dimension of torque is

ML T^-2

ML^2 T^-1

ML^2 T^-2

ML^-2 T^2

#2. Unit of solid angle is

radian

degree

steradian

revolution

#3. For assessment of total uncertainty in case of division

absolute uncertainty are added

absolute uncertainty are subtracted

percentage uncertainties are added

percentage uncertainties are subtracted

#4. To decrease timing uncertainty

increase number of vibration

decrease number of vibration

increase length of pendulum

decrease length of pendulum

#5. Correction factor can be applied to

personal error

systematic error

random error

all

#6. Light year is a unit of

distance

speed

acceleration

intensity

#7. In addition and subtraction

percentage uncertainties are added

percentage uncertainties are subtracted

absolute uncertainties are added

absolute uncertainties are subtracted

#8. The product of force and time of impact force is called

momentum

impulsive force

impulse

rate of change of momentum

#9. The maximum height attained by the projectile is

V_i^2 / g Sin^2 θ

V_i^2 / 2g Sin^2 θ

V_i^2 / 2g Sin 2θ

None

#10. For a freely falling elevator

a = W

a = T

a = 0

a = g

#11. For a freely falling elevator, everything in it

will have maximum weight

will have minimum weight

will be weightless

none of these

#12. If an elevator is moving downward with an acceleration a, the apparent weight ‘T’ of an object of real weight ‘W’ will be

R = W + ma

T = W - ma

T = W

T = mg

#13. The base of equation of continuity is on the

First Law of motion

Law of conservation of mass

Law of conservation of charge

Law of conservation of momentum

#14. The speed at which light travels within the material depends upon

Refractive index of medium

Wavelength

Frequency

Intensity

#15. The speed of light in vacuum or in air is

3 * 10^10 m/s

3 * 10^8 m/s

3 * 10^6 m/s

3 * 10^7 m/s

#16. Michelson used the equation to find the speed of light is

C = 18 / fd

B. 16f / d

C = 16 fd

D. C = fd / 18

#17. The final image obtained by astronomical telescope is

Inverted w.r.t. object

Magnified

Virtual

All of them

#18. The magnifying power of an instrument is expressed in

Radians

Degrees

No units

None of these

#19. The displacement of particle executing simple harmonic motion at any instant t is x = 3 cos 2 π t. the acceleration produced in the particle will be

-12 π^2 sin 2 π t

-12 π^2 cos 2 π t

12 π^2 cos 2 π t

all of these

#20. A block of 4 kg produces an extension of 0.16 m in a spring. The block is replaced by a body of mass 0.5 kg. If the spring is stretched and then released the time period of motion will be

28.3 s

2.83 s

0.283 s

0.0283 s

#21. The kinetic energy of a harmonic oscillator is K = K_0 cos^2 ωt. The maximum potential energy of the particle is

Zero

K_0 / 2

K_0

#22. The magnitude of the force producing an acceleration of 10 m/sec^2 in a body of mass 500 gms in Newton is

#23. The time period of the second’s hand of watch is

15 s

1 min

5 h

10 h

#24. Which of the given elements is a diamagnetic material?

antimony

bismuth

copper

all of these

#25. Yttrium barium copper oxide (YBa_2Cu_3O_7) becomes superconductor at

163 K

-110°C

Both a and b

None of these

#26. Steel is more elastic than rubber because

it is a metal

its density is higher

ratio of stress to strain is more

ratio of stress to strain is less

#27. The efficiency of Carnot engine depend upon

Sink temperature

Source temperature

Both a and b

No one

#28. An engine which converts heat energy into useful work upto 35% to 40% is

Petrol engine

Diesel engine

Heat engine

Carnot engine

#29. A device which convert heat energy into mechanical energy is called

Heat engine

Peltier engine

Carnot engine

All of above

#30. An ideal heat engine has 100% efficiency y only if its exhaust temperature is

Less than input temperature

Equal to input temperature

Greater than input temperature

0 K

#31. A system in which there is no transfer of mass across the boundary is called

An isolated system

A closed system

An open system

None of these

#32. A device which convert A.C into D.C is called

converter

rectifier

oscillator

transistor

#33. P-type semi conductor is electrically

positive charged

negatively charged

neutral

no one

#34. What is the minimum distance between an object and its real image in a convex lens?

#35. The process of obtaining D.C from A.C using diode value is called

Rectification

Amplification

Modulation

Detection

#36. Thermocouple is an arrangement of two different metals

To convert heat energy into electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electric energy into heat energy

#37. A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

four times

doubled

halved

one fourth

#38. In case of a motor, if V is the applied emf and ε is the back emf then net emf in the circuit is

V - ε

V + ε

V * ε

ε / V

#39. Lenz’s law is consequence of law of conservation of

Energy

Charge

Induced e.m.f

Induced current

#40. When is the armature current in DC motor maximum?

When the motor has just started

When the motor has been just switched off

When the motor has intermediated speed

When the motor has picked up maximum speed

#41. A surface has work function 3.3 eV. Which of the following cause emission?

100 W incandescent lamp

40 W fluorescent lamp

20 W sodium lamp

20 W Mercury lamp

#42. Find the maximum potential a Cu ball (isolated) can have when irradiated with a wavelength λ = 140 nm [ϕ_Cu = 4.47 eV]

4.47 V

8.86 V

13.33 V

4.39 V

#43. An α particle of mass 6.65 * 10^-27 kg travels at right angles to a magnetic field of 0.2T with a speed of 6 * 10^5 m/s. The acceleration of α-particles will be

7.55 * 10^11 ms^-2

5.77 * 10^11 ms^-2

7.55 * 10^12 ms^-2

5.77 * 10^12 ms^-2

#44. What voltage is needed to balance an oil drop carrying 5 electron when located the plates of a capacitor 5 mm apart? The mass of drop is 3.12 * 10^-14 kg

15.5 V

17.2 V

19.1 V

21.7 V

#45. The binding energy per nucleon is maximum in the case of

He^4

Fe^56

Ba^141

U^235

#46. A radioactive element has half-life period 1600 years. After 6400 years what amount will remain?

1/2

1/16

1/8

1/4

#47. The element used for radioactive Carbon dating for more than 5600 years

C-14

U-234

U-238

Po-94

#48. Pair production can take place only with

X-rays

Heat radiation's

γ-Rays

Ultra violet rays

#49. Work done by centripetal force is

Zero

Maximum

Positive

Negative

#50. Identify the INCORRECT statement: A planet is observed by an astronomical telescope having objective of focal length 16 m and eye-piece of focal length 2 cm. Then

the distance between the objective and eye-piece is 16.02 cm

the angular magnification of the planet is -800

the image of the planet is inverted

the objective is larger than the eye-piece

Finish

Results

#1. Dimension of torque is

#2. Unit of solid angle is

#3. For assessment of total uncertainty in case of division

#4. To decrease timing uncertainty

#5. Correction factor can be applied to

#6. Light year is a unit of

#7. In addition and subtraction

#8. The product of force and time of impact force is called

#9. The maximum height attained by the projectile is

#10. For a freely falling elevator

#11. For a freely falling elevator, everything in it

#12. If an elevator is moving downward with an acceleration a, the apparent weight ‘T’ of an object of real weight ‘W’ will be

#13. The base of equation of continuity is on the

#14. The speed at which light travels within the material depends upon

#15. The speed of light in vacuum or in air is

#16. Michelson used the equation to find the speed of light is

#17. The final image obtained by astronomical telescope is

#18. The magnifying power of an instrument is expressed in

#19. The displacement of particle executing simple harmonic motion at any instant t is x = 3 cos 2 π t. the acceleration produced in the particle will be

#20. A block of 4 kg produces an extension of 0.16 m in a spring. The block is replaced by a body of mass 0.5 kg. If the spring is stretched and then released the time period of motion will be

#21. The kinetic energy of a harmonic oscillator is K = K_0 cos^2 ωt. The maximum potential energy of the particle is

#22. The magnitude of the force producing an acceleration of 10 m/sec^2 in a body of mass 500 gms in Newton is

#23. The time period of the second’s hand of watch is

#24. Which of the given elements is a diamagnetic material?

#25. Yttrium barium copper oxide (YBa_2Cu_3O_7) becomes superconductor at

#26. Steel is more elastic than rubber because

#27. The efficiency of Carnot engine depend upon

#28. An engine which converts heat energy into useful work upto 35% to 40% is

#29. A device which convert heat energy into mechanical energy is called

#30. An ideal heat engine has 100% efficiency y only if its exhaust temperature is

#31. A system in which there is no transfer of mass across the boundary is called

#32. A device which convert A.C into D.C is called

#33. P-type semi conductor is electrically

#34. What is the minimum distance between an object and its real image in a convex lens?

#35. The process of obtaining D.C from A.C using diode value is called

#36. Thermocouple is an arrangement of two different metals

#37. A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

#38. In case of a motor, if V is the applied emf and ε is the back emf then net emf in the circuit is

#39. Lenz’s law is consequence of law of conservation of

#40. When is the armature current in DC motor maximum?

#41. A surface has work function 3.3 eV. Which of the following cause emission?

#42. Find the maximum potential a Cu ball (isolated) can have when irradiated with a wavelength λ = 140 nm [ϕ_Cu = 4.47 eV]

#43. An α particle of mass 6.65 * 10^-27 kg travels at right angles to a magnetic field of 0.2T with a speed of 6 * 10^5 m/s. The acceleration of α-particles will be

#44. What voltage is needed to balance an oil drop carrying 5 electron when located the plates of a capacitor 5 mm apart? The mass of drop is 3.12 * 10^-14 kg

#45. The binding energy per nucleon is maximum in the case of

#46. A radioactive element has half-life period 1600 years. After 6400 years what amount will remain?

#47. The element used for radioactive Carbon dating for more than 5600 years

#48. Pair production can take place only with

#49. Work done by centripetal force is

#50. Identify the INCORRECT statement: A planet is observed by an astronomical telescope having objective of focal length 16 m and eye-piece of focal length 2 cm. Then

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